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NXP Semiconductors 74LVC543ABQ,115
- Part No.:
- 74LVC543ABQ,115
- Manufacturer:
- NXP Semiconductors
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
74LVC543ABQ,115.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 24DHVQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,958
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Product details
Overview
74LVC543ABQ,115 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/Os, propagation delay of 3.0 ns (typ. at VCC = 3.3 V, CL = 50 pF), and −40 °C to +125 °C temperature range - used for bidirectional data buffering in low-voltage microcontroller buses and FPGA I/O expansion.
For engineers reviewing the 74LVC543ABQ,115 datasheet, 74LVC543ABQ,115 pinout, 74LVC543ABQ,115 application, or 74LVC543ABQ,115 equivalent, key selection considerations include independent A→B/B→A latch enable (LEAB/LEBA) and output enable (OEAB/OEBA) controls, DHVQFN24 package thermal performance, 3-state timing (tPZH/tPHZ ≤ 7.7 ns typ.), and JEDEC JESD8-B compliance for mixed-voltage system interfacing.
Technical Context
The 74LVC543ABQ,115 implements two independent 8-bit D-type latch banks - one for A-to-B direction, one for B-to-A - each with dedicated latch enable (LEXX) and output enable (OEXX) inputs, enabling precise control over data capture and bus release timing. Its back-to-back register architecture supports transparent, latched, and high-impedance modes per direction without cross-talk.
It operates across a wide VCC range (1.2 V–3.6 V) while maintaining 5 V tolerant I/Os, allowing direct interfacing between 3.3 V logic and legacy 5 V peripherals. The device complies with JEDEC JESD8-B/JESD36 standards and features ESD protection exceeding 2000 V HBM and 200 V MM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.2 V to 3.6 V - enables operation in battery-powered and multi-rail embedded systems without level shifters. |
| I/O Voltage Tolerance | Up to 5.5 V - allows safe connection to 5 V buses while powered from 1.2–3.6 V supplies. |
| Propagation Delay | 3.0 ns typical (An↔Bn, VCC = 3.3 V, CL = 50 pF) - supports >100 MHz bus clocking in synchronous applications. |
| 3-State Enable/Disable Time | tPZH ≤ 7.7 ns, tPHZ ≤ 7.0 ns (typ., VCC = 3.3 V) - minimizes bus turnaround latency in bidirectional protocols. |
| Operating Temperature | −40 °C to +125 °C - qualified for automotive under-hood and industrial control environments. |
| Input Capacitance | CI = 4.0 pF - reduces capacitive loading on driving sources, preserving signal integrity on dense PCB traces. |
| Power Dissipation Capacitance | CPD = 15.0 pF per latch (outputs enabled) - enables accurate dynamic power estimation in high-speed switching. |
Pinout & Package
DHVQFN24 (SOT815-1) package: 3.5 mm × 5.5 mm × 0.85 mm body, exposed die pad (non-functional), 0.5 mm pitch, 24-terminal quad flat no-lead construction optimized for thermal dissipation and high-density routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | LEBA | B-to-A latch enable (active LOW) - controls data capture from B-side inputs into B→A latches. |
| 2 | OEBA | B-to-A output enable (active LOW) - activates 3-state B→A outputs when asserted. |
| 3–10 | A0–A7 | A-side bidirectional data terminals - serve as inputs during A→B transfer, outputs during B→A transfer. |
| 11 | EAB | A-to-B enable (active LOW) - gates data flow path from A to B registers and outputs. |
| 12 | GND | Ground reference - common return for all signals and power; connects to exposed die pad. |
| 13 | OEAB | A-to-B output enable (active LOW) - enables 3-state A→B outputs when LOW. |
| 14 | LEAB | A-to-B latch enable (active LOW) - captures A-side data into A→B latches on rising edge. |
| 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 through latches and outputs. |
| 24 | VCC | Positive supply - powers internal logic; must be decoupled near pin with 100 nF ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Independent directional control | Separate LEAB/OEAB and LEBA/OEBA pins allow asynchronous A→B and B→A data transfers without bus contention. |
| 5 V tolerant I/Os | VI up to 5.5 V with VI < 0 V or VO > VCC limited to ±50 mA - eliminates external level shifters in mixed-voltage systems. |
| Back-to-back latching | Two sets of octal D-latches store data in both directions simultaneously - enables pipeline-style data staging. |
| Zero-power high-impedance | Outputs enter high-Z state even when VCC = 0 V - prevents back-driving during power sequencing or hot-swap events. |
| JEDEC-compliant interface | Fully compliant with JESD8-B and JESD36 - ensures interoperability with industry-standard 3.3 V/5 V logic families. |
Applications
| Microcontroller Bus Expansion | FPGA I/O Bridging |
|---|---|
|
Use Scenario: Extending GPIO count of an ARM Cortex-M4 MCU by connecting parallel peripheral interfaces (e.g., LCD controller, SRAM) via shared address/data bus. IC Role / Device Role / Timing Role: Bidirectional registered transceiver managing time-multiplexed A→B (MCU → peripheral) and B→A (peripheral → MCU) data flow with latch synchronization. Use Value: Enables deterministic setup/hold timing (tsu = +1.5 ns, th = 0.6 ns at VCC = 3.3 V) and eliminates bus contention during direction switching. |
Use Scenario: Interfacing a Xilinx Artix-7 FPGA's 3.3 V bank to legacy 5 V industrial sensors and actuators using a shared parallel control bus. IC Role / Device Role / Timing Role: Voltage-tolerant bus transceiver providing level translation and direction-controlled data staging between FPGA and external devices. Use Value: 5 V I/O tolerance and 3.0 ns propagation delay ensure reliable communication without external level shifters or timing margin loss. |
| Automotive Body Control Module | Industrial PLC I/O Subsystem |
|
