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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

NXP Semiconductors 74LVC544ADB,118

Name: 74LVC544ADB,118
Brand: NXP Semiconductors
SKU: 74LVC544ADB,118
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74LVC544ADB,118

Manufacturer:: NXP Semiconductors

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 24-SSOP (0.209", 5.30mm Width)

Datasheet:: 74LVC544ADB,118.pdf

Description:: IC TXRX INVERT 3.6V 24SSOP

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Product details

Overview

74LVC544ADB,118 from NXP Semiconductors is an octal registered inverting transceiver with dual-direction 3-state bus interface capability, featuring separate A→B and B→A latch enable (LEAB/LEBA) and output enable (OEAB/OEBA) controls, 1.2 V to 3.6 V supply operation, −40 °C to +125 °C temperature range, and 5 V tolerant I/O for mixed-voltage system interfacing - used in bidirectional data buffering between microcontroller peripherals and memory-mapped I/O subsystems.

For engineers reviewing the 74LVC544ADB,118 datasheet, 74LVC544ADB,118 pinout, 74LVC544ADB,118 application, or 74LVC544ADB,118 equivalent, this page delivers verified functional architecture, SSOP24 package mapping, timing-critical setup/hold and propagation delay values across voltage/temperature ranges, and validated alternative parts for register-controlled bidirectional bus isolation.

Technical Context

The 74LVC544ADB,118 implements two independent 8-bit D-type latch banks - one for A-to-B direction, one for B-to-A - each with dedicated enable logic that supports transparent, latched, and high-impedance states. Its back-to-back register structure enables synchronous capture of data on both sides of a shared bus without contention.

Control is fully decoupled: EAB/EBA govern data path activation, LEAB/LEBA control latch transparency vs. storage, and OEAB/OEBA manage 3-state output drivers. This allows independent staging, holding, and driving of data in either direction - critical for CPU-to-peripheral handshaking and memory-mapped I/O arbitration.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	1.2 V to 3.6 V - enables direct interface with 1.8 V/2.5 V/3.3 V logic domains without level shifters.
I/O Voltage Tolerance	5 V tolerant inputs/outputs - permits safe connection to legacy 5 V buses while powered from lower-voltage rails.
Propagation Delay (t_pd)	3.3 ns typical at V_CC = 3.3 V - ensures sub-300 MHz bus timing margin for high-speed peripheral interfaces.
Operating Temperature	−40 °C to +125 °C - qualified for industrial and extended-temperature embedded control applications.
ESD Protection	HBM > 2000 V, CDM > 1000 V - meets robustness requirements for board-level handling and field deployment.
Output Drive Strength	±24 mA at V_CC = 3.0 V - drives standard 50 Ω transmission lines or multiple CMOS loads without external buffers.
Power-Down Behavior	Inputs/outputs enter high-impedance state when V_CC = 0 V - prevents backfeeding and supports hot-swap or partial-power-down system modes.

Pinout & Package

74LVC544ADB,118 is housed in a plastic shrink small outline package (SSOP24) with 24 leads, 5.3 mm body width, and 0.65 mm lead pitch (SOT340-1). Pin 1 is marked by a notch or dot; pins are numbered counterclockwise from pin 1.

Pin/Terminal	Circuit Role	Design Meaning
1 (LEBA)	B-to-A latch enable input	Active LOW; makes B→A latches transparent when LOW, captures B-side data on rising edge.
2 (OEBA)	B-to-A output enable input	Active LOW; enables B→A 3-state outputs only when EBA and OEBA are both LOW.
3–10 (A0–A7)	A-side bidirectional data terminals	Connect to A-bus; function as inputs during B→A transfer, outputs during A→B transfer.
11 (EAB)	A-to-B enable input	Active LOW; activates A→B data path when LOW; must be asserted before LEAB/OEAB.
12 (GND)	Ground reference	0 V return for all internal logic and I/O circuits; requires low-inductance PCB connection.
13 (OEAB)	A-to-B output enable input	Active LOW; enables A→B 3-state outputs only when EAB and OEAB are both LOW.
14 (LEAB)	A-to-B latch enable input	Active LOW; makes A→B latches transparent when LOW, stores A-side data on rising edge.
15–22 (B7–B0)	B-side bidirectional data terminals	Connect to B-bus; function as outputs during A→B transfer, inputs during B→A transfer.
23 (EBA)	B-to-A enable input	Active LOW; activates B→A data path when LOW; must be asserted before LEBA/OEBA.
24 (V_CC)	Positive supply voltage	1.2 V to 3.6 V power rail; requires local 100 nF ceramic decoupling adjacent to pin.

Key Features

Feature	Design Value
Dual independent 8-bit latch banks	Enables simultaneous capture and hold of data flowing in opposite directions - essential for full-duplex bus arbitration.
Separate A→B and B→A control signals	Eliminates timing conflicts during bidirectional transfers; allows pipelined read/write operations without bus turnaround delay.
5 V tolerant I/O with 1.2 V minimum V_CC	Supports interoperability between legacy 5 V peripherals and modern low-voltage processors without external level translation.
JEDEC-compliant voltage standards	Fully compliant with JESD8-7A (1.65–1.95 V), JESD8-5A (2.3–2.7 V), and JESD8-C/JESD36 (2.7–3.6 V) - guarantees interoperability across voltage bins.
High-impedance on power loss	Prevents signal contention and backfeeding when V_CC drops to 0 V - critical for hot-plug and fail-safe system design.

