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PDF SG521 Data sheet ( Hoja de datos )
| Número de pieza | SG521 | |
| Descripción | Spread Spectrum Clock Generator | |
| Fabricantes | INTERNATIONAL MICROCIRCUITS | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SG521 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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Approved Product
Features
• Generates Spread Spectrum Clock (SSC)
• Programmable Frequencies from 10 to 120 MHz
• 1.25% and 3.25% 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
• 3 to 5V Operation Supply Range
• 16-Pin Plastic SOIC Package
SG521/22/24/28
Spread Spectrum Clock Generator
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
Benefits
• 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 1.25% or 3.25% 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. 2.0
5/25/2000
Page 1 of 12
1 page  
Approved Product
SG521/22/24/28
Spread Spectrum Clock Generator
Test Conditions: VDD=3.3/5.0 V (+/-10%) , CL=15pF and TA=0 to 70°C unless otherwise specified
Timing Electrical Characteristics
Symbol
Characteristic
Min. Typ. Max. Unit
Conditions
Find
Fout
Tr
Tf
Tr
Tf
PRdty
MPdty
PRccj
PRccj
PRccj
PRccj
PRccj
PRccj
PRccj
PRccj
Reference Frequency, delta
-10
+10 % OSCin = 14.318, 44.24 and 48 MHz
Frequency, Output
10 - 120 MHz
PRCLK
Rise Time, PRCLK,
250 -
500 ps Measured at 0.4 – 2.4V, @50.00 MHz
Fall Time, PRCLK
200 -
300 ps Measured at 0.4 – 2.4V, @50.00 MHz
Rise Time, MPCLK
450 -
650 ps Measured at 0.4 – 2.4V, @50.00 MHz
Fall Time, MPCLK
300 -
400 ps Measured at 0.4 – 2.4V, @50.00 MHz
Duty Cycle, PRCLK
45 50
55
%
Measured at 1.5 Volts
Duty Cycle, MPCLK
45 50
55
%
Measured at 1.5 Volts
Jitter, Cycle to Cycle, PRCLK
- 205 235
ps
3.30 VDC @ 50 MHz, Mod Off
Jitter, Cycle to Cycle, PRCLK
- 215 250
ps
3.30 VDC @ 50 MHz, Mod On
Jitter, Cycle to Cycle, PRCLK
- 216 250
ps
3.30 VDC @ 40 MHz, Mod Off
Jitter, Cycle to Cycle, PRCLK
- 281 325
ps
3.30 VDC @ 40 MHz, Mod On
Jitter, Cycle to Cycle, PRCLK
- 320 375
ps
5.0 VDC @ 50 MHz, Mod Off
Jitter, Cycle to Cycle, PRCLK
- 324 375
ps
5.0 VDC @ 50 MHz, Mod On
Jitter, Cycle to Cycle, PRCLK
- 191 225
ps
5.0 VDC @ 40 MHz, Mod Off
Jitter, Cycle, to Cycle, PRCLK
- 351 400
ps
5.0 VDC @ 40 MHz, Mod On
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
SG528
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
REQUIRED
REF. Input
(MHz)
44.240
48.000
14.318
48.000
44.240
44.240
14.318
14.318
48.000
44.240
MPCLK OUT
(MHz)
(Pin 14)
3.7 (44.24/12)
48.000
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)
S4
(Pin 5)
0
0
0
0
0
1
1
1
1
1
Table. 1
MPCLK/S3
(Pin 14)
0
0
0
1
1
0
0
0
1
1
PRCLK/S2
(Pin 12)
0
0
1
0
1
0
0
1
0
1
INTERNATIONAL MICROCIRCUITS,INC. 525 LOS COCHES ST.,
MILPITAS, CA 95035 408-263-6300, FAX 408-263-6571
http:/www.imicorp.com
Rev. 2.0
5/25/2000
Page 5 of 12
5 Page 
Approved Product
Package Drawing and Dimensions
EH
C
L
D
B
A2
A1
e
a
A
SG521/22/24/28
Spread Spectrum Clock Generator
16 Pin SOIC Outline Dimensions (300 mil)
INCHES
MILLIMETERS
SYMBOL MIN
NOM MAX
MIN NOM MAX
A
0.093
- 0.104 2.35
- 2.65
A1 0.004 - 0.012 0.10 - 0.30
A2 0.089
0.093 2.25
2.35
B
0.013
- 0.020 0.33
- 0.51
C
0.009
- 0.013 0.23
- 0.32
D 0.398 - 0.413 10.10 - 10.50
E
0.291
- 0.299 7.40
- 7.60
e 0.050 BSC
1.27 BSC
H 0.394 - 0.419 10.00 - 10.65
L
0.016
- 0.050 0.40
- 1.27
a 0º
- 8º 0º
- 8º
INTERNATIONAL MICROCIRCUITS,INC. 525 LOS COCHES ST.,
MILPITAS, CA 95035 408-263-6300, FAX 408-263-6571
http:/www.imicorp.com
Rev. 2.0
5/25/2000
Page 11 of 12
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet SG521.PDF ] | |
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