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NXP Semiconductors N74F543DB,112
- Part No.:
- N74F543DB,112
- Manufacturer:
- NXP Semiconductors
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
N74F543DB,112.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,259
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Product details
Overview
N74F543DB,112 from NXP Semiconductors (formerly Philips) is an octal registered transceiver with non-inverting 3-state outputs, integrating dual 8-bit D-type latches and independent A↔B bidirectional data flow control. It delivers 6.0 ns typical propagation delay (A→B), supports 5 V ±10 % supply, and provides B-port output drive up to 64 mA sink / 15 mA source for high-current bus interfacing in industrial control backplanes.
For engineers reviewing the N74F543DB,112 datasheet, N74F543DB,112 pinout, N74F543DB,112 application, or N74F543DB,112 equivalent, key selection criteria include latch enable timing (min 4.0 ns LE pulse width), separate OE/LE/E controls per direction, differential drive capability (A port: 24 mA sink; B port: 64 mA sink), and SSOP24 package compatibility with high-density PCB layouts.
Technical Context
The N74F543DB,112 implements two independent 8-bit D-type latch banks-one for A-to-B and one for B-to-A data paths-with dedicated Latch Enable (LEAB/LEBA), Output Enable (OEAB/OEBA), and Enable (EAB/EBA) inputs. Each latch bank operates transparently when its LE is LOW and stores data on the LOW-to-HIGH transition of LE.
Its 3-state outputs support bus-oriented systems: A-port outputs are rated for 24 mA sink / 3 mA source; B-port outputs deliver higher drive at 64 mA sink / 15 mA source. Propagation delays range from 2.5 ns (B→A) to 6.0 ns (A→B), with output enable/disable times as low as 1.0 ns (disable) and 1.5 ns (enable).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures stable operation across standard TTL-compatible 5 V rails with ±10 % tolerance. |
| Propagation Delay (A→B) | 6.0 ns typical - enables high-speed data transfer between CPU and peripheral buses without timing bottlenecks. |
| B-port Output Sink Current | 64 mA - drives heavy capacitive loads or multiple TTL inputs directly without external buffers. |
| A-port Output Sink Current | 24 mA - sufficient for standard TTL fan-out while conserving power on lower-drive side. |
| Operating Temperature | 0 °C to +70 °C - validated for commercial-grade embedded systems and industrial control panels. |
| Input Loading (UL) | 1.0–3.5 FAST Unit Loads - minimizes loading on upstream drivers and maintains signal integrity in daisy-chained configurations. |
| Package Type | SSOP24 (SOT340-1), 5.3 mm body width - supports compact PCB layouts with 0.65 mm lead pitch and thermal performance suitable for reflow assembly. |
Pinout & Package
Package: SSOP24 (plastic shrink small outline package; 24 leads; body width 5.3 mm; SOT340-1). Pin 24 = VCC; Pin 12 = GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 24) | Positive supply rail | Provides 5 V power to internal logic and output drivers; decoupling capacitor required near this pin. |
| GND (Pin 12) | Ground reference | Common return path for all I/O and internal circuitry; must be low-impedance connection. |
| A0–A7 (Pins 10–3) | Port A bidirectional I/O | 3-state inputs/outputs with 24 mA sink capability; used for data reception from or transmission to CPU-side bus. |
| B0–B7 (Pins 23–16) | Port B bidirectional I/O | 3-state inputs/outputs with 64 mA sink capability; interfaces with high-drive peripherals or memory subsystems. |
| LEAB (Pin 15) | A-to-B latch enable | Active LOW; controls transparency/storage mode of A→B latches; requires min 4.0 ns LOW pulse width. |
| LEBA (Pin 13) | B-to-A latch enable | Active LOW; controls transparency/storage mode of B→A latches; independent timing from LEAB. |
| OEAB (Pin 14) | A-to-B output enable | Active LOW; enables/disables B-port 3-state outputs; high-impedance state isolates B bus when inactive. |
| OEBA (Pin 11) | B-to-A output enable | Active LOW; enables/disables A-port 3-state outputs; allows A bus to float during B→A transfers. |
| EAB (Pin 1) | A-to-B enable | Active LOW; gates data flow into A→B latches; must be LOW before LEAB transition for valid capture. |
