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HD74HC648 - Octal Bus Transceivers/Registers

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.

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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Other Datasheets by Hitachi Semiconductor (now Renesas)

Part Number Description
HD74HC640 Octal Bus Transceivers
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HD74HC646 Octal Bus Transceivers/Registers
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Full PDF Text Transcription

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HD74HC646/HD74HC648 Octal Bus Transceivers/Registers with Multiplexed 3-state outputs 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. Circuit operation is determined by the Control G, Direction, Clock AB, Clock BA, Select AB, Select BA control inputs. The enable input, Contorl G, controls whether any bus outputs are enabled.
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