ICS951411 Datasheet, PDF (2/19 Pages) Integrated Circuit Systems – System Clock Chip for ATI RS400 P4TM-based Systems

Integrated
Circuit
Systems, Inc.
ICS951411
Pin Description
PIN #
PIN NAME
1
X1
2
X2
3
VDD48
4
USB_48MHz
5
GND
6
VTT_PWRGD#/PD
7
SCLK
8
SDATA
9
**FS_C
10
**CLKREQA#
11
**CLKREQB#
12
SRCCLKT7
13
SRCCLKC7
14
VDDSRC
15
GNDSRC
16
SRCCLKT6
17
SRCCLKC6
18
SRCCLKT5
19
SRCCLKC5
20
GNDSRC
21
VDDSRC
22
SRCCLKT4
23
SRCCLKC4
24
SRCCLKT3
25
SRCCLKC3
26
GNDSRC
27
ATIGCLKT1
28
ATIGCLKC1
PIN
TYPE
DESCRIPTION
IN Crystal input, Nominally 14.318MHz.
OUT Crystal output, Nominally 14.318MHz
PWR Power pin for the 48MHz output.3.3V
OUT 48.00MHz USB clock
PWR Ground pin.
Vtt_PwrGd# is an active low input used to determine when latched inputs are
IN ^{ready to be sampled. PD is an asynchronous active high input pin used to put}
the device into a low power state. The internal clocks, PLLs and the crystal
oscillator are stopped.
IN Clock pin of SMBus circuitry, 5V tolerant.
I/O Data pin for SMBus circuitry, 5V tolerant.
IN Frequency select latch input pin
Output enable for PCI Express (SRC) outputs. SMBus selects which outputs
IN are controlled.
0 = enabled, 1 = tri-stated
Output enable for PCI Express (SRC) outputs. SMBus selects which outputs
IN are controlled.
0 = enabled, 1 = tri-stated
OUT True clock of differential SRC clock pair.
OUT Complement clock of differential SRC clock pair.
PWR Supply for SRC clocks, 3.3V nominal
PWR Ground pin for the SRC outputs
OUT True clock of differential SRC clock pair.
OUT Complement clock of differential SRC clock pair.
OUT True clock of differential SRC clock pair.
OUT Complement clock of differential SRC clock pair.
PWR Ground pin for the SRC outputs
PWR Supply for SRC clocks, 3.3V nominal
OUT True clock of differential SRC clock pair.
OUT Complement clock of differential SRC clock pair.
OUT True clock of differential SRC clock pair.
OUT Complement clock of differential SRC clock pair.
PWR Ground pin for the SRC outputs
OUT True clock of differential SRC clock pair.
OUT Complementary clock of differential SRC clock pair.
0891E—03/07/05
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