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Texas Instruments SN74ABT543APWR
- Part No.:
- SN74ABT543APWR
- Manufacturer:
- Texas Instruments
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ABT543APWR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:640
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Product details
Overview
SN74ABT543APWR 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 capability (–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 SN74ABT543APWR datasheet, SN74ABT543APWR pinout, SN74ABT543APWR application, or SN74ABT543APWR equivalent, key selection considerations include its TSSOP-24 package, 3-state bidirectional latching behavior, propagation delays down to 1.8 ns (tPLH), output drive strength, and compatibility with 5-V TTL-level systems.
Technical Context
The SN74ABT543APWR 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 EPIC-IIB BiCMOS process delivers low power dissipation while maintaining high-speed performance.
It supports simultaneous 3-state output control per direction, with ground-bounce (VOLP) <1 V and ESD protection exceeding 2000 V (MIL-STD-883) and 200 V (machine model). Input thresholds are TTL-compatible (VIH = 2 V, VIL = 0.8 V), and it requires no external pull-ups on OE when powered correctly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL logic rails and stable operation across industrial voltage tolerances. |
| Operating Temperature | –40°C to +85°C - qualified for commercial and industrial environments without derating. |
| 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 transfer up to ~145 MHz clock-equivalent rates. |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - guarantees robust noise margin and interoperability with legacy 5-V CMOS/TTL families. |
| 3-State Leakage | IOZL/IOZH ≤ ±10 µA - minimizes standby current and prevents unintended loading of shared buses during disable. |
| ESD Rating | >2000 V HBM - meets MIL-STD-883 requirements for handling reliability in manufacturing and field service. |
Pinout & Package
TSSOP-24 (PW) package: 0.65 mm pitch, 7.9 mm × 4.5 mm body, 1.2 mm max height, lead-free 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-side latch; driven by upstream source (e.g., microcontroller port). |
| 9–16 | B1–B8 Outputs | 3-state outputs reflecting A-latch contents when CEAB and OEAB are active low. |
| 17, 18 | CEAB, CEBA | Chip-enable controls: CEAB low enables A→B path; CEBA low enables B→A path. |
| 19, 20 | LEAB, LEBA | Latch-enable: low-to-high transition captures data into respective A or B register. |
| 21, 22 | OEAB, OEBA | Output-enable: low activates 3-state outputs for corresponding direction. |
| 23 | GND | Power return reference for all logic and I/O circuits. |
| 24 | VCC | +5 V supply input; decoupling capacitor required within 1 cm for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 8-bit latches | Enables concurrent A↔B data buffering with separate timing control-eliminates need for external flip-flops in bus arbitration logic. |
| High-drive 3-state outputs | –32 mA sink/source capability drives ≥10 standard TTL loads directly, reducing board space and component count. |
| Low ground bounce (VOLP < 1 V) | Mitigates signal integrity issues during simultaneous output switching-critical for clean bus transitions in dense PCB layouts. |
| EPIC-IIB BiCMOS process | Combines bipolar speed and CMOS low static power-delivers 6.9 ns propagation delay with ICC < 30 mA at full load. |
| TTL-compatible input thresholds | VIH = 2.0 V / VIL = 0.8 V ensures seamless integration with legacy 5-V microcontrollers, FPGAs, and peripheral ICs. |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module Bus Isolation |
|---|---|
Use Scenario: Interfacing a 32-bit MCU data bus to multiple 8-bit sensor/actuator modules via shared backplane wiring. IC Role / Device Role / Timing Role: Bidirectional registered transceiver providing direction-controlled, glitch-free data handoff between CPU and peripheral slots. Use Value: Eliminates bus contention using 3-state control and stores data synchronously via LEAB/LEBA-enabling deterministic read/write cycles without external clock domain synchronization. | Use Scenario: Isolating CAN controller I/O from microcontroller GPIO banks while supporting diagnostic data mirroring. IC Role / Device Role / Timing Role: Registered buffer that latches and forwards status signals (e.g., door lock state, light feedback) with controlled enable timing. Use Value: Prevents transient glitches during power-up/down sequences via OE tie-high design guidance-ensuring safe high-impedance default state per TI recommendation. |
| Test Equipment Digital Pattern Generator | Legacy System Memory Expansion Adapter |
Use Scenario: Generating synchronized 8-bit stimulus patterns to DUTs under automated test, with real-time direction reversal for response capture. IC Role / Device Role / Timing Role: Direction-reversible latch acting as pattern register and response sampler-controlled by FPGA-generated CE/LE/OE strobes. Use Value: Sub-7 ns propagation delay and 0.5 ns hold time support tight timing margins in 100+ MHz test vectors-verified at VCC = 5 V, TA = 25°C. | Use Scenario: Adding external SRAM or EPROM to an older 8-bit microprocessor system with limited address/data bus drive capability. IC Role / Device Role / Timing Role: Bus driver and direction controller managing data flow between CPU AD-bus and memory device data pins. Use Value: 64 mA IOL drives long traces and multiple memory devices simultaneously-replacing discrete transistor arrays with single-chip solution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT245APWR | Non-latched, flow-through 8-bit transceiver; lacks internal D-latches and LE inputs. | Suitable only for simple direction-controlled pass-through-not for data sampling or pipeline staging. | Select SN74ABT245APWR when synchronous latching is unnecessary and minimal propagation delay (<5 ns) is prioritized. |
| SN74LVTH16245ADGGR | 16-bit, 3.3-V-only, LVTH logic family; higher drive (–32/+64 mA), but incompatible with 5-V systems without level shifting. | Designed for modern low-voltage embedded systems-not drop-in for legacy 5-V designs. | Choose SN74LVTH16245ADGGR only if migrating to 3.3-V architecture and requiring wider bus width. |
Compared with SN74ABT245APWR and SN74LVTH16245ADGGR, the SN74ABT543APWR uniquely provides dual-path registered storage in a 5-V environment-making it irreplaceable where intermediate data capture, bus turnaround timing control, or 5-V legacy compatibility are mandatory.
