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NXP Semiconductors 74ABT543ADB,112
- Part No.:
- 74ABT543ADB,112
- Manufacturer:
- NXP Semiconductors
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74ABT543ADB,112.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,218
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Product details
Overview
74ABT543ADB,112 from Nexperia is an octal latched transceiver with dual-directional D-type latch registers, 3-state outputs, and independent A-to-B and B-to-A control (LEAB/OEAB/EAB and LEBA/OEBA/EBA). It operates from 4.5 V to 5.5 V, delivers ±64 mA output drive, and supports −40 °C to +85 °C industrial temperature range. It enables bidirectional data buffering in bus isolation and register staging applications.
For engineers reviewing the 74ABT543ADB,112 datasheet, 74ABT543ADB,112 pinout, 74ABT543ADB,112 application, or 74ABT543ADB,112 equivalent, this device serves as a high-speed, latch-enabled bidirectional interface for microcontroller buses, memory expansion, and FPGA I/O bridging where independent direction control and live insertion capability are required.
Technical Context
The 74ABT543ADB,112 integrates two independent 8-bit D-type latch banks - one for A-to-B flow and one for B-to-A flow - each with dedicated latch enable (LE), output enable (OE), and path enable (E) inputs. Its BiCMOS architecture delivers low propagation delay (tPLH/tPHL ≤ 5.2 ns at 5 V) while maintaining high noise immunity and robust 3-state behavior during power-up.
Each direction supports transparent mode (when E and OE are LOW and LE is HIGH), latched mode (on LE LOW-to-HIGH transition), and high-impedance disable (when OE is HIGH). The device features power-up 3-state and latch-up protection exceeding 500 mA per JESD78B Class II Level A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL/ABT logic systems and stable operation across industrial voltage tolerances. |
| Output Drive | −64 mA / +32 mA - supports direct driving of heavy capacitive loads or multiple TTL inputs without external buffers. |
| Propagation Delay | ≤ 5.2 ns (A↔B path) - enables reliable operation in high-speed bus timing budgets up to ~100 MHz clock-equivalent systems. |
| Operating Temperature | −40 °C to +85 °C - qualified for industrial-grade embedded control, instrumentation, and communications equipment. |
| ESD Protection | HBM > 2000 V, MM > 200 V - provides robust handling during board assembly and field service without additional protection circuitry. |
| Input Leakage | ±100 µA max (−40 °C to +85 °C) - minimizes unintended current paths in high-impedance or battery-sensitive designs. |
| Power-Up State | 3-state outputs - prevents bus contention during system reset or cold start sequences. |
Pinout & Package
74ABT543ADB,112 uses the SSOP24 package (SOT340-1), a plastic shrink small outline package with 24 leads and 5.3 mm body width, optimized for high-density PCB layouts while maintaining hand-solderability and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (LEBA) | B-to-A latch enable input | Active-LOW signal that captures B-bus data into B-to-A latches on LOW-to-HIGH transition; enables synchronous staging of inbound data. |
| 2 (OEBA) | B-to-A output enable input | Active-LOW control for enabling/disabling B-to-A output drivers; used with LEBA to manage data release timing onto A bus. |
| 3–10 (A0–A7) | A-side I/O terminals | Bidirectional data lines for A bus; function as inputs when B-to-A path is active, outputs when A-to-B path is active. |
| 11 (EAB) | A-to-B enable input | Active-LOW path gate for A-to-B data flow; must be LOW for any A-to-B transfer, including transparent or latched modes. |
| 12 (GND) | Ground reference | Primary 0 V return for all internal logic and output stages; requires low-inductance connection to minimize ground bounce. |
| 13 (OEAB) | A-to-B output enable input | Active-LOW control for A-to-B output drivers; decouples output timing from latch timing for flexible bus arbitration. |
| 14 (LEAB) | A-to-B latch enable input | Active-LOW signal that latches A-bus data into A-to-B registers on LOW-to-HIGH edge; enables precise capture of transient signals. |
| 15–22 (B0–B7) | B-side I/O terminals | Bidirectional data lines for B bus; mirror A0–A7 functionality for reverse-direction data transfer. |
