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SN54HCT646 Datasheet Octal Bus Transceivers-registers

Manufacturer: Texas Instruments

Overview: D Operating Voltage Range of 4.5 V to 5.5 V D Low Power Consumption, 80-µA Max ICC D Typical tpd = 12 ns D ±6-mA Output Drive at 5 V D Low Input Current of 1 µA Max D Inputs Are TTL-Voltage Compatible SN54HCT646 . . . JT OR W PACKAGE SN74HCT646 . . . DW OR NT PACKAGE (TOP VIEW) SN54HCT646, SN74HCT646 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS SCLS178C – MARCH 1984 – REVISED MARCH 2003 D Independent Registers for A and B Buses D Multiplexed Real-Time and Stored Data D True Data Paths D High-Current 3-State Outputs Can Drive Up To 15 LSTTL Loads SN54HCT646 . . .

General Description

/ordering information NC – No internal connection The ’HCT646 devices consist of bus-transceiver circuits with 3-state outputs, D-type flip-flops, and control circuitry arranged for multiplexed transmission of data directly from the input bus or from the internal registers.

Data on the A or B bus is clocked into the registers on the low-to-high transition of the appropriate clock (CLKAB or CLKBA) input.

Figure 1 illustrates the four fundamental bus-management functions that can be performed with the ’HCT646 devices.

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