Use Scenario: Isolating and buffering CAN controller data lines and discrete I/O status signals within an automotive BCM operating across −40 °C to +125 °C ambient. IC Role / Device Role / Timing Role: Registered transceiver with latch storage for synchronized sampling of sensor inputs and controlled output updates to driver ICs. Use Value: −40 °C to +125 °C qualification and 2000 V HBM ESD rating meet AEC-Q100 stress requirements for under-hood electronics. |
Use Scenario: Managing parallel digital I/O between a real-time Linux-based PLC CPU and modular I/O cards in a DIN-rail mounted control cabinet. IC Role / Device Role / Timing Role: High-speed bidirectional bus buffer with independent direction enables and 3-state control for hot-swappable I/O modules. Use Value: DHVQFN24 package provides superior thermal resistance (RθJA ≈ 50 K/W) vs. SO24, supporting sustained 24 MHz bus operation in convection-cooled enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC823APWRE4 | 10-bit registered transceiver with single-direction latch enable; no separate OE per direction; TSSOP24 package. | Lacks independent B→A output enable - requires external gating for asymmetric bus control. | Select when full 8-bit bidirectional independence is unnecessary and board space permits TSSOP24 footprint. |
| 74ALVC162245DGGR | 16-bit non-registered transceiver; 3.3 V only (no 1.2 V support); higher drive strength (±24 mA); VQFN48 package. | No internal latching - unsuitable for synchronous data capture; better for raw throughput than timing-critical staging. | Choose for high-current, unidirectional or simple bidirectional buffering where latch functionality is handled externally. |
Compared with SN74LVC823APWRE4 and 74ALVC162245DGGR, the 74LVC543ABQ,115 uniquely delivers per-direction latch and output enable control in a thermally enhanced 24-pin QFN, making it optimal for deterministic, low-latency bidirectional bus staging in space-constrained industrial and automotive designs.
Availability
74LVC543ABQ,115 is available at Aetrix Electronics and suitable for microcontroller bus expansion, FPGA I/O bridging, automotive body control modules, and industrial PLC I/O subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74LVC543ABQ,115 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 analog, logic, and interface solutions for automotive, industrial, and communications markets.
The 74LVC543ABQ,115 belongs to the LVC (Low-Voltage CMOS) logic family, designed specifically for low-power, mixed-voltage system interfacing with robust noise immunity and rail-to-rail operation down to 1.2 V.
FAQ
What is the maximum operating frequency supported by the 74LVC543ABQ,115?
The 74LVC543ABQ,115 does not specify a maximum clock frequency directly, but its typical propagation delay of 3.0 ns (An↔Bn, VCC = 3.3 V, CL = 50 pF) supports reliable operation in systems with bus cycle times ≥ 6 ns. For synchronous latch control, minimum LEAB/LEBA pulse width is 3.0 ns (typ.), enabling effective use in >100 MHz data staging applications when combined with appropriate setup/hold margins.
Can the 74LVC543ABQ,115 operate at 1.2 V supply voltage?
Yes, the 74LVC543ABQ,115 is fully specified for operation from 1.2 V to 3.6 V. At 1.2 V, DC parameters such as VIH (≥ VCC) and VOL (≤ 0.3 V) remain valid, and AC timing (e.g., tPHL/tPLH ≤ 15 ns max) is guaranteed across −40 °C to +125 °C - making it suitable for ultra-low-power portable and energy-harvesting systems.
Is the exposed pad on the DHVQFN24 package of the 74LVC543ABQ,115 electrically functional?
No, the exposed die pad on the 74LVC543ABQ,115's SOT815-1 package is mechanically attached to the die substrate using conductive die attach material but is not connected to any internal circuit node. It must be soldered to a PCB thermal pad for heat dissipation but should not be tied to VCC, GND, or any signal - doing so may cause malfunction or damage.
How does the 74LVC543ABQ,115 handle power-off conditions?
The 74LVC543ABQ,115 features zero-power high-impedance behavior: when VCC = 0 V, all outputs enter a high-impedance state regardless of input levels, preventing back-driving of powered circuitry. Power-off leakage current (Ioff) is ≤ ±20 µA (max at VCC = 0 V), ensuring safe hot-swap and partial-power-down operation in modular systems.
What are the recommended decoupling practices for the 74LVC543ABQ,115?
Place a 100 nF X7R ceramic capacitor between VCC (pin 24) and GND (pin 12) as close as possible to the device - ideally within 3 mm trace length. For systems with multiple 74LVC543ABQ,115 units or high di/dt loads, add a 4.7 µF bulk capacitor per 4–6 devices. Avoid shared vias between decoupling caps and GND pins to minimize inductance.
74LVC543ABQ,115 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,115 FAQ
1.How can I place an order for 74LVC543ABQ,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVC543ABQ,115 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,115 reliable?
The price and inventory of 74LVC543ABQ,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVC543ABQ,115 is usually 5 days.
3.What payment methods are accepted for 74LVC543ABQ,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVC543ABQ,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVC543ABQ,115?
74LVC543ABQ,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVC543ABQ,115 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,115?
For technical support, including 74LVC543ABQ,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVC543ABQ,115 requirements.
6.How does Aetrix verify that 74LVC543ABQ,115 is sourced from the original manufacturer or authorized distributors?
All 74LVC543ABQ,115 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,115 meets industry standards.
7.What is the process for return or replacement of 74LVC543ABQ,115?
All 74LVC543ABQ,115 units undergo pre-shipment inspection (PSI). If there is an issue with 74LVC543ABQ,115, 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,115 part is unused and in its original packaging.
Return procedure for 74LVC543ABQ,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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