com90c66 Standard Microsystems Corp., com90c66 Datasheet - Page 7

• Manufacturer Part Number: com90c66
• Description: Arcnet Controller/transceiver With At Interface And On-chip Ram Corporation
• Manufacturer: Standard Microsystems Corp.

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