| 23 (EBA) | B-to-A enable input | Active-LOW path gate for B-to-A data flow; required LOW for all B-to-A operations, including transparent or latched modes. |
| 24 (VCC) | Positive supply | +5 V nominal supply; must be decoupled locally with ≥100 nF ceramic capacitor to suppress switching noise and ensure timing stability. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent latch banks | Enables concurrent A→B and B→A data staging without cross-talk, supporting full-duplex bus arbitration in real-time systems. |
| Separate LE/OE/E controls per direction | Allows fine-grained timing control - e.g., pre-latch data on one side while holding output on the other - critical for glitch-free bus handshaking. |
| Live insertion/extraction support | Permits hot-plug replacement in backplane or modular systems without disrupting adjacent logic or causing bus glitches. |
| Power-up 3-state and reset | Guarantees outputs remain high-impedance until VCC stabilizes, eliminating risk of bus contention during power sequencing. |
| BiCMOS process | Combines bipolar speed and CMOS low static power: ICC < 250 µA in standby, yet tPLH < 5 ns - ideal for power-constrained high-performance interfaces. |
Applications
| Microcontroller Bus Expansion | FPGA I/O Bridging |
|---|---|
|
Use Scenario: Expanding limited GPIO count of an ARM Cortex-M4 MCU to drive multiple peripheral modules via shared 8-bit data bus. IC Role / Device Role: Bidirectional latch-controlled buffer isolating MCU core from peripheral timing variations and capacitance loading. Use Value: Enables deterministic read/write cycles using LEAB/OEAB for A-to-peripheral transfers and LEBA/OEBA for status reads back to MCU - no software wait states needed. |
Use Scenario: Interfacing a Xilinx Artix-7 FPGA's bank-specific I/O voltages (3.3 V) with legacy 5 V TTL peripherals in test equipment. IC Role / Device Role: Level-shifting transceiver with direction control, leveraging its 5 V tolerant inputs and 5 V output drive capability. Use Value: Eliminates need for discrete level shifters; supports simultaneous 5 V peripheral writes and 3.3 V status reads via independent A/B control paths. |
| Industrial Backplane Interface | Memory-Mapped I/O Staging |
|
Use Scenario: Isolating CPU module from I/O carrier card in a modular PLC chassis with hot-swap capability. IC Role / Device Role: Hot-plug-safe bidirectional bus interface with built-in latch storage for command/data staging during card insertion/removal. Use Value: Live insertion support prevents bus lock-up; latched registers hold last valid command during reconfiguration, ensuring continuity of control flow. |
Use Scenario: Buffering address/data between a DSP's EMIF and external SRAM where write latency must be minimized and read coherency ensured. IC Role / Device Role: Synchronous latch transceiver acting as write-data pipeline and read-data synchronizer between asynchronous domains. Use Value: LEAB captures DSP write data on rising edge; OEAB releases it to SRAM only after address setup - eliminates timing race conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal latched transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVT543PW,118 | Lower supply range (2.7–3.6 V), 3.3 V only; 32 mA drive; faster tPLH (3.5 ns typ) but narrower voltage margin. | Suitable for 3.3 V-only systems; not interoperable with 5 V buses or legacy TTL peripherals. | Select when operating exclusively in 3.3 V domains with tighter timing budgets and lower power constraints. |
| SN74ABT543N | Same ABT family specs, but in PDIP-24 (through-hole); identical electrical characteristics and pinout except for package mechanicals. | Used in prototyping, legacy repair, or through-hole manufacturing; lacks SSOP's density and thermal performance. | Choose for breadboard validation, field repair of older boards, or where automated SSOP placement is unavailable. |
Compared with 74ABT543ADB,112, the 74LVT543PW,118 trades 5 V compatibility and drive strength for lower voltage operation and marginal speed gain, while SN74ABT543N offers identical logic functionality in a through-hole form factor - making the 74ABT543ADB,112 optimal for space-constrained, mixed-voltage industrial PCBs requiring robust 5 V interfacing.
