74LS126 Quad Bus Buffer 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. 74LS126 bus buffers feature three-state outputs that, when enabled, have the low impedance characteristics of a TTL output with additional drive capability at high logic levels to permit driving heavily loaded bus lines without external pullup resistors.

74LS126 Features

  • Four Independent Non-Inverting Buffer Gates
  • Enabled Mode
  • Fast Switching Times
  • Operating Temperature up to 70°C
  • Standard TTL Switching Voltages

74LS126 Specifications

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

74LS126 Pinout Diagram

74LS126 Pin Description

Pin NoPin NameDescription
11G, 1G*’LOW/High pin of Buffer 1
21AInput Of Buffer 1
31YOutput Of Buffer 1
42G,2G*’LOW/High pin of Buffer 2
52AInput Of Buffer 2
62YOutput Of Buffer 2
83YOutput Of Buffer 3
93AInput Of Buffer 3
103G,3G*’LOW/High pin of Buffer 3
114YOutput Of Buffer 4
124AInput Of Buffer 4
134G,4G*’LOW/High pin of Buffer 4
14VCCPositive Supply

74LS126 Circuit


  • digital buffer (or a voltage buffer) is an electronic circuit element used to isolate input from the output.

74LS126 Alternative Equivalent

74LS125, 74ls367

Download 74LS126 Quad Bus Buffer Tri-State Datasheet from the link given below.