IMISG522BXB [CYPRESS]
Clock Generator, CMOS, PDSO16, SOIC-16;
| 型号： | IMISG522BXB |
| 厂家： | 
CYPRESS |
| 描述： | Clock Generator, CMOS, PDSO16, SOIC-16 光电二极管 外围集成电路 |
| 文件： | 总12页 (文件大小：120K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SG521/22/24/28
Spread Spectrum Clock Generator
Approved Product
Features
Applications
•
•
•
•
•
•
•
•
CPU and µC Based Digital Systems
Laser and Inkjet Printers
Digital Copiers
Multifunction Products (MFPs)
Disk Drives
CD-ROM
Automotive
Video and Imaging Applications
•
•
•
•
•
•
•
•
•
•
•
•
•
Generates Spread Spectrum Clock (SSC)
Programmable Frequencies from 10 to 120 MHz
1.00% and 3.00% Down-Spread Options
Separate Non-Modulated Clock
Pin-Programmable Spread on/off Function
50% Output Clock Duty Cycle
Power-Down Mode for Low Power Dissipation
TTL or CMOS Compatible Outputs
Low Cycle-to-Cycle Jitter of 250 ps-max
External Clock or Crystal Oscillator Operation
Glitch-Free Switching
Benefits
3 to 5V Operation Supply Range
16-Pin Plastic SOIC Package
•
•
•
12 to 20dB EMI Reduction
Fast Time to Market
Low System and Development Cost
General Description
IMI SG521/22/24/28 products are Spread Spectrum Clock Generators designed to reduce the high levels of
Electromagnetic Interference (EMI) found in high-speed digital systems.
By using a modulated clock as the source for all system clocks and timing signals, the amount of radiated energy
(EMI) throughout the system is greatly reduced. Energy reduction is related to the harmonic frequency, such that
the higher the frequency the greater the energy reduction. The 5th harmonic has greater energy reduction than the
fundamental frequency.
The SG521/2/4/8 products produce a wide range of clock frequencies from 10 to 120 MHz, which are frequency
modulated (PRCLK) by using a Spread Spectrum Clock (SSC) technique to reduce electromagnetic interference
(EMI). In addition, a non-modulated clock output (MPCLK) with various standard clock frequencies is also provided
for the part of the system that could be sensitive to a modulated clock. Refer to the Product Selection and
Frequency Selection Truth Tables for the available modulated and non-modulated clock frequencies.
The spread function can be turned on or off using the SSON control line. When spread is enabled, the modulated
output clock is down-spread at either 1.00% or 3.00% total spread.
These products are designed to be used with fixed frequency external clocks or crystal oscillators. The output clock
frequencies are designed using a 14.318, 44.24 or 48 MHz reference clock.
The products operate from a 3 to 5 volt power supply and 0 to 70°C temperature range. The SG521/2/4/8 parts are
available in 16-pin plastic SOIC packages and in die form.
Contact IMI for other packaging and Spread Spectrum Clock Generator (SSCG) products.
INTERNATIONAL MICROCIRCUITS,INC. 525 LOS COCHES ST.,
MILPITAS, CA 95035 408-263-6300, FAX 408-263-6571
http:/www.imicorp.com
Rev. 1.3
7/21/1999
Page 1 of 12
SG521/22/24/28
Spread Spectrum Clock Generator
Approved Product
Block Diagram
= Control
VCO / N
LF
OSCin
2
Phase
Detector
/ R
VCO
OSCout
3
MPCLK/S3
Fixed Frequency
14
PLL
S0
7
S1
S4
SSON
SS-SEL
TEST
8
5
9
10
16
SSCG/
Power Down
Control
PRCLK/S2
Output
Divider
Power On/Reset
12
VDD VDD VDD VSS VSS VSS
1
6
4
11
15
13
Figure 1. Block Diagram
Ordering Information
Part Number
Number of Pins and Package
16-Pin SOIC
Temperature Range
0 to 70°C
IMISG521BXB
IMISG522BXB
IMISG524BXB
IMISG528BXB
16-Pin SOIC
0 to 70°C
16-Pin SOIC
0 to 70°C
16-Pin SOIC
0 to 70°C
INTERNATIONAL MICROCIRCUITS,INC. 525 LOS COCHES ST.,
MILPITAS, CA 95035 408-263-6300, FAX 408-263-6571
http:/www.imicorp.com
Rev. 1.3
7/21/1999
Page 2 of 12
SG521/22/24/28
Spread Spectrum Clock Generator
Approved Product
Pin Configuration
VDD
OSCin
OSCout
VSS
1
2
3
4
5
6
7
8
16
15
TEST
VDD
SG521
---------- 14
SG522
MPCLK/S3
VSS
13
----------
SG524
----------
SG528
S4
12
11
10
9
PRCLK/S2
VSS
VDD
S0
SS-SEL
SSON
S1
Figure 2. SG521/22/24/28 SOIC Package Pin Assignment
Pin Description
Pin
#
Signal
Name
VDD
I/O Default
Description
State
1
P
I
Power Positive Power Supply.
