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SN54LS398 - QUAD 2-PORT REGISTER

Description

The SN54 / 74LS398 and SN54 / 74LS399 are high-speed Quad 2-Port Registers.

They select four bits of data from two sources (Ports) under the control of a common Select Input (S).

Features

  • both Q and Q inputs, while the SN54/ 74LS399 has only Q outputs. SN54/74LS398 SN54/74LS399 QUAD 2-PORT.

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📁 Similar Datasheet

Part Number Description Manufacturer
SN54LS390 DUAL 4-BIT DECADE AND BINARY COUNTERS Texas Instruments
SN54LS393 DUAL DECADE COUNTER / DUAL 4-STAGE BINARY COUNTER Motorola
SN54LS393 DUAL 4-BIT DECADE AND BINARY COUNTERS Texas Instruments
SN54LS399 QUADRUPLE 2-INPUT MULTIPLEXER Texas Instruments
SN54LS399 QUAD 2-PORT REGISTER Motorola

Other Datasheets by Motorola Semiconductor (now NXP Semiconductors)

Part Number Description
SN54LS390 DUAL DECADE COUNTER / DUAL 4-STAGE BINARY COUNTER
SN54LS395 4-BIT SHIFT REGISTER
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Full PDF Text Transcription

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QUAD 2-PORT REGISTER The SN54 / 74LS398 and SN54 / 74LS399 are Quad 2-Port Registers. They are the logical equivalent of a quad 2-input multiplexer followed by a quad 4-bit edge-triggered register. A Common Select input selects between two 4-bit input ports (data sources). The selected data is transferred to the output register on the LOW-to-HIGH transition of the Clock input. The SN54/ 74LS398 features both Q and Q inputs, while the SN54/ 74LS399 has only Q outputs.
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