74LS174 Hex D-Type Flip-Flop with Clear


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. 74LS174 positive-edge-triggered flip-flops utilize TTL circuitry to implement D-type flip-flop logic. All have a direct clear input and the quad (175) versions feature complementary outputs from each flip-flop.

74LS174 Features

  • Six Positive Edge Triggered Flip-Flops with Single Rail Outputs
  • Buffered Clock and Direct Clear Inputs
  • Individual Data Input for each Flip-Flop
  • Can be used as Buffer Storage Registers
  • Standard TTL Switching Voltages

74LS174 Specifications

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

74LS174 Pinout Diagram

74LS174 Pin Description

Pin NoPin NameDescription
1CLR’Clear Pin (Active Low)
21QThe output of Flip Flop 1
31DInput Of Flip Flop 1
42DInput Of Flip Flop 2
52QThe output of Flip Flop 2
63DInput Of Flip Flop 3
73QThe output of Flip Flop 3
9CLKClock Pin
104QThe output of Flip Flop 4
114DInput Of Flip Flop 4
125QThe output of Flip Flop 5
135DInput Of Flip Flop 5
146DInput Of Flip Flop 6
156QThe output of Flip Flop 6
16VCCPositive Supply


  • Elimination switch
  • Data storage
  • Data transfer
  • Latch
  • Registers
  • Counters
  • Frequency division

74LS174 Alternative Equivalent


Download 74LS174 Hex D-Type Flip-Flop with Clear Datasheet from the link given below.