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NXP Semiconductors 74LVC543ABQ,118
- Part No.:
- 74LVC543ABQ,118
- Manufacturer:
- NXP Semiconductors
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
74LVC543ABQ,118.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 24DHVQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,207
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Product details
Overview
74LVC543ABQ,118 from NXP Semiconductors (formerly Philips) is an octal D-type registered transceiver with dual-direction 3-state bus interface capability, operating from 1.2 V to 3.6 V supply, featuring 5 V tolerant I/O, −40 °C to +125 °C temperature range, and DHVQFN24 package. It enables bidirectional data flow control in high-density memory or peripheral bus systems.
For engineers reviewing the 74LVC543ABQ,118 datasheet, 74LVC543ABQ,118 pinout, 74LVC543ABQ,118 application, or 74LVC543ABQ,118 equivalent, key selection criteria include latch enable independence per direction, 3.0 ns typical propagation delay at 3.3 V, 5 V tolerance for mixed-voltage interfacing, and DHVQFN24 thermal performance in space-constrained embedded designs.
Technical Context
The 74LVC543ABQ,118 implements two independent 8-bit D-type latch banks-one for A-to-B and one for B-to-A data paths-with separate LEAB/LEBA latch enable and OEAB/OEBA output enable controls. This architecture supports simultaneous latching and 3-state output control in either direction without cross-talk.
It uses Si-gate CMOS technology with rail-to-rail 5 V tolerant inputs/outputs, enabling direct connection to legacy 5 V TTL buses while powered from low-voltage 1.2–3.6 V supplies. The device guarantees tPHL/tPLH ≤ 9.0 ns (max) over full temperature range at 3.0–3.6 V and supports 24 mA drive strength on outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.2 V to 3.6 V - enables operation in ultra-low-power and mixed-voltage systems without level shifters |
| I/O Voltage Tolerance | Up to 5.5 V - allows safe interfacing with 5 V logic families while VCC = 1.2–3.6 V |
| Propagation Delay (An↔Bn) | ≤ 9.0 ns max at VCC = 3.0–3.6 V, Tamb = −40 °C to +125 °C - ensures timing compliance in high-speed bus applications |
| Output Drive Strength | ±24 mA at VCC = 3.0 V - supports driving 50 pF loads across PCB traces with minimal signal degradation |
| Operating Temperature | −40 °C to +125 °C - qualified for automotive under-hood and industrial control environments |
| Input/Output Capacitance | CI = 4.0 pF, CI/O = 5.0 pF - minimizes capacitive loading on shared bus lines |
| Power Dissipation Capacitance | CPD = 15.0 pF per latch (outputs enabled) - enables accurate dynamic power estimation in system-level thermal modeling |
Pinout & Package
DHVQFN24 package (SOT815-1), 3.5 mm × 5.5 mm × 0.85 mm body, exposed die pad (non-functional for electrical connection), 0.5 mm pitch, 24-terminal quad flat no-lead construction optimized for thermal dissipation and PCB area efficiency.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | LEBA | B-to-A latch enable (active LOW) - controls transparency/storage of B→A data path independently |
| 2 | OEBA | B-to-A output enable (active LOW) - places B-side outputs in high-impedance state when HIGH |
| 3–10 | A0–A7 | A-side bidirectional data terminals - serve as inputs when data flows B→A, outputs when A→B |
| 11 | EAB | A-to-B enable (active LOW) - enables data capture from A or output to B depending on latch state |
| 12 | GND | Ground reference - primary return path for all internal logic and I/O current |
| 13 | OEAB | A-to-B output enable (active LOW) - disables A→B outputs into high-impedance mode |
| 14 | LEAB | A-to-B latch enable (active LOW) - controls A→B latch transparency and storage timing |
| 15–22 | B7–B0 | B-side bidirectional data terminals - function as outputs during A→B transfer, inputs during B→A transfer |
