ICS84330CVILF [IDT]
Clock Generator, 720MHz, PQCC28, 11.60 X 11.40 MM, 4.10 MM HEIGHT, PLASTIC, MS-018, LCC-28;
| 型号： | ICS84330CVILF |
| 厂家： | 
INTEGRATED DEVICE TECHNOLOGY |
| 描述： | Clock Generator, 720MHz, PQCC28, 11.60 X 11.40 MM, 4.10 MM HEIGHT, PLASTIC, MS-018, LCC-28 时钟 外围集成电路 晶体 |
| 文件： | 总20页 (文件大小：821K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
720MHz, Low Jitter, Crystal-to-LVPECL
Frequency Synthesizer
ICS84330CI
DATA SHEET
General Description
Features
The ICS84330CI is a general purpose, single output high frequency
synthesizer. The VCO operates at a frequency range of 250MHz to
720MHz. The VCO and output frequency can be programmed using
the serial or parallel interfaces to the configuration logic. The output
can be configured to divide the VCO frequency by 1, 2, 4, and 8.
Output frequency steps as small as 250kHz to 2MHz can be
achieved using a 16MHz crystal depending on the output divider
settings.
• Fully integrated PLL, no external loop filter requirements
• One differential 3.3V LVPECL output
• Crystal oscillator interface: 10MHz to 25MHz
• Output frequency range: 31.25MHz to 720MHz
• VCO range: 250MHz to 720MHz
• Parallel or serial interface for programming M and N dividers
during power-up
• RMS period jitter: 6ps (maximum)
• Cycle-to-cycle jitter: 40ps (maximum)
• 3.3V supply voltage
• -40°C to 85°C ambient operating temperature
• Available in both standard (RoHS5) and lead-free (RoHS 6)
packages
Pin Assignments
25 24 23 22 21 20 19
26
27
28
1
N1
S_CLOCK
18
17
16
15
N0
M8
M7
M6
S_DATA
S_LOAD
ICS84330CI
28 Lead PLCC
V Package
VCCA
11.6mm x 11.4mm x 4.1mm
FREF_EXT
14
13
2
3
4
package body
Top View
Block Diagram
XTAL_SEL
XTAL1
M5
M4
12
Pullup
OE
5
6
7
8
9
10 11
XTAL1
1
0
OSC
XTAL2
Pulldown
FREF_EXT
÷16
Pullup
XTAL_SEL
32 31 30 29 28 27 26 25
PLL
1
S_CLOCK
nc
24
23
22
21
20
÷2
÷4
÷8
÷1
PHASEDETECTOR
÷M
2
3
4
5
6
7
8
S_DATA
S_LOAD
N1
N0
M8
M7
ICS84330CI
32 Lead LQFP
Y Package
1
0
FOUT
nFOUT
VCO
÷2
VCCA
VCCA
7mm x 7mm x 1.4mm
package body
Top View
FREF_EXT
XTAL_SEL
XTAL1
M6
M5
M4
19
18
17
Pulldown
Pulldown
Pulldown
Pullup
S_LOAD
S_DATA
S_CLOCK
nP_LOAD
CONFIGURATION
INTERFACE
LOGIC
TEST
9
10 11 12 13 14 15 16
Pullup
Pullup
M0:M8
N0:N1
ICS84330CVI REVISION A JANUARY 7, 2011
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©2011 Integrated Device Technology, Inc.
ICS84330CI Data Sheet
720MHZ, CRYSTAL-TO-LVPECL FREQUENCY SYNTHESIZER
Functional Description
NOTE: The functional description that follows describes operation
using a 16MHz crystal. Valid PLL loop divider values for different
crystal or input frequencies are defined in the Input Frequency
Characteristics, Table 6, NOTE 1.
transition of the nP_LOAD input, the data is latched and the M divider
remains loaded until the next LOW transition on nP_LOAD or until a
serial event occurs. The TEST output is Mode 000 (shift register out)
when operating in the parallel input mode. The relationship between
the VCO frequency, the crystal frequency and the M divider is defined
as follows:
The ICS84330CI features a fully integrated PLL and therefore
requires no external components for setting the loop bandwidth. A
quartz crystal is used as the input to the on-chip oscillator. The output
of the oscillator is divided by 16 prior to the phase detector. With a
16MHz crystal, this provides a 1MHz reference frequency. The VCO
of the PLL operates over a range of 250MHz to 720MHz. The output
of the M divider is also applied to the phase detector.
fVCO = fXTAL x 2M
16
The M value and the required values of M0 through M8 are shown in
Table 3B, Programmable VCO Frequency Function Table. Valid M
values for which the PLL will achieve lock are defined as 125 ≤ M ≤
360. The frequency out is defined as follows:
The phase detector and the M divider force the VCO output fre-
quency to be 2M times the reference frequency by adjusting the VCO
control voltage. Note that for some values of M (either too high or too
low), the PLL will not achieve lock. The output of the VCO is scaled
by a divider prior to being sent to each of the LVPECL output buffers.
