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NXP Semiconductors 74ABT543APW,112
- Part No.:
- 74ABT543APW,112
- Manufacturer:
- NXP Semiconductors
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74ABT543APW,112.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,347
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Product details
Overview
74ABT543APW,112 from Nexperia is an octal latched transceiver with dual-directional 3-state control, combining D-type latch and bus transceiver functions in a single TSSOP24 package. It features separate A-to-B and B-to-A latch enable (LEAB/LEBA) and output enable (OEAB/OEBA) inputs, supports ±32 mA HIGH-level and 64 mA LOW-level output drive, and operates across −40 °C to +85 °C for industrial bus interface applications.
For engineers reviewing the 74ABT543APW,112 datasheet, 74ABT543APW,112 pinout, 74ABT543APW,112 application, or 74ABT543APW,112 equivalent, this device serves as a high-speed, latch-enabled bidirectional data path for memory address/data buses, microcontroller peripheral expansion, and legacy parallel I/O bridging where independent direction control and live insertion capability are required.
Technical Context
The 74ABT543APW,112 implements two independent 8-bit D-type latch banks - one for A-to-B and one for B-to-A data flow - each with dedicated enable logic. Its BiCMOS architecture delivers sub-5 ns propagation delays (tPLH/tPHL ≤ 5.2 ns at VCC = 5.0 V) while maintaining TTL-compatible input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and robust 3-state OFF-state leakage (IOZ ≤ ±50 µA).
Control behavior follows strict timing constraints: set-up times (tsu(H)/tsu(L)) range from 1.0–3.5 ns, hold times (th(H)/th(L)) span −0.8 to +0.5 ns, and minimum latch enable pulse width (tWL) is 1.0 ns. Power-up 3-state and latch-reset ensure deterministic initialization without external sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS systems; no level-shifting required |
| Output drive | −32 mA (HIGH), +64 mA (LOW) - drives heavy capacitive loads and multiple TTL inputs directly |
| Propagation delay | ≤ 5.2 ns (A↔B), ≤ 6.7 ns (LE→output) - enables >100 MHz bus operation in synchronous designs |
| Input thresholds | VIL ≤ 0.8 V, VIH ≥ 2.0 V - ensures reliable interfacing with 5 V CMOS and TTL logic families |
| Operating temperature | −40 °C to +85 °C - qualified for industrial ambient environments without derating |
| ESD protection | HBM > 2000 V, MM > 200 V - withstands handling and board-level electrostatic events |
| Power-up state | 3-state outputs - prevents bus contention during power ramp-up or reset sequences |
Pinout & Package
TSSOP24 package (SOT355-1): plastic thin shrink small outline, 24 leads, 4.4 mm body width, 0.65 mm pitch - optimized for high-density PCB layouts with thermal and mechanical reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (LEBA) | B-to-A latch enable | Active-LOW control: captures B-bus data into B-to-A latches on rising edge |
| 2 (OEBA) | B-to-A output enable | Active-LOW: enables/disables B-to-A 3-state outputs independently of latching |
| 3–10 (A0–A7) | A-side I/O terminals | Bidirectional data paths; driven by A latches when OEAB = LOW and EAB = LOW |
| 11 (EAB) | A-to-B enable | Active-LOW: enables transparent A-to-B path or allows LEAB to capture data |
| 12 (GND) | Ground reference | Primary return path for all I/O and supply currents; requires low-impedance PCB plane |
| 13 (OEAB) | A-to-B output enable | Active-LOW: controls A-to-B output buffer state without affecting latch contents |
| 14 (LEAB) | A-to-B latch enable | Active-LOW: samples A-bus data into A-to-B latches on rising edge |
| 15–22 (B0–B7) | B-side I/O terminals | Bidirectional data paths; driven by B latches when OEBA = LOW and EBA = LOW |
| 23 (EBA) | B-to-A enable | Active-LOW: enables transparent B-to-A path or allows LEBA to capture data |
| 24 (VCC) | Positive supply | 5 V nominal; decoupling capacitor (100 nF) required within 5 mm of pin for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Dual-direction latched transceiver | Integrates 74ABT245 (transceiver) and 74ABT373 (latch) functionality - reduces component count and routing complexity |
| Independent control per direction | Separate LEAB/OEAB/EAB and LEBA/OEBA/EBA pins allow asymmetric data flow management and partial bus isolation |
| Live insertion/extraction support | Power-up 3-state and controlled output disable prevent bus glitches during hot-swap operations in modular backplanes |
| Latch-up immunity | Exceeds 500 mA per JESD78B Class II Level A - ensures robustness against transient overvoltage and ground bounce |
| Low dynamic power | ICC ≤ 250 µA (outputs HIGH), ≤ 30 mA (outputs LOW) at VCC = 5.5 V - minimizes heat generation in dense logic arrays |
Applications
| Memory Address/Data Bus Interface | Microcontroller Peripheral Expansion |
|---|---|
Use Scenario: Isolating and latching address/data signals between a microcontroller and external SRAM or EPROM. IC Role / Device Role / Timing Role: Acts as a bidirectional, latch-controlled bus interface that synchronizes asynchronous memory access cycles. Use Value: Enables deterministic read/write handshaking with setup/hold timing margins ≥1.0 ns and eliminates bus contention during multi-cycle transfers. |
Use Scenario: Extending GPIO count and driving high-capacitance peripherals (e.g., LCD modules, keypad scanners) from an MCU with limited native I/O. IC Role / Device Role / Timing Role: Provides buffered, direction-controlled I/O expansion with independent latch control per port segment. Use Value: Delivers 64 mA sink capability per output to drive LEDs or relays directly, reducing need for external drivers. |
| Legacy Parallel Printer Interface | Industrial Control Backplane |
Use Scenario: Interfacing modern controllers to Centronics-style parallel printers requiring bidirectional handshake and data latching. IC Role / Device Role / Timing Role: Serves as a compliant IEEE 1284-compliant transceiver with programmable latch timing and 3-state isolation. Use Value: Supports live insertion in field-replaceable printer interface cards and meets 100 ns timing windows for strobe/acknowledge protocols. |
