Texas Instruments 74ABTR2245DGVRE4

Overview

74ABTR2245DGVRE4 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 ±12 mA drive strength per I/O, and maintains high-impedance during power-up/down below 2.1 V. It is used in industrial backplane and memory interface applications requiring level translation and bus isolation.

For engineers reviewing the 74ABTR2245DGVRE4 datasheet, 74ABTR2245DGVRE4 pinout, 74ABTR2245DGVRE4 application, or 74ABTR2245DGVRE4 equivalent, key selection criteria include direction-control (DIR) and output-enable (OE) logic behavior, 25-Ω on-die termination, thermal performance in DGV package (θ_JA = 146°C/W), and compatibility with 5-V TTL/CMOS systems.

Technical Context

This device implements a dual-octet bidirectional transceiver architecture with independent DIR and OE controls: DIR selects data flow direction (A→B or B→A), while OE places both ports into high-impedance state. The EPIC-II^B BiCMOS process enables low power dissipation and robust latch-up immunity (>500 mA per JESD-17).

Each A- and B-port output includes a nominal 25-Ω series resistor to suppress overshoot/undershoot without external components. The device enters high-Z during V_CC ramping (0–2.1 V); above 2.1 V, OE must be actively pulled high via external resistor to guarantee isolation.

Key Specifications

Pinout & Package

74ABTR2245DGVRE4 uses a 20-pin Thin Very Small-Outline (DGV) package, 4.4 mm × 2.5 mm × 1.2 mm, with 0.5-mm pitch and gull-wing leads. Pin 1 is marked by a notch or dot in the top-left corner (Q1 quadrant per tape orientation).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC2245APWR and 74ACT245SCX, the 74ABTR2245DGVRE4 uniquely combines 5-V compatibility, on-die 25-Ω termination, and intrinsic power-ramp high-Z - making it optimal for industrial bus isolation where layout simplicity and sequencing robustness are prioritized over raw speed or voltage scaling.

Availability

74ABTR2245DGVRE4 is available at Aetrix Electronics and suitable for industrial backplane interfacing, memory expansion subsystems, legacy bus protocol translation, and test equipment signal routing requiring stable component supply and long-term lifecycle support.

Supply support for 74ABTR2245DGVRE4 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 decades of heritage in industrial-grade interface ICs.

The ABTR-series transceivers were developed specifically for robust 5-V bus isolation in harsh industrial environments, emphasizing power sequencing safety, ESD resilience, and reduced external component dependency.

FAQ

What is the function of the DIR pin on the 74ABTR2245DGVRE4?

The DIR (direction-control) pin on the 74ABTR2245DGVRE4 determines data flow direction: when DIR is LOW, data transfers from B-port to A-port; when DIR is HIGH, data flows from A-port to B-port. This bidirectional control enables flexible bus arbitration without external logic, and the pin accepts standard 5-V TTL input levels (V_IL ≤ 0.8 V, V_IH ≥ 2 V). The 74ABTR2245DGVRE4 relies solely on DIR and OE states to define operational mode per the published function table.

Does the 74ABTR2245DGVRE4 require external series resistors for signal integrity?

No, the 74ABTR2245DGVRE4 does not require external series resistors because each of its 16 I/O pins (A1–A8 and B1–B8) integrates a nominal 25-Ω series resistor. This on-die termination suppresses overshoot and undershoot on short-to-medium-length PCB traces, reducing component count and layout complexity. The 74ABTR2245DGVRE4's design explicitly eliminates the need for discrete 25-Ω resistors typically placed near connectors or stubs in bus architectures.

How does the 74ABTR2245DGVRE4 behave during power-up and power-down sequences?

The 74ABTR2245DGVRE4 automatically enters a high-impedance state when V_CC is between 0 V and 2.1 V, preventing bus contention during power ramping. Above 2.1 V, OE must be actively driven HIGH (e.g., via pullup resistor) to maintain isolation. This dual-threshold behavior is intrinsic to the device's BiCMOS structure and is documented in the recommended operating conditions table - a key differentiator of the 74ABTR2245DGVRE4 versus non-sequencing-aware transceivers.

What is the maximum continuous output current rating for the 74ABTR2245DGVRE4?

The 74ABTR2245DGVRE4 supports ±12 mA DC output current per I/O pin under recommended operating conditions (V_CC = 4.5–5.5 V, T_A = –40°C to +85°C). This rating applies to both sourcing (I_OH) and sinking (I_OL) modes and is validated across temperature and voltage extremes. Absolute maximum ratings allow up to ±30 mA per output, but sustained operation beyond ±12 mA may exceed thermal limits in the DGV package and is not guaranteed for reliability.

Is the 74ABTR2245DGVRE4 pin-compatible with other packages in the ABTR2245 family?

Yes, the 74ABTR2245DGVRE4 shares identical pinout and functionality with other SN74ABTR2245 variants in DW (SOIC), PW (TSSOP), and DB (SSOP) packages - all are 20-pin devices with DIR, OE, A1–A8, B1–B8, V_CC, and GND assigned to the same positions. Mechanical dimensions differ, but PCB footprint and signal routing remain interchangeable across these packages, enabling drop-in replacement based on thermal or density requirements without schematic or layout changes.