The divider provides a 50% output duty cycle.
fout = fVCO = fXTAL x 2M
N
16
N
Serial operation occurs when nP_LOAD is HIGH and S_LOAD is
LOW. The shift register is loaded by sampling the S_DATA bits with
the rising edge of S_CLOCK. The contents of the shift register are
loaded into the M divider when S_LOAD transitions from
LOW-to-HIGH. The M divide and N output divide values are latched
on the HIGH-to-LOW transition of S_LOAD. If S_LOAD is held HIGH,
data at the S_DATA input is passed directly to the M divider on each
rising edge of S_CLOCK. The serial mode can be used to program
the M and N bits and test bits T2:T0. The internal registers T2:T0
determine the state of the TEST output as follows in the table below:
The programmable features of the ICS84330CI support two input
modes to program the M divider and N output divider. The two input
operational modes are parallel and serial. Figure 1 shows the timing
diagram for each mode. In parallel mode the nP_LOAD input is LOW.
The data on inputs M0 through M8 and N0 through N1 is passed
directly to the M divider and N output divider. On the LOW-to-HIGH
T2
0
T1
0
T0
0
TEST Output
fOUT
fOUT
fOUT
fOUT
fOUT
fOUT
fOUT
Shift Register Out
0
0
1
HIGH
0
1
0
PLL Reference XTAL ÷16
0
1
1
(VCO ÷ M)/2 (non 50% Duty Cycle M Divider)
fOUT, LVCMOS Output Frequency < 200MHz
LOW
1
0
0
1
0
1
1
1
0
(S_CLOCK ÷ M)/2 (non 50% Duty Cycle M Divider)
fOUT ÷ 4
S_CLOCK ÷ N Divider
fOUT
1
1
1
SERIAL LOADING
S_CLOCK
T2 T1 T0 N1 N0 M8 M7 M6 M5 M4 M3 M2 M1 M0
S_DATA
S_LOAD
t
t
S
H
t
nP_LOAD
S
PARALLEL LOADING
M, N
M0:M8, N0:N1
nP_LOAD
t
t
H
S
nP_LOAD
Time
Figure 1. Parallel & Serial Load Operations
ICS84330CVI REVISION A JANUARY 7, 2011
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©2011 Integrated Device Technology, Inc.
ICS84330CI Data Sheet
720MHZ, CRYSTAL-TO-LVPECL FREQUENCY SYNTHESIZER
Table 1. Pin Descriptions
Name
VCCA
Type
Description
Power
Analog supply pin.
XTAL1, XTAL2
Crystal oscillator interface. XTAL1 is an oscillator input, XTAL2 is an oscillator output.
Selects between the crystal oscillator or FREF_EXT inputs as the PLL reference source.
Selects XTAL inputs when HIGH. Selects FREF_EXT when LOW.
LVCMOS / LVTTL interface levels.
XTAL_SEL
OE
Input
Input
Input
Pullup
Pullup
Pullup
Output enable. LVCMOS / LVTTL interface levels.
Parallel load input. Determines when data present at M8:M0 is loaded into M divider, and
when data present at N1:N0 sets the N output divide value.
LVCMOS / LVTTL interface levels.
nP_LOAD
M0, M1, M2
M3, M4, M5
M6, M7, M8
M divider inputs. Data latched on LOW-to-HIGH transition of nP_LOAD input. LVCMOS /
LVTTL interface levels.
Input
Pullup
Pullup
Determines N output divider value as defined in Table 3C Function Table.
LVCMOS / LVTTL interface levels.
N0, N1
Input
Power
Output
Negative supply pins.
VEE
Test output which is used in the serial mode of operation.
Single-ended LVPECL interface levels.
TEST
VCC
nFOUT, FOUT
nc
Power
Output
Unused
Input
Core supply pins.
Differential output for the synthesizer. 3.3V LVPECL interface levels.
No connect.
FREF_EXT
Pulldown PLL reference input. LVCMOS / LVTTL interface levels.
Clocks the serial data present at S_DATA input into the shift register on the
Pulldown
S_CLOCK
S_DATA
Input
Input
Input
rising edge of S_CLOCK. LVCMOS / LVTTL interface levels.
Shift register serial input. Data sampled on the rising edge of S_CLOCK.
LVCMOS / LVTTL interface levels.
Pulldown
Controls transition of data from shift register into the M divider.
LVCMOS / LVTTL interface levels.
S_LOAD
Pulldown
NOTE: Pullup and Pulldown refer to internal input resistors. See Table 2, Pin Characteristics, for typical values.
Table 2. Pin Characteristics
Symbol
CIN
Parameter
Test Conditions
Minimum
Typical
Maximum
Units
pF
Input Capacitance
Input Pullup Resistor
4
RPULLUP
51
51
kΩ
RPULLDOWN Input Pulldown Resistor
kΩ
ICS84330CVI REVISION A JANUARY 7, 2011
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©2011 Integrated Device Technology, Inc.
