Texas Instruments SN74ABT32245PZ

Overview

SN74ABT32245 from Texas Instruments is a 36-bit noninverting bus transceiver with 3-state outputs, designed for synchronous bidirectional data transfer between parallel buses in high-speed digital systems. It features quad 9-bit sections, ±32-mA/±64-mA drive strength, bus-hold inputs eliminating external pullups, and operates from –40°C to 85°C at 4.5–5.5 V.

For engineers reviewing the SN74ABT32245 datasheet, SN74ABT32245 pinout, SN74ABT32245 application, or SN74ABT32245 equivalent, key selection factors include direction-control logic per 9-bit section, OE-gated 3-state isolation timing (tPZH ≤ 7.3 ns), distributed V_CC/GND pinning for noise reduction, and compatibility with Widebus+™ system-level interconnect requirements.

Technical Context

The SN74ABT32245 implements four independent 9-bit transceiver sections, each with dedicated DIR and OE controls enabling flexible partitioning as one 36-bit, two 18-bit, or four 9-bit paths. Directional flow (A→B or B→A) is determined per section by DIR logic level, while OE independently enables/disables output drivers into high-impedance state.

Its EPIC-II^B™ BiCMOS process delivers low ground bounce (V_OLP < 0.8 V), latch-up immunity >500 mA per JESD-17, and fast propagation delays (t_PLH/t_PHL ≤ 5.0 ns at 5 V, CL = 50 pF). Bus-hold circuitry maintains valid logic levels on floating A/B port inputs without external components.

Key Specifications

Pinout & Package

Packaged in a 100-pin plastic thin quad flat (PZ) package with 14 × 14-mm body and 0.5-mm lead pitch; features distributed V_CC and GND pins across all four sides to suppress simultaneous switching noise.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ABT32245, the SN74ABT16245DGGR offers compact packaging but sacrifices section granularity and bus-hold; the SN74LVC16245ADGGR targets lower voltage rails and lacks 5-V tolerance, making neither a drop-in replacement-both require schematic and layout revision.

Availability

SN74ABT32245 is available at Aetrix Electronics and suitable for industrial automation, test instrumentation, and legacy computing infrastructure requiring stable component supply, long-term obsolescence management, and guaranteed 5-V TTL compatibility.

Supply support for SN74ABT32245 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The SN74ABT32245 belongs to TI's Widebus+™ family of high-speed bus interface ICs, engineered specifically for noise-immune, high-drive data routing in backplane, motherboard, and modular system architectures.

FAQ

What is the maximum operating temperature range for the SN74ABT32245?

The SN74ABT32245 is characterized for operation from –40°C to +85°C. This industrial temperature range ensures reliable performance in demanding environments such as factory automation controllers, telecom line cards, and test equipment enclosures where ambient temperatures exceed commercial limits. The SN74ABT32245 does not support the extended –55°C to +125°C range specified for the military-grade SN54ABT32245 variant.

Does the SN74ABT32245 require external pullup resistors on its data lines?

No, the SN74ABT32245 integrates active bus-hold circuitry on all A- and B-side data inputs, maintaining valid logic levels on floating or unterminated lines without external components. Each bus-hold input draws ±100 µA at VI = 0.8 V or 2 V, eliminating the need for discrete 10-kΩ pullup/pulldown resistors and simplifying PCB layout for the SN74ABT32245 in high-density systems.

How is directional control implemented in the SN74ABT32245?

The SN74ABT32245 provides four independent direction-control inputs (1DIR–4DIR), one per 9-bit section. When DIR = H, data flows from A to B; when DIR = L, data flows from B to A. This per-section granularity allows mixed-direction operation-for example, 1A→1B and 2B→2A simultaneously-enabling flexible data routing not possible with single-DIR transceivers like the SN74ABT32245's simpler counterparts.

What is the purpose of the distributed VCC and GND pins on the SN74ABT32245 PZ package?

The SN74ABT32245 uses six V_CC and seven GND pins distributed across all four edges of its 100-pin PZ package to minimize simultaneous switching noise (SSN) and ground bounce. This layout reduces power delivery inductance, lowers V_OLP to <0.8 V at 5 V, and improves signal integrity in high-speed bus applications-key advantages confirmed in TI's EPIC-II^B™ BiCMOS design for the SN74ABT32245.

Can the SN74ABT32245 be used in hot-swap applications?

Yes-the SN74ABT32245 supports controlled hot-swap operation via its 3-state outputs and robust isolation specs: I_OZL/I_OZH ≤ ±10 µA ensures minimal leakage in disabled state, and I_off ≤ ±100 µA at V_CC = 0 V prevents back-driving. To ensure high-impedance during power-up, tie OE to V_CC through a pullup resistor; the SN74ABT32245's design inherently avoids bus contention during sequencing.