SN74HCT623DW

Buffers, Drivers, Receivers, Transceivers Overview

The SN74HCT623DW 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 features low power consumption with a maximum ICC of 80 µA. The device provides typical propagation delays of 11 ns and supports ±6-mA output drive at 5 V. Inputs are TTL-voltage compatible with a maximum input current of 1 µA. It utilizes a 20-pin SOIC package and functions across a temperature range of -40°C to +85°C.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Dual-output-enable configuration allows asynchronous two-way communication between data buses or simultaneous bidirectional data transfer for lock bus-latch capability.
• High-current 3-state outputs can drive up to 15 LSTTL loads while maintaining true logic functionality.
• Low input current and low power consumption characteristics ensure efficient operation in standard TTL-compatible environments.

Buffers, Drivers, Receivers, Transceivers Applications

• Asynchronous two-way communication between data buses
• Bus latch applications requiring simultaneous bidirectional data storage
• TTL-to-CMOS interface circuits

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix 'DW' corresponds to the SOIC-20 package variant when sourcing. Confirm that the component meets RoHS compliance standards as indicated in the manufacturer's documentation. Ensure the operating environment remains within the specified -40°C to +85°C temperature range to maintain electrical performance specifications.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component for designs requiring octal bus transceivers with dual enable inputs for flexible timing control. The HCT logic series ensures compatibility with TTL voltage levels, making it suitable for mixed-logic systems. Consider the 20-pin SOIC package dimensions for PCB layout constraints and verify thermal management requirements for the specified operating conditions.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the SN54/74HCT623 family of octal bus transceivers. The 'SN74' prefix indicates commercial grade availability, while 'HCT' denotes High-speed CMOS technology compatible with TTL inputs. The '623' identifier specifies the octal bus transceiver function with 3-state outputs and dual enable capabilities.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

Direct substitutes include other SN74HCT623 variants such as the SN74HCT623N (PDIP package). Cross-family replacements require verifying pinout compatibility and ensuring equivalent electrical parameters like propagation delay and output drive strength match the original design requirements.

Buffers, Drivers, Receivers, Transceivers FAQ

How does the dual-enable configuration function?

The device features OEAB and OEBA inputs. Enabling both simultaneously allows data to flow from A to B and B to A, reinforcing inputs to store data on the buses if no other sources drive them.

What is the recommended handling for unused inputs during power-up?

To ensure a high-impedance state during power-up or power-down, OEBA should be tied to VCC through a pullup resistor and OEAB should be tied to GND through a pulldown resistor.