STMicroelectronics 74LVC244AMTR

Overview

74LVC244AMTR from STMicroelectronics is an octal 3-state bus buffer with dual independent output-enable controls (1G and 2G), designed for bidirectional data flow control in low-voltage digital systems. It operates from 1.65 V to 3.6 V, delivers ±24 mA output drive at 3.0 V, achieves 5.9 ns max propagation delay, and features 5V-tolerant inputs-enabling direct interfacing with legacy 5V logic in mixed-supply environments such as industrial I/O expansion modules.

For engineers reviewing the 74LVC244AMTR datasheet, 74LVC244AMTR pinout, 74LVC244AMTR application, or 74LVC244AMTR equivalent, key selection criteria include its symmetrical output impedance, power-down protection on all I/Os, latch-up immunity >500 mA, guaranteed PCI bus compatibility at 24 mA, and precise timing matching between tPLH and tPHL for noise-sensitive address/data bus buffering.

Technical Context

The 74LVC244AMTR implements two groups of four non-inverting buffers, each controlled by a dedicated 3-state enable (1G/2G). Its C2MOS process ensures rail-to-rail input voltage tolerance up to 5.5 V while maintaining full functionality across 1.65–3.6 V VCC, making it suitable for level translation between 3.3 V logic domains and 5 V peripherals.

All eight outputs exhibit matched rise/fall propagation delays (tPLH ≅ tPHL) and sub-1 ns output skew, critical for synchronous bus integrity. Input leakage remains ≤±5 µA over temperature, and power-off leakage (Ioff) is limited to 10 µA when VCC = 0 V-supporting hot-swap and partial-power-down system architectures.

Key Specifications

Pinout & Package

74LVC244AMTR is supplied in a 20-pin SOIC (Small Outline Integrated Circuit) package per JEDEC MS-013, with 1.27 mm pitch, 12.6–13.0 mm body length, and 10.0–10.65 mm body width. Pin 1 is marked by a beveled corner or notch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC244APWR and 74ALVC244MTCX, the 74LVC244AMTR uniquely balances ultra-low ICC (10 µA), full 1.65–3.6 V operation, and 2000 V HBM ESD-making it optimal for portable, mixed-voltage, and industrial-grade designs where power, flexibility, and ruggedness are jointly constrained.

Availability

74LVC244AMTR is available at Aetrix Electronics and suitable for industrial PLC backplanes, embedded microcontroller I/O expansion, PCI bus signal conditioning, and test equipment digital pattern generation requiring stable component supply across extended temperature ranges (–55 °C to +125 °C).

Supply support for 74LVC244AMTR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management ICs with vertical manufacturing and broad analog/mixed-signal portfolio.

The 74LVC244AMTR belongs to ST's LVC (Low-Voltage CMOS) logic family, engineered for interoperability across 1.65–5.5 V logic domains while minimizing dynamic power and electromagnetic emissions in space-constrained digital systems.

FAQ

Can 74LVC244AMTR operate with VCC = 1.8 V and interface to 5 V sensors?

Yes. The device is fully specified from 1.65 V to 3.6 V VCC and supports 5 V-tolerant inputs up to 5.5 V. At VCC = 1.8 V, VIH = 0.65 × VCC = 1.17 V and VIL = 0.35 × VCC = 0.63 V, enabling reliable detection of 5 V TTL logic levels without external biasing or clamping diodes.

What is the maximum capacitive load this buffer can drive at 100 MHz?

Based on CPD = 34 pF at VCC = 3.3 V and measured tPD = 5.9 ns, the 74LVC244AMTR reliably drives ≤50 pF loads (including trace + termination + input capacitance) at 100 MHz. Exceeding this requires series termination or reduced edge rate to maintain signal integrity and avoid overshoot.

Does the 74LVC244AMTR support hot-swap insertion when VCC is off?

Yes. With VCC = 0 V, all I/O pins enter high-impedance mode and exhibit Ioff ≤10 µA at VI/VO = 5.5 V. This prevents back-powering of the host board and eliminates bus contention-meeting IEC 61000-4-2 Level 4 ESD and hot-swap safety requirements.

How does output skew impact timing in parallel bus applications?

With tOSLH/tOSHL ≤1 ns across all eight outputs, the 74LVC244AMTR ensures simultaneous assertion of data bits on wide buses. This minimizes inter-bit skew-induced setup/hold violations-critical for DDR-like interfaces where 1 ns skew at 100 MHz consumes 10% of the clock period.