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Integrated Device Technology Electronic Components Datasheet



ICS9LPRS480

Programmable System Clock Chip



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ICS9LPRS480 pdf
Integrated
Circuit
Systems, Inc.
ICS9LPRS480
Programmable System Clock Chip for ATI RS780 - K8TM based Systems
Recommended Application:
ATI RS780 systems using AMD K8 processors
Output Features:
• Integrated series resistors on all differential outputs.
• 1 - Greyhound compatible K8 CPU pairs
• 5 - low-power differential SRC pairs
• 2 - low-power differential chipset SouthBridge SRC pairs
• 1 - Selectable low-power differential 100MHz non-spread
SATA/ SRC output
• 1 - Selectable low-power differential SRC / 27MHz Single
Ended outputs
• 1 - Selectable HT3 100MHz low-power differential
hypertransport clock / HT66MHz Single Ended outputs
• 1 - 48MHz USB clock
• 3 - 14.318MHz Reference clock
• 2 - low-power differential ATIG pairs
• 5- Dedicated CLKREQ# pins
Key Specifications:
• CPU outputs cycle-to-cycle jitter < 150ps
• SRC outputs cycle-to-cycle jitter < 125ps
• SB_SRC outputs cycle-to-cycle jitter < 125ps
• +/- 100ppm frequency accuracy on CPU, SRC, ATIG
• 0ppm frequency accuracy on 48MHz
Features/Benefits:
• Power Saving Features:
Optional Separate supply rail for SRC low Voltage I/O
- ~33% power saving when 1.5V is used for this rail
• Spread Spectrum for EMI reduction
• Outputs may be disabled via SMBus
• External crystal load capacitors for maximum
frequency accuracy
Pin Configuration
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
GND48 1
SMBCLK 2
SMBDAT 3
VDD 4
SRC7C_LPRS/27MHz_NS 5
SRC7T_LPRS/27MHz_SS 6
GND 7
SRC4C_LPRS 8
SRC4T_LPRS 9
ICS9LPRS480
GNDSRC 10
VDDSRC_IO 11
SRC3C_LPRS 12
SRC3T_LPRS 13
SRC2C_LPRS 14
SRC2T_LPRS 15
VDDSRC 16
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
48 VDDCPU
47 VDDCPU_IO
46 GNDCPU
45 CLKREQ1#*
44 CLKREQ2#*
43 GNDSATA
42 SRC6T/SATAT_LPRS
41 SRC6C/SATAC_LPRS
40 VDDSATA
39 CLKREQ3#*
38 CLKREQ4#*
37 SB_SRC0T_LPRS
36 SB_SRC0C_LPRS
35 VDDSB_SRC
34 VDDSB_SRC_IO
33 GNDSB_SRC
1391D—02/02/09
*Other names and brands may be claimed as the property of others.
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ICS9LPRS480 pdf
Integrated
Circuit
Systems, Inc.
ICS9LPRS480
MLF Pin Description
PIN #
PIN NAME
1 GND48
2 SMBCLK
3 SMBDAT
4 VDD27
PIN TYPE
GND
IN
I/O
PWR
DESCRIPTION
Ground pin for the 48MHz outputs
Clock pin of SMBus circuitry, 5V tolerant.
Data pin for SMBus circuitry, 5V tolerant.
3.3V Power supply for SRC/27MHz output and 27MHz SS PLL
5 SRC7C_LPRS/27MHz_NS
OUT
True clock of low power differential SRC clock pair. (no 50ohm shunt resistor to GND and no 33
ohm series resistor needed)/27MHz 3.3V Single-ended non-spread output for discrete graphics
6 SRC7T_LPRS/27MHz_SS
7 GND27
8 SRC4C_LPRS
9 SRC4T_LPRS
10 GNDSRC
11 VDDSRC_IO
12 SRC3C_LPRS
13 SRC3T_LPRS
14 SRC2C_LPRS
15 SRC2T_LPRS
16 VDDSRC
17 VDDSRC_IO
18 GNDSRC
19 SRC1C_LPRS
20 SRC1T_LPRS
21 SRC0C_LPRS
22 SRC0T_LPRS
23 *CLKREQ0#
24 GNDATIG
25 VDDATIG_IO
26 VDDATIG
27 ATIG1C_LPRS
28 ATIG1T_LPRS
29 ATIG0C_LPRS
30 ATIG0T_LPRS
31 SB_SRC1C_LPRS
32 SB_SRC1T_LPRS
OUT
GND
OUT
OUT
GND
PWR
OUT
OUT
OUT
OUT
PWR
PWR
GND
OUT
OUT
OUT
OUT
IN
GND
PWR
