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NXP Semiconductors 74LVT543PW,112
- Part No.:
- 74LVT543PW,112
- Manufacturer:
- NXP Semiconductors
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74LVT543PW,112.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,555
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Product details
Overview
74LVT543PW,112 from NXP Semiconductors (formerly Philips) is a 3.3V octal latched transceiver with dual enable and 3-state outputs, integrating D-type latch and bus transceiver functions in one 24-pin TSSOP device. It supports bidirectional data flow between two 8-bit buses with independent A→B and B→A control, delivers ±64mA output drive, and interfaces directly to 5V systems while operating at 3.3V VCC. It is used in high-speed backplane and motherboard bus interface applications requiring latch storage and direction-controlled buffering.
For engineers reviewing the 74LVT543PW,112 datasheet, 74LVT543PW,112 pinout, 74LVT543PW,112 application, or 74LVT543PW,112 equivalent, key selection criteria include dual-latch timing control, 3.3V/5V mixed-voltage bus interfacing, bus-hold inputs eliminating external pull-ups, live insertion capability, and guaranteed 64mA sink current on outputs - all critical for industrial control backplanes and legacy-compatible embedded interconnects.
Technical Context
The 74LVT543PW,112 implements two independent 8-bit D-type latch banks - one for A-to-B and one for B-to-A data paths - each with dedicated Latch Enable (LEAB/LEBA), Enable (EAB/EBA), and Output Enable (OEAB/OEBA) inputs. This architecture enables simultaneous or staggered latching and output gating per direction, supporting transparent, latched, and high-impedance states per port.
It uses BiCMOS technology for TTL-compatible input thresholds (VIL = 0.8V, VIH = 2.0V) and rail-to-rail 5V-tolerant I/O, allowing direct connection to 5V logic without level shifters. Bus-hold circuitry on all A-side inputs maintains valid logic states on unused pins, and power-up 3-state behavior prevents bus contention during system initialization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply Voltage | 2.7V to 3.6V - ensures stable operation across industrial voltage tolerances and low-noise 3.3V domains |
| Output Drive (IOL) | 64mA sink per output - drives heavy capacitive loads and multiple TTL inputs without external buffers |
| Propagation Delay (tPLH/tPHL) | 2.3ns / 3.0ns @ CL=50pF - enables >300MHz bus operation in short-trace applications |
| Input Capacitance (CIN) | 4pF - minimizes loading on upstream drivers and preserves signal integrity at high frequencies |
| Bus-Hold Current (IHOLD) | ±75µA to ±150µA - actively holds A0–A7 inputs at last-valid state, removing need for external pull-up resistors |
| Power-Up State | 3-State outputs - prevents bus contention during power ramp-up, critical for hot-swap and modular systems |
| ESD Protection | 2000V HBM, 200V MM - meets industrial handling requirements without additional protection circuitry |
Pinout & Package
74LVT543PW,112 is housed in a 24-pin plastic thin shrink small outline package (TSSOP), SOT355-1, with 4.4 mm body width and standard JEDEC MO-153 footprint - compatible with automated SMT assembly and space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 14 | LEAB / LEBA | Latch Enable active-Low for A→B or B→A path - controls when input data is captured into respective latch bank |
| 2, 13 | OEAB / OEBA | Output Enable active-Low - places corresponding Bn or An outputs into high-impedance state independently |
| 11, 23 | EAB / EBA | Enable active-Low - gates data flow through respective latch; Low enables transparent or latched output |
| 3–10 | A0–A7 | Port A bidirectional I/O - 3-state outputs with bus-hold; driven by B→A latch when OEBA is active |
| 15–22 | B0–B7 | Port B bidirectional I/O - 3-state outputs; driven by A→B latch when OEAB is active |
| 12 | GND | Ground reference - common return for all internal logic and I/O circuits |
| 24 | VCC | 3.3V supply - powers internal BiCMOS circuitry; tolerant of 2.7–3.6V range |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent latch banks | Enables concurrent A→B and B→A data capture and output control - eliminates arbitration logic in full-duplex bus bridges |
| 5V-tolerant I/O with 3.3V VCC | Direct interface to legacy 5V peripherals without level translators - reduces BOM count and layout complexity |
| Integrated bus-hold on A inputs | Eliminates external pull-up resistors on A0–A7 - saves board space and improves noise immunity on unterminated stubs |
| Live insertion/extraction support | Withstands hot-plug events without latch upset or output contention - essential for modular backplane systems |
| Power-up 3-state and reset | Outputs remain high-Z until VCC stabilizes - prevents spurious writes or bus conflicts during power sequencing |
Applications
| Backplane Data Interface | Industrial PLC I/O Module |
|---|---|
Use Scenario: Bidirectional data transfer between CPU module and peripheral expansion slots in a modular chassis with mixed 3.3V/5V subsystems. IC Role / Device Role / Timing Role: Octal latched transceiver managing synchronous A↔B bus handshaking with independent latch and output control per direction. Use Value: Eliminates need for separate 74LVT245 and 74LVT373 ICs, reducing component count and interconnect delay across slot connectors. |
Use Scenario: Isolating and buffering digital I/O signals between a 3.3V FPGA controller and 5V-rated field sensors/actuators in an industrial enclosure. IC Role / Device Role / Timing Role: Level-shifting transceiver with bus-hold inputs ensuring robust signal retention during sensor cable disconnects or EMI events. Use Value: Prevents floating inputs from causing false triggers; ±64mA drive sustains signal integrity over long 24V-compatible wiring runs. |
| Legacy System Bus Bridge | Hot-Swappable Memory Module |
Use Scenario: Interfacing a modern 3.3V microcontroller to an existing ISA-style 8-bit data bus operating at 5V logic levels. IC Role / Device Role / Timing Role: Voltage-tolerant bidirectional transceiver with latch storage enabling burst-mode transfers without continuous bus occupancy. Use Value: Maintains compatibility with legacy timing budgets while providing latch-based handshake isolation - avoids timing violations on slow 5V bus segments. |
Use Scenario: Enabling safe insertion/removal of memory daughterboards in a telecom line card with powered backplane. IC Role / Device Role / Timing Role: 3-state transceiver with live-insertion tolerance and power-up high-Z behavior protecting main bus during module transition. Use Value: Guarantees no bus contention or latch corruption during hot-swap sequences - certified for use in NEBS-compliant carrier equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal latched transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVT8984DBR | 16-bit version with identical 3.3V/5V I/O, but single-direction latch control and no bus-hold inputs | Requires external pull-ups on unused inputs; suited for wider buses where pin count allows | Select when 16-bit width is needed and bus-hold is not required - otherwise 74LVT543PW,112 offers superior integration for 8-bit links |
| 74ALVT162245DGG | 16-bit non-latched transceiver with 3.3V VCC, 5V-tolerant I/O, but no latch function or bus-hold | Provides only direction-controlled buffering - lacks storage capability for handshake protocols | Choose only for simple unidirectional or bidirectional pass-through; 74LVT543PW,112 remains necessary where data latching is required |
Compared with SN74LVT8984DBR and 74ALVT162245DGG, the 74LVT543PW,112 uniquely combines octal width, dual independent latch control, bus-hold inputs, and live-insertion support - making it the only drop-in solution for space-constrained, latch-dependent 3.3V↔5V bus bridging where reliability under dynamic insertion matters.
