Texas Instruments SN74ABTR2245PWG4

Overview

SN74ABTR2245PWG4 from Texas Instruments is an octal transceiver with 3-state outputs, designed for asynchronous bidirectional data bus communication between A and B ports. It features integrated 25-Ω series output resistors, operates at 4.5–5.5 V, supports –40°C to 85°C temperature range, and provides high-impedance isolation during power-up/down - ideal for memory interface and board-level bus bridging applications.

For engineers reviewing the SN74ABTR2245PWG4 datasheet, SN74ABTR2245PWG4 pinout, SN74ABTR2245PWG4 application, or SN74ABTR2245PWG4 equivalent, key selection criteria include direction-control logic behavior, 12-mA drive capability per port, 3.4-ns typical propagation delay, and TSSOP-20 package compatibility with space-constrained PCB layouts.

Technical Context

This BiCMOS transceiver implements dual 8-bit bidirectional data paths controlled by DIR (direction) and OE (output enable) inputs. Its EPIC-II^B architecture enables low-power operation while maintaining TTL-compatible voltage thresholds (V_IL = 0.8 V, V_IH = 2.0 V) and robust 12-mA sink/source drive strength on both A and B ports.

The device guarantees high-impedance state when V_CC is below 2.1 V and supports safe hot-insertion via inherent power-up/down isolation. Output ground bounce (V_OLP) remains under 1 V at 5 V/25°C, and latch-up immunity exceeds 500 mA per JESD-17.

Key Specifications

Pinout & Package

TSSOP-20 (PW) package: 6.5 mm × 4.4 mm body, 0.65 mm lead pitch, 1.2 mm max height, JEDEC MO-153 compliant, RoHS-compliant NIPDAU lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC2245APW and SN74ABT2245N, the SN74ABTR2245PWG4 uniquely combines 5-V operation, integrated 25-Ω termination, and TSSOP-20 packaging - making it optimal for industrial bus bridging where signal integrity, voltage compatibility, and board space are jointly constrained.

Availability

SN74ABTR2245PWG4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory subsystems, and legacy peripheral adapters requiring stable component supply and long-term lifecycle support.

Supply support for SN74ABTR2245PWG4 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 leader specializing in analog, embedded processing, and logic solutions with over 50 years of innovation in industrial, automotive, and communications markets.

The ABTR2245 family was developed to provide robust, low-glitch bidirectional bus interfacing for industrial control and computing systems requiring guaranteed high-Z during power transitions and minimal external component count.

FAQ

What is the function of the DIR pin on the SN74ABTR2245PWG4?

The DIR (direction) pin on the SN74ABTR2245PWG4 controls real-time data flow direction: when DIR is low, data transfers from B bus to A bus; when DIR is high, data flows from A bus to B bus. This bidirectional control enables flexible bus arbitration without external multiplexing logic, and the pin accepts standard TTL voltage levels (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V). The SN74ABTR2245PWG4 relies on this single-pin control to eliminate the need for separate transmit/receive enable lines.

Does the SN74ABTR2245PWG4 require external series resistors on its I/O pins?

No, the SN74ABTR2245PWG4 does not require external series resistors because it integrates 25-Ω resistors on all A-port and B-port outputs. These on-die resistors reduce overshoot and undershoot on PCB traces up to 15 cm in length, directly supporting clean signal edges in memory and bus interface applications. This feature is confirmed in the device's functional description and electrical characteristics table, and eliminates two external components per I/O line - reducing BOM cost and layout complexity for the SN74ABTR2245PWG4.

What is the maximum operating temperature range for the SN74ABTR2245PWG4?

The SN74ABTR2245PWG4 is characterized for operation from –40°C to +85°C, meeting industrial-grade environmental requirements. This specification is explicitly stated in the recommended operating conditions table of the official datasheet (SCBS680A), and applies specifically to the SN74ABTR2245 variant - distinct from the military-grade SN54ABTR2245 (–55°C to +125°C). The SN74ABTR2245PWG4's thermal performance is further defined by its TSSOP-20 package θ_JA of 128°C/W, enabling reliable operation in enclosed industrial enclosures without forced airflow.

How does the SN74ABTR2245PWG4 behave during power-up and power-down sequences?

The SN74ABTR2245PWG4 enters a high-impedance state automatically when V_CC is between 0 V and 2.1 V, preventing bus contention during power ramp-up or brownout conditions. This behavior is intrinsic to the BiCMOS design and requires no external circuitry. However, to guarantee high-Z above 2.1 V, the OE pin must be pulled high via an external resistor - minimum value determined by driver sink capability. This dual-threshold isolation mechanism is a documented feature of the SN74ABTR2245PWG4 and critical for hot-swap and multi-rail system designs.

Can the SN74ABTR2245PWG4 be used in place of the SN74ABT2245N?

Yes, the SN74ABTR2245PWG4 is functionally identical to the SN74ABT2245N in electrical specifications, pinout, and logic behavior - differing only in package (TSSOP-20 vs. PDIP-20) and thermal characteristics. Both share the same ABTR2245 die, 4.5–5.5 V operation, ±12-mA drive, and integrated 25-Ω resistors. The SN74ABTR2245PWG4 offers superior board density and reflow compatibility, while the SN74ABT2245N suits through-hole prototyping. No schematic or firmware changes are needed when substituting the SN74ABTR2245PWG4 for SN74ABT2245N in existing designs.