Use Scenario: Managing data exchange between multiple plug-in modules (e.g., analog I/O, digital I/O, communication) on a shared backplane. IC Role / Device Role / Timing Role: Functions as a hot-swappable, direction-gated bus repeater with independent enable per slot. Use Value: Prevents bus lockup during module replacement via power-up 3-state and latch-hold retention during hot-swap transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal latched transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT543PW | Same logic function, identical pinout (TSSOP24), but TI's version specifies tPLH/tPHL ≤ 4.8 ns and IOH = −32 mA (same), IOL = +64 mA (same); HBM ESD = 2000 V (same) | Valid for drop-in replacement in existing TI-based designs; minor propagation delay variance (<0.4 ns) does not affect timing closure in most 5 V bus systems | Select SN74ABT543PW only if sourcing from TI distribution channels or when aligning with TI's broader ABT-family qualification reports |
| 74LVTH543PW | Lower-voltage variant (2.7–3.6 V operation); incompatible VCC range; 3.3 V LVTTL thresholds (VIH = 2.0 V, VIL = 0.8 V); same 24-pin TSSOP package | Requires level-shifting or redesign for 5 V systems; suited for mixed-voltage domains where 3.3 V logic coexists with 5 V peripherals | Choose 74LVTH543PW only in new 3.3 V designs targeting lower power; not interchangeable with 74ABT543APW,112 without voltage translation |
Compared with SN74ABT543PW and 74LVTH543PW, the 74ABT543APW,112 provides guaranteed 5 V operation, higher output drive (64 mA sink), and industrial temperature range - making it optimal for legacy 5 V industrial and computing bus interfaces where voltage compatibility and robust drive strength are primary selection criteria.
Availability
74ABT543APW,112 is available at Aetrix Electronics and suitable for industrial control backplanes, microcontroller peripheral expansion, memory bus interfacing, and legacy parallel I/O applications requiring stable component supply across extended product lifecycles.
Supply support for 74ABT543APW,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, spun off from NXP in 2017 and focused on automotive, industrial, computing, and consumer markets.
The 74ABT543APW,112 belongs to Nexperia's ABT-series advanced BiCMOS logic family, engineered for high-speed, low-power 5 V bus interfacing with enhanced drive strength and latch functionality in space-constrained packages.
FAQ
What is the maximum clock frequency supported by the 74ABT543APW,112?
The 74ABT543APW,112 does not operate on a clock signal - it is an edge-triggered latch-based transceiver. Its usable data rate is determined by propagation delay (≤5.2 ns) and setup/hold timing (≥1.0 ns). In practice, the 74ABT543APW,112 supports reliable operation on 5 V buses running up to 100 MHz with proper layout and termination, assuming latch enable edges align with system timing constraints.
Does the 74ABT543APW,112 support live insertion in backplane applications?
Yes, the 74ABT543APW,112 explicitly supports live insertion and extraction per its datasheet features. Its power-up 3-state behavior, latch-hold retention during power transitions, and robust ESD protection (HBM > 2000 V) make the 74ABT543APW,112 suitable for hot-pluggable modules in industrial backplanes without risk of bus contention or damage.
Can the 74ABT543APW,112 be used with 3.3 V logic levels?
No - the 74ABT543APW,112 is specified only for 4.5 V to 5.5 V supply operation and TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V). While 3.3 V outputs may register as valid LOWs, they risk marginal HIGH recognition and violate recommended operating conditions. For 3.3 V systems, use the pin-compatible 74LVTH543PW instead of the 74ABT543APW,112.
What is the meaning of "back-to-back registers" in the 74ABT543APW,112 functional description?
"Back-to-back registers" refers to the internal architecture of the 74ABT543APW,112: two independent 8-bit D-type latch banks - one for A-to-B data flow and one for B-to-A - placed in series on each data path. This allows simultaneous latching and buffering in both directions, enabling full-duplex operation with independent control of data capture and output enable timing for each direction.
How does the 74ABT543APW,112 handle power-up sequencing in systems with multiple voltage rails?
The 74ABT543APW,112 features inherent power-up 3-state behavior: all outputs enter high-impedance mode during VCC ramp-up until stable supply is reached. This eliminates bus conflicts during staggered rail sequencing. No external reset or enable sequencing is required - the 74ABT543APW,112 is ready for operation once VCC reaches 4.5 V and remains stable, per its recommended operating conditions.
74ABT543APW,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74ABT
- Package/Case:
- 24-TSSOP (0.173", 4.40mm 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-TSSOP
74ABT543APW,112 FAQ
1.How can I place an order for 74ABT543APW,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ABT543APW,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 74ABT543APW,112 reliable?
The price and inventory of 74ABT543APW,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT543APW,112 is usually 5 days.
3.What payment methods are accepted for 74ABT543APW,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ABT543APW,112 transactions.
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4.How is shipping managed for 74ABT543APW,112?
74ABT543APW,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ABT543APW,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 74ABT543APW,112?
For technical support, including 74ABT543APW,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT543APW,112 requirements.
6.How does Aetrix verify that 74ABT543APW,112 is sourced from the original manufacturer or authorized distributors?
All 74ABT543APW,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 74ABT543APW,112 meets industry standards.
7.What is the process for return or replacement of 74ABT543APW,112?
All 74ABT543APW,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT543APW,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 74ABT543APW,112 part is unused and in its original packaging.
Return procedure for 74ABT543APW,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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