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HD74HC648 Datasheet Octal Bus Transceivers/registers

Manufacturer: Hitachi Semiconductor (now Renesas)

Overview: HD74HC646/HD74HC648 Octal Bus Transceivers/Registers with Multiplexed 3-state.

General Description

Six control inputs enable this device to be used as a latched transceiver, unlatched transceiver or a combination of both.

As a latched transceiver, data from one bus is stored for later retrieval by the other bus.

Alternately real time bus data (unlatched) may be directly transferred from one bus to another.

Key Features

  • High Speed Operation: tpd (Bus to Bus) = 14 ns typ (CL = 50 pF) High Output Current: Fanout of 15 LSTTL Loads Wide Operating Voltage: VCC = 2 to 6 V Low Input Current: 1 µA max Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C) HD74HC646/HD74HC648 Function Table Inputs Control G H H L L L L L L Clock Select Data I/O Data I/O Operation or Function HD74HC648 Isolation Store A & B data B real-time data to A bus B stored data to A bus.

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