ICS9159C-14 Datasheet, PDF (2/7 Pages) Integrated Circuit Systems – Frequency Generator and Integrated Buffer for PENTIUM™

ICS9159C-14
Pin Descriptions
PIN
NUMBER
1, 26
PIN NAME
VDD
2
X1
3
4, 11, 17, 23
5
X2
VSS
TURBO
6, 7, 9, 10 PCLK(0:3)
8
VDD2
13, 12
14, 20
15, 16, 18
19, 21, 22
24
25
28, 27
FS(0:1)
VDD
BCLK(0:5)
DISK
USB
REF(0:1)
TYPE
PWR
IN
OUT
PWR
IN
OUT
PWR
IN
PWR
OUT
OUT
OUT
OUT
DESCRIPTION
Power for logic and fixed frequency output buffers.
XTAL or external reference frequency input. This input includes
XTAL load capacitance and feedback bias for a 12 - 16 MHz crystal,
nominally 14.31818 MHz.
XTAL output which includes XTAL load capacitance.
Ground
Speeds up the 60 and 66.6 MHz by 2.5% (see functionality table). It
has an internal pull-up resistor.
Processor clock outputs which are a multiple of the input reference
frequency as shown in the table above.
Power for PCLK output buffers only. This VDD supply can be reduced
to 2.5V for PCLK (0:3) outputs.
Frequency multiplier select pins. See table above. These inputs have
internal pull-up devices.
Power for BCLK output buffers.
Busclock outputs are fixed at one half the PCLK frequency.
The DISK controller clock is fixed at 24 MHz
(with 14.318 MHZ input)
The USB clock is fixed at 48 MHz (with 14.318 MHz input).
REF is a buffered copy of the crystal oscillator or reference input
clock, nominally 14.31818 MHz.
2