85211BMI-03LF [IDT]
Low Skew Clock Driver, PDSO8;型号: | 85211BMI-03LF |
厂家: | INTEGRATED DEVICE TECHNOLOGY |
描述: | Low Skew Clock Driver, PDSO8 驱动 光电二极管 逻辑集成电路 |
文件: | 总15页 (文件大小:593K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LOW SKEW, 1-TO-2 DIFFERENTIAL-TO-
LVHSTL FANOUT BUFFER
ICS85211BI-03
GENERAL DESCRIPTION
FEATURES
The ICS85211BI-03 is a low skew, high perfor-
• Two differential LVHSTL compatible outputs
• One differential CLK, nCLK input pair
ICS
HiPerClockS™
mance 1-to-2 Differential-to-LVHSTL Fanout
Buffer and a member of the HiPerClockS™
family of High Performance Clock Solutions
from IDT The CLK, nCLK pair can accept most
• CLK, nCLK pair can accept the following differential input
levels: LVDS, LVPECL, LVHSTL, SSTL, HCSL
standard differential input levels.The ICS85211BI-03 is char-
acterized to operate from a 3.3V power supply. Guar-
anteed output and part-to-part skew characteristics
make the ICS85211BI-03 ideal for those clock distribu-
tion applications demanding well defined performance
and repeatability.
• Maximum output frequency: 700MHz
• Translates any single-ended input signal to LVHSTL levels with
resistor bias on nCLK input
• Output skew: 30ps (maximum)
• Part-to-part skew: 250ps (maximum)
• Propagation delay: 1.3ns (maximum)
• Output duty cycle: 49% - 51% up to 266.6MHz
• VOH = 1.15V (maximum)
• 3.3V operating supply
• -40°C to 85°C ambient operating temperature
• Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
BLOCK DIAGRAM
PIN ASSIGNMENT
Q0
nQ0
Q1
VDD
1
2
3
4
8
7
6
5
Q0
nQ0
CLK
nCLK
GND
CLK
nCLK
Q1
nQ1
nQ1
ICS85211BI-03
8-Lead SOIC
3.90mm x 4.90mm x 1.37mm package body
M Package
Top View
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TABLE 1. PIN DESCRIPTIONS
Number
1, 2
Name
Q0, nQ0
Q1, nQ1
GND
Type
Description
Output
Output
Power
Differential output pair. LVHSTL interface levels.
Differential output pair. LVHSTL interface levels.
Power supply ground.
3, 4
5
Pullup/
Pulldown
6
nCLK
Input
Inverting differential clock input. VDD/2 default when left floating.
7
8
CLK
VDD
Input
Pullup
Non-inverting differential clock input.
Positive supply pin.
Power
NOTE: Pullup and Pulldown refer to internal input resistors. See Table 2, Pin Characteristics, for typical values.
TABLE 2. PIN CHARACTERISTICS
Symbol Parameter
Test Conditions
Minimum Typical
Maximum Units
CIN
Input Capacitance
Input Pullup Resistor
4
pF
kΩ
kΩ
RPULLUP
51
51
RPULLDOWN Input Pulldown Resistor
TABLE 3. CLOCK INPUT FUNCTION TABLE
Inputs
Outputs
Input to Output Mode
Polarity
CLK
nCLK
Q0, Q1
nQ0, nQ1
HIGH
LOW
0
0
LOW
HIGH
LOW
HIGH
HIGH
LOW
Differential to Differential
Differential to Differential
Single Ended to Differential
Single Ended to Differential
Single Ended to Differential
Single Ended to Differential
Non Inverting
Non Inverting
Non Inverting
Non Inverting
Inverting
1
1
0
Biased; NOTE 1
HIGH
LOW
1
Biased; NOTE 1
Biased; NOTE 1
Biased; NOTE 1
0
1
LOW
HIGH
Inverting
NOTE 1: Please refer to the Application Information section, "Wiring the Differential Input to Accept Single Ended Levels".
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ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
4.6V
NOTE: Stresses beyond those listed under Absolute
Maximum Ratings may cause permanent damage to the
device.These ratings are stress specifications only. Functional op-
eration 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 ex-
tended periods may affect product reliability.
