NXP Semiconductors 74LVC543ADB,118

Overview

74LVC543ADB,118 from NXP Semiconductors (formerly Philips) is an octal D-type registered transceiver with dual-direction 3-state bus interface, operating from 1.2 V to 3.6 V supply, featuring 5 V tolerant I/O, −40 °C to +125 °C temperature range, and propagation delay of 3.0 ns (typ.) at VCC = 3.3 V. It enables bidirectional data latching in industrial control backplanes and low-voltage microprocessor buses.

For engineers reviewing the 74LVC543ADB,118 datasheet, 74LVC543ADB,118 pinout, 74LVC543ADB,118 application, or 74LVC543ADB,118 equivalent, key selection criteria include bidirectional latch enable control (LEAB/LEBA), independent output enable per direction (OEAB/OEBA), 5 V tolerance for mixed-voltage system interfacing, and SSOP24 package compatibility with high-density PCB layouts.

Technical Context

The 74LVC543ADB,118 implements two independent 8-bit D-type latch banks-one for A-to-B and one for B-to-A data flow-with separate latch enable (LEAB/LEBA) and output enable (OEAB/OEBA) inputs. Each direction supports transparent, latched, and high-impedance states via combinational control of EAB/EBA, LEAB/LEBA, and OEAB/OEBA.

It uses Si-gate CMOS technology compliant with JEDEC JESD8-B/JESD36, delivering low dynamic power (CPD = 15.0 pF per latch enabled) and robust ESD protection (HBM > 2000 V). The device maintains high-impedance outputs when VCC = 0 V, supporting hot-swap capability in modular systems.

Key Specifications

Pinout & Package

74LVC543ADB,118 is housed in a plastic shrink small outline package (SSOP24), SOT340-1, with 24 leads, body width 5.3 mm, and standard 0.65 mm lead pitch. Pin 1 is marked by an index area; package is RoHS-compliant and moisture-sensitive level 1 (MSL1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC823APW and 74ALVC162245DGGR, the 74LVC543ADB,118 uniquely provides full bidirectional 8-bit latching with 5 V tolerant I/O in SSOP24 - making it irreplaceable where simultaneous A↔B register staging and legacy voltage interoperability are mandatory.

Availability

74LVC543ADB,118 is available at Aetrix Electronics and suitable for industrial backplane interfaces, microcontroller bus expansion, automotive body control modules, and test equipment digital I/O subsystems requiring stable component supply across extended temperature ranges.

Supply support for 74LVC543ADB,118 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 leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with roots in Philips' pioneering logic portfolio.

The 74LVC543ADB,118 belongs to the LVC (Low-Voltage CMOS) logic family, designed specifically for high-speed, low-power, mixed-voltage digital interfacing in space-constrained embedded systems.

FAQ

What is the maximum operating frequency supported by the 74LVC543ADB,118?

The 74LVC543ADB,118 does not specify a maximum clock frequency directly, but its typical propagation delay of 3.0 ns (at VCC = 3.3 V, CL = 50 pF) implies reliable operation up to approximately 160 MHz for single-cycle data transfer. System-level timing depends on setup/hold requirements (e.g., tsu = +1.5 ns, th = 0.6 ns at 3.3 V), and actual bus frequency must account for worst-case delays across temperature and voltage extremes. The 74LVC543ADB,118 is optimized for asynchronous latch-controlled data handoff rather than synchronous clocked operation.

Does the 74LVC543ADB,118 require external pull-up or pull-down resistors on control pins?

No, the 74LVC543ADB,118 has no internal pull resistors on LEAB, LEBA, OEAB, OEBA, EAB, or EBA - all control inputs are CMOS with high impedance and must be actively driven HIGH or LOW. Floating control pins may cause undefined latch or output states, leading to bus contention or excessive current draw. External termination is required only if board layout introduces noise susceptibility; typical designs use MCU GPIO or dedicated logic to drive these pins directly. The 74LVC543ADB,118 itself imposes no pull requirement.

Can the 74LVC543ADB,118 be used in a 1.8 V system with 5 V peripherals?

Yes - the 74LVC543ADB,118 supports VCC = 1.8 V and features 5 V tolerant inputs/outputs, allowing safe interfacing between a 1.8 V microcontroller and 5 V peripherals such as legacy displays or sensors. Input thresholds scale with VCC (VIH ≥ 2.0 V at 1.8 V VCC), and output drive strength remains functional (VOL ≤ 0.6 V at 12 mA sink), though VOL/VOL specs degrade slightly versus 3.3 V operation. The 74LVC543ADB,118 maintains full logic compatibility and ESD robustness (HBM > 2000 V) across this mixed-voltage use case.

What is the thermal performance of the 74LVC543ADB,118 in SSOP24 package?

The 74LVC543ADB,118 in SSOP24 (SOT340-1) has a thermal derating of 5.5 mW/K above 60 °C ambient, with maximum power dissipation rated at 500 mW at Tamb = −40 °C to +125 °C. At 3.3 V and full 8-bit switching, typical dynamic power is ~1.2 mW per latch (CPD = 15 pF), totaling <10 mW - well within thermal limits. PCB layout should include thermal relief pads and at least two GND/VCC vias near pins 12 and 24. The 74LVC543ADB,118 exhibits no thermal shutdown and maintains parametric stability across its full operating range.

How does the 74LVC543ADB,118 handle bus contention during direction switching?

The 74LVC543ADB,118 prevents bus contention through strict 3-state control sequencing: OEAB and OEBA must be HIGH (disabled) before changing EAB/EBA or LEAB/LEBA states, ensuring outputs enter high-impedance before new drivers activate. The function table confirms that any transition into "Disabled" mode (OEXX = H) forces immediate Z-state regardless of latch or enable status. This behavior, combined with guaranteed tPZH/tPHZ ≤ 10.0 ns (max), ensures glitch-free direction reversal. The 74LVC543ADB,118 relies on system-level control logic to observe this sequence - no internal arbitration is provided.