PWR
OUT
OUT
OUT
OUT
OUT
OUT
Complement clock of low power differential SRC clock pair. (no 50ohm shunt resistor to GND
and no 33 ohm series resistor needed)/27MHz 3.3V Single-ended spreading output for discrete
graphics
Ground for the SRC/27MHz outputs
Complement clock of low power differential SRC clock pair. (no 50ohm shunt resistor to GND
and no 33 ohm series resistor needed)
True clock of low power differential SRC clock pair. (no 50ohm shunt resistor to GND and no 33
ohm series resistor needed)
Ground pin for the SRC outputs
Power supply for differential SRC outputs, nominal 1.05V to 3.3V
Complement clock of low power differential SRC clock pair. (no 50ohm shunt resistor to GND
and no 33 ohm series resistor needed)
True clock of low power differential SRC clock pair. (no 50ohm shunt resistor to GND and no 33
ohm series resistor needed)
Complement clock of low power differential SRC clock pair. (no 50ohm shunt resistor to GND
and no 33 ohm series resistor needed)
True clock of low power differential SRC clock pair. (no 50ohm shunt resistor to GND and no 33
ohm series resistor needed)
Supply for SRC core, 3.3V nominal
Power supply for differential SRC outputs, nominal 1.05V to 3.3V
Ground pin for the SRC outputs
Complement clock of low power differential SRC clock pair. (no 50ohm shunt resistor to GND
and no 33 ohm series resistor needed)
True clock of low power differential SRC clock pair. (no 50ohm shunt resistor to GND and no 33
ohm series resistor needed)
Complement clock of low power differential SRC clock pair. (no 50ohm shunt resistor to GND
and no 33 ohm series resistor needed)
True clock of low power differential SRC clock pair. (no 50ohm shunt resistor to GND and no 33
ohm series resistor needed)
Clock Request pin for SRC0 outputs. If output is selected for control, then that output is controlled
as follows:
0 = enabled, 1 = Low-Low
Ground pin for the ATIG outputs
Power supply for differential ATIG outputs, nominal 1.05V to 3.3V
Power supply for ATIG core, nominal 3.3V
Complementary clock of low-power differential push-pull PCI-Express pair with integrated series
resistor. (no 50ohm shunt resistor to GND and no 33 ohm series resistor needed)
True clock of low-power differential push-pull PCI-Express pair with integrated series resistor. (no
50ohm shunt resistor to GND and no 33 ohm series resistor needed)
Complementary clock of low-power differential push-pull PCI-Express pair with integrated series
resistor. (no 50ohm shunt resistor to GND and no 33 ohm series resistor needed)
True clock of low-power differential push-pull PCI-Express pair with integrated series resistor. (no
50ohm shunt resistor to GND and no 33 ohm series resistor needed)
Complement clock of low power differential Chipset-to-Chipset SRC clock pair. (no 50ohm shunt
resistor to GND and no 33 ohm series resistor needed
True clock of low power differential Chipset-to-Chipset SRC clock pair. (no 50ohm shunt resistor
to GND and no 33 ohm series resistor needed
1391D—02/02/09
2



Part Number ICS9LPRS480
Description Programmable System Clock Chip
Maker Integrated Device Technology - Integrated Device Technology
Total Page 25 Pages
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