Applications

Industrial PLC I/O Expansion	Embedded Microcontroller Bus Interface
Use Scenario: Isolating and buffering parallel I/O expansion modules connected to a main controller via shared address/data bus. IC Role / Device Role / Timing Role: Bidirectional registered transceiver managing data flow between controller and isolated I/O banks, with latch synchronization preventing metastability during bus handshaking. Use Value: Enables deterministic timing for multi-cycle read/write sequences across noisy industrial environments using separate LE/OE controls per direction.	Use Scenario: Interfacing a 3.3 V ARM Cortex-M microcontroller with legacy 5 V peripherals (e.g., LCD controllers, EEPROMs) over a parallel bus. IC Role / Device Role / Timing Role: Voltage-tolerant octal transceiver providing level-shifted, latched, and 3-state-controlled data transfer between mismatched logic families. Use Value: Eliminates need for discrete level shifters while maintaining precise timing control via independent latch enable and output enable signals.
Memory-Mapped Peripheral Bridge	Test Equipment Digital Pattern Generator
Use Scenario: Connecting FPGA-based test logic to external memory-mapped devices requiring synchronized data capture and drive control. IC Role / Device Role / Timing Role: Registered transceiver acting as a timing-isolated bridge, capturing incoming data on one edge and presenting it on the other side with controlled latency. Use Value: Provides deterministic setup/hold margins (e.g., 2.0 ns min t_su at 3.3 V) for reliable capture of asynchronous peripheral responses.	Use Scenario: Generating and capturing digital stimulus patterns in automated test equipment where bidirectional bus control and signal integrity are critical. IC Role / Device Role / Timing Role: High-speed octal transceiver with sub-4 ns propagation delay and <1.5 ns output skew, enabling precise pattern alignment across 8-bit channels. Use Value: Delivers matched timing across all eight lanes (tsk(o) ≤ 1.5 ns), reducing pattern skew and improving test repeatability.

Industrial PLC I/O Expansion

Embedded Microcontroller Bus Interface

Use Scenario: Isolating and buffering parallel I/O expansion modules connected to a main controller via shared address/data bus.

IC Role / Device Role / Timing Role: Bidirectional registered transceiver managing data flow between controller and isolated I/O banks, with latch synchronization preventing metastability during bus handshaking.

Use Value: Enables deterministic timing for multi-cycle read/write sequences across noisy industrial environments using separate LE/OE controls per direction.

Use Scenario: Interfacing a 3.3 V ARM Cortex-M microcontroller with legacy 5 V peripherals (e.g., LCD controllers, EEPROMs) over a parallel bus.

IC Role / Device Role / Timing Role: Voltage-tolerant octal transceiver providing level-shifted, latched, and 3-state-controlled data transfer between mismatched logic families.

Use Value: Eliminates need for discrete level shifters while maintaining precise timing control via independent latch enable and output enable signals.

Memory-Mapped Peripheral Bridge

Test Equipment Digital Pattern Generator

Use Scenario: Connecting FPGA-based test logic to external memory-mapped devices requiring synchronized data capture and drive control.

IC Role / Device Role / Timing Role: Registered transceiver acting as a timing-isolated bridge, capturing incoming data on one edge and presenting it on the other side with controlled latency.

Use Value: Provides deterministic setup/hold margins (e.g., 2.0 ns min t_su at 3.3 V) for reliable capture of asynchronous peripheral responses.

Use Scenario: Generating and capturing digital stimulus patterns in automated test equipment where bidirectional bus control and signal integrity are critical.

IC Role / Device Role / Timing Role: High-speed octal transceiver with sub-4 ns propagation delay and <1.5 ns output skew, enabling precise pattern alignment across 8-bit channels.

Use Value: Delivers matched timing across all eight lanes (tsk(o) ≤ 1.5 ns), reducing pattern skew and improving test repeatability.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC544APWRE4	TSSOP24 package (SOT355-1); identical electrical specs and pinout; 4.4 mm body width vs. 5.3 mm for SSOP.	Requires PCB layout revision due to smaller footprint and tighter lead pitch (0.65 mm same, but shorter lead length).	Select for space-constrained designs where thermal dissipation is less critical than board area.
74ALVC544MTCX	Higher speed (t_pd = 2.5 ns typ @ 3.3 V); same SSOP24 package; 2.5 V to 3.6 V V_CC range only - no 1.2–1.8 V support.	Not suitable for ultra-low-voltage systems; lacks 5 V tolerance on inputs - requires external clamping if interfacing 5 V signals.	Choose when maximum speed is prioritized over wide-voltage operation and 5 V tolerance.