| 23 | EBA | B-to-A enable (active LOW) - enables B→A data path operation |
| 24 | VCC | Positive supply voltage - powers all internal logic and output drivers; must be decoupled locally |
Key Features
| Feature | Design Value |
|---|---|
| Independent directional control | Separate LEAB/LEBA and OEAB/OEBA pins allow concurrent A→B latching and B→A output disabling - eliminates bus contention in multi-master systems |
| 5 V tolerant I/O | Inputs and outputs withstand 5.5 V regardless of VCC (1.2–3.6 V), enabling seamless integration with 5 V peripherals without external translators |
| Back-to-back register architecture | Two dedicated 8-bit D-latch banks store data in both directions simultaneously - supports pipeline staging and data buffering in real-time interfaces |
| Zero-VCC high-impedance | Outputs remain in high-Z state even when VCC = 0 V - prevents back-driving and leakage during power sequencing or hot-swap events |
| ESD robustness | HBM > 2000 V, MM > 200 V - meets industrial handling requirements and reduces need for external protection circuitry |
Applications
| Memory Expansion Interface | Industrial PLC Backplane |
|---|---|
|
Use Scenario: Expanding microcontroller address/data bus to external SRAM or Flash using shared bidirectional lines. IC Role / Device Role / Timing Role: Registered transceiver providing isolated, clock-aligned data capture and 3-state bus release between MCU and memory devices. Use Value: Eliminates timing skew between address and data phases via latch synchronization, enabling reliable 24 MHz bus operation at 3.3 V. |
Use Scenario: Interfacing multiple I/O modules to a central controller over a ruggedized parallel backplane. IC Role / Device Role / Timing Role: Directionally controlled bus buffer managing data flow between CPU and distributed I/O cards with independent enable timing. Use Value: Prevents bus contention during hot-insertion by allowing per-module OE control and latch hold during configuration handshaking. |
| Automotive Body Control Module | Test Equipment Digital Pattern Generator |
|
Use Scenario: Isolating legacy 5 V sensor interface circuitry from a 3.3 V microcontroller in a BCM. IC Role / Device Role / Timing Role: Level-translating transceiver with latch storage for debounced switch inputs and synchronized actuator command outputs. Use Value: 5 V tolerance eliminates discrete level shifters; −40 °C to +125 °C rating ensures reliability in engine bay mounting locations. |
Use Scenario: Generating precise, glitch-free stimulus patterns for IC functional testing using programmable logic controllers. IC Role / Device Role / Timing Role: Registered bus driver capturing test vectors from FPGA and presenting them synchronously to DUT pins. Use Value: 3.0 ns typical propagation delay and <1.5 ns output skew ensure sub-nanosecond timing fidelity critical for high-speed digital validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC543APWRE4 | TSSOP24 package (SOT355-1); identical logic, timing, and DC specs; 0.65 mm pitch vs. 0.5 mm | Larger footprint and lower thermal density than DHVQFN24; suitable where reworkability or legacy assembly processes dominate | Choose SN74LVC543APWRE4 if board assembly uses standard TSSOP reflow profiles and thermal constraints are less stringent. |
| 74ALVC543MTCX | Higher speed (tPD ≤ 3.5 ns typ at 3.3 V); 2.3–3.6 V supply only; no 1.2 V operation; different AC characteristics | Not suitable for ultra-low-voltage (1.2–1.8 V) systems; better for 3.3 V high-speed interconnect where minimum latency is critical | Choose 74ALVC543MTCX only when maximum speed is prioritized over wide supply range and full temperature coverage. |
Compared with SN74LVC543APWRE4 and 74ALVC543MTCX, the 74LVC543ABQ,118 uniquely combines DHVQFN24's compact thermal profile, full 1.2–3.6 V operation, and guaranteed −40 °C to +125 °C performance - making it optimal for space- and temperature-constrained embedded control designs.
