ICS951412 Datasheet, PDF (3/19 Pages) Integrated Circuit Systems – System Clock Chip for ATI RS480 K8-based Systems

ICS951412
Pin Descriptions (Continued)
PIN _{PIN NAME}
#
29 ATIGCLKC0
30 ATIGCLKT0
31 GNDATI
32 VDDATI
33 SRCCLKC0
34 SRCCLKT0
35 VDDSRC
36 GNDSRC
TYPE
DESCRIPTION
OUT
OUT
PWR
PWR
OUT
OUT
PWR
PWR
Complementary clock of differential SRC clock pair.
True clock of differential SRC clock pair.
Ground for ATI Gclocks, nominal 3.3V
Power supply ATI Gclocks, nominal 3.3V
Complement clock of differential SRC clock pair.
True clock of differential SRC clock pair.
Supply for SRC clocks, 3.3V nominal
Ground pin for the SRC outputs
37 IREF
OUT
This pin establishes the reference current for the differential current-mode
output pairs. This pin requires a fixed precision resistor tied to ground in
order to establish the appropriate current. 475 ohms is the standard value.
38 GNDA
39 VDDA
40 CPUCLK8C1
41 CPUCLK8T1
42 GNDCPU
43 VDDCPU
44 CPUCLK8C0
45 CPUCLK8T0
46 GNDHTT
47 HTTCLK0
48 VDDHTT
49 GNDPCI
50 PCICLK0
51 VDDPCI
52 REF2
53 **FS1/REF1
54 **FS0/REF0
55 GND
56 VDDREF
PWR
PWR
OUT
OUT
PWR
PWR
OUT
OUT
PWR
OUT
PWR
PWR
OUT
PWR
OUT
I/O
I/O
PWR
PWR
Ground pin for the PLL core.
3.3V power for the PLL core.
Complementary clock of differential 3.3V push-pull K8 pair.
True clock of differential 3.3V push-pull K8 pair.
Ground pin for the CPU outputs
Supply for CPU clocks, 3.3V nominal
Complementary clock of differential 3.3V push-pull K8 pair.
True clock of differential 3.3V push-pull K8 pair.
Ground pin for the HTT outputs
3.3V Hyper Transport output
Supply for HTT clocks, nominal 3.3V.
Ground pin for the PCI outputs
PCI clock output.
Power supply for PCI clocks, nominal 3.3V
14.318 MHz reference clock.
Frequency select latch input pin / 14.318 MHz reference clock.
Frequency select latch input pin / 14.318 MHz reference clock.
Ground pin.
Ref, XTAL power supply, nominal 3.3V
0883G—12/08/04
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