HD74HC646 Datasheet Octal Bus Transceivers/registers

Manufacturer: Hitachi Semiconductor (now Renesas)

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

Datasheet Details

Part number	HD74HC646
Manufacturer	Hitachi Semiconductor (now Renesas)
File Size	61.86 KB
Description	Octal Bus Transceivers/Registers
Datasheet	HD74HC646_HitachiSemiconductor.pdf

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

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.

Part Number	Description
HD74HC640	Octal Bus Transceivers
HD74HC643	Octal Bus Transceivers
HD74HC648	Octal Bus Transceivers/Registers
HD74HC620	Octal Bus Transceivers
HD74HC623	Octal Bus Transceivers
HD74HC651	Octal Bus Transceivers/Registers
HD74HC652	Octal Bus Transceivers/Registers
HD74HC668	Synchronous UP/Down Decade/4-bit binary Counter
HD74HC669	Synchronous UP/Down Decade/4-bit binary Counter
HD74HC670	4-by-4 Register