Availability
74LVC543ABQ,118 is available at Aetrix Electronics and suitable for memory expansion interfaces, industrial PLC backplanes, automotive body control modules, and test equipment digital pattern generators requiring stable component supply across extended temperature ranges and high-reliability manufacturing cycles.
Supply support for 74LVC543ABQ,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, formerly Philips Semiconductors, is a global leader in high-performance mixed-signal ICs, with core expertise in automotive, industrial, and secure connectivity solutions.
The 74LVC543ABQ,118 belongs to the LVC (Low-Voltage CMOS) logic family, designed specifically for low-power, mixed-voltage digital interfacing in space-constrained and thermally demanding embedded systems.
FAQ
What is the maximum operating frequency supported by the 74LVC543ABQ,118?
The 74LVC543ABQ,118 does not specify a maximum clock frequency but delivers guaranteed propagation delay ≤9.0 ns (An↔Bn) at VCC = 3.0–3.6 V and −40 °C to +125 °C. Based on this, it supports reliable operation up to approximately 110 MHz in well-terminated, low-capacitance bus environments. Actual usable frequency depends on layout, load, and timing margins in the target system.
Can the 74LVC543ABQ,118 operate with a 1.8 V supply and interface with 5 V peripherals?
Yes. The 74LVC543ABQ,118 supports VCC from 1.2 V to 3.6 V and features 5 V tolerant inputs/outputs. At 1.8 V supply, it correctly interprets 5 V logic levels as valid HIGH inputs and safely drives 5 V-tolerant loads without damage - eliminating the need for external level-shifting components in mixed-voltage systems.
How does the latch enable (LEAB/LEBA) functionality differ from the output enable (OEAB/OEBA) in the 74LVC543ABQ,118?
In the 74LVC543ABQ,118, LEAB/LEBA controls whether data passes transparently through the respective latch bank or is captured and held on the rising edge; OEAB/OEBA independently controls whether the corresponding outputs are driven or placed in high-impedance state. This separation allows latched data retention while outputs are disabled - essential for bus arbitration and glitch-free handshaking.
Is the exposed die pad on the DHVQFN24 package of the 74LVC543ABQ,118 electrically functional?
No. Per the datasheet (Fig.2), the exposed die pad in the DHVQFN24 package (SOT815-1) is attached using conductive die attach material solely for thermal conduction and mechanical stability. It is not connected to any internal circuit node and must not be used as a supply pin, ground, or signal terminal in PCB layout.
Does the 74LVC543ABQ,118 support hot insertion or live bus swapping?
Yes. The 74LVC543ABQ,118 features zero-VCC high-impedance behavior: when VCC = 0 V, all outputs remain in high-Z state regardless of input conditions. Combined with 5 V tolerant I/O and ±20 µA max Ioff, this enables safe hot-plug operation in modular backplane systems without risk of back-powering or latch-up.
74LVC543ABQ,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74LVC
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-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-DHVQFN (5.5x3.5)
74LVC543ABQ,118 FAQ
1.How can I place an order for 74LVC543ABQ,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVC543ABQ,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 74LVC543ABQ,118 reliable?
The price and inventory of 74LVC543ABQ,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVC543ABQ,118 is usually 5 days.
3.What payment methods are accepted for 74LVC543ABQ,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVC543ABQ,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVC543ABQ,118?
74LVC543ABQ,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVC543ABQ,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 74LVC543ABQ,118?
For technical support, including 74LVC543ABQ,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVC543ABQ,118 requirements.
6.How does Aetrix verify that 74LVC543ABQ,118 is sourced from the original manufacturer or authorized distributors?
All 74LVC543ABQ,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 74LVC543ABQ,118 meets industry standards.
7.What is the process for return or replacement of 74LVC543ABQ,118?
All 74LVC543ABQ,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74LVC543ABQ,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 74LVC543ABQ,118 part is unused and in its original packaging.
Return procedure for 74LVC543ABQ,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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