Texas Instruments SN74ABT16623DGGR

Overview

SN74ABT16623 from Texas Instruments is a 16-bit noninverting bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between two 16-bit buses (A↔B). It features dual output-enable controls (OEAB/OEBA), high-drive capability (–32 mA IOH / 64 mA IOL), distributed VCC/GND pins to suppress switching noise, and operates over –40°C to 85°C at 4.5–5.5 V supply. It is used in industrial backplane interfaces requiring robust bus isolation and latch-through data storage.

For engineers reviewing the SN74ABT16623 datasheet, SN74ABT16623 pinout, SN74ABT16623 application, or SN74ABT16623 equivalent, key selection considerations include its dual-enable bidirectional control logic, flow-through pinout for PCB layout optimization, ±100 µA max input leakage, 3.6 ns max tPHL propagation delay at 5 V, and compatibility with 5-V TTL/CMOS systems.

Technical Context

The SN74ABT16623 implements a true bidirectional transceiver architecture with independent OEAB (A-to-B enable) and OEBA (B-to-A enable) inputs, enabling four distinct operational modes per 8-bit section: isolation, unidirectional A→B, unidirectional B→A, or simultaneous bidirectional pass-through. Its EPIC-II^B BiCMOS process delivers low ground bounce (VOLP < 1 V) and latch-up immunity exceeding 500 mA per JESD-17.

Each of the two 8-bit sections operates autonomously: when both OEAB and OEBA are asserted, outputs reinforce their respective inputs-enabling transparent latching behavior without external feedback. The device supports hot-insertion via controlled power-up sequencing (OEBA pulled up, OEAB pulled down) and exhibits 8 pF typical I/O capacitance for high-speed signal integrity.

Key Specifications

Pinout & Package

SN74ABT16623 is packaged in a 48-pin Thin Shrink Small-Outline (DGG) package with 0.5-mm pitch, optimized for high-density PCB layouts and thermal performance (θJA = 89°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus transceiver applications.

Compared with SN74ABT16623, SN74LVC16623DGGR offers lower power but sacrifices 5-V compatibility and latch-up robustness, while 74ALVC16623PAG improves speed yet removes the unique dual-enable latching capability essential for glitch-free bus arbitration in industrial control.

Availability

SN74ABT16623 is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy bus bridging, modular data acquisition chassis, and redundant control plane interfaces requiring stable component supply and long-term lifecycle support.

Supply support for SN74ABT16623 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and logic solutions, with leadership in industrial, automotive, and communications markets.

The SN74ABT16623 belongs to TI's Widebus™ family of high-speed bus interface devices, engineered specifically for robust, noise-immune data transfer in industrial backplanes and legacy system upgrades.

FAQ

What is the operating voltage range for SN74ABT16623?

The SN74ABT16623 operates over a supply voltage range of 4.5 V to 5.5 V. This specification ensures compatibility with standard 5-V TTL logic families and provides sufficient margin against rail collapse in noisy industrial power environments. Operation outside this range may cause functional failure or permanent damage, as confirmed by absolute maximum ratings in the official datasheet.

How does the dual output-enable (OEAB/OEBA) logic work in SN74ABT16623?

In SN74ABT16623, OEAB (active-low) enables data flow from A to B, while OEBA (active-low) enables data flow from B to A. When both are low, bidirectional pass-through occurs; when both are high, all outputs enter high-impedance isolation. Critically, simultaneous low assertion also enables transparent latching - outputs reinforce their inputs, holding bus state without clocks or external feedback.

Can SN74ABT16623 be used in hot-swap applications?

Yes - SN74ABT16623 supports hot-insertion when OEBA is tied to VCC via a pullup resistor and OEAB is tied to GND via a pulldown resistor. This ensures all outputs remain in high-impedance during power-up/down transitions, preventing bus contention on live backplanes. The recommendation is explicitly documented in the TI datasheet SCBS211B.

What is the maximum propagation delay for SN74ABT16623 at 5 V?

The maximum propagation delay (tPHL or tPLH) for SN74ABT16623 is 3.6 ns at VCC = 5 V and TA = 25°C, measured under CL = 50 pF. This value applies to both A→B and B→A signal paths and is verified across the full industrial temperature range (–40°C to +85°C) per recommended operating conditions in the datasheet.

Does SN74ABT16623 have latch-up immunity, and what standard does it meet?

Yes - SN74ABT16623 exceeds 500 mA latch-up immunity per JEDEC Standard JESD-17. This performance is achieved through Texas Instruments' EPIC-II^B BiCMOS process and is explicitly stated in the device's datasheet SCBS211B, making it suitable for high-reliability industrial and telecom applications where ESD-induced latch-up must be avoided.