COM90C66 查看數據表（PDF） - SMSC -> Microchip

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COM90C66

ARCNET® Controller/Transceiver with AT® Interface and On-Chip RAM

SMSC -> Microchip 

PLCC

PIN NO.

NAME

33, 34 Crystal

Oscillator

59 CA Clock

58 Clock

1, 43

21, 68

60-61

Power Supply

Ground

No Connect

DESCRIPTION OF PIN FUNCTIONS

SYMBOL

XTAL1,

XTAL2

CACLK

CLK

Vcc

GND

NC

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

390Ω 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.

7

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