ICS84330CI Data Sheet
720MHZ, CRYSTAL-TO-LVPECL FREQUENCY SYNTHESIZER
Function Tables
Table 3A. Parallel and Serial Mode Function Table
Inputs
nP_LOAD
M
N
S_LOAD
S_CLOCK
S_DATA Conditions
X
X
X
X
X
X
Reset. M and N bits are all set HIGH.
Data on M and N inputs passed directly to the M divider and
N output divider. TEST mode 000.
L
↑
Data
Data
X
Data
Data
X
X
L
L
↑
X
X
↑
L
X
Data is latched into input registers and remains loaded until next
LOW transition or until a serial event occurs.
X
Serial input mode. Shift register is loaded with data on S_DATA on
each rising edge of S_CLOCK.
H
H
Data
Data
Contents of the shift register are passed to the M divider and
N output divider.
X
X
H
H
H
X
X
X
X
X
X
↓
L
L
X
↑
Data
X
M divider and N output divider values are latched.
Parallel or serial input do not affect shift registers.
S_DATA passed directly to M divider as it is clocked.
H
Data
NOTE: L = LOW
H = HIGH
X = Don’t care
↑ = Rising edge transition
↓ = Falling edge transition
Table 3B. Programmable VCO Frequency Function Table
256
M8
0
128
M7
0
64
M6
1
32
M5
1
16
M4
1
8
M3
1
4
M2
1
2
M1
0
1
M0
1
VCO Frequency
(MHz)
M Divide
125
126
127
128
•
250
252
254
256
•
0
0
1
1
1
1
1
1
0
0
0
1
1
1
1
1
0
1
0
1
0
0
0
0
0
1
0
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
718
720
359
360
1
0
1
1
0
0
1
1
1
1
0
1
1
0
1
0
0
0
NOTE 1: These M divide values and the resulting frequencies correspond to a crystal frequency of 16MHz.
Table 3C. Programmable Output DividerFunction Table
Inputs
Output Frequency (MHz)
Minimum Maximum
125 360
N1
0
N0
0
N Divider Value
2
4
8
1
0
1
62.5
31.25
250
180
90
1
0
1
1
720
ICS84330CVI REVISION A JANUARY 7, 2011
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©2011 Integrated Device Technology, Inc.
ICS84330CI Data Sheet
720MHZ, CRYSTAL-TO-LVPECL FREQUENCY SYNTHESIZER
Absolute Maximum Ratings
NOTE: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device.
These ratings are stress specifications only. Functional operation of product at these conditions or any conditions beyond
those listed in the DC Characteristics or AC Characteristics is not implied. Exposure to absolute maximum rating conditions for
extended periods may affect product reliability.
Item
Rating
Supply Voltage, VCC
Inputs, VI
4.6V
-0.5V to VCC+ 0.5V
Outputs, IO
Continuous Current
Surge Current
50mA
100mA
Package Thermal Impedance, θJA
28 Lead PLCC
32 Lead LQFP
37.8°C/W (0 lfpm)
47.9°C/W (0 lfpm)
Storage Temperature, TSTG
-65°C to 150°C
DC Electrical Characteristics
Table 4A. Power Supply DC Characteristics, VCC = 3.3V 5%, VEE = 0V, TA = -40°C to 85°C
Symbol
VCC
Parameter
Test Conditions
Minimum
3.135
Typical
3.3
Maximum
3.465
3.465
160
Units
V
Core Supply Voltage
Analog Supply Voltage
Power Supply Current
Analog Supply Current
VCCA
ICC
3.135
3.3
V
mA
mA
ICCA
17
Table 4B. LVCMOS/LVTTL DC Characteristics, VCC = 3.3V 5%, VEE = 0V, TA = -40°C to 85°C
Symbol
VIH
Parameter
Test Conditions
Minimum
Typical
Maximum
VCC + 0.3
0.8
Units
Input High Voltage
Input Low Voltage
2
V
V
VIL
-0.3
M0-M8, N0, N1, OE,
nP_LOAD, XTAL_SEL
VCC = VIN = 3.465V
5
µA
µA
µA
µA
Input
High Current
IIH
S_LOAD, S_CLOCK
FREF_EXT, S_DATA
VCC = VIN = 3.465V
150
M0-M8, N0, n1, OE,
nP_LOAD, XTAL_SEL
VCC = 3.465V, VIN = 0V
VCC = 3.465V, VIN = 0V
-150
-5
Input
Low Current
IIL
S_LOAD, S_CLOCK
FREF_EXT, S_DATA
Table 4C. LVPECL DC Characteristics, VCC = 3.3V 5%, VEE = 0V, TA = -40°C to 85°C
Symbol
VOH
Parameter
Test Conditions
Minimum
VCC -1.4
VCC -2.0
0.6
Typical
Maximum
VCC -0.9
VCC -1.7
1.0
Units
Output High Voltage; NOTE 1
Output Low Voltage; NOTE 1
Peak-to-Peak Output Voltage Swing
V
V
V
VOL
VSWING
NOTE 1: Outputs terminated with 50Ω to VCC -2V.
