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HD74HCT640

Hitachi Semiconductor
Part Number HD74HCT640
Manufacturer Hitachi Semiconductor
Description Octal Bus Transceivers (with 3-state outputs)
Published Mar 23, 2005
Detailed Description HD74HCT640/HD74HCT643 Octal Bus Transceivers (with 3-state outputs) Description Both the HD74HCT640 and the HD74HCT643 ...
Datasheet PDF File HD74HCT640 PDF File

HD74HCT640
HD74HCT640

Overview
HD74HCT640/HD74HCT643 Octal Bus Transceivers (with 3-state outputs) Description Both the HD74HCT640 and the HD74HCT643 have one active low enable input (G ), and a direction control (DIR).
When the DIR input is high, data flows from the A inputs to the B outputs.
When DIR is low, data flows from B to A.
The HD74HCT640 transfers inverted data from one bus to the other.
The HD74HCT643 transfers inverted data from the A bus to the B bus and non-inverted data from the B bus to the A bus.
Features • • • • • • LSTTL Output Logic Level Compatibility as well as CMOS Output Compatibility High Speed Operation: tpd (A to B) = 14.
5 ns typ (CL = 50 pF) High Output Current: Fanout of 15 LSTTL Loads Wide Operating Voltage: VCC = 4.
5 to 5.
5 V Low Input Current: 1 µA max Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C) Function Table Control Input G L L H DIR L H X Operation HD74HCT640 B data to A bus A data to B bus Isolation HD74HCT643 B data to A bus A data to B bus Isolation HD...


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