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Texas Instruments SN74ABT543ADWR
- Part No.:
- SN74ABT543ADWR
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABT543ADWR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,400
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Product details
Overview
SN74ABT543ADWR 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 latch-enable (LEAB/LEBA) and output-enable (OEAB/OEBA) inputs, 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 computing systems.
For engineers reviewing the SN74ABT543ADWR datasheet, SN74ABT543ADWR pinout, SN74ABT543ADWR application, or SN74ABT543ADWR equivalent, key selection criteria include its 24-pin SOIC (DW) package, 3.5 ns minimum LE pulse width, 0.5 ns hold time at 5 V, and compatibility with TTL-level signaling in buffered bus architectures.
Technical Context
The SN74ABT543ADWR implements two independent 8-bit D-type latch sets-one for A-to-B and one for B-to-A data flow-each controlled by dedicated CE, LE, and OE signals. Its EPIC-IIB BiCMOS process enables low power dissipation while maintaining high-speed switching (tPLH/tPHL ≤ 6.9 ns at CL = 50 pF).
It supports true 3-state output control with separate OEAB and OEBA pins, and includes input clamp protection (±18 mA IIK), ground bounce mitigation (VOLP < 1 V), and ESD robustness (>2000 V HBM). Power-up/down high-impedance safety requires OE tied to VCC via pullup resistor.
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 ambient environments. |
| Output Drive | –32 mA IOH / +64 mA IOL - drives heavy capacitive loads and multiple TTL inputs directly. |
| Propagation Delay | tPLH/tPHL ≤ 6.9 ns (CL = 50 pF) - supports high-speed bus transfer up to ~100 MHz in short traces. |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - fully compatible with TTL logic families and mixed-voltage interfacing. |
| 3-State Enable Time | tPZH/tPLZ ≤ 8.4 ns - enables fast bus arbitration and dynamic direction switching. |
| Package | SOIC-24 (DW) - industry-standard surface-mount footprint with 1.27 mm pitch, RoHS-compliant NIPDAU finish. |
Pinout & Package
SN74ABT543ADWR uses a 24-pin SOIC (DW) package per JEDEC MS-013, 7.5 mm body width, 2.35 mm height max, with gull-wing leads and pin 1 index area marked.
| 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 latching; driven by upstream source (e.g., CPU data bus). |
| 13, 14, 15, 16, 17, 18, 19, 20 | B1–B8 Outputs/Inputs | Bidirectional 8-bit bus terminals; function as outputs when CEAB/OEAB active, inputs when CEBA/OEBA active. |
| 9, 23 | LEAB, LEBA | Latch-enable controls transparency/storage mode of respective A→B or B→A latches on rising edge. |
| 11, 22 | OEAB, OEBA | 3-state output enables - low activates B-side or A-side drivers; high forces high-impedance state. |
| 10, 24 | CEAB, CEBA | Chip-enable gates data flow direction - low permits A→B or B→A transfer; high disables both paths. |
| 12 | GND | Power ground reference for all internal logic and output drivers. |
| 21 | VCC | +5 V supply rail - powers BiCMOS core and output stages; decoupling required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| EPIC-IIB BiCMOS Process | Reduces static power vs. bipolar while retaining high drive strength and speed - critical for dense backplane interfaces. |
| Independent Direction Control | Separate CE/LE/OE for A↔B paths allows simultaneous or staggered bidirectional transfers without bus contention. |
| High-Drive 3-State Outputs | –32 mA / +64 mA drive capability eliminates need for external bus buffers in most 5-V systems. |
| Robust ESD & Clamping | 2000 V HBM ESD rating and ±18 mA input clamp current protect against handling and system-level transients. |
| Power-Up Safety | OE pins default to high-impedance when floating; recommended pullup ensures safe startup before controller initialization. |
Applications
| Industrial Backplane Interface | Legacy CPU Data Bus Extension |
|---|---|
Use Scenario: Interfacing a microcontroller's 8-bit data bus to a modular I/O expansion backplane with shared address/data lines. IC Role / Device Role / Timing Role: Bidirectional registered transceiver providing latch-synchronized data handoff between master and peripheral slots. Use Value: Eliminates timing skew across 8-bit paths using synchronous LE control, enabling reliable 20+ MHz bus operation without external clock domain alignment. | Use Scenario: Extending the data path of an 80C88 or Z80-based embedded controller to off-board memory or peripheral ASICs. IC Role / Device Role / Timing Role: Registered bus transceiver buffering and isolating CPU data lines during DMA or interrupt-driven transfers. Use Value: High-current drive (64 mA IOL) sustains signal integrity across 15 cm PCB traces loaded with 10+ TTL inputs, reducing bit errors in noisy factory environments. |
| Test Equipment Digital I/O Module | Programmable Logic Controller (PLC) I/O Coupling |
