M74HC651 Datasheet PDF | STMicroelectronics

STMicroelectronics M74HC651

The truth table for HC651 is the same as this, but with the outputs inverted) GAB GBA CAB CBA SAB SBA X L H X X X X X A INPUTS Z INPUTS B INPUTS Z INPUTS FUNCTION Both the A bus and the B bus are inputs The output functions of the A and B bus are disabled Both the A and B buz are used for inputs to the internal flip-flops. The data of the B bus are stored to the internal flip-flop on low to high transition of th clock pulse The data stored to the internal flip-flop are dispayed at the A bus The data at the B bus are stored to the internal flipflop on low to high transition of the clock pulse.

Part No.	M74HC651
Datasheet	M74HC651 Download
Manufacturer	STMicroelectronics
Description	HC652 OCTAL BUS TRANSCEIVER/REGISTER
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DESCRIPTION

M74HC651/652 are high speed CMOS OCTAL BUS TRANSCEIVERS AND REGISTERS (32 STATE), fabricated in silicon gate C MOS technology. They have the same high speed performance of LSTTL combined with true CMOS low power consumption. These devices consist of bus transceiver circuits, D-type flip-flops, and control circuitry arranged for multiplexed transmission of data directly from the input bus or from the internal storage registers. Enable GAB and GBA are provided to control the transceiver functions. Select AB and Select BA control pins are provided to select whether real-time or stored data is transfered. A low input level selects real-time data, and a high selects stored data. Data on the A or B bus, or both, can be stored in the internal D flip-flops by low-to-high transitions at the appropriate clock pins (CLOCK AB or CLOCK BA) regardless of the select or enable control pins. When select AB and select BA are in the real-time transfer mode, it is also possible to store data without using the internal D-type flip-flops by simultaneously enabling GAB and GBA.