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