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SN54LS399 - QUAD 2-PORT REGISTER

Download the SN54LS399 datasheet PDF. This datasheet also covers the SN54LS398 variant, as both devices belong to the same quad 2-port register family and are provided as variant models within a single manufacturer datasheet.

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.
  • Select From Two Data Sources.
  • Fully Positive Edge-Triggered Operation.
  • Both True and Complemented Outputs on SN54/ 74LS398.
  • Input Clamp Diodes Limit High-Speed Termination Effects.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (SN54LS398_MotorolaInc.pdf) that lists specifications for multiple related part numbers.

📁 Similar Datasheet

Part Number Description Manufacturer
SN54LS399 QUADRUPLE 2-INPUT MULTIPLEXER Texas Instruments
SN54LS399J QUADRUPLE 2-INPUT MULTIPLEXER Texas Instruments
SN54LS390 DUAL DECADE COUNTER / DUAL 4-STAGE BINARY COUNTER Motorola Inc
SN54LS390 DUAL 4-BIT DECADE AND BINARY COUNTERS Texas Instruments
SN54LS393 DUAL 4-BIT DECADE AND BINARY COUNTERS Texas Instruments

Other Datasheets by Motorola Semiconductor (now NXP Semiconductors)

Part Number Description
SN54LS393 DUAL DECADE COUNTER / DUAL 4-STAGE BINARY COUNTER
SN54LS366A 3-STATE HEX BUFFERS
SN54LS367A 3-STATE HEX BUFFERS
SN54LS368A 3-STATE HEX BUFFERS
SN54LS374 OCTAL TRANSPARENT LATCH

Full PDF Text Transcription

Click to expand full text
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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