NXP Semiconductors 74LVC544ADB,112

Overview

74LVC544ADB,112 from NXP Semiconductors is an octal registered inverting transceiver with dual-directional 3-state D-type latches, operating from 1.2 V to 3.6 V supply, supporting 5 V-tolerant I/O, and rated for −40 °C to +125 °C. It enables bidirectional data flow between two 8-bit buses (A0–A7 ↔ B0–B7) with independent latch enable (LEAB/LEBA) and output enable (OEAB/OEBA) controls, used in bus isolation and level-shifting applications in industrial control backplanes.

For engineers reviewing the 74LVC544ADB,112 datasheet, 74LVC544ADB,112 pinout, 74LVC544ADB,112 application, or 74LVC544ADB,112 equivalent, key selection considerations include its 24-pin SSOP package, 3.3 ns typical propagation delay at 3.3 V, 5 V-tolerant inputs/outputs, latch transparency vs. storage behavior, and compliance with JEDEC JESD8-7A/5A/C standards for low-voltage logic interfacing.

Technical Context

The 74LVC544ADB,112 implements two independent 8-bit registered transceiver channels-A-to-B and B-to-A-with separate active-low latch enable (LEAB, LEBA) and output enable (OEAB, OEBA) inputs. Each direction features edge-triggered latching: a LOW-to-HIGH transition on LEXX captures data while EEXX is LOW, and OEEXX controls 3-state output drivers.

It supports partial power-down operation (inputs/outputs high-impedance when VCC = 0 V), meets JEDEC voltage-level standards across 1.65–1.95 V, 2.3–2.7 V, and 2.7–3.6 V ranges, and provides ESD protection exceeding 2000 V HBM, 200 V MM, and 1000 V CDM per JESD22-A114F/A115-B/C101E.

Key Specifications

Pinout & Package

74LVC544ADB,112 uses the SSOP24 package (SOT340-1): plastic shrink small outline, 24 leads, body width 5.3 mm, pitch 0.65 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC544APWRE4 and 74ALVC544MTCX, the 74LVC544ADB,112 offers optimal balance of wide supply range (1.2–3.6 V), JEDEC multi-standard compliance, and industrial temperature support in a 5.3 mm SSOP-making it preferred for mixed-voltage, thermally demanding, or long-lifecycle industrial deployments.

Availability

74LVC544ADB,112 is available at Aetrix Electronics and suitable for industrial automation backplanes, medical data acquisition modules, and test equipment signal routing requiring stable component supply across extended temperature and voltage ranges.

Supply support for 74LVC544ADB,112 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 74LVC544ADB,112 belongs to NXP's LVC (Low-Voltage CMOS) logic family, designed specifically for robust, low-power, mixed-voltage digital interfacing in harsh industrial environments with extended temperature and ESD requirements.

FAQ

What is the maximum clock frequency supported by the 74LVC544ADB,112 for reliable data latching?

The 74LVC544ADB,112 does not operate on a clock signal-it uses edge-triggered latch enables (LEAB/LEBA). Its reliable operation depends on setup/hold timing: at VCC = 3.3 V, tsu and th are both ≥2.0 ns. With a minimum LE pulse width (tW) of 2.0 ns and propagation delay (tpd) of 6.5 ns max, it supports effective bus handshaking up to approximately 80 MHz in synchronous systems where control signals meet these timing windows. The 74LVC544ADB,112 datasheet specifies no maximum clock frequency because it is not a clocked device.

Can the 74LVC544ADB,112 be used to interface a 1.8 V microcontroller with a 5 V peripheral without external level shifters?

Yes-the 74LVC544ADB,112 has 5 V-tolerant inputs and outputs, meaning it accepts 0–5.5 V input signals and drives up to 5.5 V in 3-state OFF condition, all while powered from 1.8 V (within its 1.2–3.6 V VCC range). When VCC = 1.8 V, VOH is ≥1.62 V (0.9 × VCC) and VOL ≤0.18 V, sufficient to meet 1.8 V logic thresholds. Thus, the 74LVC544ADB,112 safely bridges the voltage domains without external components.

Does the 74LVC544ADB,112 support hot-plug or live-insertion scenarios?

Yes-the 74LVC544ADB,112 supports partial power-down: when VCC = 0 V, all inputs and outputs enter high-impedance state with IOFF ≤±20 µA, preventing back-driving or leakage currents into unpowered circuitry. This behavior, combined with 5 V-tolerant I/O, makes the 74LVC544ADB,112 suitable for hot-plug applications such as modular backplanes or field-replaceable I/O cards where power sequencing is uncontrolled.

How does the latch enable (LE) functionality differ from the output enable (OE) in the 74LVC544ADB,112?

In the 74LVC544ADB,112, LEAB/LEBA control data capture: a LOW-to-HIGH transition stores the current A/B-bus values into internal D-type latches (if EAB/EBA is LOW), freezing outputs regardless of further input changes. OEAB/OEBA control output drivers only: when HIGH, they force B0–B7 or A0–A7 into high-impedance, disconnecting the bus-but do not affect latch contents. Thus, LE manages data storage timing; OE manages bus contention avoidance. Both are essential for glitch-free 74LVC544ADB,112 operation.

Is the 74LVC544ADB,112 pin-compatible with other packages in the 74LVC544A family?

Yes-the 74LVC544ADB,112 (SSOP24/SOT340-1), 74LVC544AD (SO24/SOT137-1), and 74LVC544APW (TSSOP24/SOT355-1) share identical pin numbering, pin functions, and electrical specifications. Only the physical package dimensions differ: SSOP24 is 5.3 mm wide, SO24 is 7.5 mm, and TSSOP24 is 4.4 mm. Layouts can reuse the same schematic symbol; only the footprint must be updated. This pin compatibility simplifies design reuse across cost, density, and thermal requirements for the 74LVC544ADB,112 and its variants.