Texas Instruments SN74LVC2244ANS

Overview

SN74LVC2244ANS from NXP Semiconductors is an octal non-inverting 3-state buffer/line driver with integrated 30 Ω series output termination resistors, 5 V-tolerant I/O, and Schmitt-trigger inputs. It operates from 1.2 V to 3.6 V supply voltage, supports −40 °C to +125 °C ambient range, and enables level translation between 3.3 V and 5 V logic domains in industrial control backplanes.

For engineers reviewing the SN74LVC2244ANS datasheet, SN74LVC2244ANS pinout, SN74LVC2244ANS application, or SN74LVC2244ANS equivalent, key selection criteria include 3-state enable timing (t_en ≤ 10.5 ns at 3.6 V), 5.5 V tolerant outputs in high-impedance state, input transition rate tolerance up to 20 ns/V, and JEDEC-compliant operation across JESD8-7A, JESD8-5A, and JESD8-C standards.

Technical Context

The SN74LVC2244ANS implements dual independent 4-bit non-inverting buffers, each controlled by dedicated active-low output enable pins (1OE on Pin 1, 2OE on Pin 19). Its Schmitt-trigger inputs provide hysteresis for noise immunity with slow-rising/falling signals, while integrated 30 Ω series resistors in both HIGH and LOW output stages suppress transmission-line reflections without external components.

It supports mixed-voltage interfacing: inputs accept 0–5.5 V regardless of V_CC (1.2–3.6 V), and outputs tolerate up to 5.5 V when disabled. This allows direct connection to legacy 5 V TTL or CMOS buses while powered from modern low-voltage rails - critical for FPGA I/O expansion and microcontroller peripheral buffering.

Key Specifications

Pinout & Package

SN74LVC2244ANS is supplied in SO20 (SOT163-1) plastic small outline package: 20-pin, 7.5 mm body width, 1.27 mm pitch, gull-wing leads. Thermal pad (Pin 10) is electrically connected to GND but requires no soldering; if attached, must remain floating or tied to ground.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal buffer/line driver applications.

Compared with SN74LVC244A and 74ALVC244, the SN74LVC2244ANS uniquely combines 5 V-tolerant I/O, integrated termination, and extended low-voltage operation (down to 1.2 V), making it optimal for cost-sensitive, space-constrained industrial and automotive body electronics where signal integrity and voltage translation coexist.

Availability

SN74LVC2244ANS is available at Aetrix Electronics and suitable for industrial automation backplanes, FPGA I/O expansion, microcontroller peripheral interfacing, and automotive body control modules requiring stable component supply across extended temperature ranges.

Supply support for SN74LVC2244ANS 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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The 74LVC family delivers low-voltage, 5 V-tolerant logic ICs designed for seamless integration between legacy and next-generation digital systems - particularly where mixed-supply voltage translation, robust ESD performance, and compact packaging are essential.

FAQ

What is the maximum input voltage rating for SN74LVC2244ANS?

The SN74LVC2244ANS supports input voltages up to 5.5 V regardless of V_CC level (1.2–3.6 V), enabling direct connection to 5 V logic families without external clamping. This 5 V tolerance is guaranteed per JEDEC JESD78 and applies to all input pins including 1OE and 2OE. The SN74LVC2244ANS maintains full functionality and reliability under these conditions across its full operating temperature range.

Does SN74LVC2244ANS require external series termination resistors?

No, the SN74LVC2244ANS integrates 30 Ω series termination resistors in both HIGH and LOW output stages, eliminating the need for external resistors on PCB traces up to 15 cm in length. This feature reduces component count, saves board space, and improves signal integrity by minimizing reflections - confirmed by NXP's characterization data in Figure 5 and Table 7 of the datasheet.

Can SN74LVC2244ANS operate at 1.2 V supply voltage?

Yes, the SN74LVC2244ANS is fully specified down to 1.2 V V_CC, with propagation delay ≤35 ns and enable time ≤38 ns at that voltage. This ultra-low-voltage capability supports battery-powered and energy-harvesting applications where supply rails drop below 1.65 V. All DC and AC parameters remain valid across the entire 1.2–3.6 V range per Table 5 and Table 7 in the official NXP datasheet.

What is the thermal pad (Pin 10) connection requirement for SN74LVC2244ANS?

The thermal pad (Pin 10) of the SN74LVC2244ANS is internally connected to GND but has no electrical requirement for soldering. If soldered, the land pattern must remain electrically floating or be connected to GND - never to V_CC or signal nets. This design choice balances thermal performance with manufacturing flexibility and avoids unintended current paths that could compromise ESD robustness.

How does the Schmitt-trigger input improve noise immunity in SN74LVC2244ANS?

The Schmitt-trigger inputs on SN74LVC2244ANS provide ≥0.3 V hysteresis, allowing reliable detection of slow-rising or noisy signals with transition rates as low as 20 ns/V. This prevents multiple output toggles during slow edge transitions - critical in industrial environments with long cables, relay contacts, or unshielded wiring. The SN74LVC2244ANS achieves this without external RC networks, simplifying design and improving system reliability.