ICS9LPRS480 Datasheet, PDF (1/25 Pages) Integrated Device Technology – Programmable System Clock Chip for ATI RS780 - K8TM based Systems

Integrated
Circuit
Systems, Inc.
ICS9LPRS480
Programmable System Clock Chip for ATI RS780 - K8^TM 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.