2
3
4
5
OSCin
OSCout
VSS
N/A
N/A
GND.
1
Input pin of on-chip reference oscillator.
O
P
I
Output pin of on-chip reference oscillator. If Crystal Oscillator is used, this pin is left unconnected.
Power Supply Ground.
S4
Digital logic input used to select required crystal input frequency range, frequency spread clock
(PRCLK) and non-spread clock MPCLK output frequencies. This pin has internal 150 K ohm pull-up
resistor to VDD. Refer to Frequency Selection Tables for Truth Table.
6
7
VDD
S0
P
I
Positive Power Supply
0
0
1
1
Digital logic input used to select required crystal input frequency range, frequency spread clock
(PRCLK) and non-spread clock MPCLK output frequencies. This pin has internal 150 K ohm pull-down
resistor to GND. Refer to Frequency Selection Tables for Truth Table.
8
9
S1
I
I
I
Digital logic input used to select required crystal input frequency range, frequency spread clock
(PRCLK) and non-spread clock MPCLK output frequencies. This pin has internal 150 K ohm pull-down
resistor to GND. Refer to Frequency Selection Tables for Truth Table.
SSON
SS-SEL
Input digital control pin used to enable or disable the frequency modulation function at PRCLK Output
(Pin-12). When this pin is low (GND) spread function is on. When high (VDD), spread function is turned-
off. This pin has 150 K ohm internal pulled-up to VDD.
10
Used to select total Frequency Modulation (Spread) amount. The spread is either 1.00%(Narrow) or
3.00%(Wide). Both spreads are down-center with respect to output frequency at PRCLK (Pin-12). Refer
to Frequency and Spread selection Tables for the Spread selection logic states. This pin has 150 K
internal pull-up resistor to VDD.
11
12
VSS
P
GND.
1
Power Supply Ground
PRCLK/S2 I/O
Bi-directional pin used to share input control and output drive function. During power-on, this pin is a
digital input and latches that state (High or Low) into an internal register as a valid S2 state. After power
has reached a pre-determined level, pin 12 becomes the driver for the PRCLK modulated output clock.
This pin has 150 K ohm internal pull-up resistor to VDD. For proper operation, an external 4.7 K ohm
resistor connected to VDD or VSS is required. Refer to Frequency Selection Truth Tables for proper
operation.
13
14
VSS
P
GND.
1
Power Supply Ground
MPCLK/S3 O/I
Bi-directional pin used to share input control and output drive function. During power-on, this pin is a
digital input and latches that state (High or Low) into an internal register as a valid S3 state. After power
has reached a pre-determined level, pin 14 becomes the driver for the MPCLK non-modulated output
clock. This pin has 150 K ohm internal pull-up resistor to VDD. Refer to Frequency Selection Truth
Tables for proper operation.
15
16
VDD
P
I
Power Positive Power Supply
Provides Power-Down and Hi-Z function when used in conjunction with S0 and S1 digital inputs. This
pin has internal pull-down to GND. Refer to Frequency Selection Truth Tables for proper operation.
TEST
0
INTERNATIONAL MICROCIRCUITS,INC. 525 LOS COCHES ST.,
MILPITAS, CA 95035 408-263-6300, FAX 408-263-6571
http:/www.imicorp.com
Rev. 1.3
7/21/1999
Page 3 of 12
SG521/22/24/28
Spread Spectrum Clock Generator
Approved Product
Absolute Maximum Ratings
Symbol
VDD
Vimax
Vomax
Top
Parameter
Min.
VSS
-0.3
-0.3
0
Typical
Max.
7.0
Unit
V
Conditions
Measured from pin 1, 6 or 15 to VSS
Pins 5, 7, 8, 9, 10, 12, 14 and 16.