Availability
74ABT543ADB,112 is available at Aetrix Electronics and suitable for industrial control systems, FPGA carrier boards, and modular instrumentation requiring stable component supply, long-term lifecycle assurance, and guaranteed SSOP24 sourcing.
Supply support for 74ABT543ADB,112 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
Nexperia is a global leader in high-performance discrete, logic, and PowerMOS semiconductors, serving automotive, industrial, computing, and consumer markets with rigorously tested, application-optimized components.
The 74ABT543ADB,112 belongs to Nexperia's ABT logic family - engineered for high-speed, low-noise bidirectional bus interfacing in industrial and communications infrastructure where reliability under wide temperature and voltage ranges is essential.
FAQ
What is the maximum clock-equivalent frequency supported by the 74ABT543ADB,112?
The 74ABT543ADB,112 does not operate on a clock signal but functions as a latch-based transceiver. Its 5.2 ns maximum propagation delay (tPLH/tPHL) supports reliable data transfer in systems with bus cycle times ≥10 ns - effectively enabling operation in 100 MHz-equivalent synchronous interfaces when combined with appropriate controller timing margins.
Does the 74ABT543ADB,112 support 3.3 V logic levels on its inputs?
Yes - the 74ABT543ADB,112 has TTL-compatible inputs with VIH(min) = 2.0 V and VIL(max) = 0.8 V, allowing direct interfacing with 3.3 V CMOS and LVTTL outputs without level-shifting, provided VCC remains at 4.5–5.5 V for full output drive compliance.
How does the power-up 3-state behavior of the 74ABT543ADB,112 prevent bus contention?
During power-up, the 74ABT543ADB,112 holds all outputs in high-impedance state regardless of OEAB/OEBA pin states until VCC reaches a valid operating threshold. This guarantees no driver activation before system reset completes, eliminating risk of short-circuits or data corruption on shared buses.
Can the 74ABT543ADB,112 be used for unidirectional data transfer only?
Yes - the 74ABT543ADB,112 supports unidirectional use by tying either OEAB/EAB/LEAB or OEBA/EBA/LEBA to fixed inactive states (e.g., OEAB = HIGH to disable A-to-B outputs), while fully utilizing the remaining direction's latching and buffering capabilities for dedicated path applications.
Is the 74ABT543ADB,112 pin-compatible with other packages in the same family?
Yes - the 74ABT543ADB,112 (SSOP24/SOT340-1), 74ABT543AD (SO24/SOT137-1), and 74ABT543APW (TSSOP24/SOT355-1) share identical pin numbering, signal mapping, and electrical specifications; only mechanical package dimensions and thermal characteristics differ.
74ABT543ADB,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74ABT
- Package/Case:
- 24-SSOP (0.209", 5.30mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
74ABT543ADB,112 FAQ
1.How can I place an order for 74ABT543ADB,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ABT543ADB,112 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 74ABT543ADB,112 reliable?
The price and inventory of 74ABT543ADB,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT543ADB,112 is usually 5 days.
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4.How is shipping managed for 74ABT543ADB,112?
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Once your 74ABT543ADB,112 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 74ABT543ADB,112?
For technical support, including 74ABT543ADB,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT543ADB,112 requirements.
6.How does Aetrix verify that 74ABT543ADB,112 is sourced from the original manufacturer or authorized distributors?
All 74ABT543ADB,112 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 74ABT543ADB,112 meets industry standards.
7.What is the process for return or replacement of 74ABT543ADB,112?
All 74ABT543ADB,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT543ADB,112, 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 74ABT543ADB,112 part is unused and in its original packaging.
Return procedure for 74ABT543ADB,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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