ICS84330CVI REVISION A JANUARY 7, 2011
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©2011 Integrated Device Technology, Inc.
ICS84330CI Data Sheet
720MHZ, CRYSTAL-TO-LVPECL FREQUENCY SYNTHESIZER
Table 5. Crystal Characteristics
Parameter
Test Conditions
Minimum
Typical
Maximum
Units
Mode of Oscillation
Fundamental
Frequency
10
25
50
7
MHz
Ω
Equivalent Series Resistance (ESR)
Shunt Capacitance
pF
Table 6. Input Frequency Characteristics, VCC = 3V 5%, VEE = 0V, TA = -40°C to 85°C
Symbol Parameter
Test Conditions
Minimum
Typical
Maximum
Units
MHz
MHz
MHz
XTAL; NOTE 1
S_CLOCK
10
25
50
fIN Input Frequency
FREF_EXT; NOTE 2
10
NOTE 1: For the crystal frequency range, the M value must be set to achieve the minimum or maximum VCO frequency range of 250MHz to
720MHz. Using the minimum input frequency of 10MHz, valid values of M are 200 ≤ M ≤ 511. Using the maximum input frequency of 25MHz,
valid values of M are 80 ≤ M ≤ 230.
NOTE 2: Maximum frequency on FREF_EXT is dependent on the internal M counter limitations. See Application Information Section for
recommendations on optimizing the performance using the FREF_EXT input.
AC Electrical Characteristics
Table 7. AC Characteristics, VCC = 3.3V 5%, VEE = 0V, TA = -40°C to 85°C
Symbol
fOUT
Parameter
Test Conditions
Minimum
Typical
Maximum
Units
MHz
ps
Output Frequency
Period Jitter, RMS; NOTE 1. 2
720
6
tjit(per)
fOUT ≥ 43.75MHz
fOUT < 43.75MHz
20% to 80%
40
ps
tjit(cc)
Cycle-to-Cycle Jitter; NOTE 1, 2
50
ps
tR / tF
Output Rise/Fall Time
200
20
20
20
20
20
600
ps
S_DATA to S_CLOCK
ns
tS
Setup Time S_CLOCK to S_LOAD
M, N to nP_LOAD
ns
ns
S_DATA to S_CLOCK
Hold Time
ns
tH
M, N to nP_LOAD
ns
tL
PLL Lock Time
10
55
ms
%
odc
Output Duty Cycle
45
NOTE: Electrical parameters are guaranteed over the specified ambient operating temperature range, which is established when the device is
mounted in a test socket with maintained transverse airflow greater than 500 lfpm. The device will meet specifications after thermal equilibrium
has been reached under these conditions.
See Parameter Measurement Information section.
NOTE: Characterized using 16MHz XTAL.
NOTE 1: This parameter is defined in accordance with JEDEC Standard 65.
NOTE 2: See Applications section.
ICS84330CVI REVISION A JANUARY 7, 2011
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©2011 Integrated Device Technology, Inc.
ICS84330CI Data Sheet
720MHZ, CRYSTAL-TO-LVPECL FREQUENCY SYNTHESIZER
Parameter Measurement Information
2V
VOH
VREF
SCOPE
V
CC,
Qx
VOL
1σ contains 68.26% of all measurements
2σ contains 95.4% of all measurements
V
CCA
3σ contains 99.73% of all measurements
4σ contains 99.99366% of all measurements
6σ contains (100-1.973x10-7)% of all measurements
LVPECL
nQx
Histogram
Reference Point
(Trigger Edge)
Mean Period
(First edge after trigger)
VEE
-1.3V 0.165V
3.3/3.3V LVPECL Output Load AC Test Circuit
Period Jitter
nFOUT
FOUT
nFOUT
FOUT
tPW
➤
➤
tcycle n
tcycle n+1
tPERIOD
➤
➤
tjit(cc) = tcycle n – tcycle n+1
|
|
tPW
1000 Cycles
odc =
x 100%
tPERIOD
Cycle-to-Cycle Jitter
Output Duty Cycle/Pulse Width/Period
nFOUT
80%
tF
80%
VSWING
20%
20%
FOUT
tR
Output Rise/Fall Time
ICS84330CVI REVISION A JANUARY 7, 2011
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©2011 Integrated Device Technology, Inc.
ICS84330CI Data Sheet
720MHZ, CRYSTAL-TO-LVPECL FREQUENCY SYNTHESIZER
Applications Information
Power Supply Filtering Technique
As in any high speed analog circuitry, the power supply pins are
vulnerable to random noise. To achieve optimum jitter performance,
power supply isolation is required. The ICS84330CI provides
separate power supplies to isolate any high switching noise from the
outputs to the internal PLL. VCC and VCCA should be individually
connected to the power supply plane through vias, and 0.01µF
bypass capacitors should be used for each pin. Figure 2 illustrates
this for a generic VCC pin and also shows that VCCA requires that an
additional 10Ω resistor along with a 10µF bypass capacitor be
connected to the VCCA pin.