Pins 12 and 14
Supply Voltage
3.3/5.0
Input Voltage Relative to VSS
Output Voltage Relative to VSS
Operating Temperature
-
-
-
-
-
VDD+0.3
VDD+0.3
70
V
V
Refer to QA report.
°C
°C
°C
Tst
Storage Temperature
-55
-
150
Refer to QA report.
Tjc
Soldering Junction Temperature
300
10 seconds soldering
Note: Operation at any Absolute Maximum Rating is not implied. Refer to DC Electrical Characteristics for
proper Operating Range.
Test Conditions: VDD=5.0V (+/-10%), CL=15pF, Operating Temperature = 0 to 70°C unless otherwise
specified
DC Electrical Characteristics
Symbol
Parameter
Min. Typical Max.
Unit
V
Conditions
VDD
Power Supply Voltage, Operating
3.135 3.3/5.0
5.5
Measured from pin 1, 6 or 15 to VSS
Pin 2.
OSCin-cl Oscillator Input Load Capacitance
OSCout-cl Oscillator Output Load Capacitance
3
5
pF
pF
Pin 3.
Vinl
Vinh
Iinl
Input Voltage, Low
Input Voltage, High
Input Current, Low
Input Current, High
-
-
0.8
-
V
Pins 5, 7, 8, 9, 10, 12, 14 and 16.
Pins 5, 7, 8, 9, 10, 12, 14 and 16.
Pins 5, 7, 8, 9, 10, 12, 14 and 16.
Pins 5, 7, 8, 9, 10, 12, 14 and 16.
Pins 5, 7, 8, 9, 10, 12, 14 and 16.
VDD = 5.00 VDC
2.0
-
V
-
-
-
50
50
250
-
µA
Iinh
-
µA
Rpu/Rpd Pull-up/down Resistors
100
150
12.5
23.0
3
KΩ
Ohms
Ohms
pF
Zo
Zo
Clock Output Impedance, PRCLK
-
-
Clock Output Impedance, MPCLK
Capacitance, Input
-
VDD = 5.00 VDC
Cin
Pins 2, 5, 7, 8, 9, 10, 12, 14 and 16
Pins 2, 5, 7, 8, 9, 10, 12, 14 and 16
Pins 2, 5, 7, 8, 9, 10, 12, 14 and 16
Ref. = 48 MHz,
PRCLK = 50.00 MHz, No Load.
IDDt
IDDs
IDDd
Current, Leakage, Tri-State
Current, Power Supply, Static
Current, Power Supply, Dynamic
-
-
-
-
5
µA
200
-
500
80
µA
mA
IDDpd
Isco
Current, Power Supply, Power Down
Current, Output, Short Circuit
-
-
25
-
Test = 1.
µA
25
30
mA
PRCLK and MPCLK
Notes: Pins 5, 7, 8, 9, 10, 12, 14 and 16 have internal pull-up or pull-down resistors. These resistors define a
default operating state for this part. Pins 12 and 14 require an external resistor for proper operation.
INTERNATIONAL MICROCIRCUITS,INC. 525 LOS COCHES ST.,
MILPITAS, CA 95035 408-263-6300, FAX 408-263-6571
http:/www.imicorp.com
Rev. 1.3
7/21/1999
Page 4 of 12
SG521/22/24/28
Spread Spectrum Clock Generator
Approved Product
Test Conditions: VDD=5.0V (+/-10%) , CL=15pF and TA=0 to 70°C unless otherwise specified
Timing Electrical Characteristics
Symbol
Characteristic
Min.
Typ.
Max.
Unit
Conditions
Find
Reference Frequency, delta
TBD
TBD
%
OSCin = 14.318, 44.24 and 48 MHz
Fout
Tr
Tf
Tr
Tf
PRdty
MPdty
PRccj
MPccj
PRccj
MPccj
Frequency, Output
Rise Time, PRCLK,
Fall Time, PRCLK
Rise Time, MPCLK
Fall Time, MPCLK
10
250
200
450
300
45
-
-
-
-
-
50
50
-
-
-
120
500
300
650
400
55
MHz
ps
ps
ps
ps
%
PRCLK
Measured at 0.4 – 2.4V, @50.00 MHz
Measured at 0.4 – 2.4V, @50.00 MHz
Measured at 0.4 – 2.4V, @50.00 MHz
Measured at 0.4 – 2.4V, @50.00 MHz
Measured at 1.5 Volts
Duty Cycle, PRCLK
Duty Cycle, MPCLK
45
55
%
Measured at 1.5 Volts
Spread Off @ 50.0 MHz
Spread Off
Spread On @ 50.0 MHz
Spread On.