DD
Inputs, V
-0.5V to VDD + 0.5 V
I
Outputs, IO
Continuous Current
Surge Current
50mA
100mA
Package Thermal Impedance, θJA 112.7°C/W (0 lfpm)
Storage Temperature, T -65°C to 150°C
STG
TABLE 4A. POWER SUPPLY DC CHARACTERISTICS, VDD = 3.3V 5%, TA = -40°C TO 85°C
Symbol Parameter
Test Conditions
Minimum
Typical
Maximum Units
VDD
IDD
Power Supply Voltage
Power Supply Current
3.135
3.3
3.465
55
V
mA
TABLE 4B. DIFFERENTIAL DC CHARACTERISTICS, VDD = 3.3V 5%, TA = -40°C TO 85°C
Symbol Parameter Test Conditions Minimum Typical Maximum Units
nCLK
CLK
V
DD = VIN = 3.465V
VDD = VIN = 3.465V
DD = 3.465V, VIN = 0V
150
150
µA
µA
µA
µA
V
IIH
Input High Current
nCLK
CLK
V
-150
-5
IIL
Input Low Current
VDD = 3.465V, VIN = 0V
VPP
Peak-to-Peak Input Voltage
0.15
1.3
Common Mode Input Voltage;
NOTE 1, 2
VCMR
0.5
VDD - 0.85
V
NOTE 1: For single ended applications the maximum input voltage for CLK and nCLK is VDD + 0.3V.
NOTE 2: Common mode voltage is defined as VIH.
TABLE 4C. LVHSTL DC CHARACTERISTICS, VDD = 3.3V 5%, TA = -40°C TO 85°C
Symbol Parameter
Test Conditions
Minimum Typical Maximum Units
VOH
Output High Voltage
0.7
0
1.15
0.4
V
V
V
VOL
Output Low Voltage
VSWING
Peak-to-Peak Output Voltage Swing
0.3
0.65
1.15
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TABLE 5. AC CHARACTERISTICS, VDD = 3.3V 5%, TA = -40°C TO 85°C
Symbol Parameter
Test Conditions
Minimum
Typical
Maximum Units
fMAX
Output Frequency
700
1.3
30
MHz
ns
ps
ps
ps
%
tPD
Propagation Delay; NOTE 1
Output Skew; NOTE 2, 4
Part-to-Part Skew; NOTE 3, 4
Output Rise/Fall Time
IJ 600MHz
0.9
tsk(o)
tsk(pp)
tR / tF
250
450
53
20% to 80%
185
47
odc
Output Duty Cycle
IJ 266.6MHz
49
51
%
All parameters measured at 600MHz unless noted otherwise.
The cycle-to-cycle jitter on the input will equal the jitter on the output. The part does not add jitter.
NOTE 1: Measured from the differential input crossing point to the differential output crossing point.
NOTE 2: Defined as skew between outputs at the same supply voltage and with equal load conditions.
Measured at output differential cross points.
NOTE 3: Defined as skew between outputs on different devices operating at the same supply voltages and with equal load
conditions. Using the same type of inputs on each device, the outputs are measured at the differential cross points.
NOTE 4: This parameter is defined in accordance with JEDEC Standard 65.
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PARAMETER MEASUREMENT INFORMATION
3.3V 5%
VDD
SCOPE
VDD
Qx
nCLK
CLK
VPP
VCMR
Cross Points
LVHSTL
nQx
GND
GND
0V
3.3V OUTPUT LOAD AC TEST CIRCUIT
DIFFERENTIAL INPUT LEVEL
nQx
Qx
Qx
PART 1
nQx
Qy
nQy
PART 2
nQy
Qy
tsk(pp)
tsk(o)
OUTPUT SKEW
PART-TO-PART SKEW
nCLK
CLK
80%
tF
80%
VSWING
20%
Clock
20%
nQ0, nQ1
Q0, Q1
Outputs
tR
tPD
OUTPUT RISE/FALL TIME
PROPAGATION DELAY
nQ0, nQ1
Q0, Q1
tPW
tPERIOD
tPW
odc =
x 100%
tPERIOD
OUTPUT DUTY CYCLE/PULSE WIDTH PERIOD
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APPLICATION INFORMATION
WIRING THE DIFFERENTIAL INPUT TO ACCEPT SINGLE ENDED LEVELS
Figure 1 shows how the differential input can be wired to accept
single ended levels. The reference voltage V_REF = V /2 is
generated by the bias resistors R1, R2 and C1. This bias DcDircuit
should be located as close as possible to the input pin. The ratio
of R1 and R2 might need to be adjusted to position the V_REF in
the center of the input voltage swing. For example, if the input
clock swing is only 2.5V and V = 3.3V, V_REF should be 1.25V
DD
and R2/R1 = 0.609.
VDD
R1
1K
Single Ended Clock Input
V_REF
CLK
nCLK
C1
0.1u
R2
1K
FIGURE 1. SINGLE ENDED SIGNAL DRIVING DIFFERENTIAL INPUT
RECOMMENDATIONS FOR UNUSED OUTPUT PINS
OUTPUTS:
LVHSTL OUTPUT
All unused LVHSTL outputs 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.
