AV9155
Pin Configuration
20-Pin DIP or SOIC
20-Pin DIP or SOIC
Pin Descriptions for AV9155-23, -36
PIN
NUMBER
PIN
NAME
TYPE
DESCRIPTION
1
2
1.843/40 MHz
X2
Output
Output
Input
-
1.84 MHz (-23)/40 MHz SCSI (-36) clock output.
Crystal connection.
3
X1
Crystal connection.
4
VDD
Digital power supply (+5V)
5
GND
-
Digital ground.
6
16 MHz/15 MHz
24 MHz
12 MHz
AGND
OE
Output
Output
Output
-
16 MHz (-23)/15 MHz (-36) clock output.
24 MHz floppy disk/combination I/O clock output.
12 MHz keyboard clock output.
7
8
9
Analog ground (original version).
10
11
12
13
14
15
16
17
18
19
20
Input
Input
Input
Output
Output
-
Output enable. Tristates all outputs when low. (Has internal pull-up.)
CPU clock frequency select #2. (-23 has internal pull-up.)
Power-down. Shuts off entire chip when low. (Has internal pull-up.)
14.318 MHz reference clock output.
14.318 MHz reference clock output.
Digital ground.
FS2
PD#
14.318 MHz
14.318 MHz
GND
VDD
-
Digital power supply (3.3V or 5.0V).
2X CPU clock output.
2XCPU
CPU
Output
Output
Input
Input
1X CPU clock output.
FS1
CPU clock frequency select #1. (-23 has internal pull-up.)
CPU clock frequency select #0. (-23 has internal pull-up.)
FS0
4
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