HD74HC651 - Hitachi Semiconductor

HD74HC651 Octal Bus Transceivers/Registers

This device consists of bus transceiver circuits, D-type flip-flops, and control circuitry arranged for multiplexed transmission of data directly from the data bus or from the internal storage registers. Enable GAB and GBA are provided to cotrol the transceiver functions. Select AB and Select BA control pins are provided to select whether real-time or stored.

Features

•
•
•
•
• High Speed Operation: tpd (Bus to Bus) = 16 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) HD74HC651/HD74HC652 Function Table Real-Time Transfer Real-Time Transfer Bus B to Bus A Bus A to Bus B Storage Clock AB Select AB Enable GAB Clock BA Select BA Enable GBA X X L X L L X L H X X H X H X L Transfer Stored Data to A and/or B L or H H H L or H H L Bus A Bus A Bus B Real-time transfer Bus B to Bus A Real-time transfer Bus A to B.