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DIFFERENTIAL CLOCK INPUT INTERFACE
The CLK /nCLK accepts LVDS, LVPECL, LVHSTL, SSTL, HCSL
and other differential signals. Both VSWING and VOH must meet the
VPP and VCMR input requirements. Figures 2A to 2E show interface
examples for the HiPerClockS CLK/nCLK input driven by the most
common driver types. The input interfaces suggested here are
examples only. Please consult with the vendor of the driver
component to confirm the driver termination requirements. For
example in Figure 2A, the input termination applies for IDT
HiPerClockS LVHSTL drivers. If you are using an LVHSTL driver
from another vendor, use their termination recommendation.
3.3V
3.3V
3.3V
1.8V
Zo = 50 Ohm
CLK
Zo = 50 Ohm
CLK
Zo = 50 Ohm
nCLK
Zo = 50 Ohm
HiPerClockS
LVPECL
Input
nCLK
HiPerClockS
LVHSTL
Input
R1
50
R2
50
ICS
R1
50
R2
50
HiPerClockS
LVHSTL Driver
R3
50
FIGURE 2A. HIPERCLOCKS CLK/nCLK INPUT DRIVEN BY
ICS HIPERCLOCKS LVHSTL DRIVER
FIGURE 2B. HIPERCLOCKS CLK/nCLK INPUT DRIVEN BY
3.3V LVPECL DRIVER
3.3V
3.3V
3.3V
3.3V
Zo = 50 Ohm
3.3V
R3
125
R4
125
LVDS_Driver
Zo = 50 Ohm
Zo = 50 Ohm
CLK
CLK
R1
100
nCLK
Receiv er
nCLK
HiPerClockS
Input
Zo = 50 Ohm
LVPECL
R1
84
R2
84
FIGURE 2C. HIPERCLOCKS CLK/nCLK INPUT DRIVEN BY
3.3V LVPECL DRIVER
FIGURE 2D. HIPERCLOCKS CLK/nCLK INPUT DRIVEN BY
3.3V LVDS DRIVER
3.3V
3.3V
3.3V
R3
125
R4
125
C1
C2
LVPECL
Zo = 50 Ohm
Zo = 50 Ohm
CLK
nCLK
HiPerClockS
Input
R5
100 - 200
R6
100 - 200
R1
84
R2
84
R5,R6 locate near the driver pin.
FIGURE 2E. HIPERCLOCKS CLK/NCLK INPUT DRIVEN BY
3.3V LVPECL DRIVER WITH AC COUPLE
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SCHEMATIC EXAMPLE
Figure 3 shows a schematic example of ICS85211BI-03. In this
example, the input is driven by an IDT HiPerClockS LVHSTL
driver. The decoupling capacitors should be physically located
near the power pin.
Zo = 50 Ohm
1.8V
-
U1
Zo = 50 Ohm
Zo = 50 Ohm
5
6
7
8
4
3
2
1
Zo = 50 Ohm
GND
nCLK
CLK
nQ1
Q1
nQ0
Q0
+
VDD
R1
50
R2
50
LVHSTL Input
VDD=3.3V
LVHSTL
ICS
ICS85211BMI-03
R6
50
R5
50
C1
0.1u
HiPerClockS
LVHSTL Driver
Zo = 50 Ohm
Zo = 50 Ohm
-
+
Unused Output
Can Be Floated
R3
50
R4
50
LVHSTL Input
FIGURE 3. ICS85211BI-03 LVHSTL BUFFER SCHEMATIC EXAMPLE
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POWER CONSIDERATIONS
This section provides information on power dissipation and junction temperature for the ICS85211BI-03.
Equations and example calculations are also provided.
1. Power Dissipation.
The total power dissipation for the ICS85211BI-03 is the sum of the core power plus the power dissipated in the load(s).
The following is the power dissipation for V = 3.3V + 5% = 3.465V, which gives worst case results.
DD
NOTE: Please refer to Section 3 for details on calculating power dissipated in the load.
•
•
Power (core) = V
* I
= 3.465V * 55mA = 190.6mW
DD_MAX
MAX
DD_MAX
Power (outputs) = 77.76mW/Loaded Output pair
MAX
If all outputs are loaded, the total power is 2 * 77.76mW = 155.52mW
Total Power
(3.465V, with all outputs switching) = 190.6mW + 155.52mW = 346.12mW
_MAX
2. Junction Temperature.
Junction temperature, Tj, is the temperature at the junction of the bond wire and bond pad and directly affects the reliability of the
TM
device. The maximum recommended junction temperature for HiPerClockS devices is 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 103.3°C/W per Table 6 below.
Therefore, Tj for an ambient temperature of 85°C with all outputs switching is:
85°C + 0.346W * 103.3°C/W = 120.7°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 (single layer or multi-layer).
