ICS9250-14 Datasheet, PDF (2/13 Pages) Integrated Circuit Systems – Frequency Timing Generator for Pentium II Systems

ICS9250 - 14
Preliminary Product Preview
Pin Descriptions
PIN
NUMBER
PIN NAME
1
REF1
2, 9, 10, 18, 25,
32, 37, 45
VDD
3
X1
4
5, 6, 14, 21,
28, 29, 36,
41, 49
7, 8
11
12
13, 15, 16,
17, 19, 20
X2
GND
3V66 (0;1)
PCICLK0¹
FS0
PCICLK1¹
FS1
PCICLK (2:7)
22
PD#
23
SCLK
24
SDATA
48MHz
34
FS3
35
38
26, 27, 30, 31,
39, 40, 42, 43,
44, 47, 48
50
FS2
24MHz
SDRAM_F
SDRAM (11:0)
GNDL
51, 52
CPUCLK (0:1)
53, 55
54
56
VDDL
IOAPIC
FS4
REF0¹
TYPE
DESCRIPTION
OUT 3.3V, 14.318MHz reference clock output.
PWR 3.3V power supply
IN
OUT
Crystal input, has internal load cap (33pF) and feedback
resistor from X2
Crystal output, nominally 14.318MHz. Has internal load
cap (33pF)
PWR Ground pins for 3.3V supply
OUT
OUT
IN
IN
IN
3.3V Fixed 66MHz clock outputs for HUB
3.3V PCI clock outputs, with Synchronous CPUCLKS
Logic input frequency select bit. Input latched at power on.
3.3V PCI clock outputs, with Synchronous CPUCLKS
Logic input frequency select bit. Input latched at power on.
OUT 3.3V PCI clock outputs, with Synchronous CPUCLKS
Asynchronous active low input pin used to power down the device into
IN
a low power state. The internal clocks are disabled and the VCO and
the crystal are stopped. The latency of the power down will not be
greater than 3ms.
IN Clock input of I²C input
IN Data input for I²C serial input.
OUT 3.3V Fixed 48MHz clock output for USB
IN Logic input frequency select bit. Input latched at power on.
IN Logic input frequency select bit. Input latched at power on.
OUT 3.3V fixed 24MHz output
OUT 3.3V free running 100MHz SDRAM not affected by I²C
OUT
3.3V output running 100MHz. All SDRAM outputs can be turned off
through I²C
PWR
OUT
PWR
OUT
IN
OUT
Ground for 2.5V power supply for CPU & APIC
2.5V Host bus clock output. 66MHz or 100MHz depending on FS
(0:1) pins Refer page 3.
2.5V power suypply for CPU, IOAPIC
2.5V clock outputs running at 16.67MHz.
Logic input frequency select bit. Input latched at power on.
3.3V, 14.318MHz reference clock output.
Note:
1. These pins will have 2X drive strength.
2