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Texas Instruments SN74ABT543ADBR
- Part No.:
- SN74ABT543ADBR
- Manufacturer:
- Texas Instruments
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74ABT543ADBR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,954
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Product details
Overview
SN74ABT543ADBR from Texas Instruments is an octal registered transceiver with 3-state outputs, designed for bidirectional data flow control between two 8-bit buses. It features dual independent latch-enable (LEAB/LEBA) and output-enable (OEAB/OEBA) controls, high-drive outputs (–32 mA IOH, 64 mA IOL), and operates at 4.5–5.5 V over –40°C to 85°C. It is used in bus interface applications requiring temporary data storage and direction-controlled isolation.
For engineers reviewing the SN74ABT543ADBR datasheet, SN74ABT543ADBR pinout, SN74ABT543ADBR application, or SN74ABT543ADBR equivalent, key selection criteria include its 24-pin SSOP (DB) package, BiCMOS EPIC-IIB process enabling low power dissipation, 3-state output timing (tPLZ ≤ 7.0 ns), and compatibility with TTL-level logic systems requiring robust drive strength and ground-bounce mitigation (VOLP < 1 V).
Technical Context
This device implements two independent 8-bit D-type latch registers-one for A-to-B and one for B-to-A data flow-each with dedicated CE, LE, and OE inputs. Its EPIC-IIB BiCMOS architecture delivers high-speed switching (tPLH/tPHL ≤ 6.9 ns at CL = 50 pF) while maintaining low static current (ICC ≤ 30 mA) and strong noise immunity (VIH = 2 V, VIL = 0.8 V).
It supports true 3-state output control with separate enable paths per direction, allowing simultaneous latching on one side while holding the other in high-impedance. Input clamp protection exceeds 2000 V (MIL-STD-883), and output ground bounce is specified below 1 V at VCC = 5 V and TA = 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL and CMOS systems without level-shifting. |
| Operating Temperature | –40°C to +85°C - qualified for commercial and industrial environments, excluding extended military range. |
| Output Drive | –32 mA IOH / +64 mA IOL - enables direct driving of multiple TTL loads or termination-resistor networks. |
| Propagation Delay | tPLH/tPHL ≤ 6.9 ns (CL = 50 pF) - supports high-speed bus handshaking up to ~100 MHz system timing margins. |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - matches standard TTL logic levels for seamless interfacing with legacy controllers and FPGAs. |
| 3-State Enable Time | tPZH ≤ 8.4 ns, tPLZ ≤ 8.0 ns - guarantees fast bus release and acquisition during direction switching in multiplexed architectures. |
| ESD Protection | >2000 V HBM - reduces risk of field failure during handling and board assembly in uncontrolled environments. |
Pinout & Package
SN74ABT543ADBR is housed in a 24-pin Shrink Small-Outline Package (SSOP-DB), 0.65 mm pitch, 7.9 mm × 4.5 mm body, 1.2 mm max height, RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 Inputs | 8-bit data inputs for A-side latching; driven by upstream source (e.g., microcontroller port or memory bus). |
| 9–16 | B1–B8 Outputs | 8-bit 3-state outputs sourced from A-latches when CEAB and OEAB are active low. |
| 17 | CEAB | A-to-B chip enable - must be low to allow A-data capture or B-output activation. |
| 18 | GND | Power ground reference for all internal logic and output drivers. |
| 19 | VCC | Positive supply (4.5–5.5 V); powers BiCMOS output stage and register logic. |
| 20 | CEBA | B-to-A chip enable - controls B-input capture and A-output activation independently. |
| 21–24 | B1–B8 Inputs / A1–A8 Outputs | 8-bit bidirectional terminals - function as inputs when CEBA active, outputs when OEBA active. |
| 2, 23 | LEBA, LEAB | Latch-enable clocks - transparent on low, store on rising edge; decouples data capture from output enable timing. |
| 1, 22 | OEBA, OEAB | 3-state output enables - active-low control of B- or A-side driver output state (high-Z when high). |
Key Features
| Feature | Design Value |
|---|---|
| EPIC-IIB BiCMOS Process | Reduces dynamic power vs. pure bipolar while retaining TTL-compatible drive strength and speed. |
| Independent Direction Control | Separate CE/LE/OE pins per direction enable concurrent A→B latching and B→A hold without contention. |
| High-Drive 3-State Outputs | –32 mA / +64 mA drive supports fan-out to ≥10 standard TTL loads or parallel bus termination. |
| Low Ground Bounce | VOLP < 1 V at 5 V/25°C ensures signal integrity during simultaneous output switching in dense PCB layouts. |
| Robust ESD Protection | Exceeds 2000 V HBM and 200 V MM - eliminates need for external TVS diodes in most board-level ESD scenarios. |
Applications
| Industrial PLC Backplane Interface | Embedded Microcontroller Bus Expansion |
|---|---|
Use Scenario: Isolating and buffering address/data lines between CPU module and I/O expansion cards in modular automation racks. IC Role / Device Role / Timing Role: Bidirectional registered transceiver managing time-multiplexed bus arbitration with latch synchronization to prevent metastability. Use Value: Enables deterministic data transfer across hot-swappable slots using independent CE/LE timing, reducing inter-slot skew and eliminating bus contention during reconfiguration. | Use Scenario: Extending 8-bit parallel interface from an MCU GPIO port to external peripherals (e.g., LCD controller, ADC FIFO, or SRAM bank). IC Role / Device Role / Timing Role: Registered bus transceiver providing setup/hold margin for slow peripherals while maintaining full-speed CPU operation. Use Value: Allows CPU to write data into A-latches asynchronously, then strobe it to peripheral via B-outputs with precise timing control - improving throughput vs. software bit-banging. |
| Legacy System Data Migration Bridge | Test Equipment Digital Pattern Generator |
