The SN74HCT645PW, manufactured by Texas Instruments, is a high-performance, octal bus transceiver and register designed for 4.5-V to 5.5-V VCC operation. It is a part of the HCT family, which is characterized by its high noise immunity and low power consumption. This integrated circuit is particularly suitable for driving bus lines or buffer memory address registers due to its bidirectional interface.

The device features eight D-type flip-flops and control circuitry that enable multiplexed transmission of data directly from the input bus or from the internal storage latches. Each byte has separate control inputs which can be shorted together for full 8-bit operation. The SN74HCT645PW operates as two 4-bit transceivers with separate output-enable signals, providing versatility in directional control.

Key Features

• Logic Type: Octal Bus Transceivers with 3-state outputs
• Operating Voltage: 4.5V to 5.5V
• IC Package Type: TSSOP
• Pin Count: 24
• Propagation Delay Time: 18ns at 4.5V
• Output Current: High/Low: -6mA/6mA
• Operating Temperature Range: -40°C to 85°C

The SN74HCT645PW is designed with the capability to drive up to 15 LSTTL loads, which provides a substantial margin for driving heavier loads. The 3-state outputs (bus driver outputs) can drive bus lines or buffer memory address registers with the high-impedance state effectively disconnecting the output from the bus.

As a reliable and versatile component, the SN74HCT645PW is highly regarded in the electronics industry for applications that require bidirectional data flow and buffering, especially in communication, computing, and digital systems. Its robust packaging and industry-standard pinout make it a practical choice for both new designs and as a drop-in replacement for existing systems.