74ABT657D,623

Buffers, Drivers, Receivers, Transceivers Overview

The NXP USA Inc. 74ABT657D,623 is an octal transceiver featuring non-inverting buffers with 3-state outputs and an integrated 8-bit parity generator/checker. It operates within a supply voltage range of 4.5V to 5.5V. The device provides high output drive capability with guaranteed current sinking of 64mA and sourcing of -32mA. Propagation delays are specified between 1.1ns and 4.6ns depending on the signal path. It functions in ambient temperatures from -40°C to +85°C and utilizes a 24-lead SO plastic small outline package.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Integrates combinational functions including bidirectional data transfer and parity checking within a single package.
• Provides power-up 3-state functionality to prevent bus contention during initialization.
• Includes dedicated error output pin that indicates parity mismatch during receive mode operations.
• Offers latch-up protection exceeding 500 mA per JESD78B class II level A standards.

Buffers, Drivers, Receivers, Transceivers Applications

• Bus-oriented applications requiring bidirectional data flow control
• Systems utilizing parity generation for data integrity verification
• High-speed digital interfaces needing low static power dissipation

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix matches the required package variant, as the base part number covers multiple packages. Confirm the temperature grade corresponds to industrial requirements. Check current product status as availability may vary. Ensure ESD handling protocols are followed during assembly due to BiCMOS sensitivity.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when designing systems that require both octal bus transceiving and hardware-based parity checking without external logic. Consider the 3-state outputs for multi-driver bus architectures. Evaluate the propagation delay specifications against system timing constraints. Verify that the 24-lead SO package dimensions fit the target PCB layout.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the 74ABT series of high-performance BiCMOS logic components. It combines the speed advantages of ABT technology with the functional integration of parity circuits. The 74ABT657 serves as a specialized solution for reducing component count in complex digital designs compared to using separate transceivers and parity generators.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

Direct substitutes include other 74ABT657 variants such as the SSOP or TSSOP package versions if lead-free or space constraints differ. Cross-referencing with similar octal transceivers requires verifying parity functionality and electrical characteristics match the original design requirements.