Nexperia USA Inc. 74LVC2244AD,112

Overview

74LVC2244AD from Nexperia is an octal 3-state buffer/line driver with dual independent output enables (1OE, 2OE), integrated 30 Ω series termination resistors on all outputs, 5 V tolerant I/O, and operation from 1.2 V to 3.6 V supply. It functions as two 4-bit or one 8-bit buffer in mixed-voltage systems and supports partial power-down via IOFF circuitry. Used in industrial backplane drivers and FPGA I/O expansion interfaces.

For engineers reviewing the 74LVC2244AD datasheet, 74LVC2244AD pinout, 74LVC2244AD application, or 74LVC2244AD equivalent, key selection criteria include 30 Ω on-die series termination for signal integrity, dual OE control for flexible bus partitioning, IOFF-enabled partial power-down, Schmitt-trigger inputs for noise immunity, and guaranteed operation across -40 °C to +125 °C.

Technical Context

This device implements two independent 4-bit non-inverting buffers, each controlled by a dedicated active-low output enable (1OE for outputs 1Y0–1Y3; 2OE for 2Y0–2Y3). All inputs feature Schmitt-trigger action, enabling robust operation with slow-rising signals and reducing susceptibility to noise-induced switching.

The IOFF circuit ensures outputs enter high-impedance state when VCC = 0 V, blocking backflow current during partial power-down. Inputs tolerate up to 5.5 V regardless of VCC level (1.2 V–3.6 V), enabling direct interfacing between 3.3 V logic and legacy 5 V peripherals without external level shifters.

Key Specifications

Pinout & Package

74LVC2244AD is supplied in SO20 (SOT163-1) package: plastic small outline, 20 leads, 7.5 mm body width, 1.27 mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC8T245RHLR, 74LVC2244AD offers simpler unidirectional control and built-in termination; compared with 74LVC244APW,118, it shares identical functionality but differs in mechanical form factor and thermal profile-SO20 suits through-hole prototyping and legacy assembly, while TSSOP20 targets miniaturized production boards.

Availability

74LVC2244AD is available at Aetrix Electronics and suitable for industrial backplane drivers, FPGA I/O expansion interfaces, automotive body control modules, and mixed-voltage sensor hubs requiring stable component supply across extended temperature ranges.

Supply support for 74LVC2244AD 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

Nexperia is a global semiconductor expert focused on essential efficiency technologies, delivering high-performance logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74LVC2244A belongs to Nexperia's LVC (Low-Voltage CMOS) logic family, designed specifically for robust, low-power, mixed-voltage interfacing in space- and energy-constrained embedded systems.

FAQ

What is the maximum input voltage the 74LVC2244AD can tolerate when VCC = 1.8 V?

The device tolerates input voltages up to 5.5 V regardless of VCC level, as confirmed in Table 4 (Limiting Values) and Section 2 (Features and benefits). This allows safe interfacing with 5 V sources even when powered from 1.8 V, eliminating external clamping diodes or level shifters in mixed-voltage designs.

Does the 30 Ω series termination apply to both HIGH and LOW output states?

Yes-the integrated 30 Ω resistor is placed in series with each output driver transistor (both pull-up and pull-down paths), as verified in the functional description and dynamic characteristics section. This provides symmetrical source termination for clean edges in both logic transitions, reducing overshoot and undershoot on transmission lines.

Can 74LVC2244AD operate reliably at VCC = 1.2 V with full-speed performance?

Yes-static and dynamic specifications are guaranteed down to 1.2 V, including VIH/VIL thresholds and tpd ≤ 35 ns (Table 7). However, propagation delay increases significantly at minimum VCC; for timing-critical paths requiring <5 ns delay, operation above 2.7 V is recommended per Table 7's typical values.

How does the IOFF feature behave when only one supply rail (VCC) is ramped down?

IOFF activates when VCC drops below ~0.8 V, forcing all outputs into high-impedance state and limiting OFF-state leakage to ±10 μA (Table 6). This prevents reverse current flow from powered 5 V buses into the de-energized IC, protecting both the buffer and upstream drivers during asymmetric power sequencing.