| EBA (Pin 2) | B-to-A enable | Active LOW; gates data flow into B→A latches; synchronizes with LEBA for reliable B→A registration. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent latch banks | Enables simultaneous A→B and B→A data registration without contention or arbitration logic. |
| Separate OE/LE/E controls per direction | Allows precise timing orchestration-e.g., hold A→B data while initiating new B→A transfer-critical for full-duplex bus protocols. |
| Asymmetric output drive (A: 24 mA / B: 64 mA) | Optimizes power vs. drive trade-off: lower-power A side for controller interface; high-drive B side for memory/peripheral bus loading. |
| 3-state outputs with fast enable/disable | Output disable time as low as 1.0 ns prevents bus contention glitches during direction switching. |
| FAST Unit Load input compatibility | Standardized loading (1.0–3.5 UL) ensures predictable fan-out behavior across mixed-logic families without derating. |
Applications
| Industrial Backplane Interface | Legacy CPU Bus Extension |
|---|---|
|
Use Scenario: Interfacing a microcontroller unit (MCU) with multiple I/O expansion modules over a shared 8-bit parallel backplane. IC Role / Device Role / Timing Role: Registered transceiver providing synchronized, glitch-free bidirectional data transfer between MCU address/data bus and modular peripheral slots. Use Value: Dual latch banks eliminate metastability risk during hot-plug events; 64 mA B-port drive sustains signal integrity across 15 cm backplane traces loaded with 8+ devices. |
Use Scenario: Extending Z80 or 8085 CPU data bus to off-board memory or co-processor cards in retro-computing or test equipment. IC Role / Device Role / Timing Role: Octal registered buffer managing timing-critical read/write handshaking between CPU and external memory-mapped peripherals. Use Value: 6.0 ns A→B propagation delay meets tight Z80 T2 cycle timing; separate LEAB/OEAB control enables precise strobe alignment with WR/RD signals. |
| Programmable Logic Controller (PLC) I/O Module | Test Equipment Data Acquisition Interface |
|
Use Scenario: Isolating and conditioning digital I/O signals between field sensors/actuators and PLC main controller via optocoupled bus segments. IC Role / Device Role / Timing Role: Bidirectional registered interface buffering sensor data into controller and actuator commands out to field devices. Use Value: Independent OEBA/LEBA control allows real-time status polling (B→A) while simultaneously updating actuator states (A→B); 0–70 °C rating matches industrial ambient requirements. |
Use Scenario: Capturing parallel digital waveforms from DUTs (device under test) and forwarding them to FPGA-based acquisition logic in automated test systems. IC Role / Device Role / Timing Role: High-speed registered capture element synchronizing asynchronous DUT outputs to system clock domain before storage or analysis. Use Value: 2.5 ns B→A propagation delay minimizes skew in multi-channel sampling; 3-state A outputs prevent back-driving during FIFO read cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F543N | DIP24 package (SOT222-1); same electrical specs and pinout; no SSOP footprint compatibility. | Suitable for through-hole prototyping or legacy board repair where SSOP rework is impractical. | Select SN74F543N only when manual soldering or socket-based testing is required; not for surface-mount production. |
| 74ACT543SC | ACT family: 5 V CMOS; 8.5 ns max A→B delay; 24 mA B-port sink; TTL-compatible inputs but lower ICC (20 mA typical). | Better noise immunity and lower static power, but slower than F-series; unsuitable for sub-8 ns timing-critical paths. | Choose 74ACT543SC for low-power industrial controllers where 8.5 ns delay is acceptable and EMI robustness is prioritized. |
Compared with N74F543DB,112, SN74F543N offers identical functionality in DIP format for breadboarding, while 74ACT543SC trades speed for lower power and improved noise margin-making it viable only where the 2.5 ns timing advantage of the F-series is noncritical.
Availability
N74F543DB,112 is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy CPU bus extensions, and programmable logic controller (PLC) I/O modules requiring stable component supply across extended production lifecycles.
