Texas Instruments SN74LVT244ANSR

Overview

SN74LVT244ANSR from Texas Instruments is a 3.3-V ABT octal buffer/driver with 3-state outputs, designed for mixed-mode interfacing between 3.3-V logic and 5-V systems. It features two independent 4-bit channels, bus-hold inputs eliminating external pullups, and supports operation down to 2.7 V. Used in backplane interface, memory address buffering, and bus isolation in industrial control systems.

For engineers reviewing the SN74LVT244ANSR datasheet, SN74LVT244ANSR pinout, SN74LVT244ANSR application, or SN74LVT244ANSR equivalent, key selection criteria include 3-state output drive strength (64 mA sink), bus-hold input capability, 2.7–3.6 V supply range, and compatibility with both 3.3-V and 5-V signal environments.

Technical Context

This device implements Advanced BiCMOS Technology (ABT) to deliver low-static power dissipation while maintaining TTL-compatible input thresholds and 5-V tolerant inputs. Its dual 4-bit architecture enables independent enable control per channel via 1OE and 2OE pins.

The bus-hold circuitry actively maintains valid logic levels on floating A inputs without external components, and the 3-state outputs support live insertion and hot-swap applications. Output ground bounce (VOLP) is specified at <0.8 V under typical conditions.

Key Specifications

Pinout & Package

SN74LVT244ANSR is packaged in a 20-pin plastic small-outline (SOIC) package with 0.209-inch body width and standard 0.050-inch lead pitch (ANSR suffix denotes SOIC-N). The package is RoHS-compliant and rated for –40°C to +85°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVTH244A and 74ALVC244, the SN74LVT244ANSR uniquely combines 5-V input tolerance, bus-hold inputs, and 64-mA drive in a single SOIC package - making it optimal for retrofitting legacy interfaces and noise-prone industrial backplanes.

Availability

SN74LVT244ANSR is available at Aetrix Electronics and suitable for industrial automation, embedded instrumentation, and communications infrastructure requiring stable component supply and long-term lifecycle assurance.

Supply support for SN74LVT244ANSR 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 SN74LVT244ANSR belongs to TI's LVT (Low-Voltage BiCMOS Technology) family, engineered specifically for reliable 3.3-V operation with backward compatibility to 5-V logic systems in demanding industrial and telecom applications.

FAQ

What is the operating temperature range for SN74LVT244ANSR?

The SN74LVT244ANSR is characterized for operation from –40°C to +85°C. This industrial-grade temperature range supports deployment in factory-floor controllers, outdoor telecom equipment, and vehicle-mounted electronics where ambient thermal stress is significant. The device maintains full electrical specifications across this range, including drive strength, propagation delay, and bus-hold functionality. SN74LVT244ANSR does not support extended military temperature ranges - those are covered by the SN54LVT244A variant.

Does SN74LVT244ANSR require external pull-up resistors on its inputs?

No, SN74LVT244ANSR does not require external pull-up resistors on its A inputs due to integrated bus-hold circuitry. Each input actively maintains its last-valid logic state when floating, drawing ±75 µA at defined threshold voltages. This feature reduces BOM count and PCB area in systems with unterminated buses or infrequently used control lines. However, OE pins must still be pulled up to VCC via an external resistor to ensure high-impedance state during power-up.

Can SN74LVT244ANSR interface directly with 5-V logic devices?

Yes, SN74LVT244ANSR supports direct interface with 5-V logic devices: its inputs tolerate up to 5.5 V regardless of VCC, and its outputs swing rail-to-rail within the 3.3-V domain while remaining compatible with TTL input thresholds. This mixed-mode capability allows seamless connection to legacy 5-V microcontrollers, FPGAs, or memory devices without external level shifters. SN74LVT244ANSR achieves this via ABT process technology, not translation circuitry.

What is the maximum output current rating for SN74LVT244ANSR?

The SN74LVT244ANSR is rated for 64 mA of low-level output current (IOL) per output pin and 32 mA of high-level output current (IOH) per output pin at VCC = 3.3 V. These values are guaranteed over the full operating temperature range and enable driving multiple TTL loads or terminated transmission lines. Exceeding these limits risks thermal shutdown or parametric shift; simultaneous switching of all eight outputs requires careful power delivery design due to cumulative ICC.

Which package type does SN74LVT244ANSR use, and is it RoHS-compliant?

SN74LVT244ANSR uses a 20-pin plastic small-outline (SOIC-N) package with ANSI standard dimensions (0.209-inch body width, 0.050-inch lead pitch), designated by the "ANSR" suffix. This package is lead-free and RoHS-compliant, meeting JEDEC J-STD-020 moisture sensitivity level 3 requirements. It is footprint-compatible with industry-standard SOIC-20 sockets and reflow profiles, supporting automated assembly in high-volume manufacturing.