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Octal Bus Transceiver with Bus Hold / 3 State Outputs

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The 74LVCH245A is an octal transceiver designed for asynchronous communication between data buses. The device transmits data from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the direction-control (DIR) input. The output-enable (OE) pin can be used to disable the device so the buses effectively are isolated.

The device is designed for operation with a power supply range of OE 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.

Bus hold circuitry holds unused or undriven inputs at a high or low logic state. The use of external pull-up or pull down resistors is not recommended.


  • Supply Voltage Range from 1.65V to 3.6V 
  • Sinks or Sources 24ma 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
    • ƒ Exceeds 200-V Machine Model (A115) 
    • ƒ Exceeds 2000-V Human Body Model (A114) 
    • ƒ Exceeds 1000-V Charged Device Model (C101) 
  • Latch-Up Exceeds 250mA per JESD 78, Class I 
  • All devices are:
    • ƒ Totally Lead-Free & Fully RoHS compliant  
    • ƒ 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 Bus Transceiver with Bus Hold / 3 State Outputs
Output Type 3-State

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