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Texas Instruments SN74ABT543ANT
- Part No.:
- SN74ABT543ANT
- Manufacturer:
- Texas Instruments
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74ABT543ANT.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,033
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Product details
Overview
SN74ABT543ANT 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 backplanes and legacy computing systems.
For engineers reviewing the SN74ABT543ANT datasheet, SN74ABT543ANT pinout, SN74ABT543ANT application, or SN74ABT543ANT equivalent, key selection criteria include its dual-direction latched transceivers, 3-state output isolation, BiCMOS power efficiency, and compatibility with 5-V TTL-level signaling environments.
Technical Context
The SN74ABT543ANT 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 controls. Its EPIC-IIB BiCMOS process enables low power dissipation while maintaining TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) and robust drive strength.
It supports simultaneous bidirectional operation only when direction controls are sequenced correctly: CEAB must be low to enable A-to-B path, CEBA low for B-to-A path; LEAB/LEBA transitions capture data into respective latches, and OEAB/OEBA govern 3-state output drivers. Output ground bounce (VOLP) is specified <1 V at 5 V/25°C.
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 - sufficient to drive multiple TTL loads or terminate stubs on parallel buses. |
| Propagation Delay | tPLH/tPHL ≤ 6.9 ns (CL = 50 pF) - supports high-speed bus handshaking up to ~100 MHz system timing margins. |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - matches standard TTL logic levels for seamless integration with legacy controllers. |
| ESD Protection | >2000 V HBM, >200 V MM - exceeds MIL-STD-883 requirements for handling robustness in manufacturing and field service. |
| Power Dissipation | ICC ≤ 34 mA max (all outputs active) - optimized via BiCMOS for lower static current vs. bipolar-only equivalents. |
Pinout & Package
SN74ABT543ANT uses a 24-pin plastic DIP (NT) package with 0.6-inch width and through-hole mounting. Pin 1 is located at top-left corner with notch or dot marking; pin numbering proceeds counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (LEBA) | B-to-A latch enable | Active-low edge-triggered control: low-to-high transition captures B-bus data into B-to-A register. |
| 2 (OEBA) | B-to-A output enable | Active-low: asserts 3-state B outputs when low; high-impedance when high. |
| 3–10 (A1–A8) | A-bus data inputs/outputs | Bi-directional I/O ports connected to A-side bus; driven by A-latches when OEAB low. |
| 11 (CEAB) | A-to-B chip enable | Active-low master enable: must be low to allow A-to-B data flow or B-output activation. |
| 12 (GND) | Ground reference | Primary return path for all logic and output currents; requires low-impedance PCB connection. |
| 13 (VCC) | Power supply | +5 V supply rail; bypassing with 0.1 µF ceramic capacitor near pin recommended. |
| 14 (CEBA) | B-to-A chip enable | Active-low master enable for reverse path; decouples A/B direction control for asynchronous operation. |
| 15–22 (B1–B8) | B-bus data inputs/outputs | Bi-directional I/O ports connected to B-side bus; driven by B-latches when OEBA low. |
| 23 (LEAB) | A-to-B latch enable | Active-low edge-triggered control: low-to-high transition captures A-bus data into A-to-B register. |
| 24 (OEAB) | A-to-B output enable | Active-low: asserts 3-state A outputs when low; high-impedance when high. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 8-bit latched transceivers | Enables concurrent A↔B data staging with separate clocking and output gating per direction. |
| High-current 3-state outputs | –32 mA source / +64 mA sink capability drives heavy capacitive loads or multiple TTL inputs without buffers. |
| EPIC-IIB BiCMOS process | Reduces quiescent power vs. bipolar equivalents while preserving speed and noise immunity. |
| Low output ground bounce | VOLP < 1 V at 5 V/25°C ensures signal integrity during simultaneous output switching on shared ground planes. |
| Robust ESD protection | Exceeds 2000 V HBM and 200 V machine model - reduces handling damage risk in assembly and test. |
Applications
| Industrial Backplane Interface | Legacy CPU Bus Extension |
|---|---|
Use Scenario: Isolating and extending parallel address/data buses between CPU modules and peripheral cards in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional registered transceiver providing controlled data staging and 3-state isolation between mismatched bus timing domains. Use Value: Prevents bus contention during hot-swap or partial reconfiguration; latch enables allow synchronous sampling of burst transfers. | Use Scenario: Interfacing Z80 or 8086-based microprocessor subsystems with external memory or I/O expansion cards using shared 8-bit data lanes. IC Role / Device Role / Timing Role: Octal registered transceiver managing direction-controlled data flow with independent enable sequencing for read/write cycles. Use Value: Eliminates need for discrete bus buffers and flip-flops; integrated latching simplifies timing-critical control logic. |
| Test Equipment Data Acquisition | Automated Manufacturing Fixture |
Use Scenario: Capturing parallel sensor outputs (e.g., 8-channel ADC results) and forwarding them to a host controller via a multiplexed diagnostic bus. IC Role / Device Role / Timing Role: Latched transceiver acting as synchronized data capture buffer with 3-state output disable for bus sharing among multiple instruments. Use Value: Ensures glitch-free sampling window alignment and prevents signal corruption during bus arbitration. | Use Scenario: Controlling and monitoring 8-bit status signals (e.g., solenoid states, limit switches) in electro-mechanical assembly stations. IC Role / Device Role / Timing Role: Registered transceiver serving as isolated I/O expander with latch hold capability for stable fixture state retention. Use Value: Maintains deterministic I/O state across power glitches or controller reset sequences without external storage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT245N | Non-latched octal transceiver; no internal registers; relies on external clocking for data capture. | Suitable for simple bus driving where latching is handled upstream; lacks built-in storage for asynchronous handshaking. | Select when system already provides edge-triggered capture logic and lower propagation delay (<5.5 ns) is prioritized over latch functionality. |
| SN74ACT543N | Same pinout and function but ACT-family CMOS; lower drive (–24 mA IOH, +24 mA IOL); higher noise margin (VIH = 2.0 V, VIL = 0.8 V). | Better for mixed-voltage systems requiring 5-V tolerant inputs with reduced power; unsuitable for driving heavy TTL loads. | Select when interfacing with CMOS-dominated subsystems and power efficiency outweighs drive strength requirements. |
Compared with SN74ABT245N and SN74ACT543N, the SN74ABT543ANT uniquely integrates dual-direction latching within a single 24-pin DIP, enabling autonomous bidirectional data staging without external flip-flops-critical for space-constrained industrial control boards where board real estate and component count directly impact reliability and cost.
