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Octal Buffer/Line Driver with 3 State Outputs

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The 74LVC240A provides two 4-bit buffers/drivers with separate output-enable (OE) inputs. When OE is low, the device passes data from the A inputs to the Y outputs. When OE is high, the outputs are in the high-impedance state.

The device is designed for operation with a power supply range of 1.65V to 3.6V.

The inputs are tolerant to 5.5V allowing this device to be used in a mixed voltage environment. The device is fully specified for partial power down applications using IOFF. The IOFF circuitry disables the output preventing damaging current backflow when the device is powered down.


  • Supply Voltage Range from 1.65V to 3.6V 
  • Sinks or Sources 24 ma at VCC = 3V 
  • CMOS Low Power Consumption 
  • IOFF Supports Partial -Power Down Operation 
  • Inputs or Outputs Accept up to 5.5V 
  • Inputs Can Be Driven by 3.3V or 5V Allowing for Mixed Voltage Applications 
  • Schmitt Trigger Action at All Inputs 
  • Typical VOLP (Quiet Output Ground Bounce) Less than 0.8V with VCC = 3.3V and TA = +25°C 
  • Typical VOHV (Quiet Output dynamic VOH) Greater than 2.0V with VCC = 3.3V and TA = +25°C 
  • ESD Protection Tested per JESD 22
    • Exceeds 200-V Machine Model (A115) 
    • Exceeds 2000-V Human Body Model (A114) 
    • Exceeds 1000-V Charged Device Model (C101) 
  • Latch-Up Exceeds 250mA per JESD 78, Class I 
  • All devices are:
    • Totally Lead-Free & Fully RoHS compliant 
    • Halogen and Antimony Free.“Green” Device  


  • General Purpose Logic
  • Bus Driving
  • Power Down Signal Isolation
  • Wide Array of Products Such as:
    • PCs, Notebooks, Netbooks, Ultrabooks
    • Networking Computer Peripherals, Hard Drives, CD/DVD ROM
    • TV, DVD, DVR, Set Top Box

Product Specifications

Product Parameters

Number of Gates 8
Family LVC
VCC Min (V) 1.65 V
VCC Maximum Rating 3.6 V
tpd max @ (1.5V) - ns
tpd max @ 1.8V (ns) 12.7 ns
tpd max @ 2.5V (ns) 8.3 ns
tpd max @ 3.3V (ns) 6.3 ns
tpd max @ 5.0V (ns) - ns
Input/ Output Current 24
Description Octal Buffer/Line Driver with 3 State Outputs
Output Type 3-State

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