Jitter, Cycle to Cycle, PRCLK
Jitter, Cycle to Cycle, MPCLK
Jitter, Cycle to Cycle, PRCLK
Jitter, Cycle to Cycle, MPCLK
100
100
100
100
250
250
250
250
ps
ps
ps
ps
-
Notes:
** Modulation is turned off for these measurements.
Crystal Selection Truth Table
The SG521, 2, 4 and 8 uses one of three different reference frequencies. Determine the desired PRCLK frequency
from the frequency selection tables in table 5 – 8. Determine the REQUIRED REFERENCE FREQUENCY,
MPCLK and Product from table 1 and set S2, S3 and S4 control lines as indicated. Note that MPCLK/S3 and
PRCLK/S2 are bi-directional signals and serve as an input control line during power up and an output after power is
stable.
PRODUCT
REQUIRED
REF. Input
(MHz)
MPCLK OUT
(MHz)
S4
(Pin 5)
MPCLK/S3
(Pin 14)
PRCLK/S2
(Pin 12)
(Pin 14)
SG528
44.240
48.000
14.318
48.000
44.240
44.240
14.318
14.318
48.000
44.240
3.7 (44.24/12)
48.000
0
0
0
0
0
1
1
1
1
1
0
0
0
1
1
0
0
0
1
1
0
0
1
0
1
0
0
1
0
1
SG521/22/24
SG521/22/24/28
SG521/22/24/28
SG521/22/24/28
SG528
SG521/22/24
SG521/22/24/28
SG521/22/24/28
SG521/22/24/28
48.000
48.000
3.7 (44.24/12)
11.6 (44.24/4)
48.000
48.000
48.000
11.6 (44.24/4)
Table. 1
INTERNATIONAL MICROCIRCUITS,INC. 525 LOS COCHES ST.,
MILPITAS, CA 95035 408-263-6300, FAX 408-263-6571
http:/www.imicorp.com
Rev. 1.3
7/21/1999
Page 5 of 12
SG521/22/24/28
Spread Spectrum Clock Generator
Approved Product
SG521 Frequency and Spread Selection Truth Table
TEST "0" MPCLK(S3) PRCLK(S2) "1" SS_SEL
S4
S1
S0
Ref.
(MHz)
PRCLK
(MHz)
SPREAD
"1"
"1"
"1"
"0"
"0"
1.00%
3.00%
0
0
0
0
0
0
0
0
0
0
0
0
X
X
X
X
X
X
X
X
0
0
1
1
0
1
0
1
44.24
44.24
44.24
44.24
16.685345
40.044828
25.028017
30.033621
•
•
•
•
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
14.318
14.318
14.318
14.318
14.318
14.318
14.318
14.318
48
48
48
48
48
10.001544
20.003088
25.003860
50.007721
10.001544
20.003088
25.003860
50.007721
10.000000
20.000000
25.000000
50.000000
10.000000
20.000000
25.000000
50.000000
10.011207
20.022414
25.028017
50.056034
10.011207
20.022414
25.028017
50.056034
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
48
48
48
44.24
44.24
44.24
44.24
44.24
44.24
44.24
44.24
•
•
•
•
•
•
•
•
1
1
1
1
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
0
0
1
1
0
1
0
1
N/A
N/A
N/A
N/A
0 (PD)
1 (PD)
TEST
Hi-Z
N/A
N/A
N/A
N/A
Table 2.
INTERNATIONAL MICROCIRCUITS,INC. 525 LOS COCHES ST.,
MILPITAS, CA 95035 408-263-6300, FAX 408-263-6571
http:/www.imicorp.com
Rev. 1.3
7/21/1999
Page 6 of 12
SG521/22/24/28
Spread Spectrum Clock Generator
Approved Product
SG522 Frequency and Spread Selection Truth Table
TEST "0" MPCLK(S3) PRCLK(S2) "1" SS_SEL
S4
S1
S0
XTAL In
PRCLK (MHz)
SPREAD
3.00%
"1"
"1"
"1"
"0" "0"
1.00%
0
0
0
0
0
0
0
0
0
0
0
0
X
X
X
X
X
X
X
X
0
0
1
1
0
1
0
1
44.24
44.24
44.24
44.24
16.685345
40.044828
25.028017
30.033621
•
•
•
•
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
14.318
14.318
14.318
14.318
14.318
14.318
14.318
14.318
48
48
48
48
48
12.001853
16.669240
33.338480
40.006176
12.001853
16.669240
33.338480
40.006176
12.000000
16.666667
33.333333
40.000000
12.000000
16.666667
33.333333
40.000000
12.013448
16.685345
33.370690
40.044828
12.013448
16.685345
33.370690
40.044828
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
48
48
48
44.24
44.24
44.24
44.24
44.24
44.24
44.24
44.24
•
•
•
•
•
•
•
•
1
1
1
1
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
0
0
1
1
0
1
0
1
N/A
N/A
N/A
N/A
0 (PD)
1 (PD)
TEST
Hi-Z
N/A
N/A
N/A
N/A
Table 3.
