SN74HC623NSR

Buffers, Drivers, Receivers, Transceivers Overview

The SN74HC623NSR is an octal bus transceiver from the Texas Instruments HC logic family, housed in a 20-pin SOP (SOIC) package. It operates within a supply voltage range of 2 V to 6 V and supports an operating temperature range of -40°C to +85°C. The device features high-current three-state outputs capable of driving up to 15 LSTTL loads, with output drive currents specified at ±6 mA at 5 V. Typical propagation delay is 8 ns, while maximum values reach 27 ns at 6 V with a 50 pF load. Quiescent current is limited to 80 µA maximum.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Dual-output-enable configuration allows asynchronous two-way communication between data buses or simultaneous bidirectional data storage.
• High-current three-state outputs provide robust drive capability for interfacing with heavy loads such as LSTTL circuits.
• Lock bus-latch capability enables data retention on both bus sets when all external sources are in a high-impedance state.

Buffers, Drivers, Receivers, Transceivers Applications

• Asynchronous two-way communication between parallel data buses
• Bidirectional data buffering and latching applications
• Bus-oriented memory and instrument control systems

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify that the ordering suffix NSR corresponds to the tape-and-reel packaging format rather than tube packaging. Confirm the specific revision level matches design requirements, as datasheet revisions may update electrical characteristics or pinout details. Ensure compatibility with the target PCB footprint dimensions for the SOP-20 package before finalizing procurement orders.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when designing systems requiring octal-width bidirectional data transfer with latch functionality. The HC series offers lower power consumption compared to older logic families while maintaining standard CMOS input levels. Verify that the 2 V to 6 V operating range aligns with the system's available supply rails and that the 20-pin SOP package fits the mechanical constraints of the enclosure.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the SN74HC623 family of octal bus transceivers manufactured by Texas Instruments. It is part of the broader 74HC logic series, which provides high-speed CMOS performance. The NSR suffix specifically denotes the surface-mount SOP variant supplied in tape-and-reel format for automated assembly processes.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74HC623DW

Buffers, Drivers, Receivers, Transceivers FAQ

How does the SN74HC623NSR achieve data storage?

Data storage is achieved by simultaneously enabling both OEAB and OEBA inputs. In this configuration, each output reinforces its input, allowing the device to latch the 8-bit codes present on the buses when external sources are high-impedance.

What is the function of the dual enable inputs?

The OEAB and OEBA inputs control the direction of data flow. Setting them to different logic levels enables transmission from one bus to the other, while setting them to the same level isolates the buses or enables bidirectional latching depending on the specific combination.