Availability
SN74ABT543ANT is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy CPU bus extensions, test equipment data acquisition, and automated manufacturing fixtures requiring stable component supply and long-term obsolescence management.
Supply support for SN74ABT543ANT 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 ABT logic family-including SN74ABT543ANT-is engineered for high-speed, low-power 5-V TTL-compatible bus interface applications, emphasizing drive strength, noise immunity, and latch-controlled data staging in legacy and upgrade systems.
FAQ
What is the maximum operating temperature range for the SN74ABT543ANT?
The SN74ABT543ANT is characterized for operation from –40°C to +85°C. This commercial-industrial temperature range supports deployment in enclosed control cabinets, factory-floor equipment, and non-automotive embedded systems where ambient thermal conditions remain within these limits. The device does not meet extended military-grade specifications like the SN54ABT543A (–55°C to 125°C).
Can the SN74ABT543ANT be used in place of the SN74ABT543ADW?
Yes, the SN74ABT543ANT and SN74ABT543ADW share identical logic functionality, timing parameters, and electrical specifications. The primary difference is packaging: NT is a 24-pin plastic DIP (through-hole), while DW is a 24-pin SOIC (surface-mount). PCB layout, soldering process, and mechanical mounting differ, but no redesign of logic or timing is required when substituting one for the other in compatible footprints.
How does the latch-enable (LE) functionality work on the SN74ABT543ANT?
The SN74ABT543ANT uses two independent latch-enable inputs: LEAB controls the A-to-B register, and LEBA controls the B-to-A register. When LEAB is low, the A-to-B latches are transparent; a low-to-high transition stores the current A-bus data. Similarly, LEBA low enables transparency on the B side. Both latches retain data until their respective LE signal toggles again-providing synchronous staging without external clocks.
What is the recommended power-up sequence to ensure high-impedance outputs on the SN74ABT543ANT?
To guarantee 3-state outputs during power-up or power-down, OEAB and OEBA must be held high (inactive) until VCC stabilizes. TI recommends tying both OE pins to VCC via pullup resistors; minimum resistance is determined by the driver's current-sinking capability. For typical use, a 4.7-kΩ resistor suffices. Failure to do so may cause output contention or bus conflicts during supply ramp.
Does the SN74ABT543ANT support hot-swapping or live insertion into a powered backplane?
No, the SN74ABT543ANT is not hot-swap rated. Its absolute maximum ratings specify no guaranteed operation with VCC applied before inputs, and Ioff leakage (±100 µA at VCC = 0) is insufficient to prevent disturbance on live buses. For hot-swap applications, dedicated hot-swap controllers or buffers with power-on reset and Ioff-enhanced design (e.g., SN74AVC series) are required instead of the SN74ABT543ANT.
SN74ABT543ANT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- Through Hole
- Supplier Device Package:
- 24-PDIP
SN74ABT543ANT FAQ
1.How can I place an order for SN74ABT543ANT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT543ANT 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 SN74ABT543ANT reliable?
The price and inventory of SN74ABT543ANT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT543ANT is usually 5 days.
3.What payment methods are accepted for SN74ABT543ANT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT543ANT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT543ANT?
SN74ABT543ANT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT543ANT 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 SN74ABT543ANT?
For technical support, including SN74ABT543ANT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT543ANT requirements.
6.How does Aetrix verify that SN74ABT543ANT is sourced from the original manufacturer or authorized distributors?
All SN74ABT543ANT 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 SN74ABT543ANT meets industry standards.
7.What is the process for return or replacement of SN74ABT543ANT?
All SN74ABT543ANT units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT543ANT, 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 SN74ABT543ANT part is unused and in its original packaging.
Return procedure for SN74ABT543ANT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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