Texas Instruments SN74ABT244AMDBREP

Overview

SN74ABT244AMDBREP from Texas Instruments is an octal noninverting buffer/driver with 3-state outputs, designed for memory address driving, clock distribution, and bus interfacing in high-reliability systems. It features dual 4-bit channels, independent active-low output-enable (1OE, 2OE), ±24-mA/48-mA drive strength, and operation across –55°C to 125°C.

For engineers reviewing the SN74ABT244AMDBREP datasheet, SN74ABT244AMDBREP pinout, SN74ABT244AMDBREP application, or SN74ABT244AMDBREP equivalent, key selection criteria include military-temperature operation, SSOP-20 package compatibility, high-current 3-state bus driving capability, and EPIC-IIB™ BiCMOS logic family performance.

Technical Context

This device implements two independent 4-bit noninverting buffers, each controlled by a dedicated active-low OE input. Output enable logic follows standard TTL thresholds (VIL ≤ 0.8 V, VIH ≥ 2 V), and outputs enter high-impedance state when OE is high. The architecture supports hot-swap and bus-sharing applications via fast enable/disable timing (tPZH/tPHZ ≤ 5.6 ns typical at 25°C).

It uses Texas Instruments' EPIC-IIB™ BiCMOS process to achieve low power dissipation while delivering high drive: VOL ≤ 0.55 V at IOL = 48 mA and VOH ≥ 2.0 V at IOH = –24 mA under VCC = 4.5 V. Latch-up immunity exceeds 500 mA per JESD-17, and ESD protection meets MIL-STD-883 Class 3B (≥2000 V HBM).

Key Specifications

Pinout & Package

SN74ABT244AMDBREP is housed in a 20-pin Shrink Small-Outline Package (SSOP-DB), 7.4 mm × 5.3 mm body size, 0.65 mm lead pitch, and 2.0 mm max height per JEDEC MO-150. Pin 1 is located in Quadrant Q1 per tape-and-reel orientation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal 3-state buffer applications.

Compared with SN74ABT244ADBR and SN74LVC244APWR, the SN74ABT244AMDBREP uniquely delivers full military-temperature operation, enhanced reliability pedigree, and 5-V bus drive strength-making it irreplaceable in aerospace, defense, and harsh-environment industrial control.

Availability

SN74ABT244AMDBREP is available at Aetrix Electronics and suitable for aerospace flight computers, defense radar subsystems, and industrial programmable logic controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74ABT244AMDBREP 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 high-reliability logic solutions, with decades of heritage in military-qualified components.

The SN74ABT244AMDBREP belongs to TI's ABT logic family-engineered for high-speed, high-drive 5-V bus interface applications in mission-critical systems where signal integrity and environmental robustness are non-negotiable.

FAQ

What is the maximum output current specification for SN74ABT244AMDBREP?

The SN74ABT244AMDBREP supports a low-level output current (IOL) of up to 48 mA and a high-level output current (IOH) of –24 mA under recommended operating conditions (VCC = 4.5 V to 5.5 V). These values are measured per output and reflect its capability to drive heavy capacitive loads or multiple TTL inputs without external buffering. Exceeding these limits risks exceeding absolute maximum ratings and degrading reliability.

Does SN74ABT244AMDBREP support hot-swap or live-insertion applications?

Yes, SN74ABT244AMDBREP supports hot-swap use cases due to its guaranteed high-impedance state during power-up when OE is pulled high, combined with robust ESD protection (>2000 V HBM) and latch-up immunity (>500 mA). Its design includes internal circuitry that prevents false output states during VCC ramp-up, making it suitable for backplane and modular system applications where cards are inserted or removed under power.

What is the recommended power-up sequencing for SN74ABT244AMDBREP?

TI recommends tying both 1OE and 2OE to VCC through a pullup resistor (minimum value determined by driver sink capability) to ensure outputs remain in high-impedance until valid control signals are established. VCC should be applied before or concurrently with input signals; no strict sequencing between VCC and OE is required, but OE must not float. Decoupling capacitors (0.1 µF ceramic + 4.7 µF tantalum) are mandatory at the VCC pin.

Is SN74ABT244AMDBREP pin-compatible with other members of the SN74ABT244A family?

Yes, SN74ABT244AMDBREP shares identical pinout, function, and AC/DC specifications with all SN74ABT244A variants in the DB package-including SN74ABT244ADBR and SN74ABT244ANSR. Differences are limited to temperature grade, reliability screening, and packaging (tape-and-reel vs. rail), not electrical or mechanical interface. No PCB layout changes are needed when substituting within the DB package group.

What does the "-EP" suffix indicate in SN74ABT244AMDBREP?

The "-EP" suffix in SN74ABT244AMDBREP denotes Texas Instruments' Enhanced Product offering-signifying extended temperature qualification (–55°C to 125°C), enhanced manufacturing controls (single assembly/test site), DMS support, and qualification per MIL-PRF-38535 including HAST, temperature cycling, and bond intermetallic life testing. It is not a generic "enhanced" label but a defined TI product lineage with documented pedigree for high-reliability applications.