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Texas Instruments SN74ABT543APWLE
- Part No.:
- SN74ABT543APWLE
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74ABT543APWLE.pdf
- Description:
- REGISTERED BUS TRANSCEIVER
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Inventory:1,000
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Product details
Overview
SN74ABT543APWLE 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 over –40°C to 85°C at 4.5–5.5 V supply. It is used in bus interface logic for industrial control backplanes and legacy system upgrades.
For engineers reviewing the SN74ABT543APWLE datasheet, SN74ABT543APWLE pinout, SN74ABT543APWLE application, or SN74ABT543APWLE equivalent, key selection criteria include its 24-pin TSSOP (PW) package, BiCMOS EPIC-II™ architecture for low power dissipation, 3.5 ns minimum LE pulse width, and compatibility with 5-V TTL-level systems requiring registered bus isolation.
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 enabling precise timing control. Its BiCMOS EPIC-II™ design delivers high-speed switching (tPLH/tPHL ≤ 6.9 ns at CL = 50 pF) while maintaining TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) and robust ESD protection (>2000 V HBM).
Output drivers support 3-state operation with active-low enables, and ground-bounce (VOLP) is specified <1 V at VCC = 5 V. Power-up/down high-impedance safety requires OE tied to VCC via pullup resistor, and unused inputs must be held static to prevent floating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across standard 5-V rail tolerances in industrial and telecom systems. |
| 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) - Supports >100 MHz bus toggle rates in synchronous interfaces. |
| Input Thresholds | VIH = 2 V, VIL = 0.8 V - Fully compatible with standard 5-V TTL logic families and mixed-voltage board designs. |
| Operating Temperature | –40°C to +85°C - Qualified for extended industrial environments including factory automation and network infrastructure. |
| ESD Rating | >2000 V HBM - Meets MIL-STD-883 Method 3015, reducing risk of handling damage in assembly lines. |
| Package | TSSOP-24 (PW) - 0.65 mm pitch, 7.8 mm × 4.4 mm footprint, suitable for high-density PCB layouts. |
Pinout & Package
TSSOP-24 (PW) package: 7.8 mm × 4.4 mm body, 0.65 mm lead pitch, 1.2 mm max height, exposed pad not present, RoHS-compliant NiPdAu finish, MSL Level-1.
| 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; latched when LEAB goes high. |
| 9, 10, 11, 12, 13, 14, 15, 16 | B1–B8 Outputs | 3-state buffered outputs reflecting A-latch contents when CEAB and OEAB are low. |
| 17 | CEAB | A-to-B chip enable (active-low); must be low to allow A-data capture or B-output activation. |
| 18 | GND | Power ground reference for all internal circuitry and I/O drivers. |
| 19 | VCC | 5-V supply input; decoupling capacitor required within 10 mm of this pin. |
| 20 | CEBA | B-to-A chip enable (active-low); enables B-input capture and A-output drive. |
| 21, 22, 23, 24 | B1–B8 Inputs / A1–A8 Outputs | Reverse-path I/O: B-side inputs feed B-latches; A-side outputs reflect B-latch state when CEBA/OEBA active. |
| 2, 23 | LEBA / LEAB | Latch-enable controls: LEAB transparently passes A→B data when low; rising edge stores. LEBA does same for B→A. |
| 1, 24 | OEBA / OEAB | Output-enable (active-low): disables B-outputs (OEAB) or A-outputs (OEBA) into high-impedance state. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 8-bit registers | Enables concurrent A↔B data transfer with separate timing control-no arbitration logic needed. |
| High-drive 3-state outputs | –32 mA source / 64 mA sink capability supports driving long traces or fan-out to ≥10 TTL loads. |
| EPIC-II™ BiCMOS process | Reduces dynamic power vs. pure bipolar while retaining speed-typical ICC = 30 mA at full toggle. |
| Low ground bounce (VOLP < 1 V) | Mitigates signal integrity issues in high-speed parallel buses by limiting simultaneous switching noise. |
| Robust input clamping | VIK = –1.2 V ensures safe operation during hot-swap or undershoot events on data lines. |
Applications
| Industrial Backplane Interface | Legacy System Bus Isolation |
|---|---|
|
Use Scenario: Isolating CPU address/data bus from peripheral expansion slots in programmable logic controllers. IC Role / Device Role / Timing Role: Registered transceiver synchronizing asynchronous peripheral access to synchronous CPU clock domain. Use Value: Prevents bus contention during hot-plug insertion and enables deterministic setup/hold timing via LEAB/LEBA edge-triggered latching. |
Use Scenario: Interfacing modern microcontrollers to legacy 8-bit ISA-style peripherals with strict timing windows. IC Role / Device Role / Timing Role: Bidirectional level-shifting and timing registration bridge between new controller and old peripheral ASICs. Use Value: Eliminates need for discrete glue logic; built-in 3-state control and CE/LE sequencing match ISA bus protocol requirements. |
| Telecom Line Card Data Multiplexing | Test Equipment Signal Routing |
|
Use Scenario: Multiplexing diagnostic data streams from multiple DSP modules onto a shared JTAG or UART debug bus. IC Role / Device Role / Timing Role: Direction-controlled data concentrator with independent enable per channel pair. Use Value: Enables software-selectable routing without FPGA reconfiguration; OEAB/OEBA allows dynamic bus sharing. |