3.3V
VCC
.01µF
10Ω
VCCA
.01µF
10µF
Figure 2. Power Supply Filtering
Recommendations for Unused Input and Output Pins
Inputs:
Outputs:
LVCMOS Control Pins
TEST Output
All control pins have internal pullups or pulldowns; additional
resistance is not required but can be added for additional protection.
A 1kΩ resistor can be used.
The unused TEST output can be left floating. There should be no
trace attached.
LVPECL Outputs
The unused LVPECL output pair can be left floating. We recommend
that there is no trace attached. Both sides of the differential output
pair should either be left floating or terminated.
50
40
30
20
10
0
Spec Limit
N = 1
200
300
400
500
600
700
Output Frequency (MHz)
Figure 3. Cycle-to-Cycle Jitter vs. fOUT (using a 16MHz crystal)
ICS84330CVI REVISION A JANUARY 7, 2011
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©2011 Integrated Device Technology, Inc.
ICS84330CI Data Sheet
720MHZ, CRYSTAL-TO-LVPECL FREQUENCY SYNTHESIZER
Overdriving the XTAL Interface
The XTAL_IN input can accept a single-ended LVCMOS signal
through an AC coupling capacitor. A general interface diagram is
shown in Figure 4A. The XTAL_OUT pin can be left floating. The
maximum amplitude of the input signal should not exceed 2V and the
input edge rate can be as slow as 10ns. This configuration requires
that the output impedance of the driver (Ro) plus the series
resistance (Rs) equals the transmission line impedance. In addition,
matched termination at the crystal input will attenuate the signal in
half. This can be done in one of two ways. First, R1 and R2 in parallel
should equal the transmission line impedance. For most 50Ω
applications, R1 and R2 can be 100Ω. This can also be
accomplished by removing R1 and making R2 50Ω. By overdriving
the crystal oscillator, the device will be functional, but note, the device
performance is guaranteed by using a quartz crystal.
VCC
XTAL_OUT
R1
100
C1
Rs
Zo = 50 ohms
Ro
XTAL_IN
.1uf
R2
100
Zo = Ro + Rs
LVCMOS Driver
Figure 4A. General Diagram for LVCMOS Driver to XTAL Input Interface
XTAL_OUT
C2
Zo = 50 ohms
XTAL_I N
.1uf
Zo = 50 ohms
R1
50
R2
50
LVPECL Driver
R3
50
Figure 4B. General Diagram for LVPECL Driver to XTAL Input Interface
ICS84330CVI REVISION A JANUARY 7, 2011
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©2011 Integrated Device Technology, Inc.
ICS84330CI Data Sheet
720MHZ, CRYSTAL-TO-LVPECL FREQUENCY SYNTHESIZER
Termination for 3.3V LVPECL Outputs
The clock layout topology shown below is a typical termination for
LVPECL outputs. The two different layouts mentioned are
recommended only as guidelines.
transmission lines. Matched impedance techniques should be used
to maximize operating frequency and minimize signal distortion.
Figures 5A and 5B show two different layouts which are
recommended only as guidelines. Other suitable clock layouts may
exist and it would be recommended that the board designers
simulate to guarantee compatibility across all printed circuit and clock
component process variations.
The differential outputs are low impedance follower outputs that
generate ECL/LVPECL compatible outputs. Therefore, terminating
resistors (DC current path to ground) or current sources must be
used for functionality. These outputs are designed to drive 50Ω
3.3V
R3
125Ω
R4
125Ω
3.3V
3.3V
3.3V
Z
o = 50Ω
3.3V
+
_
Z
o = 50Ω
+
_
Input
LVPECL
Zo = 50Ω
LVPECL
Input
Zo = 50Ω
R1
R2
50Ω
50Ω
R1
84Ω
R2
84Ω
VCC - 2V
1
RTT =
* Zo
RTT
((VOH + VOL) / (VCC – 2)) – 2
Figure 5A. 3.3V LVPECL Output Termination
Figure 5B. 3.3V LVPECL Output Termination
ICS84330CVI REVISION A JANUARY 7, 2011
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©2011 Integrated Device Technology, Inc.
ICS84330CI Data Sheet
720MHZ, CRYSTAL-TO-LVPECL FREQUENCY SYNTHESIZER
Layout Guideline
The schematic of the ICS84330CI layout example used in this layout
guideline is shown in Figure 6A. The ICS84330CI recommended
PCB board layout for this example is shown in Figure 6B. This layout
example is used as a general guideline. The layout in the actual
system will depend on the selected component types, the density of
the components, the density of the traces, and the stack up of the
P.C. board.
