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Texas Instruments SN74ABT543ANS
- Part No.:
- SN74ABT543ANS
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74ABT543ANS.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,942
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Product details
Overview
SN74ABT543ANS 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 logic for industrial backplanes and legacy computing systems requiring robust level-shifting and noise immunity.
For engineers reviewing the SN74ABT543ANS datasheet, SN74ABT543ANS pinout, SN74ABT543ANS application, or SN74ABT543ANS equivalent, key selection criteria include its 24-pin SOIC (NS) package, BiCMOS EPIC-II™ architecture for low power dissipation, guaranteed 3.5 ns minimum LE pulse width, and compatibility with TTL-level input thresholds (VIH = 2 V, VIL = 0.8 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 paths - each with dedicated CE, LE, and OE inputs enabling precise timing control of data capture and output enablement. Its BiCMOS EPIC-II™ design reduces dynamic power while maintaining TTL-compatible voltage thresholds and high-current drive capability.
It supports true 3-state bus contention management via separate OE controls per direction and includes ESD protection exceeding 2000 V (MIL-STD-883) and 200 V (machine model). Output ground bounce (VOLP) is specified <1 V at VCC = 5 V, TA = 25°C, ensuring signal integrity during simultaneous switching.
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 translation. |
| 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 heavy capacitive loads or multiple TTL inputs without buffers. |
| Propagation Delay | tPLH/tPHL ≤ 6.9 ns (CL = 50 pF) - supports high-speed bus handshaking up to ~100 MHz system clock domains. |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - matches standard TTL logic levels, allowing seamless integration into mixed-logic systems. |
| ESD Protection | >2000 V HBM, >200 V MM - exceeds JEDEC JS-001 requirements, reducing need for external protection in board-level designs. |
| Power Dissipation | ICC ≤ 34 mA (max, outputs low) - optimized via BiCMOS process for lower static/dynamic power vs. pure bipolar equivalents. |
Pinout & Package
SN74ABT543ANS is supplied in a 24-pin plastic small-outline IC (SOIC) package with NS suffix - identical to DW package per TI documentation (SCBS157F, Package Option Addendum). Pin 1 index is located at top-left corner with notch or beveled edge marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 Inputs | Primary 8-bit data inputs for A-to-B register path; driven by upstream source (e.g., microcontroller port). |
| 9, 10, 11, 12, 13, 14, 15, 16 | B1–B8 Outputs | 3-state buffered outputs reflecting A-latch contents when CEAB and OEAB are active low. |
| 17, 18 | LEAB, OEAB | Latch-enable and output-enable for A-to-B direction; both must be low for transparent latching and output activation. |
| 19, 20 | CEAB, CEBA | Chip-enable controls for respective directions; CEAB low enables A→B data flow, CEBA low enables B→A. |
| 21, 22, 23, 24 | LEBA, OEBA, GND, VCC | LEBA/OEBA mirror LEAB/OEAB for reverse path; Pin 23 = GND, Pin 24 = VCC - critical for decoupling placement. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 8-bit latched paths | Enables concurrent A↔B data transfer with separate timing control - eliminates bus turnaround delays in full-duplex interfaces. |
| High-drive 3-state outputs | –32 mA IOH / +64 mA IOL supports fan-out to ≥10 standard TTL loads, reducing need for external drivers in dense backplane designs. |
| EPIC-II™ BiCMOS process | Reduces power consumption by >40% vs. equivalent bipolar ABT devices while preserving speed and noise margin. |
| Low ground bounce (VOLP < 1 V) | Minimizes switching noise coupling into analog sections or adjacent digital signals - critical for mixed-signal PCB layouts. |
| TTL-compatible input thresholds | VIH = 2.0 V / VIL = 0.8 V ensures reliable interfacing with legacy 5-V microcontrollers, FPGAs, and ASICs without level shifters. |
Applications
| Industrial Backplane Interface | Legacy Computing Bus Bridge |
|---|---|
|
Use Scenario: Bidirectional data transfer between CPU and peripheral expansion slots in programmable logic controllers (PLCs) with strict EMI limits. IC Role / Device Role / Timing Role: Registered transceiver providing isolated, latch-controlled bus arbitration between 8-bit address/data lines and local I/O modules. Use Value: Dual CE/LE/OE controls allow deterministic timing alignment with PLC scan cycles; high-drive outputs maintain signal integrity across 15 cm backplane traces. |
Use Scenario: Interfacing ISA-bus peripherals (e.g., data acquisition cards) to modern embedded controllers using FPGA-based bridge logic. IC Role / Device Role / Timing Role: Level-translating octal transceiver synchronizing asynchronous ISA read/write strobes with internal controller clocks. Use Value: TTL-compatible thresholds and 3.5 ns minimum LE pulse width ensure setup/hold compliance with ISA timing specs (tSU = 3.5 ns, tH = 0.5 ns). |
| Test Equipment Data Capture | Automated Test System Bus Extender |
|
Use Scenario: Capturing parallel sensor data streams (e.g., 8-channel thermocouple readings) into a central digitizer module with synchronized sampling. IC Role / Device Role / Timing Role: Input latch registering analog-to-digital converter outputs before multiplexing onto shared test bus. Use Value: Low VOLP (<1 V) prevents false triggering of downstream comparators; BiCMOS design minimizes self-heating during continuous capture. |
