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3-State Octal Bus Transceiver IC - 74HC245

3-State Octal Bus Transceiver IC - 74HC245-Robocraze

3-State Octal Bus Transceiver IC - 74HC245

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  • Bi-Directional bus transceiver in a high-density 20-pin package 
  • 3-STATE outputs drive bus lines directly 
  • PNP inputs reduce DC loading on bus lines 
  • Hysteresis at bus inputs improve noise margins 
  • Typical propagation delay times, port-to-port 8 ns 
  • Typical enable/disable times 17 ns
  • IOL (sink current) 24 mA 
  • IOH (source current) −15 mA 

3-State Octal Bus Transceiver IC - 74HC245

The 74HC Series 74HC245 octal bus transceivers are designed for asynchronous two-way communication between data buses. The control function implementation minimizes external timing requirements. The device allows data transmission from the A Bus to the B Bus or from the B Bus to the A Bus depending upon the logic level at the direction control (DIR) input. The enable input (G) can be used to disable the device so that the buses are effectively isolated. 


Pinout Of 74HC245 IC

Pin Number

Pin Name



Direction Control (DIR)

This pin decides the direction of the Data.

2 to 9

Data Input/output (A0-A7)

These 8 pins can be used as 8-bit Input or 8-bit Output pins based on the state of DIR pin


Ground (GND)

Connected to the ground of the system 

11 to 18

Data Input/output (B0-B7)

These 8 pins can be used as 8-bit Input or 8-bit Output pins based on the state of DIR pin


Output Enable (OE)

Active Low pin – Used to Enable/Disable Input


Supply Voltage (Vcc)

Differential Analog input +. Connect to ADC input

Package Includes:

  • 1 x IC - 74HC245


Supply Voltage (VCC) 7 V
Input Voltage (VI) 7 V
Operating free-air temperature range 0°C to +70°C 
Storage temperature range –65°C to +150°C


1.What is the function of 74HC245?

  • The 74HC245 (74HCT245) is an 8-bit transceiver with three output states which is used for direction control, the device has output enable (OE) and send/receive (DIR) buttons. When OE is set to HIGH, the outputs enter a high-impedance OFF state. Clamp diodes are used as inputs.

2.What is 74HCT245?

  • The 74HC245 is an octal transceiver with non-inverting 3-state bus compatible send and receive outputs. The 74HC245 and 74HCT245 have an output enable input (OE) for simple cascading and a send/receive input (DIR) for direction control.