C1
X1
C2
SP
SP
16MHz, 18pF
VCC
R7
10
M4
M5
M6
M7
M8
N2
N1
12
13
14
15
16
17
18
4
M4
M5
M6
M7
M8
N0
N1
X_IN
3
VCC=3.3V
XTAL_SEL
2
FREF_EXT
VCCA
VCCA
1
28
27
26
SP = Space (i.e. not intstalled)
S_LOAD
S_DATA
S_CLOCK
C11
0.01u
C16
10u
M[8:0]= 110010000 (400)
N[1:0] =00 (Divide by 2)
U1
ICS84330
C3
VCC
0.1uF
Zo = 50 Ohm
RU0
SP
RU1
SP
RU7
1K
RU8
1K
RU9
SP
RU10
1K
RU11
SP
RU12
1K
Fout = 200 MHz
+
-
C4
0.1u
Zo = 50 Ohm
R2
50
R1
50
RD0
1K
RD1
1K
RD7
SP
RD8
SP
RD9
1K
RD10
SP
RD6
1K
RD12
SP
R3
50
Figure 6A. ICS84330CI Schematic of Recommended Layout
ICS84330CVI REVISION A JANUARY 7, 2011
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©2011 Integrated Device Technology, Inc.
ICS84330CI Data Sheet
720MHZ, CRYSTAL-TO-LVPECL FREQUENCY SYNTHESIZER
The following component footprints are used in this layout example:
All the resistors and capacitors are size 0603.
• The differential 50Ω output traces should have the same
length.
• Avoid sharp angles on the clock trace. Sharp angle turns
cause the characteristic impedance to change on the
transmission lines.
Power and Grounding
Place the decoupling capacitors C3 and C4, as close as possible to
the power pins. If space allows, placement of the decoupling
capacitor on the component side is preferred. This can reduce
unwanted inductance between the decoupling capacitor and the
power pin caused by the via.
• Keep the clock traces on the same layer. Whenever possible,
avoid placing vias on the clock traces. Placement of vias on the
traces can affect the trace characteristic impedance and hence
degrade signal integrity.
Maximize the power and ground pad sizes and number of vias
capacitors. This can reduce the inductance between the power and
ground planes and the component power and ground pins.
• To prevent cross talk, avoid routing other signal traces in
parallel with the clock traces. If running parallel traces is
unavoidable, allow a separation of at least three trace widths
between the differential clock trace and the other signal trace.
The RC filter consisting of R7, C11, and C16 should be placed as
close to the VCCA pin as possible.
• Make sure no other signal traces are routed between the clock
trace pair.
Clock Traces and Termination
Poor signal integrity can degrade the system performance or cause
system failure. In synchronous high-speed digital systems, the clock
signal is less tolerant to poor signal integrity than other signals. Any
ringing on the rising or falling edge or excessive ring back can cause
system failure. The shape of the trace and the trace delay might be
restricted by the available space on the board and the component
location. While routing the traces, the clock signal traces should be
routed first and should be locked prior to routing other signal traces.
• The matching termination resistors should be located as close
to the receiver input pins as possible.
Crystal
The crystal X1 should be located as close as possible to the pins 4
(XTAL1) and 5 (XTAL2). The trace length between the X1 and U1
should be kept to a minimum to avoid unwanted parasitic inductance
and capacitance. Other signal traces should not be routed near the
crystal traces.
X1
C1
C2
U1
GND
VCC
PIN 2
PIN 1
C16
C11
R7
VCCA
VIA
VCCA
Signals
Traces
C3
C4
50 Ohm
Traces
Figure 6B. ICS84330CI PCB Board Layout for ICS84330CI
ICS84330CVI REVISION A JANUARY 7, 2011
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©2011 Integrated Device Technology, Inc.
ICS84330CI Data Sheet
720MHZ, CRYSTAL-TO-LVPECL FREQUENCY SYNTHESIZER
Power Considerations
This section provides information on power dissipation and junction temperature for the ICS84330CI.
Equations and example calculations are also provided.
1. Power Dissipation.
The total power dissipation for the ICS84330CI is the sum of the core power plus the power dissipated in the load(s).
The following is the power dissipation for VCC = 3.3V + 5% = 3.465V, which gives worst case results.
NOTE: Please refer to Section 3 for details on calculating power dissipated in the load.
•
•
Power (core)MAX = VCC_MAX * IEE_MAX = 3.465V * 17mA = 58.9mW
Power (outputs)MAX = 30mW/Loaded Output Pair
Total Power_MAX (3.465V, with all outputs switching) = 58.9mW + 30mW = 88.9mW
2. Junction Temperature.
Junction temperature, Tj, is the temperature at the junction of the bond wire and bond pad directly affects the reliability of the device. The
maximum recommended junction temperature is 125°C. Limiting the internal transistor junction temperature, Tj, to 125°C ensures that the bond
wire and bond pad temperature remains below 125°C.