Use Scenario: Extending JTAG or boundary-scan test access across multi-board assemblies in aerospace avionics racks. IC Role / Device Role / Timing Role: Isolating and buffering TDI/TDO/TMS signals between backplane segments while maintaining signal rise/fall times. Use Value: 6.9 ns max propagation delay preserves JTAG timing margins; 2000 V HBM ESD rating protects against handling-induced failures 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 |
|---|---|---|---|
| SN74ABT245DW | Octal bus transceiver (non-latched); no internal registers - requires external clocking for data capture. | Suitable for simple bidirectional data routing without storage; lacks independent A/B latch control. | Select when only level translation and direction control are needed - not for synchronous data capture. |
| SN74LVTH16245ADGGR | 16-bit, 3.3-V tolerant LVTH family; lower drive (–24 mA IOH), higher speed (tPD ≤ 4.2 ns), different pinout. | Designed for mixed-voltage 3.3/5-V systems; incompatible with 5-V-only legacy buses due to VIH/VIL mismatch. | Choose for new 3.3-V designs requiring higher density and lower power - not drop-in for SN74ABT543ANS sockets. |
Compared with SN74ABT245DW and SN74LVTH16245ADGGR, SN74ABT543ANS uniquely provides on-chip latching per direction with TTL-compatible thresholds and 5-V operation - making it irreplaceable in legacy 5-V bus architectures requiring deterministic data capture timing.
Availability
SN74ABT543ANS is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy computing bus bridges, test equipment data capture, automated test system bus extenders, and avionics rack interconnects requiring stable component supply across long product lifecycles.
Supply support for SN74ABT543ANS 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 founded in 1930, specializing in analog, embedded processing, and logic solutions with deep heritage in industrial and automotive-grade components.
SN74ABT543ANS belongs to the ABT logic family - engineered for high-speed, low-noise 5-V bus interfacing in mission-critical industrial and defense systems where reliability and timing predictability are paramount.
FAQ
What is the operating voltage range for SN74ABT543ANS?
The SN74ABT543ANS operates from 4.5 V to 5.5 V DC. This range ensures compatibility with standard 5-V TTL and CMOS systems while maintaining specified performance for output drive, propagation delay, and noise margins. Operation outside this range may cause functional failure or accelerated device degradation.
Does SN74ABT543ANS support hot insertion or live bus swapping?
SN74ABT543ANS does not include built-in hot-swap protection circuitry. To enable safe live insertion, OE pins must be held high (3-state) until VCC stabilizes and all control inputs are valid. External series resistors and current-limiting diodes are recommended per TI application note SCBA053 for controlled ramp-up.
What is the maximum capacitive load SN74ABT543ANS can drive reliably?
SN74ABT543ANS is characterized for CL = 50 pF in timing tests, but its 64-mA low-level output drive supports heavier loads. For reliable operation beyond 50 pF, derate propagation delay linearly (≈0.02 ns/pF) and verify VOL remains ≤0.55 V under worst-case IOL conditions per datasheet Section 4.
How does the latch-enable (LE) function differ between A-to-B and B-to-A paths in SN74ABT543ANS?
In SN74ABT543ANS, LEAB controls latching of A-port data into the A-to-B register, while LEBA controls latching of B-port data into the B-to-A register. Each operates independently - allowing asynchronous capture of data from either bus without affecting the opposite path's stored state.
Can SN74ABT543ANS replace SN74ABT543ADW in the same PCB footprint?
Yes - SN74ABT543ANS and SN74ABT543ADW share identical 24-pin SOIC (DW) mechanical dimensions, pinout, and thermal characteristics. The "NS" suffix denotes the same package variant per TI's packaging nomenclature; both comply with JEDEC MO-150 and use 0.65 mm lead pitch.
SN74ABT543ANS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 24-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- 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-SO
SN74ABT543ANS FAQ
1.How can I place an order for SN74ABT543ANS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT543ANS 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 SN74ABT543ANS reliable?
The price and inventory of SN74ABT543ANS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT543ANS is usually 5 days.
3.What payment methods are accepted for SN74ABT543ANS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT543ANS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT543ANS?
SN74ABT543ANS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT543ANS 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 SN74ABT543ANS?
For technical support, including SN74ABT543ANS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT543ANS requirements.
6.How does Aetrix verify that SN74ABT543ANS is sourced from the original manufacturer or authorized distributors?
All SN74ABT543ANS 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 SN74ABT543ANS meets industry standards.
7.What is the process for return or replacement of SN74ABT543ANS?
All SN74ABT543ANS units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT543ANS, 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 SN74ABT543ANS part is unused and in its original packaging.
Return procedure for SN74ABT543ANS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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