Supply support for N74F543DB,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, formerly Philips Semiconductors, designs high-reliability logic and interface ICs for industrial, automotive, and communications markets with emphasis on long-term supply stability and automotive-grade qualification.
The 74F logic family-including N74F543DB,112-is engineered for high-speed, low-noise 5 V TTL-compatible systems requiring deterministic timing, robust bus driving, and seamless integration with legacy microprocessor architectures.
FAQ
What is the maximum operating temperature range for the N74F543DB,112?
The N74F543DB,112 is specified for commercial operation from 0 °C to +70 °C. This range is validated per the Recommended Operating Conditions table in the Philips/NXP datasheet and applies to all electrical parameters including propagation delay, output drive, and input thresholds. Operation outside this range may result in undefined timing behavior or reduced reliability, and is not guaranteed by the manufacturer's specifications for the N74F543DB,112.
Does the N74F543DB,112 support true bidirectional data flow without external control logic?
Yes, the N74F543DB,112 supports fully independent bidirectional data flow using dedicated LEAB/LEBA, OEAB/OEBA, and EAB/EBA inputs. Each direction operates autonomously: for example, A→B latching can occur while B→A outputs remain enabled, eliminating need for external arbitration or direction-control gates. This capability is intrinsic to the N74F543DB,112's dual-latch architecture and is confirmed in the Function Table and Functional Description sections of the official datasheet.
What is the minimum pulse width required on LEAB or LEBA for reliable data capture in the N74F543DB,112?
The N74F543DB,112 requires a minimum LOW pulse width of 4.0 ns on LEAB or LEBA (at Tamb = 0 °C to +70 °C, VCC = 5.0 V ±10 %) to ensure reliable data capture into the respective latch bank. This value is specified in the AC Setup Requirements table under "tw(L) Latch enable pulse width, LOW" and is critical for avoiding metastability or incomplete registration-especially in high-frequency bus applications where the N74F543DB,112 is commonly deployed.
Can the N74F543DB,112 be used with 3.3 V logic systems?
No, the N74F543DB,112 is designed exclusively for 5 V ±10 % operation (4.5 V to 5.5 V). Its input thresholds (VIH = 2.0 V min, VIL = 0.8 V max), output voltage levels (VOH ≥ 2.4 V at 3 mA), and internal circuitry are optimized for TTL-compatible 5 V signaling. Interfacing the N74F543DB,112 directly with 3.3 V logic risks incorrect recognition of HIGH/LOW states and potential damage due to VIH/VIL mismatch; level-shifting circuitry is required for interoperability.
How does the output drive capability differ between Port A and Port B on the N74F543DB,112?
Port A outputs (A0–A7) of the N74F543DB,112 are rated for 24 mA sink and 3 mA source current, while Port B outputs (B0–B7) deliver 64 mA sink and 15 mA source. This asymmetry allows Port A to interface with low-power controllers (e.g., microcontrollers) and Port B to drive heavier loads such as multiple TTL inputs or long PCB traces-enabling optimized system-level power distribution without external buffers in the N74F543DB,112 implementation.
N74F543DB,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74F
- 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:
- 3mA, 24mA; 15mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
N74F543DB,112 FAQ
1.How can I place an order for N74F543DB,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for N74F543DB,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 N74F543DB,112 reliable?
The price and inventory of N74F543DB,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for N74F543DB,112 is usually 5 days.
3.What payment methods are accepted for N74F543DB,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for N74F543DB,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for N74F543DB,112?
N74F543DB,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your N74F543DB,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 N74F543DB,112?
For technical support, including N74F543DB,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your N74F543DB,112 requirements.
6.How does Aetrix verify that N74F543DB,112 is sourced from the original manufacturer or authorized distributors?
All N74F543DB,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 N74F543DB,112 meets industry standards.
7.What is the process for return or replacement of N74F543DB,112?
All N74F543DB,112 units undergo pre-shipment inspection (PSI). If there is an issue with N74F543DB,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 N74F543DB,112 part is unused and in its original packaging.
Return procedure for N74F543DB,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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