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Texas Instruments SN74LVC543ADBR
- Part No.:
- SN74LVC543ADBR
- Manufacturer:
- Texas Instruments
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVC543ADBR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,582
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Product details
Overview
SN74LVC543ADBR from Texas Instruments is an octal registered transceiver with 3-state outputs, designed for bidirectional data flow between two 8-bit buses in mixed-voltage systems. It operates from 1.65 V to 3.6 V, supports 5.5-V-tolerant inputs, delivers 7-ns max propagation delay at 3.3 V, and features independent A-to-B and B-to-A latch-enable and output-enable controls. It is used in bus interface logic for FPGA-to-microcontroller communication in industrial control modules.
For engineers reviewing the SN74LVC543ADBR datasheet, SN74LVC543ADBR pinout, SN74LVC543ADBR application, or SN74LVC543ADBR equivalent, key selection criteria include voltage translation capability (3.3-V VCC with 5-V input tolerance), Ioff partial-power-down support, independent directional control via CE/LE/OE signals, and SSOP-24 package compatibility with high-density PCB layouts.
Technical Context
This device implements dual 8-bit D-type latches with separate enable paths for A↔B data flow: CEAB/LEAB/OEAB govern A-to-B operation, while CEBA/LEBA/OEBA control B-to-A direction. Each register operates transparently when its LE is low and stores data on the low-to-high LE edge.
It supports mixed-mode signal operation - inputs accept up to 5.5 V regardless of VCC (1.65–3.6 V), enabling safe interfacing between 3.3-V logic and legacy 5-V peripherals. The Ioff circuit disables outputs during power-down to prevent back-current, satisfying JESD 78 Class II latch-up requirements (>250 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - enables direct integration into modern low-voltage digital systems without level-shifting circuitry. |
| Input Voltage Tolerance | Up to 5.5 V - allows connection to 5-V sources without external clamping or resistors in mixed-voltage bus interfaces. |
| Max Propagation Delay | 7 ns at VCC = 3.3 V - ensures timing compliance in high-speed 8-bit parallel data transfers up to ~100 MHz system clock domains. |
| Ioff Current | ±10 µA at VI/VO = 5.5 V - guarantees safe isolation during partial power-down, preventing current backflow into unpowered sections. |
| Output Drive Strength | ±24 mA at VCC = 3.0 V - supports driving multiple LVC loads or moderate capacitive bus stubs (≤30 pF) without signal degradation. |
| Latch-Up Immunity | >250 mA per JESD 17 - meets industrial-grade robustness requirements for operation in electrically noisy environments. |
| 3-State Enable Time | 7.5 ns max (CE→output active) - enables precise synchronization with system control signals in real-time data gating applications. |
Pinout & Package
The SN74LVC543ADBR is housed in a 24-pin SSOP (Shrink Small-Outline Package), DB package type, with 0.65-mm lead pitch, 7.9-mm body width, and 1.2-mm maximum height - optimized for space-constrained industrial PCBs requiring thermal and mechanical reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 13, 24 | VCC, GND, OEBA | VCC powers both registers; GND is common reference; OEBA enables 3-state output for B-side signals only. |
| 2, 23 | OEAB, CEBA | OEAB activates A-to-B outputs; CEBA enables B-to-A data capture and output - both must be asserted for bidirectional operation. |
| 3, 22 | LEAB, LEBA | LEAB latches A-port data into A-to-B register; LEBA latches B-port data into B-to-A register - edge-triggered storage control. |
| 4–11 | A1–A8 | 8-bit input/data port A - accepts 5.5-V-tolerant signals and drives internal A-latches when CEAB/LEAB are active. |
| 14–21 | B1–B8 | 8-bit output/data port B - delivers latched A-data (when OEAB low) or drives B-data to A-port (when OEBA low and CEBA active). |
| 12 | CEAB | A-to-B channel enable - must be low to allow A-input sampling or B-output activation; high forces B-outputs into high-impedance state. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-voltage interface support | 5.5-V-tolerant inputs with 1.65–3.6-V VCC - eliminates external level shifters when connecting 3.3-V FPGAs to 5-V legacy peripherals. |
| Independent directional control | Dedicated CE/LE/OE pins per direction - enables asymmetric data flow (e.g., A→B streaming while B→A polling) without contention. |
| Ioff partial-power-down protection | Outputs disabled with leakage <±10 µA during VCC=0 - prevents back-driving in hot-swap or modular power-rail designs. |
| Low ground bounce & undershoot | VOLP <0.8 V and VOHV >2 V at VCC=3.3 V - maintains signal integrity across noisy shared ground planes in multi-transceiver systems. |
| High noise immunity | VIL=0.35×VCC (min) and VIH=0.65×VCC (max) - provides ≥0.5-V noise margin at 3.3-V operation, reducing false triggering in EMI-prone enclosures. |
Applications
| Industrial PLC Backplane Interface | FPGA-to-Microcontroller Data Bridge |
|---|---|
Use Scenario: Bidirectional data exchange between a 3.3-V FPGA and a 5-V microcontroller on a programmable logic controller backplane with shared power domains. IC Role / Device Role / Timing Role: Octal registered transceiver providing synchronized, isolated A↔B data transfer with independent latch and output control per direction. Use Value: Enables reliable 8-bit parallel communication without level shifters or bus contention, leveraging 5.5-V input tolerance and Ioff for safe power sequencing. | Use Scenario: High-speed configuration data loading from an FPGA to an ARM Cortex-M7 MCU during boot, followed by runtime status reporting from MCU to FPGA. IC Role / Device Role / Timing Role: Registered transceiver acting as a timing-controlled, direction-switchable data conduit with 7-ns propagation delay and edge-triggered latching. Use Value: Guarantees setup/hold timing compliance for both read and write cycles, eliminating metastability risk in tightly timed boot sequences. |
| Legacy Peripheral Adapter Module | Modular Sensor Hub Interconnect |
