74LS173 4-bit D-type Register Tri-state


The 74LS series of integrated circuits (ICs) was one of the most popular logic families of transistor-transistor logic (TTL) logic chips. 74LS series is a bipolar, low-power Schottky IC. The 74LS173A 4-bit registers include D-type flip-flops featuring totem-pole 3-state Outputs capable of driving highly capacitive or relatively low-impedance loads.

74LS173 Features

  • 3-State Outputs Interface Directly With System Bus
  • Gated Output-Control LInes for Enabling or Disabling the Outputs
  • Fully Independent Clock Virtually

74LS173 Specifications

Supply Voltage4.75 – 5.25Vdc
Maximum Clock Frequency40Mhz
Power Dissipation2mW/gate @100kHz
Minimum Output Current8mA
Propagation Delay10nS
Fan Out (TTL Loads)20

74LS173 Pinout Diagram

74LS173 Pin Description

Pin NoPin NameDescription
1OE1Output Enable (Active LOW) Inputs
2OE2Output Enable (Active LOW) Inputs
7CPClock Pulse (Active HIGH Going Edge)Input
9IE1Input Enable (Active LOW)
10IE2Input Enable (Active LOW)
11D3Data Input
12D2Data Input
13D1Data Input
14D0Data Input
15MRMaster Reset
16VCCPositive Supply

Download 74LS173 4-bit D-type Register Tri-state Datasheet from the link given below.