74LS399 Datasheet PDF - Motorola QUAD 2-PORT REGISTER Specs

74LS399 - QUAD 2-PORT REGISTER

This page provides the datasheet information for the 74LS399, a member of the 74LS398 QUAD 2-PORT REGISTER family.

Datasheet Summary

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.

Datasheet Details

Part number	74LS399
Manufacturer	Motorola
File Size	78.79 KB
Description	QUAD 2-PORT REGISTER
Datasheet	74LS399 Datasheet
Additional preview pages of the 74LS399 datasheet.

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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.

Published: Apr 11, 2016 |