INTERNATIONAL MICROCIRCUITS,INC. 525 LOS COCHES ST.,
MILPITAS, CA 95035 408-263-6300, FAX 408-263-6571
http:/www.imicorp.com
Rev. 1.3
7/21/1999
Page 7 of 12
SG521/22/24/28
Spread Spectrum Clock Generator
Approved Product
SG524 Frequency and Spread Selection Truth Table
TEST "0" MPCLK(S3) PRCLK(S2) "1" SS_SEL
S4
S1
S0
XIN
PRCLK (MHz)
SPREAD
3.00%
"1"
"1"
"1"
"0" "0"
1.00%
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
48
48
48
24.000000
32.000000
48.000000
96.000000
24.003706
32.004941
48.007412
96.014824
24.000000
32.000000
48.000000
96.000000
24.003706
32.004941
48.007412
96.014824
•
•
•
•
•
•
•
•
48
14.318
14.318
14.318
14.318
48
48
48
48
14.318
14.318
14.318
14.318
•
•
•
•
•
•
•
•
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
14.318
14.318
14.318
14.318
14.318
14.318
14.318
14.318
48
48
48
48
48
50.007721
100.015441
60.009265
120.018529
50.007721
100.015441
60.009265
120.018529
50.000000
100.000000
60.000000
120.000000
50.000000
100.000000
60.000000
120.000000
50.056034
100.112069
60.067241
120.134483
50.056034
100.112069
60.067241
120.134483
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
48
48
48
44.24
44.24
44.24
44.24
44.24
44.24
44.24
44.24
•
•
•
•
•
•
•
•
1
1
1
1
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
0
0
1
1
0
1
0
1
N/A
N/A
N/A
N/A
0 (PD)
1 (PD)
TEST
Hi-Z
N/A
N/A
N/A
N/A
Table 4.
INTERNATIONAL MICROCIRCUITS,INC. 525 LOS COCHES ST.,
MILPITAS, CA 95035 408-263-6300, FAX 408-263-6571
http:/www.imicorp.com
Rev. 1.3
7/21/1999
Page 8 of 12
SG521/22/24/28
Spread Spectrum Clock Generator
Approved Product
SG528 Frequency and Spread Selection Truth Table
TEST "0" MPCLK(S3) PRCLK(S2) "1" SS_SEL
S4
S1
S0
XTAL In
PRCLK (MHz)
SPREAD
3.00%
"1"
"1"
"1"
"0" "0"
1.00%
0
0
0
0
0
0
0
0
0
0
0
0
X
X
X
X
X
X
X
X
0
0
1
1
0
1
0
1
44.24
44.24
44.24
44.24
16.685345
40.044828
25.028017
30.033621
•
•
•
•
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
14.318
14.318
14.318
14.318
14.318
14.318
14.318
14.318
48
48
48
48
48
12.001853
16.669240
33.338480
40.006176
12.001853
16.669240
33.338480
40.006176
12.000000
16.666667
33.333333
40.000000
12.000000
16.666667
33.333333
40.000000
12.013448
16.685345
33.370690
40.044828
12.013448
16.685345
33.370690
40.044828
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
48
48
48
44.24
44.24
44.24
44.24
44.24
44.24
44.24
44.24
•
•
•
•
•
•
•
•
1
1
1
1
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
0
0
1
1
0
1
0
1
N/A
N/A
N/A
N/A
0 (PD)
1 (PD)
TEST
Hi-Z
N/A
N/A
N/A
N/A
Table 5.
