SN74HC623NS

Buffers, Drivers, Receivers, Transceivers Overview

The SN74HC623NS is an octal bus transceiver in a 20-pin SOP package. It supports a wide operating voltage range of 2 V to 6 V and features high-current 3-state outputs capable of driving up to 15 LSTTL loads. The device provides low power consumption with a maximum ICC of 80 µA and typical propagation delay of 8 ns. It includes dual output-enable inputs (OEAB and OEBA) that allow asynchronous two-way communication between data buses or simultaneous bidirectional transfer for data storage.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Dual-output enable configuration allows flexible timing control for asynchronous two-way communication between data buses.
• Simultaneous enabling of both output enables reinforces input signals, allowing the device to store data when other sources are high-impedance.
• High-current 3-state outputs provide sufficient drive capability to interface directly with LSTTL loads.

Buffers, Drivers, Receivers, Transceivers Applications

• Asynchronous two-way communication between data buses
• Bus-oriented memory and logic applications requiring data storage
• Bidirectional data transmission systems

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix matches the required package type and tape-and-reel quantity. Confirm the temperature range aligns with system requirements, as the NS suffix indicates a -40°C to +85°C rating. Ensure unused inputs are tied to VCC or GND to prevent floating states. Cross-reference the manufacturer part number against official distributor catalogs to validate authenticity and current production status.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when designing systems requiring octal bus transceivers with independent direction control. The dual-enable architecture is suitable for applications needing temporary data latching on the bus without external registers. Consider the 2 V to 6 V supply range for compatibility with various logic families. Evaluate the 8 ns typical propagation delay against system clock speeds to ensure timing margins are met.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the Texas Instruments SN74HC series of high-speed CMOS logic products. It functions as an octal bus transceiver designed for general-purpose digital applications. The HC series offers wide voltage operation and low power consumption compared to older logic families. This specific model integrates unique bidirectional control capabilities within a standard 20-pin small-outline package.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74HC623N

Buffers, Drivers, Receivers, Transceivers FAQ

How does the SN74HC623NS store data?

Data is stored by simultaneously enabling both OEAB and OEBA inputs. In this configuration, each output reinforces its input, maintaining the last state of the bus lines when all other sources are in a high-impedance state.

What is the function of the OEAB and OEBA inputs?

These are independent output-enable inputs that control the direction of data flow. OEAB enables transmission from the B bus to the A bus, while OEBA enables transmission from the A bus to the B bus. Both can be disabled to isolate the buses.