The equation for Tj is as follows: Tj = θJA * Pd_total + TA
Tj = Junction Temperature
θJA = Junction-to-Ambient Thermal Resistance
Pd_total = Total Device Power Dissipation (example calculation is in section 1 above)
TA = Ambient Temperature
In order to calculate junction temperature, the appropriate junction-to-ambient thermal resistance θJA must be used. Assuming a moderate air
flow of 200 linear feet per minute and a multi-layer board, the appropriate value is 31.1°C/W per Table 8A below.
Therefore, Tj for an ambient temperature of 70°C with all outputs switching is:
85°C + 0.89W * 31.1°C/W = 112.7°C. This is below the limit of 125°C.
This calculation is only an example. Tj will obviously vary depending on the number of loaded outputs, supply voltage, air flow and the type of
board (multi-layer).
Table 8A. Thermal Resistance θJA for 28 Lead PLCC, Forced Convection
θJA by Velocity
Linear Feet per Minute
0
200
500
Multi-Layer PCB, JEDEC Standard Test Boards
37.8°C/W
31.1°C/W
28.3°C/W
Table 8B. Thermal Resistance θJA for 32 Lead LQFP, Forced Convection
θJA by Velocity
Linear Feet per Minute
0
200
500
Single-Layer PCB, JEDEC Standard Test Boards
Multi-Layer PCB, JEDEC Standard Test Boards
67.8°C/W
47.9°C/W
55.9°C/W
42.1°C/W
50.1°C/W
39.4°C/W
NOTE: Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs.
ICS84330CVI REVISION A JANUARY 7, 2011
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©2011 Integrated Device Technology, Inc.
ICS84330CI Data Sheet
720MHZ, CRYSTAL-TO-LVPECL FREQUENCY SYNTHESIZER
3. Calculations and Equations.
The purpose of this section is to calculate the power dissipation for the LVPECL output pair.
LVPECL output driver circuit and termination are shown in Figure 7.
VCC
Q1
VOUT
RL
50Ω
VCC - 2V
Figure 7. LVPECL Driver Circuit and Termination
To calculate worst case power dissipation into the load, use the following equations which assume a 50Ω load, and a termination voltage of
VCC - 2V.
•
•
For logic high, VOUT = VOH_MAX = VCC_MAX - 0.9V
(VCC_MAX - VOH_MAX) = 0.9V
For logic low, VOUT = VOL_MAX = VCC_MAX - 1.7V
(VCC_MAX - VOL_MAX) = 1.7V
Pd_H is power dissipation when the output drives high.
Pd_L is the power dissipation when the output drives low.
Pd_H = [(VOH_MAX - (VCC_MAX -2V))/RL] * (VCC_MAX - VOH_MAX) = [(2V - (VCC_MAX - VOH_MAX))/RL] * (VCC_MAX - VOH_MAX) =
[(2V - 0.9V)/50Ω] * 0.9V = 19.8mW
Pd_L = [(VOL_MAX - (VCC_MAX -2V))/RL] * (VCC_MAX - VOL_MAX) = [(2V - (VCC_MAX - VOL_MAX))/RL] * (VCC_MAX - VOL_MAX) =
[(2V - 1.7V)/50Ω] * 1.7V = 10.2mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 30mW
ICS84330CVI REVISION A JANUARY 7, 2011
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©2011 Integrated Device Technology, Inc.
ICS84330CI Data Sheet
720MHZ, CRYSTAL-TO-LVPECL FREQUENCY SYNTHESIZER
Reliability Information
Table 9A. θJA vs. Air Flow Table for a 28 Lead PLCC
θJA vs. Air Flow
Linear Feet per Minute
0
200
500
Multi-Layer PCB, JEDEC Standard Test Boards
37.8°C/W
31.1°C/W
28.3°C/W
Table 9B. θJA vs. Air Flow Table for a 32 Lead LQFP
θJA vs. Air Flow
0
Linear Feet per Minute
200
500
Single-Layer PCB, JEDEC Standard Test Boards
Multi-Layer PCB, JEDEC Standard Test Boards
67.8°C/W
47.9°C/W
55.9°C/W
42.1°C/W
50.1°C/W
39.4°C/W
NOTE: Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs.
Transistor Count
The transistor count for ICS84330CI is: 4498
ICS84330CVI REVISION A JANUARY 7, 2011
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©2011 Integrated Device Technology, Inc.
ICS84330CI Data Sheet
720MHZ, CRYSTAL-TO-LVPECL FREQUENCY SYNTHESIZER
Package Outline and Package Dimensions
Package Outline - V Suffix for 28 Lead PLCC
Table 10A. Package Dimensions for 28 Lead PLCC
JEDEC Variation
All Dimensions in Millimeters
Symbol
N
Minimum
Maximum
28
A
A1
4.19
2.29
1.57
0.33
0.19
12.32
11.43
5.21
4.57
3.05
2.11
0.53
0.32
12.57
11.58
5.46
A2
b
c
D/E
D1/E1
D2/E2
Reference Document: JEDEC Publication 95, MS-018
ICS84330CVI REVISION A JANUARY 7, 2011
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©2011 Integrated Device Technology, Inc.