INTERNATIONAL MICROCIRCUITS,INC. 525 LOS COCHES ST.,
MILPITAS, CA 95035 408-263-6300, FAX 408-263-6571
http:/www.imicorp.com
Rev. 1.3
7/21/1999
Page 9 of 12
SG521/22/24/28
Spread Spectrum Clock Generator
Approved Product
SG521 Application Schematic
VCC
R1
VDD
10
C1
C2
C3
22 uF.
VCC
15
VDD VDD VDD
0.1 uF.
0.1 uF.
1
6
R4
48.00 MHz
Non-modulated
U1
4.7 K
C4
R2
33
2
14
MPCLK
OSCin
MPCLK/S3
27pF.
C5
Y1
SG521
14.318 MHz
3
OSCout
R5
33
12
27 pF.
PRCLK
PRCLK/S2
VCC
R3
50.00 MHz
Modulated
4.7 K
5
7
8
10
9
S4
S0
S1
SS-SEL
SSON
* * *
VSS VSS VSS
TEST
16
* * * SS-SEL
4
11 13
VDD(High) = 3.00% Down Spread (Default)
VSS(Low ) = 1.00% Down Spread
Figure 2.
Application Schematic Notes:
The application schematic shown in figure 2 above is a typical wiring diagram of the SG521. As depicted in this
schematic, the SG521 will produce 48.00 MHz on the MPCLK output and a modulated 50.00 MHz on the PRCLK
output. Pin 10 controls the amount of modulation on PRCLK, pin 12. When SS-SEL is high, modulation is 3.00%
total spread and when SS-SEL is low, the total modulation is 1.00%.
Other considerations for this circuit is to insure that the power supply bypass capacitors, C2 and C3, are placed as
closed to their respective pins as possible. Also, be sure that the oscillator components, X1, C4 and C5, are placed
as close to pins 2 and 3 as possible.
Certain applications may require a separate island on the PCB for Power and Ground circuits for the SG521. This
is not a requirement, but will improve the immunity, which can directly effect the Phase detector and VCO within the
SG521.
INTERNATIONAL MICROCIRCUITS,INC. 525 LOS COCHES ST.,
MILPITAS, CA 95035 408-263-6300, FAX 408-263-6571
http:/www.imicorp.com
Rev. 1.3
7/21/1999
Page 10 of 12
SG521/22/24/28
Spread Spectrum Clock Generator
Approved Product
Package Drawing and Dimensions
a
16 Pin SOIC Dimensions
INCHES
MILLIMETERS
3
2
1
8
5
4
7
6
L
SYMBOL
A
MIN
NOM
MAX
MIN
2.46
NOM
2.56
MAX
h X 45 deg.
0.097
0.101
0.104
2.64
0.29
2.39
0.48
0.32
A1
A2
B
0.0050 0.009
0.0115
0.094
0.019
0.0125
0.412
0.299
0.127 0.22
E
H
0.090
0.014
0.0091
0.402
0.292
0.092
0.016
0.010
0.407
0.296
0.050 BSC
0.406
0.032
5º
2.29
0.35
0.23
2.34
0.41
0.25
C
D
E
9
11 12
15 16
C
13
10
14
10.21 10.34 10.46
A2
D
7.42
7.52
7.59
A2
A
e
0.127 BSC
B
e
H
L
0.400
0.024
0º
0.410
0.040
8º
10.16 10.31 10.41
0.61
0º
0.81
5º
1.02
8º
a
INTERNATIONAL MICROCIRCUITS,INC. 525 LOS COCHES ST.,
MILPITAS, CA 95035 408-263-6300, FAX 408-263-6571
http:/www.imicorp.com
Rev. 1.3
7/21/1999
Page 11 of 12
SG521/22/24/28
Spread Spectrum Clock Generator
Approved Product
Notes:
NOTICE
International Microcircuits, Inc. reserves the right to make changes to its products in order to improve design,
performance or reliability. International Microcircuits, Inc. assumes no responsibility for the use of its products in life
supporting and medical applications where the failure or malfunction of the product could cause failure of the life
supporting and medical systems. Products are not authorized for use in such applications unless a written approval
is requested by the manufacturer and an approval is given in writing by International Microcircuits, Inc. for the use
of its products in the life supporting and medical applications.
INTERNATIONAL MICROCIRCUITS,INC. 525 LOS COCHES ST.,
MILPITAS, CA 95035 408-263-6300, FAX 408-263-6571
http:/www.imicorp.com
Rev. 1.3
7/21/1999
Page 12 of 12
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