Use Scenario: Interfacing modern FPGA-based test controllers with legacy 5-V TTL instrumentation buses (e.g., GPIB auxiliary lines or IEEE-488 handshaking signals). IC Role / Device Role / Timing Role: Level-translation-capable registered transceiver ensuring voltage- and timing-compliant handshake signal regeneration. Use Value: Matches TTL input thresholds and provides 64-mA sink capability to drive long cables or multiple legacy receivers without external buffers. | Use Scenario: Generating synchronized 8-bit stimulus patterns in automated test equipment where pattern stability and glitch-free output transitions are critical. IC Role / Device Role / Timing Role: Registered output buffer holding pattern data until triggered by external strobe, then releasing it with controlled 3-state timing. Use Value: Eliminates pattern glitches during state changes by decoupling load timing from generation clock - essential for jitter-sensitive DUT stimulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT245DBR | Non-latched, flow-through 8-bit transceiver; no internal register storage; lower propagation delay (tPLH ≤ 5.5 ns). | Suitable only where real-time pass-through is required; cannot hold data during bus arbitration or clock domain crossing. | Select SN74ABT245DBR when latch functionality is unnecessary and minimal latency is prioritized over data staging. |
| SN74LVTH16245DGGR | 16-bit, 3.3-V-only, latch-free; LVTH series offers lower power but no 5-V tolerance or registered operation. | Requires level-shifting for 5-V systems; lacks independent direction latching - unsuitable for asynchronous bus bridging. | Choose SN74LVTH16245DGGR only in new 3.3-V designs needing higher channel count and lower ICC, not as drop-in replacement. |
Compared with SN74ABT245DBR and SN74LVTH16245DGGR, SN74ABT543ADBR uniquely provides dual-direction registered storage in a 5-V tolerant 24-pin SSOP package - making it irreplaceable in applications requiring deterministic data hold, bus isolation timing control, and legacy TTL interoperability.
Availability
SN74ABT543ADBR is available at Aetrix Electronics and suitable for industrial PLC backplanes, embedded microcontroller bus expansion, legacy system data migration bridges, and test equipment digital pattern generators requiring stable component supply and long-term manufacturability.
Supply support for SN74ABT543ADBR 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 decades of heritage in high-reliability logic families.
The ABT logic family-including SN74ABT543ADBR-is engineered for high-speed, low-noise 5-V bus interface applications demanding robust drive strength, latch-controlled timing, and industrial temperature operation.
FAQ
What is the maximum operating frequency supported by SN74ABT543ADBR?
SN74ABT543ADBR does not specify a maximum clock frequency, but its worst-case propagation delay (tPLH/tPHL ≤ 6.9 ns at CL = 50 pF) supports reliable operation in systems with bus cycle times ≥15 ns. Actual usable frequency depends on layout, load capacitance, and timing margins for setup/hold requirements - typical use cases operate up to 60–80 MHz with conservative design margins.
Can SN74ABT543ADBR operate at 3.3 V?
No. SN74ABT543ADBR is specified only for 4.5 V to 5.5 V supply operation. At 3.3 V, VIH/VIL thresholds and output drive performance fall outside guaranteed specifications; attempting 3.3-V operation may result in unreliable logic levels or excessive ICC. For 3.3-V systems, consider TI's LVTH or LVC families instead.
How should unused control inputs (e.g., CEBA, OEBA) be handled on SN74ABT543ADBR?
Unused control inputs on SN74ABT543ADBR must be held static - either tied to VCC (for disable) or GND (for enable) - to prevent floating states that cause undefined output behavior or increased ICC. TI explicitly recommends this in the datasheet (Note 3) to avoid oscillation, noise coupling, or excessive power draw due to indeterminate input voltage.
Does SN74ABT543ADBR support hot-swap or live-insertion?
SN74ABT543ADBR is not hot-swap rated. While its Ioff specification (±100 µA at VCC = 0) limits backdrive current, it lacks built-in power sequencing control, slew-rate limiting, or bus-fault protection. Safe hot-swap requires external circuitry (e.g., current-limiting resistors, soft-start controllers) and validation per system-level requirements - TI does not guarantee safe insertion under power.
What is the thermal resistance (θJA) of the SN74ABT543ADBR package?
The SN74ABT543ADBR uses the DB (SSOP) package, which has a specified junction-to-ambient thermal resistance (θJA) of 104°C/W under JEDEC JESD51-2 conditions. This value assumes standard 2-layer board layout with minimal copper; actual θJA improves significantly with added thermal vias and copper pour, especially important given its max ICC of 30 mA and 64-mA output sink capability.
SN74ABT543ADBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- 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:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
SN74ABT543ADBR FAQ
1.How can I place an order for SN74ABT543ADBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT543ADBR 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 SN74ABT543ADBR reliable?
The price and inventory of SN74ABT543ADBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT543ADBR is usually 5 days.
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4.How is shipping managed for SN74ABT543ADBR?
SN74ABT543ADBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT543ADBR 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 SN74ABT543ADBR?
For technical support, including SN74ABT543ADBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT543ADBR requirements.
6.How does Aetrix verify that SN74ABT543ADBR is sourced from the original manufacturer or authorized distributors?
All SN74ABT543ADBR 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 SN74ABT543ADBR meets industry standards.
7.What is the process for return or replacement of SN74ABT543ADBR?
All SN74ABT543ADBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT543ADBR, 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 SN74ABT543ADBR part is unused and in its original packaging.
Return procedure for SN74ABT543ADBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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