DESCRIPTION OF PIN FUNCTIONS
PLCC
PIN NO.
33, 34
NAME
Crystal
Oscillator
SYMBOL
XTAL1,
XTAL2
DESCRIPTION
An external parallel resonant 20 MHz crystal should be
connected to these pins. If an external 20 MHz TTL clock
is used instead, it must be connected to XTAL1 with a
390
Ω
pull-up resistor and XTAL2 should be left floating.
Output. This is the start/stop CA clock and should be left
floating for typical operation.
Output. This is a general purpose 5 MHz clock and
should be left floating for typical operation.
+5 Volt Power Supply pin.
Ground pins.
Make no connection to these pins.
59
58
1, 43
21, 68
60-61
CA Clock
Clock
Power Supply
Ground
No Connect
CACLK
CLK
V
cc
GND
NC
7