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Texas Instruments SN74ABT543ADB
- Part No.:
- SN74ABT543ADB
- Manufacturer:
- Texas Instruments
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74ABT543ADB.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,105
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Product details
Overview
SN74ABT543ADB from Texas Instruments is an octal registered transceiver with 3-state outputs, implementing dual-directional data flow control via independent A-to-B and B-to-A latch-enable and output-enable inputs. It features high-drive TTL-compatible outputs (–32 mA IOH, 64 mA IOL), operates at 4.5–5.5 V, and is rated for –40°C to 85°C industrial temperature range. It serves as a bidirectional bus interface in microprocessor peripheral expansion and memory-mapped I/O systems.
For engineers reviewing the SN74ABT543ADB datasheet, SN74ABT543ADB pinout, SN74ABT543ADB application, or SN74ABT543ADB equivalent, key selection criteria include its dual-latch architecture, 3-state output isolation timing (tPLZ ≤ 7.5 ns), ESD protection (>2000 V per MIL-STD-883), ground bounce performance (<1 V VOLP), and DB-package thermal impedance (104°C/W).
Technical Context
This device integrates two independent sets of D-type latches - one for A-to-B and one for B-to-A data paths - each with dedicated latch-enable (LEAB/LEBA) and output-enable (OEAB/OEBA) controls. The CEAB/CEBA enable inputs gate data entry and output activation, supporting transparent latch mode when LE is low and storage mode on LE↑ transition.
Its EPIC-IIB BiCMOS process delivers low power dissipation while maintaining TTL-level input thresholds (VIH = 2 V, VIL = 0.8 V) and robust drive strength. All 3-state outputs exhibit controlled turn-on/off timing (tPZH/tPLZ ≤ 8 ns) and support hot-swap-safe operation when OE is pulled up to VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL and mixed-voltage system rails. |
| IOH / IOL | –32 mA / 64 mA - drives heavy capacitive loads or multiple TTL inputs without external buffers. |
| Propagation Delay | tPLH/tPHL ≤ 6.9 ns (CL = 50 pF) - enables reliable operation in high-speed 20+ MHz bus environments. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control and communications equipment. |
| ESD Protection | >2000 V HBM - reduces risk of field failure during handling and board assembly. |
| Ground Bounce | VOLP < 1 V at VCC = 5 V - minimizes signal integrity disruption during simultaneous output switching. |
| Input Leakage | ±1 µA (control pins), ±100 µA (I/O ports) - negligible current draw simplifies biasing and reduces standby power. |
Pinout & Package
The SN74ABT543ADB uses a 24-pin Shrink Small-Outline (DB) package with 300-mil body width and gull-wing leads. Pin spacing is 0.65 mm, and package dimensions are 7.5 mm × 4.4 mm × 1.75 mm (L × W × H). Thermal resistance θJA is 104°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 Inputs | Unidirectional data inputs to A-side latches; driven by upstream logic or microcontroller port. |
| 13, 14, 15, 16, 17, 18, 19, 20 | B1–B8 I/Os | Bidirectional data terminals - function as inputs when B-to-A path enabled, outputs when A-to-B path enabled. |
| 9, 10 | LEBA, LEAB | Latch-enable controls: LEAB enables A→B transparent/storage mode; LEBA enables B→A mode. |
| 11, 12 | OEBA, OEAB | Output-enable controls: OEAB enables B outputs; OEBA enables A outputs - both active-low. |
| 21, 22 | CEBA, CEAB | Chip-enable controls: CEAB must be low to activate A→B path; CEBA low enables B→A path. |
| 23 | GND | Power ground reference for all internal circuitry and output drivers. |
| 24 | VCC | 5-V supply rail powering BiCMOS logic and output stages. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent register paths | Enables concurrent A→B and B→A data transfers with separate timing control - eliminates bus arbitration overhead. |
| High-current 3-state outputs | –32 mA source / 64 mA sink capability supports direct driving of 10+ TTL loads or termination-resistor networks. |
| Low ground bounce (VOLP) | <1 V at 5 V/25°C - preserves signal integrity in dense PCB layouts with shared ground planes. |
| EPIC-IIB BiCMOS process | Reduces static power vs. bipolar-only equivalents while retaining TTL speed and drive - ideal for thermally constrained modules. |
| MIL-STD-883 ESD rating | >2000 V HBM - meets industrial handling requirements without additional protection circuitry. |
Applications
| Microprocessor Bus Expansion | Memory-Mapped I/O Interface |
|---|---|
Use Scenario: Interfacing an 8-bit microcontroller data bus to external peripherals such as UARTs, ADCs, or display controllers. IC Role / Device Role / Timing Role: Bidirectional data register that isolates CPU address/data bus from peripheral timing domains while enabling synchronous handshaking via LE/OE controls. Use Value: Eliminates need for discrete direction-control logic and level translators; supports burst-mode transfers with sub-7-ns propagation delay. | Use Scenario: Connecting FPGA-based logic to legacy parallel memory devices (SRAM, EPROM) requiring strict read/write strobe timing. IC Role / Device Role / Timing Role: Registered transceiver providing setup/hold margin for memory address latching and data capture, with CE-driven enable gating. Use Value: Meets tsu = 3.5 ns and th = 0.5 ns requirements for 20-MHz memory access cycles without external delay elements. |
| Industrial Control Backplane | Test Equipment Signal Routing |
Use Scenario: Isolating and buffering sensor data lines across modular PLC backplanes with varying voltage domains and noise coupling. IC Role / Device Role / Timing Role: Direction-controlled bus repeater that prevents signal contention between master and slave modules using independent OE/CE control. Use Value: 3-state outputs ensure no bus conflicts during hot insertion; high ESD rating protects against field-induced failures. | Use Scenario: Reconfigurable signal path switching in automated test equipment (ATE) where DUT I/O must be dynamically routed to measurement instruments. IC Role / Device Role / Timing Role: Programmable bidirectional data register used to route stimulus/response signals under microcontroller command via LE/OE sequencing. Use Value: Sub-nanosecond hold time and fast disable times (tPLZ ≤ 7.5 ns) enable precise timing alignment in multi-channel synchronized test patterns. |
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 | Octal bus transceiver (no internal latches); requires external clocking for registered behavior. | Lacks built-in D-latches - suitable only when system-level clocking is available for external registration. | Select when lower propagation delay (tPD ≤ 5.3 ns) and reduced pin count are prioritized over latch integration. |
| SN74LVT162245DGGR | 16-bit, 3.3-V LVT logic; higher drive (–32/+64 mA), but incompatible VCC range and input thresholds. | Requires level-shifting for 5-V systems; not drop-in replaceable due to voltage and timing mismatch. | Choose only for new 3.3-V designs needing wider bus width and lower power - not for SN74ABT543ADB replacement. |
Compared with SN74ABT245DBR and SN74LVT162245DGGR, the SN74ABT543ADB uniquely integrates dual 8-bit D-latches with independent direction control, enabling self-contained registered bus interfacing at 5 V without external clock distribution or level translation - critical for legacy industrial and military subsystems.