ICS84330CI Data Sheet
720MHZ, CRYSTAL-TO-LVPECL FREQUENCY SYNTHESIZER
Package Outline - Y Suffix for 32 Lead LQFP
Table 10B. Package Dimensions for 32 Lead LQFP
JEDEC Variation: BBA
All Dimensions in Millimeters
Symbol
Minimum
Nominal
Maximum
N
32
A
A1
1.60
0.15
1.45
0.45
0.20
0.05
1.35
0.30
0.09
A2
1.40
0.37
b
c
D & E
D1 & E1
D2 & E2
e
9.00 Basic
7.00 Basic
5.60 Ref.
0.80 Basic
0.60
L
0.45
0°
0.75
7°
θ
ccc
0.10
Reference Document: JEDEC Publication 95, MS-026
ICS84330CVI REVISION A JANUARY 7, 2011
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©2011 Integrated Device Technology, Inc.
ICS84330CI Data Sheet
720MHZ, CRYSTAL-TO-LVPECL FREQUENCY SYNTHESIZER
Ordering Information
Table 11. Ordering Information
Part/Order Number
84330CVI
84330CVIT
84330CVILF
84330CVILFT
84330CYI
84330CYIT
84330CYILF
84330CYILFT
Marking
Package
28 Lead PLCC
28 Lead PLCC
Shipping Packaging
Tube
500 Tape & Reel
Tube
500 Tape & Reel
Tube
1000 Tape & Reel
Tube
Temperature
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
ICS84330CVI
ICS84330CVI
ICS84330CVILF
ICS84330CVILF
ICS84330CYI
ICS84330CYI
ICS84330CYIL
ICS84330CYIL
Lead-Free, 28 Lead PLCC
Lead-Free, 28 Lead PLCC
32 Lead LQFP
32 Lead LQFP
Lead-Free, 32 Lead LQFP
Lead-Free, 32 Lead LQFP
1000 Tape & Reel
NOTE: Parts that are ordered with an "LF" suffix to the part number are the Pb-Free configuration and are RoHS compliant.
While the information presented herein has been checked for both accuracy and reliability, Integrated Device Technology (IDT) assumes no responsibility for either its use or for the
infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use in normal
commercial and industrial applications. Any other applications, such as those requiring high reliability or other extraordinary environmental requirements are not recommended without
additional processing by IDT. IDT reserves the right to change any circuitry or specifications without notice. IDT does not authorize or warrant any IDT product for use in life support
devices or critical medical instruments.
ICS84330CVI REVISION A JANUARY 7, 2011
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©2011 Integrated Device Technology, Inc.
ICS84330CI Data Sheet
720MHZ, CRYSTAL-TO-LVPECL FREQUENCY SYNTHESIZER
Revision History Sheet
Rev
Table
Page
Description of Change
Date
A
1
Features Section - corrected Output Frequency Range from 25MHz to 31.25MHz.
12/7/04
8
Added Recommendations for Unused Input and Output Pins.
T10A
17
Package Dimension Table - D2/E2 changed the min. from 4.85 to 5.21 and the max. from
5.56 to 5.46.
A
A
A
2/2/09
Converted datasheet format.
T11
T7
18
6
Ordering Information - Added “Lead-Free” marking for the PLCC and LQFP packages.
2/19/09
1/7/11
AC Characteristics Table - due to datasheet format conversion, corrected cycle-to-cycle
test conditions back to original conditions.
9
Updated Overdriving the XTAL Interface.
Updated new Header/Footer format.
ICS84330CVI REVISION A JANUARY 7, 2011
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©2011 Integrated Device Technology, Inc.
ICS84330CI Data Sheet
720MHZ, CRYSTAL-TO-LVPECL FREQUENCY SYNTHESIZER
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DISCLAIMER Integrated Device Technology, Inc. (IDT) and its subsidiaries reserve the right to modify the products and/or specifications described herein at any time and at IDT’s sole discretion. All information in this document,
including descriptions of product features and performance, is subject to change without notice. Performance specifications and the operating parameters of the described products are determined in the independent state and are not
guaranteed to perform the same way when installed in customer products. The information contained herein is provided without representation or warranty of any kind, whether express or implied, including, but not limited to, the
suitability of IDT’s products for any particular purpose, an implied warranty of merchantability, or non-infringement of the intellectual property rights of others. This document is presented only as a guide and does not convey any
license under intellectual property rights of IDT or any third parties.
IDT’s products are not intended for use in life support systems or similar devices where the failure or malfunction of an IDT product can be reasonably expected to significantly affect the health or safety of users. Anyone using an IDT
product in such a manner does so at their own risk, absent an express, written agreement by IDT.
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party owners.
Copyright 2011. All rights reserved.
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