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ICS951413 Datasheet(PDF) 2 Page - Integrated Circuit Systems

Part No. ICS951413
Description  Programmable System Clock Chip for ATI RS400 P4-based Systems
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Maker  ICST [Integrated Circuit Systems]
Homepage  http://www.icst.com
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ICS951413 Datasheet(HTML) 2 Page - Integrated Circuit Systems

 
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2
Integrated
Circuit
Systems, Inc.
ICS951413
0929C—03/07/05
Pin Description
PIN #
PIN NAME
PIN
TYPE
DESCRIPTION
1
X1
IN
Crystal input, Nominally 14.318MHz.
2
X2
OUT Crystal output, Nominally 14.318MHz
3
VDD48
PWR Power pin for the 48MHz output.3.3V
4
USB_48MHz
OUT 48.00MHz USB clock
5
GND
PWR Ground pin.
6
VTT_PWRGD#/PD
IN
Vtt_PwrGd# is an active low input used to determine when latched inputs
are 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.
7
SCLK
IN
Clock pin of SMBus circuitry, 5V tolerant.
8
SDATA
I/O
Data pin for SMBus circuitry, 5V tolerant.
9
**FS_C
IN
Frequency select latch input pin
10
**CLKREQA#
IN
Dynamic Over Clocking pin: real time frequency selection 0: Normal; 1:
Frequency will transition to a preprogrammed value in the I2c. / Output
enable for PCI Express (SRC) outputs. SMBus selects which outputs are
controlled.
0 = enabled, 1 = tri-stated
11
**CLKREQB#
IN
Dynamic Over Clocking pin: real time frequency selection 0: Normal; 1:
Frequency will transition to a preprogrammed value in the I2c. / Output
enable for PCI Express (SRC) outputs. SMBus selects which outputs are
controlled.
0 = enabled, 1 = tri-stated
12
SRCCLKT7
OUT True clock of differential SRC clock pair.
13
SRCCLKC7
OUT Complement clock of differential SRC clock pair.
14
VDDSRC
PWR Supply for SRC clocks, 3.3V nominal
15
GNDSRC
PWR Ground pin for the SRC outputs
16
SRCCLKT6
OUT True clock of differential SRC clock pair.
17
SRCCLKC6
OUT Complement clock of differential SRC clock pair.
18
SRCCLKT5
OUT True clock of differential SRC clock pair.
19
SRCCLKC5
OUT Complement clock of differential SRC clock pair.
20
GNDSRC
PWR Ground pin for the SRC outputs
21
VDDSRC
PWR Supply for SRC clocks, 3.3V nominal
22
SRCCLKT4
OUT True clock of differential SRC clock pair.
23
SRCCLKC4
OUT Complement clock of differential SRC clock pair.
24
SRCCLKT3
OUT True clock of differential SRC clock pair.
25
SRCCLKC3
OUT Complement clock of differential SRC clock pair.
26
GNDSRC
PWR Ground pin for the SRC outputs
27
ATIGCLKT1
OUT True clock of differential SRC clock pair.
28
ATIGCLKC1
OUT Complementary clock of differential SRC clock pair.


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