SN74HCT645N

Buffers, Drivers, Receivers, Transceivers Overview

The SN74HCT645N is an octal bus transceiver with 3-state outputs in a 20-pin PDIP package. It operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature range of -40°C to +85°C. The device features TTL-compatible inputs, low input current of 1 µA maximum, and high-current outputs capable of driving up to 15 LSTTL loads. Typical propagation delay is 14 ns at 5.5 V with 50 pF load, while maximum power consumption is 80 µA.

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 electrical isolation when the output-enable input is deactivated

Buffers, Drivers, Receivers, Transceivers Applications

• Asynchronous two-way communication between data buses
• Bus-oriented memory and register implementations
• Control logic for data flow management

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify that the ordering suffix 'N' corresponds specifically to the 20-lead Plastic Dual In-Line Package (PDIP). Confirm the active production status and RoHS compliance details directly from the manufacturer's latest documentation before finalizing procurement specifications.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when TTL-compatible inputs are required alongside CMOS performance characteristics. Ensure the application environment remains within the specified -40°C to +85°C temperature range and utilizes a 4.5 V to 5.5 V power supply for optimal operation.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the Texas Instruments HCT logic family, designed to bridge TTL and CMOS technologies. It serves as a standard octal bus transceiver solution for general-purpose digital systems requiring bidirectional data transfer capabilities with defined drive strengths.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74HC645N

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 A bus to the B bus, while a high level directs data from the B bus to the A bus.

What is the function of the OE input?

The output-enable (OE) input controls the 3-state outputs. When activated, it isolates the buses effectively by disabling the device outputs.