文档库 最新最全的文档下载
当前位置:文档库 › MC74AC640中文资料

MC74AC640中文资料

Octal Bidirectional Transceiver with 3?State Outputs

The MC74AC640/74ACT640 octal bus transceiver is designed for asynchronous two-way communication between data buses. The device transmits data from bus A to bus B when T/R = HIGH, or from bus B to bus A when T/R = LOW. The enable input can be used to disable the device so the buses are effectively isolated.?Bidirectional Data Path

?A and B Outputs Sink 24 mA/Source –24 mA ?′ACT640 Has TTL Compatible Inputs

V CC OE B 0B 1B 2B 3B 4B 5B 6B 7T/R

A 0

A 1

A 2

A 3

A 4

A 5

A 6

A 7

GND

PIN NAMES A 0–A 7Side A Inputs or 3-State Outputs OE Output Enable Input T/R Transmit/Receive Input

B 0–B 7

Side B Inputs or 3-State Outputs

H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial

associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer.

相关文档