ICS951464 Datasheet, PDF (2/24 Pages) Integrated Device Technology – Programmable System Clock Chip for ATI RS/RD690 K8TM - based Systems

ICS951464
IDT^TM/ICST^M Programmable System Clock Chip for ATI RS/RD690 K8^TM - based Systems
Pin Description
PIN #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
PIN NAME
GNDREF
VDDREF
X1
X2
VDD48
48MHz_0
48MHz_1
GND48
SMBCLK
SMBDAT
RESET_IN#
SRCCLKT7
SRCCLKC7
VDDSRC
GNDSRC
SRCCLKT6
SRCCLKC6
SRCCLKT5
SRCCLKC5
SRCCLKT4
SRCCLKC4
GNDSRC
VDDSRC
SRCCLKT2
SRCCLKC2
VDDSRC
GNDSRC
28 *CLKREQB#
TYPE
PWR
PWR
IN
OUT
PWR
OUT
OUT
PWR
IN
I/O
IN
OUT
OUT
PWR
PWR
OUT
OUT
OUT
OUT
OUT
OUT
PWR
PWR
OUT
OUT
PWR
PWR
IN
DESCRIPTION
Ground pin for the REF outputs.
Ref, XTAL power supply, nominal 3.3V
Crystal input, Nominally 14.318MHz.
Crystal output, Nominally 14.318MHz
Power pin for the 48MHz output.3.3V
48MHz clock output.
48MHz clock output.
Ground pin for the 48MHz outputs
Clock pin of SMBUS circuitry, 5V tolerant
Data pin of SMBUS circuitry, 5V tolerant
Real time active low input. When active, SMBus is reset to power up default.
True clock of differential SRC clock pair.
Complement clock of differential SRC clock pair.
Supply for SRC clocks, 3.3V nominal
Ground pin for the SRC outputs
True clock of differential SRC clock pair.
Complement clock of differential SRC clock pair.
True clock of differential SRC clock pair.
Complement clock of differential SRC clock pair.
True clock of differential SRC clock pair.
Complement clock of differential SRC clock pair.
Ground pin for the SRC outputs
Supply for SRC clocks, 3.3V nominal
True clock of differential SRC clock pair.
Complement clock of differential SRC clock pair.
Supply for SRC clocks, 3.3V nominal
Ground pin for the SRC outputs
Output enable for PCI Express (SRC) outputs. SMBus selects which outputs are controlled.
0 = enabled, 1 = tri-stated
IDT^TM/ICST^M Programmable System Clock Chip for ATI RS/RD690 K8^TM - based Systems
2
1211B—09/17/09