Availability
SN74ABT543ADB is available at Aetrix Electronics and suitable for industrial control backplanes, microprocessor peripheral expansion, and memory-mapped I/O interfaces requiring stable component supply and long-term lifecycle support.
Supply support for SN74ABT543ADB 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 industrial and military-grade logic families.
The SN74ABT543ADB belongs to TI's ABT advanced BiCMOS logic family, designed specifically for high-speed, low-noise, 5-V bus interface applications demanding robust drive strength and latch-based data synchronization.
FAQ
What is the maximum operating frequency supported by the SN74ABT543ADB?
The SN74ABT543ADB does not specify a maximum clock frequency, but its propagation delay (tPLH/tPHL ≤ 6.9 ns) and setup/hold timing (tsu = 3.5 ns, th = 0.5 ns) support reliable operation in 20-MHz bus systems. System-level frequency depends on load capacitance, trace routing, and controller timing margins - actual usable rate must be validated per board layout and signal integrity analysis. The SN74ABT543ADB is optimized for burst-mode and handshaked data transfers rather than continuous clocked operation.
Can the SN74ABT543ADB operate with a 3.3-V supply?
No, the SN74ABT543ADB is specified only for 4.5 V to 5.5 V operation and is not 3.3-V tolerant. Its input thresholds (VIH = 2 V, VIL = 0.8 V) and output drive characteristics are designed for 5-V TTL compatibility. Applying 3.3 V to VCC may result in undefined logic states, insufficient output swing, or increased static current. For 3.3-V systems, consider TI's LVT or ALVC families - the SN74ABT543ADB requires level-shifting if interfaced to 3.3-V logic.
How should unused inputs be handled on the SN74ABT543ADB?
Unused control inputs (LEAB, LEBA, OEAB, OEBA, CEAB, CEBA) must be tied to a valid logic level - either VCC (for active-low signals, connect via pull-up) or GND (for active-high, though none apply here) - to prevent floating states that cause excessive current draw or metastability. Unused A/B I/O pins may be left unconnected but must not float electrically; tie to VCC or GND if noise susceptibility is a concern. This requirement is explicitly stated in the SN74ABT543ADB datasheet Note 3.
Does the SN74ABT543ADB support hot-swap or live-insertion?
The SN74ABT543ADB supports safe hot-swap operation when OE inputs are pulled up to VCC through appropriate resistors, ensuring outputs remain in high-impedance state during power-up/down transients. Its EPIC-IIB BiCMOS design and >2000-V HBM ESD rating further enhance robustness. However, full live-insertion compliance requires external current-limiting and sequencing circuitry - the SN74ABT543ADB itself provides foundational electrical safety but is not certified to IEEE 1394 or similar hot-swap standards without system-level implementation.
What is the thermal resistance (θJA) of the SN74ABT543ADB in the DB package?
For the SN74ABT543ADB in the 24-pin Shrink Small-Outline (DB) package, the junction-to-ambient thermal resistance θJA is 104°C/W under standard JEDEC JESD51-2 test conditions. This value assumes a 1-inch² copper pad on the PCB with no internal layers. Actual thermal performance depends on PCB layout, copper area, airflow, and adjacent heat sources - derating is recommended above 70°C ambient. The SN74ABT543ADB's BiCMOS process inherently reduces power dissipation versus older bipolar logic, aiding thermal management.
SN74ABT543ADB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 24-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- 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
SN74ABT543ADB FAQ
1.How can I place an order for SN74ABT543ADB through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT543ADB 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 SN74ABT543ADB reliable?
The price and inventory of SN74ABT543ADB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT543ADB is usually 5 days.
3.What payment methods are accepted for SN74ABT543ADB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT543ADB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT543ADB?
SN74ABT543ADB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT543ADB 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 SN74ABT543ADB?
For technical support, including SN74ABT543ADB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT543ADB requirements.
6.How does Aetrix verify that SN74ABT543ADB is sourced from the original manufacturer or authorized distributors?
All SN74ABT543ADB 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 SN74ABT543ADB meets industry standards.
7.What is the process for return or replacement of SN74ABT543ADB?
All SN74ABT543ADB units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT543ADB, 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 SN74ABT543ADB part is unused and in its original packaging.
Return procedure for SN74ABT543ADB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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