2

ICS9159C-14

Pin Descriptions

PIN

NUMBER

PIN NAME

TYPE

DESCRIPTION

1, 26

PWR

Power for logic and fixed frequency output buffers.

2X1

IN

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.

3

X2

OUT

XTAL output which includes XTAL load capacitance.

4, 11, 17, 23

PWR

Ground

5

TURBO

IN

Speeds up the 60 and 66.6 MHz by 2.5% (see functionality table). It

has an internal pull-up resistor.

6, 7, 9, 10

PCLK(0:3)

OUT

Processor clock outputs which are a multiple of the input reference

frequency as shown in the table above.

PWR

to 2.5V for PCLK (0:3) outputs.

13, 12

FS(0:1)

IN

Frequency multiplier select pins. See table above. These inputs have

internal pull-up devices.

14, 20

PWR

Power for BCLK output buffers.

15, 16, 18

19, 21, 22

BCLK(0:5)

OUT

Busclock outputs are fixed at one half the PCLK frequency.

24

DISK

OUT

The DISK controller clock is fixed at 24 MHz

(with 14.318 MHZ input)

25

USB

OUT

The USB clock is fixed at 48 MHz (with 14.318 MHz input).

28, 27

REF(0:1)

OUT

REF is a buffered copy of the crystal oscillator or reference input

clock, nominally 14.31818 MHz.