Use Scenario: Adapting a 5-V parallel sensor array (e.g., optical encoder, analog front-end) to a 3.3-V SoC-based controller board in factory automation equipment. IC Role / Device Role / Timing Role: Voltage-translating transceiver with 3-state outputs, allowing dynamic bus sharing among multiple sensor modules. Use Value: Eliminates need for discrete MOSFET translators or dedicated level-shifter ICs, reducing BOM count and layout area in compact adapter PCBs. | Use Scenario: Aggregating data from eight analog sensor nodes onto a central processing module using a shared 8-bit parallel bus with hot-plug capability. IC Role / Device Role / Timing Role: Bidirectional registered buffer supporting partial power-down of inactive sensor modules while maintaining bus integrity. Use Value: Ioff protection prevents current leakage from powered modules into unpowered sensor slots, ensuring stable operation during field maintenance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC543APWR | TSSOP-24 package (PW), same electrical specs, 2000-piece reel packaging | Identical functionality but different footprint - requires PCB redesign due to smaller pad pitch (0.65 mm vs. SSOP's 0.65 mm, but different body dimensions) | Select when targeting higher board density and automated assembly with TSSOP-compatible pick-and-place tooling. |
| SN74LVC543ADWR | SOIC-24 package (DW), same electrical specs, 2000-piece reel packaging | Wider body (7.5-mm vs. SSOP's 5.3-mm width), larger pad pitch (1.27 mm), lower thermal resistance (θJA = 46°C/W) | Select when thermal performance is critical or legacy SOIC footprints must be retained without layout revision. |
Compared with SN74LVC543ADBR, the SN74LVC543APWR offers identical logic and timing but demands TSSOP-specific layout changes, while SN74LVC543ADWR trades compactness for easier hand-soldering and better heat dissipation - choice depends on assembly process, thermal budget, and board space constraints.
Availability
SN74LVC543ADBR is available at Aetrix Electronics and suitable for industrial PLC backplanes, FPGA-to-MCU bridges, and legacy peripheral adapter modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant SSOP packaging.
Supply support for SN74LVC543ADBR 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with over 50 years of innovation in high-reliability interface and power management ICs.
The SN74LVC543ADBR belongs to TI's LVC logic family - engineered for low-voltage, high-speed, mixed-signal interoperability in industrial, automotive, and communications infrastructure applications.
FAQ
What is the maximum operating temperature range for the SN74LVC543ADBR?
The SN74LVC543ADBR is rated for operation from –40°C to +85°C ambient temperature, meeting industrial-grade environmental requirements. This range is validated across all electrical parameters including propagation delay, drive strength, and input thresholds, and applies specifically to the SSOP-24 (DB) package variant as documented in TI's SCAS299H datasheet revision March 2005.
Does the SN74LVC543ADBR support true bidirectional data flow without external logic?
Yes, the SN74LVC543ADBR supports fully independent bidirectional data flow using dedicated control signals: CEAB/LEAB/OEAB manage A-to-B transfer, while CEBA/LEBA/OEBA handle B-to-A transfer. No external gates or timing logic are needed - each direction operates autonomously, enabling simultaneous or staggered transfers as required by the system architecture.
Can the SN74LVC543ADBR be used with a 5-V microcontroller while powered at 3.3 V?
Yes, the SN74LVC543ADBR accepts input voltages up to 5.5 V regardless of VCC (1.65–3.6 V), making it compatible with 5-V microcontrollers when powered at 3.3 V. Its outputs swing rail-to-rail within the 3.3-V domain, so downstream 3.3-V receivers see valid logic levels - no external pull-ups or clamps are required for this mixed-voltage interface.
What is the purpose of the Ioff feature in the SN74LVC543ADBR?
The Ioff feature in the SN74LVC543ADBR disables all outputs and limits leakage current to ±10 µA when VCC = 0 V, preventing damaging current backflow from live bus lines into a powered-down section of the system. This is essential for hot-swap capability, modular power domains, and partial-power-down modes in industrial controllers where subsystems may be powered independently.
Is the SN74LVC543ADBR pinout compatible with other 24-pin transceivers like the 74ACT543?
No, the SN74LVC543ADBR pinout is not compatible with 74ACT543 or other legacy transceivers. Its SSOP-24 (DB) pin assignment - including dedicated CE/LE/OE per direction and specific A/B port mapping - is unique to the LVC543A family. Substitution requires full schematic and layout review; no pin-to-pin replacement exists outside TI's LVC543A variants (e.g., SN74LVC543APWR).
SN74LVC543ADBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 24-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
SN74LVC543ADBR FAQ
1.How can I place an order for SN74LVC543ADBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC543ADBR 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 SN74LVC543ADBR reliable?
The price and inventory of SN74LVC543ADBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC543ADBR is usually 5 days.
3.What payment methods are accepted for SN74LVC543ADBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC543ADBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC543ADBR?
SN74LVC543ADBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC543ADBR 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 SN74LVC543ADBR?
For technical support, including SN74LVC543ADBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC543ADBR requirements.
6.How does Aetrix verify that SN74LVC543ADBR is sourced from the original manufacturer or authorized distributors?
All SN74LVC543ADBR 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 SN74LVC543ADBR meets industry standards.
7.What is the process for return or replacement of SN74LVC543ADBR?
All SN74LVC543ADBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC543ADBR, 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 SN74LVC543ADBR part is unused and in its original packaging.
Return procedure for SN74LVC543ADBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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