M74HC323 Datasheet PDF | STMicroelectronics

STMicroelectronics M74HC323

The M54/74HC299/323 are high speed CMOS 8BIT PIPO SHIFT REGISTERS (3-STATE) fabricated with silicon gate C2MOS technology. They achieve the high speed operation similar to equivalent LSTTL while maintaining the CMOS low power consumption.

Part No.	M74HC323
Datasheet	M74HC323 Download
Manufacturer	STMicroelectronics
Description	8-BIT PIPO SHIFT REGISTER
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DESCRIPTION

These devices have four modes (HOLD, SHIFT LEFT, SHIFT RIGHT and LOAD DATA). Each mode is chosen by two function select inputs (S0, S1). When one or both enable inputs, (G1, G2) are high, the eight input/output terminals are in the highimpedance state ; however sequential operation or clearing of the register is not affected. Clear function on the HC299 is asynchronous to CLOCK, while the HC323 is cleared synchronous to clock. All inputs are equipped with protection circuits against static discharge and transient excess voltage. October 1993 NC = No Internal Connection 1/15 M54/M74HC299/323 INPUT AND OUTPUT EQUIVALENT CIRCUIT TRUTH TABLE INPUTS MODE CLEAR L L L H H H H H H FUNCTION SELECTED S1 Z CLEAR HOLD SHIFT RIGHT SHIFT LEFT LOAD H L X L L L H H H S0 H X L L H H L L H OUTPUT CONTROL G1 * X L L L L L L L X G2 * X L L L L L L L X CLOCK (299) X X X X (323) INPUTS/OUTPUTS SERIAL SL X X X X X X H L X SR X X X X H L X X X Z L L QA0 H L QBn QBn a Z L L QH0 QGn QGn H L h L L L...