Compared with SN74LVC544APWRE4 and 74ALVC544MTCX, the 74LVC544ADB,118 uniquely balances wide supply range (1.2–3.6 V), 5 V I/O tolerance, and SSOP24 mechanical compatibility - making it optimal for industrial designs needing robustness across voltage domains without footprint change.

Availability

74LVC544ADB,118 is available at Aetrix Electronics and suitable for industrial automation, embedded microcontroller interfacing, memory-mapped peripheral bridging, and test equipment digital pattern generation requiring stable component supply across extended temperature and mixed-voltage conditions.

Supply support for 74LVC544ADB,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 company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The 74LVC544ADB,118 belongs to NXP's LVC (Low-Voltage CMOS) logic family, designed specifically for high-speed, low-power, mixed-voltage digital interfacing in industrial and embedded systems where reliability across temperature and voltage extremes is mandatory.

FAQ

What is the maximum operating frequency supported by the 74LVC544ADB,118?

The 74LVC544ADB,118 does not specify a clock frequency but supports data rates up to ~300 MHz based on its 3.3 ns typical propagation delay (t_pd) at V_CC = 3.3 V. System-level frequency depends on bus loading, PCB trace length, and setup/hold timing margins - actual usable rate is determined by the slowest path in the data capture chain, not the transceiver alone. The 74LVC544ADB,118 itself imposes no internal clocking constraint.

Can the 74LVC544ADB,118 interface directly with 5 V TTL logic?

Yes, the 74LVC544ADB,118 features 5 V tolerant inputs and outputs, allowing direct connection to 5 V TTL logic while operating from a 1.2 V to 3.6 V supply. Input thresholds meet TTL-compatible levels across its full V_CC range (e.g., V_IL ≤ 0.8 V, V_IH ≥ 2.0 V at V_CC = 3.3 V), and output drive strength (±24 mA) exceeds standard TTL fan-out requirements. The 74LVC544ADB,118 eliminates need for external level-shifting circuitry in mixed-voltage systems.

How does the latch enable (LE) functionality work in the 74LVC544ADB,118?

The 74LVC544ADB,118 uses separate LEAB (A→B) and LEBA (B→A) inputs. When LEXX is LOW, the corresponding latch is transparent - output follows input. A LOW-to-HIGH transition on LEXX captures and holds the current input value. Data remains stored until the next LE transition, independent of OE or E states. This allows precise, edge-triggered data capture synchronized to system control signals - a core capability of the 74LVC544ADB,118 for deterministic bus handshaking.

Is the 74LVC544ADB,118 pin-compatible with other packages in the 74LVC544A family?

Yes, the 74LVC544ADB,118 (SSOP24/SOT340-1), 74LVC544AD (SO24/SOT137-1), and 74LVC544APW (TSSOP24/SOT355-1) share identical pin numbering and electrical functionality. All three variants use the same 24-pin layout with identical signal assignments (e.g., LEBA on pin 1, V_CC on pin 24). Mechanical differences - body width (5.3 mm vs. 7.5 mm vs. 4.4 mm) and lead form - require separate footprints, but logic design and schematic symbols remain interchangeable. The 74LVC544ADB,118 is electrically and functionally identical to those variants.

What is the purpose of the EAB and EBA pins on the 74LVC544ADB,118?

EAB (pin 11) and EBA (pin 23) are active-LOW enable inputs that gate the A→B and B→A data paths respectively. They must be LOW before LEAB/LEBA or OEAB/OEBA can take effect. When EAB is HIGH, the A→B path is disabled regardless of LEAB/OEAB states - preventing unintended data flow or bus contention. This two-stage enable (E then LE/OE) provides hierarchical control essential for safe bidirectional bus arbitration. The 74LVC544ADB,118 relies on EAB/EBA to isolate directional paths prior to latching or driving.

74LVC544ADB,118 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: 74LVC

Package/Case:: 24-SSOP (0.209", 5.30mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Logic Type:: Transceiver, Inverting

Number of Elements:: 1

Number of Bits per Element:: 8

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 24mA, 24mA

Voltage - Supply:: 1.2V ~ 3.6V

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 24-SSOP

74LVC544ADB,118 FAQ

1.How can I place an order for 74LVC544ADB,118 through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LVC544ADB,118 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 74LVC544ADB,118 reliable?

The price and inventory of 74LVC544ADB,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVC544ADB,118 is usually 5 days.

3.What payment methods are accepted for 74LVC544ADB,118?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVC544ADB,118 transactions.

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4.How is shipping managed for 74LVC544ADB,118?

74LVC544ADB,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LVC544ADB,118 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 74LVC544ADB,118?

For technical support, including 74LVC544ADB,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVC544ADB,118 requirements.

6.How does Aetrix verify that 74LVC544ADB,118 is sourced from the original manufacturer or authorized distributors?

All 74LVC544ADB,118 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 74LVC544ADB,118 meets industry standards.

7.What is the process for return or replacement of 74LVC544ADB,118?

All 74LVC544ADB,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74LVC544ADB,118, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 74LVC544ADB,118 part is unused and in its original packaging.

Return procedure for 74LVC544ADB,118:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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