TABLE 6. THERMAL RESISTANCE θ FOR 8-PIN SOIC, FORCED CONVECTION
JA
θ by Velocity (Linear Feet per Minute)
JA
0
200
128.5°C/W
103.3°C/W
500
115.5°C/W
97.1°C/W
Single-Layer PCB, JEDEC Standard Test Boards
Multi-Layer PCB, JEDEC Standard Test Boards
153.3°C/W
112.7°C/W
NOTE: Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs.
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3. Calculations and Equations.
The purpose of this section is to derive the power dissipated into the load.
LVHSTL output driver circuit and termination are shown in Figure 4.
VDD
Q1
VOUT
RL
50Ω
FIGURE 4. LVHSTL DRIVER CIRCUIT AND TERMINATION
To calculate worst case power dissipation into the load, use the following equations which assume a 50Ω load.
Pd_H is power dissipation when the output drives high.
Pd_L is the power dissipation when the output drives low.
Pd_H = (V
Pd_L = (V
/R ) * (V
- V
)
OH_MAX
OH_MAX
DD_MAX
L
/R ) * (V
- V
)
OL_MAX
DD_MAX
OL_MAX
L
Pd_H = (1.15V/50Ω) * (3.465V - 1.15V) = 53.24mW
Pd_L = (0.4V (50Ω) * (3.465V - 0.4V) = 24.52mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 77.76mW
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RELIABILITY INFORMATION
TABLE 7. θ VS. AIR FLOW TABLE FOR 8 LEAD SOIC
JA
θ by Velocity (Linear Feet per Minute)
JA
0
200
128.5°C/W
103.3°C/W
500
115.5°C/W
97.1°C/W
Single-Layer PCB, JEDEC Standard Test Boards
Multi-Layer PCB, JEDEC Standard Test Boards
153.3°C/W
112.7°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 ICS85211BI-03 is: 472
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PACKAGE OUTLINE - M SUFFIX FOR 8 LEAD SOIC
TABLE 8. PACKAGE DIMENSIONS
Millimeters
SYMBOL
MINIMUN
MAXIMUM
N
A
A1
B
C
D
E
e
8
1.35
0.10
0.33
0.19
4.80
3.80
1.75
0.25
0.51
0.25
5.00
4.00
1.27 BASIC
H
h
5.80
0.25
0.40
0°
6.20
0.50
1.27
8°
L
α
Reference Document:JEDEC Publication 95, MS-012
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TABLE 9. ORDERING INFORMATION
Part/Order Number
ICS85211BMI-03
Marking
211BMI03
211BMI03
211BI03N
211BI03N
Package
8 lead SOIC
Shipping Packaging
tube
Temperature
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
ICS85211BMI-03T
ICS85211BMI-03LN
ICS85211BMI-03LNT
8 lead SOIC
2500 tape & reel
tube
8 lead "Lead-Free" SOIC
8 lead "Lead-Free" SOIC
2500 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, Incorporated (IDT) assumes no responsibility for either its use or for
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.
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REVISION HISTORY SHEET
Rev
Table
Page
Description of Change
Date
T4A
3
8
Power Supply Table - changed IDD max. from 50mA to 55mA.
B
10/15/03
Power Considerations - changed the IDD limit from 50mA to 55mA to reflect
Table 4A. Recalculated Power Dissipation and Junction Temperature formulas.
Features Section - add Lead-Free bullet.
1
7
B
Updated Differential Clock Input Interface section.
9/14/04
T8
T8
12
Added Lead-Free part number to Ordering Information table.
B
B
12
12
Ordering Information Table - corrected Lead-Free P/N from "LF" to "LN".
Ordering Information Table - corrected marking to read 211BMI02".
10/11/04
10/18/04
T8
6
9-10
13
Added Recommendations for Unused Input and Output Pins.
Corrected Power Considerations, Power Dissipation calculation.
Ordering Information Table - added lead-free note.
B
B
11/15/05
8/23/06
T9
T9
13
Ordering Information Table - corrected lead-free marking.
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LOW SKEW, 1-TO-2 DIFFERENTIAL-TO-LVHSTL FANOUT BUFFER
Innovate with IDT and accelerate your future networks. Contact:
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Integrated Device Technology
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Europe
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Fax: +44 (0) 1372 378851
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© 2006 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice. IDT, the IDT logo, ICS and HiPerClockS are trademarks
of Integrated Device Technology, Inc. Accelerated Thinking is a service mark of Integrated Device Technology, Inc. All other brands, product names and marks are or may be
trademarks or registered trademarks used to identify products or services of their respective owners.
Printed in USA
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