Use Scenario: Reconfigurable signal path switching in automated test equipment (ATE) mainframes. IC Role / Device Role / Timing Role: Registered bus switch providing glitch-free path selection under microcontroller control. Use Value: Latch storage prevents metastability during rapid path changes; CEAB/CEBA enables atomic bus handoff. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT245PW | Octal non-inverting bus transceiver (no latches); 3-state only, no register functionality. | Suitable for simple direction-controlled data pass-through, not for timing-critical registered buffering. | Select SN74ABT245PW only if latch storage is unnecessary and lower propagation delay (≤5.5 ns) is prioritized. |
| SN74LVTH16245DGGR | 16-bit, 3.3-V tolerant, LVTH series; higher drive (–32/+64 mA), but no internal latches or CE/LE controls. | Designed for 3.3-V systems with mixed-voltage I/O; lacks A/B register independence and dual-enable architecture. | Choose SN74LVTH16245DGGR for 3.3-V domains requiring wider bus width, but not for 5-V registered timing control. |
Compared with SN74ABT543APWLE, SN74ABT245PW offers faster raw throughput but no data registration, while SN74LVTH16245DGGR supports 3.3-V I/O and double width but omits latch-enable logic-making SN74ABT543APWLE uniquely suited for 5-V, timing-critical, dual-path registered bus isolation.
Availability
SN74ABT543APWLE is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus isolation, telecom line card multiplexing, and test equipment signal routing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74ABT543APWLE 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 interface ICs.
The SN74ABT543A family belongs to TI's ABT logic series, engineered for 5-V TTL-compatible systems demanding registered bus control, high drive strength, and industrial-grade thermal performance.
FAQ
What is the maximum operating frequency supported by SN74ABT543APWLE?
The SN74ABT543APWLE does not specify a maximum clock frequency, but its propagation delay (tPLH/tPHL ≤ 6.9 ns at CL = 50 pF) and setup/hold times (e.g., tsu = 3.5 ns for CEAB) support reliable operation in 5-V bus systems toggling up to ~100 MHz. Actual achievable frequency depends on trace capacitance, load, and board layout.
Can SN74ABT543APWLE operate at 3.3 V?
No. The SN74ABT543APWLE is specified only for 4.5 V to 5.5 V supply operation. At 3.3 V, VIH/VIL thresholds are not met, and output drive strength collapses. For 3.3-V systems, consider TI's LVTH or LVC series alternatives instead of SN74ABT543APWLE.
How should unused inputs be handled on SN74ABT543APWLE?
Per the datasheet, all unused control inputs (CEAB, CEBA, LEAB, LEBA, OEAB, OEBA) and data inputs (A1–A8, B1–B8) must be held static-either tied to VCC or GND-to prevent floating states that cause excessive ICC or undefined output behavior. Pullup/pulldown resistors of ≤10 kΩ are recommended for control pins.
Does SN74ABT543APWLE have a thermal pad or exposed die attach pad?
No. The SN74ABT543APWLE in the PW (TSSOP-24) package has no exposed thermal pad. Thermal dissipation relies on copper planes connected to VCC/GND pins and standard PCB trace conduction. θJA is specified at 120°C/W for the PW package, confirming absence of thermal enhancement features.
Is SN74ABT543APWLE pin-compatible with SN74ABT543APWR?
Yes. SN74ABT543APWLE and SN74ABT543APWR share identical TSSOP-24 (PW) package dimensions, pinout, and electrical specifications. The "LE" suffix denotes tape-and-reel packaging with embossed carrier tape (per TI's packaging nomenclature), not a functional variant-SN74ABT543APWLE is functionally and mechanically identical to SN74ABT543APWR.
SN74ABT543APWLE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
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- Mounting Type:
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- Supplier Device Package:
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SN74ABT543APWLE FAQ
1.How can I place an order for SN74ABT543APWLE through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT543APWLE 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 SN74ABT543APWLE reliable?
The price and inventory of SN74ABT543APWLE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT543APWLE is usually 5 days.
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SN74ABT543APWLE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT543APWLE 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 SN74ABT543APWLE?
For technical support, including SN74ABT543APWLE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT543APWLE requirements.
6.How does Aetrix verify that SN74ABT543APWLE is sourced from the original manufacturer or authorized distributors?
All SN74ABT543APWLE 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 SN74ABT543APWLE meets industry standards.
7.What is the process for return or replacement of SN74ABT543APWLE?
All SN74ABT543APWLE units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT543APWLE, 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 SN74ABT543APWLE part is unused and in its original packaging.
Return procedure for SN74ABT543APWLE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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