Availability
74LVT543PW,112 is available at Aetrix Electronics and suitable for industrial backplane interfaces, PLC I/O modules, and legacy bus bridge designs requiring stable component supply, long-term lifecycle assurance, and verified 3.3V/5V interoperability.
Supply support for 74LVT543PW,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
NXP Semiconductors is a global semiconductor leader delivering high-performance logic, interface, and analog solutions for industrial, automotive, and communications infrastructure markets.
The 74LVT543PW,112 belongs to NXP's legacy LVT (Low-Voltage TTL) logic family, engineered specifically for mixed-voltage system interfacing - bridging 3.3V core logic with 5V peripherals while maintaining TTL timing compatibility and robust ESD/latch-up performance.
FAQ
What is the maximum output sink current specification for the 74LVT543PW,112?
The 74LVT543PW,112 guarantees a minimum output sink current (IOL) of 64mA per output pin under recommended operating conditions (VCC = 3.0V, duty cycle ≤ 50%, f ≥ 1kHz). This rating is confirmed in the DC Electrical Characteristics table and enables direct driving of multiple TTL loads or moderate-capacitance traces without external buffers - a key design advantage over standard LVT devices rated at 32mA.
Does the 74LVT543PW,112 support live insertion and extraction in backplane applications?
Yes, the 74LVT543PW,112 explicitly supports live insertion and extraction, as stated in its Features section. Its BiCMOS construction, power-up 3-state behavior, and latch-up protection (>500mA per JEDEC Std 17) ensure reliable operation during hot-swap events - making it suitable for modular telecom and industrial chassis where modules are added or removed without powering down the entire system.
How does the bus-hold feature work on the 74LVT543PW,112, and which pins does it apply to?
The bus-hold feature on the 74LVT543PW,112 is implemented only on the A0–A7 inputs (pins 3–10), providing ±75µA to ±150µA overdrive current to maintain the last-valid logic state when those inputs are left floating. This eliminates the need for external pull-up resistors on unused A-side lines - a documented design benefit that reduces component count and improves noise margin in unterminated stub configurations.
What is the propagation delay from input to output for the 74LVT543PW,112 under typical conditions?
Under typical conditions (VCC = 3.3V, Tamb = 25°C, CL = 50pF), the 74LVT543PW,112 exhibits tPLH = 2.3ns and tPHL = 3.0ns for signal propagation from An to Bn or Bn to An. These values are specified in the Quick Reference Data table and confirm suitability for high-speed bus applications up to ~300MHz in optimized layouts - significantly faster than standard 74LVT245 equivalents.
Is the 74LVT543PW,112 pin-compatible with other packages of the same part number, such as the SO24 or SSOP variants?
Yes, the 74LVT543PW,112 shares identical pinout and electrical functionality with other package variants (e.g., 74LVT543D in SO24, 74LVT543DB in SSOP), as confirmed by the Pin Configuration diagram and Ordering Information table. All variants use the same 24-pin arrangement, including VCC (pin 24), GND (pin 12), and mirrored control pins (LEAB/LEBA, OEAB/OEBA, EAB/EBA) - enabling direct PCB footprint substitution across package types without redesign.
74LVT543PW,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74LVT
- 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:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
74LVT543PW,112 FAQ
1.How can I place an order for 74LVT543PW,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVT543PW,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 74LVT543PW,112 reliable?
The price and inventory of 74LVT543PW,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVT543PW,112 is usually 5 days.
3.What payment methods are accepted for 74LVT543PW,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVT543PW,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVT543PW,112?
74LVT543PW,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVT543PW,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 74LVT543PW,112?
For technical support, including 74LVT543PW,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVT543PW,112 requirements.
6.How does Aetrix verify that 74LVT543PW,112 is sourced from the original manufacturer or authorized distributors?
All 74LVT543PW,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 74LVT543PW,112 meets industry standards.
7.What is the process for return or replacement of 74LVT543PW,112?
All 74LVT543PW,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74LVT543PW,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 74LVT543PW,112 part is unused and in its original packaging.
Return procedure for 74LVT543PW,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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