2

ICS9158-04

Pin Configuration

24-Pin SOIC

Pin Description

* Input pin has internal pull-up to VDD.

PIN NUMBER

PIN NAME

TYPE

DESCRIPTION

1

CLK1A

OUT

CPU clock output.

2

X2

OUT

Crystal connection output, which includes output crystal load capacitance.

3X1

IN

Crystal connection input, which includes crystal load capacitance and

feedback bias for a nominal 14.31818 MHz parallel-resonance 12pF crystal.

4

VDD

PWR

Digital POWER SUPPLY.

5

GND

PWR

Digital GROUND.

6

CLK1B

OUT

CPU clock output.

7

CLK1C

OUT

CPU clock output.

8

CLK1D

OUT

CPU clock output.

9

AGND

PWR

ANALOG GROUND.

10

OE

IN

OUTPUT ENABLE. Tristates all outputs when low.*

11

CLK2E

OUT

2X CPU clock output.

12

GND

PWR

Digital GROUND.

13

CLK12

OUT

CPU clock output.

14

CLK1E

OUT

CPU clock output.

15

FS2

OUT

CPU clock frequency select 2.*

16

AVDD

PWR

ANALOG power supply.

17

CLK2D

OUT

2X CPU clock output.

18

CLK2C

OUT

2X CPU clock output.

19

GND

PWR

Digital GROUND.

20

VDD

PWR

Digital POWER SUPPLY.

21

CLK2B

OUT

2X CPU clock output.

22

CLK2A

OUT

2X CPU clock output.

23

FS1

IN

CPU clock frequency select #1.*

24

FS0

IN

CPU clock frequency select #0.*