Use Scenario: Configurable digital pattern generator/analyzer card requiring bidirectional, latch-controlled data exchange with DUT. IC Role / Device Role / Timing Role: Octal registered transceiver managing synchronized test vector loading and response capture under FPGA control. Use Value: Independent LEAB/LEBA and OEAB/OEBA enable precise setup/hold timing (≤3.5 ns) for deterministic test cycle alignment at 50 MHz. | Use Scenario: Isolating field I/O modules (e.g., 24 V digital inputs) from a 5 V PLC CPU bus while supporting hot-swap and fault detection. IC Role / Device Role / Timing Role: Level-tolerant bus interface with 3-state isolation, allowing CPU to read/write I/O registers without affecting field-side logic. Use Value: Input clamp protection (±18 mA) and 2000 V HBM ESD withstand prevent damage from induced surges on long industrial wiring runs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT245DWR | Non-latched, 8-bit non-inverting transceiver; no internal register stage; lower propagation delay (≤5.5 ns) but no data hold capability. | Suitable for simple bus driving where data synchronization is handled externally (e.g., by FPGA logic), not for latch-based handshaking protocols. | Select SN74ABT245DWR only if latch functionality is unnecessary and minimal delay is prioritized over data staging. |
| SN74LVC245APW | 3.3 V-only operation (1.65–3.6 V), lower drive (–24/+24 mA), smaller TSSOP-24 package; lacks BiCMOS speed/power balance. | Targeted for modern low-voltage systems; incompatible with 5 V buses unless level-shifted; unsuitable for legacy 5 V industrial designs. | Choose SN74LVC245APW only for new 3.3 V designs requiring space savings and lower power, not as drop-in replacement for SN74ABT543ADWR. |
Compared with SN74ABT245DWR and SN74LVC245APW, the SN74ABT543ADWR uniquely provides registered data staging, 5 V tolerance, and high-current drive in a single SOIC-24 package - making it irreplaceable in legacy bus arbitration and synchronous handshaking applications where latch control is mandatory.
Availability
SN74ABT543ADWR is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy CPU bus extensions, and programmable logic controller I/O coupling requiring stable component supply and long-term obsolescence management.
Supply support for SN74ABT543ADWR 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 for industrial, automotive, and communications markets.
The SN74ABT543ADWR belongs to TI's ABT logic family - engineered for high-speed, high-drive 5-V bus interfacing with latch synchronization, targeting industrial control, test equipment, and legacy computing infrastructure.
FAQ
What is the maximum operating temperature range for the SN74ABT543ADWR?
The SN74ABT543ADWR is characterized for operation from –40°C to +85°C. This commercial-industrial temperature range is validated per TI's recommended operating conditions and applies specifically to the DW-package variant. Operation outside this range may result in parametric degradation or functional failure, and is not guaranteed by TI's production testing.
Does the SN74ABT543ADWR support true bidirectional data flow without external logic?
Yes, the SN74ABT543ADWR supports independent bidirectional data flow using dedicated control pins: CEAB/LEAB/OEAB for A→B transfer and CEBA/LEBA/OEBA for B→A transfer. No external logic is needed to manage direction - each path operates autonomously, enabling simultaneous or time-multiplexed bus arbitration in systems like modular backplanes.
What is the recommended power-up sequence for reliable 3-state behavior of the SN74ABT543ADWR?
To ensure high-impedance outputs during power-up, OEAB and OEBA must be held high until the controlling logic is initialized. TI recommends tying both OE pins to VCC through a pullup resistor (value determined by driver sink capability, typically 4.7 kΩ–10 kΩ). This prevents bus contention before firmware configures the transceiver's direction and latch states.
Can the SN74ABT543ADWR drive standard TTL loads directly?
Yes, the SN74ABT543ADWR can drive standard TTL loads directly: its IOL = +64 mA and IOH = –32 mA exceed the TTL fanout requirement of –1.6 mA (IOH) and +16 mA (IOL) per input. At VCC = 5 V, it supports up to 4 standard TTL inputs per output without external buffering, verified across the full operating temperature range.
Is the SN74ABT543ADWR pin-compatible with other packages in the ABT543A family?
Yes, the SN74ABT543ADWR (SOIC-24, DW) shares identical pinout and logic function with SN74ABT543ADBR (SSOP-24, DB) and SN74ABT543APWR (TSSOP-24, PW), as confirmed by TI's SCBS157F datasheet and package addendum. All three use the same top-view pin numbering, signal assignment, and electrical interface - enabling direct PCB footprint substitution where thermal and mechanical constraints allow.
SN74ABT543ADWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 24-SOIC (0.295", 7.50mm 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-SOIC
SN74ABT543ADWR FAQ
1.How can I place an order for SN74ABT543ADWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT543ADWR 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 SN74ABT543ADWR reliable?
The price and inventory of SN74ABT543ADWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT543ADWR is usually 5 days.
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SN74ABT543ADWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT543ADWR 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 SN74ABT543ADWR?
For technical support, including SN74ABT543ADWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT543ADWR requirements.
6.How does Aetrix verify that SN74ABT543ADWR is sourced from the original manufacturer or authorized distributors?
All SN74ABT543ADWR 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 SN74ABT543ADWR meets industry standards.
7.What is the process for return or replacement of SN74ABT543ADWR?
All SN74ABT543ADWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT543ADWR, 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 SN74ABT543ADWR part is unused and in its original packaging.
Return procedure for SN74ABT543ADWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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