ICS9169C-27 Datasheet, PDF (2/8 Pages) Integrated Circuit Systems – Frequency Generator for Pentium Based Systems

ICS9169C-27
Pin Descriptions
PIN NUMBER
1
2
3
4,11,20,26
5
PIN NAME
VDD
X1
X2
GND
CPU(1)
FS0
TYPE
PWR
IN
OUT
PWR
OUT
IN
DESCRIPTION
Power for device logic.
XTAL or external reference frequency input. This input
includes XTAL load capacitance and feedback bias for a
12-16MHz crystal, nominally 14.31818MHz. External crystal
load of 30pF to GND recommended for VDD power on faster
than 2.0ms.
XTAL output which includes XTAL load capacitance.
External crystal load of 10pF to GND recommended for VDD
power on faster than 2.0ms.
Ground for device logic.
Processor clock output which is a multiple of the input
reference frequency.
Frequency multiplier select pins. See shared pin description.*
6,7,9,10,15,16,17,18,19
8
12
13
14
21,22,24,25,27,28
23
29
30
31
32
CPU
(2:5) (8:12)
VDDC1
CPU(6)
FS1
CPU(7)
FS2
VDDC2
BUS (6:1)
VDDB
VDDF
24MHz
48MHz
REF
BSEL
OUT
PWR
OUT
IN
OUT
IN
PWR
OUT
PWR
PWR
OUT
OUT
OUT
IN
Processor clock outputs which are a multiple of the input
reference frequency.
Power for CPU(1:6) output buffers only. Can be reduced VDD
for 2.5V (2.375-2.62V) next generation processor clocks.
Processor clock output which is a multiple of the input
reference frequency internal pull up devices.
Frequency multiplier select pin. See shared pin description.*
Processor clock output which is a multiple of the input
reference frequency internal pull up devices.
Frequency multiplier select pin. See shared pin description.*
Power for CPU PLL, logic and CPU(7:12)output buffers. Must
be nominal 3.3V (3.0 to 3.7V)
BUS clock outputs which are a multiple of the input
reference clock.
Power for BUS clock buffers BUS(1:6).
Power for fixed clock buffer (48 MHz, 24 Mhz).
Fixed 24MHz clock (assuming a 14.31818MHz REF
frequency).
Fixed 48MHz clock (assuming a 14.31818MHz REF
frequency).
Fixed 14.31818MHz clock (assuming a 14.31818MHz REF
frequency).
Selection for synchronous or asynchronous bus clock
operation. See shared pin programming description late in this
data sheet for further explanation.*
* Internal pull-up will vary from 350K to 500K based on temperature.
2