Texas Instruments SN74ABT2240APWR

Overview

SN74ABT2240APWR from Texas Instruments is an octal noninverting buffer/line driver with 3-state outputs, designed for memory address and bus-oriented applications. It features two independent 4-bit sections with separate active-low output-enable (OE) inputs, 25-Ω integrated series output resistors, ±12 mA output drive, and operates over –40°C to 85°C at 4.5–5.5 V supply.

For engineers reviewing the SN74ABT2240APWR datasheet, SN74ABT2240APWR pinout, SN74ABT2240APWR application, or SN74ABT2240APWR equivalent, key selection considerations include its 20-pin TSSOP package, 3-state bus interface capability, low ground bounce (<1 V), latch-up immunity (>500 mA), and compatibility with 5-V TTL/CMOS systems requiring high fan-out and controlled edge rates.

Technical Context

This device implements a BiCMOS EPIC-II^B architecture to reduce power dissipation while maintaining TTL-compatible input thresholds and CMOS-level output swing. Each of the eight outputs is internally series-terminated with 25 Ω to suppress overshoot/undershoot without external components.

The dual 4-bit structure supports independent control via 1OE and 2OE pins, enabling selective bus isolation. Output enable logic is active-low and symmetrical; when OE is high, outputs enter high-impedance state - critical for hot-swap and shared-bus operation in industrial backplanes and memory subsystems.

Key Specifications

Pinout & Package

TSSOP-20 (PW) package: 6.5 mm × 4.4 mm, 0.65 mm pitch, 1.2 mm max height, lead-free NiPdAu finish, moisture sensitivity level 1 (260°C reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ABT2240APWR, SN74ABT2244APWR offers identical form-factor and performance but preserves input polarity, while SN74LVC244APWR trades 5-V compatibility and built-in termination for lower voltage operation and faster propagation - making each suitable only for distinct voltage-domain and signal-integrity requirements.

Availability

SN74ABT2240APWR is available at Aetrix Electronics and suitable for industrial control systems, memory subsystems, and legacy bus interface designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SN74ABT2240APWR 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 high-reliability interface ICs.

The ABT logic family - including SN74ABT2240APWR - was engineered for high-speed, low-noise 5-V bus interfacing in mission-critical computing and industrial equipment, emphasizing signal integrity, latch-up immunity, and thermal robustness.

FAQ

What is the function of the 1OE and 2OE pins on the SN74ABT2240APWR?

The 1OE and 2OE pins are active-low output-enable controls for the two independent 4-bit sections of the SN74ABT2240APWR. When pulled low, each section passes inverted data from its A inputs to its Y outputs; when high, the corresponding Y outputs enter high-impedance state. This allows selective bus isolation without affecting other channels - essential for multi-master arbitration and hot-swap capability in the SN74ABT2240APWR.

Does the SN74ABT2240APWR require external series resistors on its outputs?

No, the SN74ABT2240APWR does not require external series resistors. Its outputs integrate 25-Ω series termination to suppress overshoot and undershoot on transmission lines - a key feature confirmed in the datasheet's "Output Ports Have Equivalent 25-Ω Series Resistors" statement. This eliminates BOM items and layout complexity while maintaining signal integrity in the SN74ABT2240APWR's target applications.

What is the maximum operating temperature range for the SN74ABT2240APWR?

The SN74ABT2240APWR is characterized for operation from –40°C to +85°C ambient temperature, as specified in the "recommended operating conditions" table of its datasheet. This commercial-grade rating makes it suitable for industrial control cabinets, networking equipment, and embedded systems deployed in non-military environments - distinct from the military-grade SN54ABT2240A variant.

Can the SN74ABT2240APWR be used with a 3.3-V supply?

No, the SN74ABT2240APWR is not rated for 3.3-V operation. Its recommended VCC range is strictly 4.5 V to 5.5 V, and absolute maximum VCC is 7 V. Operating below 4.5 V risks unreliable logic thresholds and degraded output drive. For 3.3-V systems, consider alternatives like SN74LVC244APWR - but note that SN74ABT2240APWR itself requires a stable 5-V rail.

How does the SN74ABT2240APWR handle power-up sequencing to avoid bus contention?

To ensure high-impedance state during power-up, the OE pins of the SN74ABT2240APWR must be tied to VCC through an external pull-up resistor. The minimum resistor value depends on the current-sinking capability of the driving circuit; TI recommends calculating based on the driver's ability to sink ≥100 µA at 0.8 V. This prevents unintended output activation before system initialization completes - a critical design requirement explicitly stated for the SN74ABT2240APWR.