2

AV9155

Pin Configuration

20-Pin DIP or SOIC

20-Pin DIP or SOIC

Pin Descriptions for AV 9155-01, 9155-02

PIN

NUM BER

PIN N AM E

TYPE

DESC RIPTIO N

1

1.843 M Hz

O utput

1.84 M Hz clock output.

2

X2

O utput

C rystal connection.

3

X1

Input

C rystal connection.

4

VDD

-

Digital power supply (3.3V or 5.0V).

5

GN D

-

Digital Ground.

6

16 M Hz/32 M Hz

O utput

16 M Hz (-01) or 32 M Hz (-02) clock output.

7

24 M Hz

O utput

24 M Hz floppy disk/combination I/O clock output.

8

12 M Hz

O utput

12 M Hz keyboard clock output.

9

AGN D

-

Analog ground (original version).

10

O E

Input

O utput enable. Tristates all outputs when low. (Has internal pull-up.)

11

FS2

Input

C PU clock frequency select #2. (Has internal pull-up.)

12

PD#

Input

Power-down. Shuts off entire chip when low. (Has internal pull-up.)

13

14.318 M Hz

O utput

14.318 M Hz reference clock output.

14

14.318 M Hz

O utput

14.318 M Hz reference clock output.

15

GN D

-

Digital ground.

16

VDD

-

Digital power supply (3.3V or 5.0V).

17

2XC PU

O utput

2X C P U clock output.

18

C PU

O utput

1X C PU clock output.

19

FS1

Input

C PU clock frequency select #1. (Has internal pull-up.)

20

FS0

Input

C PU clock frequency select #0. (Has internal pull-up.)