Availability
SN74ABT543APWR is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, automated test equipment, and legacy microprocessor memory expansion requiring stable component supply and long-term manufacturability.
Supply support for SN74ABT543APWR 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 bus technologies.
The ABT logic family-including SN74ABT543APWR-is engineered for high-speed, low-noise 5-V TTL-compatible bus interfacing in industrial, computing, and communications infrastructure.
FAQ
What is the maximum operating frequency supported by the SN74ABT543APWR?
The SN74ABT543APWR does not specify a maximum clock frequency, but its propagation delay (tPLH/tPHL ≤ 6.9 ns at CL = 50 pF) supports reliable data transfer at effective bus rates up to ~145 MHz. Actual usable frequency depends on system-level timing margins, trace capacitance, and load conditions-designers should verify setup/hold times (e.g., tsu = 3.5 ns, th = 0.5 ns) in their specific layout.
How should the OE pins be handled during power-up to ensure high-impedance state on SN74ABT543APWR?
To guarantee high-impedance outputs during power-up or power-down, OEAB and OEBA must be tied to VCC through pull-up resistors. TI specifies the minimum resistor value based on the driver's current-sinking capability-typically 4.7 kΩ to 10 kΩ suffices for most 5-V systems. This prevents bus contention before firmware initializes control signals.
Does SN74ABT543APWR support mixed-voltage operation (e.g., 3.3-V inputs with 5-V VCC)?
No. The SN74ABT543APWR is a 5-V-only device: VIH = 2.0 V and VIL = 0.8 V are specified relative to VCC = 4.5–5.5 V. Applying 3.3-V logic levels risks marginal recognition of high inputs and violates recommended operating conditions. For mixed-voltage systems, level-shifting circuitry or a 3.3-V-compatible transceiver like SN74LVC245A is required.
What is the thermal resistance (θJA) of the SN74ABT543APWR in its TSSOP-24 package?
The SN74ABT543APWR in the PW (TSSOP-24) package has a junction-to-ambient thermal resistance (θJA) of 120°C/W, as specified in the absolute maximum ratings table. This value assumes standard JEDEC 2-layer board conditions; actual thermal performance improves with copper pour, thermal vias, or airflow-and degrades in compact, multi-layer, or enclosed assemblies.
Can SN74ABT543APWR be used in place of SN74ABT543ADBR or SN74ABT543ADWR?
Yes-SN74ABT543APWR is functionally identical to SN74ABT543ADBR (SSOP-24) and SN74ABT543ADWR (SOIC-24), differing only in package type (TSSOP vs. SSOP vs. SOIC), pin pitch, and thermal characteristics. All share identical logic, timing, DC specs, and pinout. PCB layout must match the 0.65 mm pitch and 7.9 mm × 4.5 mm footprint of the PW package-not interchangeable without board revision.
SN74ABT543APWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 24-TSSOP (0.173", 4.40mm 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-TSSOP
SN74ABT543APWR FAQ
1.How can I place an order for SN74ABT543APWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT543APWR 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 SN74ABT543APWR reliable?
The price and inventory of SN74ABT543APWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT543APWR is usually 5 days.
3.What payment methods are accepted for SN74ABT543APWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT543APWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT543APWR?
SN74ABT543APWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT543APWR 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 SN74ABT543APWR?
For technical support, including SN74ABT543APWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT543APWR requirements.
6.How does Aetrix verify that SN74ABT543APWR is sourced from the original manufacturer or authorized distributors?
All SN74ABT543APWR 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 SN74ABT543APWR meets industry standards.
7.What is the process for return or replacement of SN74ABT543APWR?
All SN74ABT543APWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT543APWR, 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 SN74ABT543APWR part is unused and in its original packaging.
Return procedure for SN74ABT543APWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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