SN74HCT645PW

Buffers, Drivers, Receivers, Transceivers Overview

The SN74HCT645PW is an octal bus transceiver with 3-state outputs manufactured by Texas Instruments. It operates within a supply voltage range of 4.5 V to 5.5 V and supports a temperature range of -40°C to 85°C. The device features high-current outputs capable of driving up to 15 LSTTL loads, with ±6-mA output drive at 5 V. Typical propagation delay is 14 ns, and maximum input current is 1 µA. Inputs are TTL-voltage compatible.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Provides asynchronous two-way communication between data buses via direction control
• Features high-current 3-state outputs for driving multiple LSTTL loads
• Ensures low power consumption with minimal supply current draw
• Maintains isolation between buses when the output-enable input is deactivated

Buffers, Drivers, Receivers, Transceivers Applications

• Asynchronous two-way communication between data buses
• Bus-oriented transfers in microprocessor systems
• Circuits requiring controlled data flow directionality

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix 'PW' corresponds to the TSSOP-20 package configuration. Confirm that the active production status aligns with long-term availability requirements. Ensure the operating temperature range meets environmental specifications. Validate RoHS compliance and lead finish details against project constraints.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when TTL-compatible inputs are required alongside CMOS performance characteristics. The HCT logic family ensures compatibility with standard TTL logic levels while maintaining low static power consumption. Consider the TSSOP package dimensions for space-constrained printed circuit board layouts.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the SN74HCT series of octal bus transceivers. It shares functional similarities with other members like the SN74HC645 but utilizes HCT technology for improved TTL compatibility. The PW suffix designates the Thin Shrink Small Outline Package variant.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74HCT645DW (SOIC-20 package)

Buffers, Drivers, Receivers, Transceivers FAQ

How does the DIR input affect data transmission?

The DIR input determines the direction of data flow. A low level directs data from the B bus to the A bus, while a high level directs data from the A bus to the B bus.

What is the function of the OE input?

The output-enable (OE) input controls the state of the outputs. When activated, it isolates the buses effectively by placing the outputs in a high-impedance state.