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74LS398 - QUAD 2-PORT REGISTER

General 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).

Key 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.

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📁 Similar Datasheet

Part Number Description Manufacturer
74LS390 Dual 4-Bit Decade Counter Fairchild Semiconductor
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74LS393 DUAL 4-BIT BINARY COUNTERS Hitachi Semiconductor
74LS399 QUADRUPLE 2-INPUT MULTIPLEXER Texas Instruments
74LS30 8-INPUT NAND GATE ON Semiconductor

Other Datasheets by Motorola Semiconductor (now NXP Semiconductors)

Part Number Description
74LS393 DUAL DECADE COUNTER
74LS395 4-BIT SHIFT REGISTER
74LS399 QUAD 2-PORT REGISTER
74LS322 8-BIT SHIFT REGISTERS
74LS33 QUAD 2-INPUT NOR BUFFER

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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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.