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NXP Semiconductors N74F543DB,118
- Part No.:
- N74F543DB,118
- Manufacturer:
- NXP Semiconductors
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
N74F543DB,118.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,429
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Product details
Overview
N74F543DB,118 from NXP Semiconductors (formerly Philips) is an octal registered transceiver with non-inverting 3-state outputs, integrating dual D-type latch functionality for bidirectional data flow control. It features separate A-to-B and B-to-A latch enable (LEAB/LEBA) and output enable (OEAB/OEBA) controls, 64 mA sink capability on B-port outputs, and 24 mA sink on A-port outputs - enabling robust bus interfacing in 5 V TTL systems.
For engineers reviewing the N74F543DB,118 datasheet, N74F543DB,118 pinout, N74F543DB,118 application, or N74F543DB,118 equivalent, this device serves as a high-drive registered transceiver for memory address/data bus isolation, microprocessor system expansion, and legacy TTL bus arbitration where independent direction control and latched storage are required.
Technical Context
The N74F543DB,118 implements two independent 8-bit D-type latch banks - one for A→B and one for B→A data paths - each with dedicated active-low latch enable (LEAB/LEBA) and output enable (OEAB/OEBA) inputs. This architecture enables simultaneous latching and 3-state control per direction without cross-talk.
It supports true bidirectional operation with asymmetric drive strength: B-port outputs deliver 64 mA sink current (vs. 24 mA on A-port), allowing direct interface to heavier-loaded buses or legacy peripherals, while propagation delays remain tightly controlled at ≤12.5 ns (LEAB→Bn) across 0–70 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL logic rails and tolerant of ±10 % variation. |
| A-Port Output Drive | Sinks 24 mA / sources 3 mA - sufficient for driving standard TTL loads and small-capacitance buses. |
| B-Port Output Drive | Sinks 64 mA / sources 15 mA - enables direct connection to high-fanout or legacy peripheral buses without external buffers. |
| Propagation Delay (LEAB→Bn) | Max 12.5 ns at 5 V, 0–70 °C - ensures timing-critical register-to-bus transfer in fast microprocessor systems. |
| 3-State Enable/Disable Time | OEAB/OEBA → Bn: 1.5–9.0 ns enable, 1.0–8.5 ns disable - minimizes bus contention windows during direction switching. |
| Input Loading | A/B ports: 3.5/1.0 FAST Unit Loads (70 µA HIGH / 0.6 mA LOW) - low input current simplifies upstream driver design. |
| Operating Temperature | 0 °C to +70 °C - commercial-grade rating suitable for industrial control panels and embedded computing chassis. |
Pinout & Package
Package: SSOP24 - plastic shrink small outline package, 24 leads, 5.3 mm body width (SOT340-1), surface-mount compatible with fine-pitch PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–8, 15–22 | A0–A7, B0–B7 I/O | Two 8-bit 3-state bidirectional data ports; A-side optimized for source/sink balance, B-side for high sink drive. |
| 9, 10 | LEBA, LEAB | Active-low latch enable inputs - control transparency/storage mode of respective B→A and A→B latches. |
| 11, 13 | OEBA, OEAB | Active-low output enable inputs - independently disable A or B port outputs into high-impedance state. |
| 12 | GND | Ground reference for all logic and output stages; decoupling capacitor placement critical near this pin. |
| 24 | VCC | +5 V supply rail; requires local 0.1 µF ceramic decoupling adjacent to pin for noise suppression. |
| 23, 14 | EBA, EAB | Active-low enable inputs - gate data entry into respective latches; must be LOW before LE transition for valid capture. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent latch banks | Enables concurrent A→B and B→A data registration without shared control timing constraints. |
| Asymmetric output drive (B-port 64 mA) | Eliminates need for external bus drivers when interfacing to high-capacitance or legacy peripheral buses. |
| Separate E and LE controls per direction | Allows precise setup/hold management and eliminates race conditions during bidirectional bus handshaking. |
| 3-State outputs with fast enable/disable | Reduces bus contention risk during direction transitions; sub-10 ns disable time prevents glitches on shared lines. |
| SSOP24 footprint compatibility | Provides space-efficient surface-mount option versus SO24 or DIP24, supporting higher board density in compact systems. |
Applications
| Microprocessor Bus Expansion | Memory Address/Data Isolation |
|---|---|
|
Use Scenario: Expanding an 8086/8088-based system with additional I/O peripherals while maintaining clean address/data bus separation. IC Role / Device Role / Timing Role: Registered transceiver managing bidirectional data flow between CPU and peripheral bus, with latched address strobes and controlled output timing. Use Value: Prevents bus contention during read/write cycles using independent OE/LE controls and provides 64 mA B-port drive for reliable peripheral signaling. |
Use Scenario: Isolating RAM/ROM address and data lines in a multi-board industrial controller to prevent signal corruption during hot-swap or reset events. IC Role / Device Role / Timing Role: Latched transceiver holding stable address values during memory access while enabling 3-state data bus sharing across multiple memory modules. Use Value: Dual latch banks allow simultaneous address latching and data transfer, reducing cycle overhead and improving deterministic timing. |
| Legacy TTL System Interfacing | Industrial Control Backplane Interface |
|
Use Scenario: Connecting modern FPGA-based controllers to legacy TTL-based instrumentation modules requiring strict 5 V logic compliance and high-current drive. IC Role / Device Role / Timing Role: Level- and drive-strength-matched transceiver bridging FPGA I/O to older TTL subsystems with minimal external components. Use Value: B-port's 64 mA sink capability directly drives TTL inputs without pull-up resistors or buffer ICs, simplifying interconnect design. |
Use Scenario: Implementing a modular backplane in programmable logic controllers where field I/O cards exchange status and command data over a shared bus. IC Role / Device Role / Timing Role: Registered bus interface providing glitch-free direction switching, latched status updates, and fault-isolated 3-state control per slot. Use Value: Independent OE/LE per direction allows safe hot-insertion detection and prevents backplane bus lockup during card replacement. |
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 through-hole package; identical electrical specs and pinout; no SSOP thermal or density advantage. | Preferred for prototyping, manual assembly, or legacy through-hole PCBs; not suitable for automated SMT production. | Select SN74F543N only when DIP24 mechanical fit or hand-soldering is required; N74F543DB,118 is optimal for volume SMT manufacturing. |
| 74ACT543SCX | Advanced CMOS (ACT) family; 5 V tolerant, lower ICC (20 mA typical), but B-port sink limited to 24 mA (not 64 mA). | Lower power consumption and improved noise immunity, but insufficient drive for legacy TTL bus loads. | Choose 74ACT543SCX only in new designs with purely CMOS-compatible loads and strict power budgets; N74F543DB,118 remains necessary for TTL bus drive compliance. |
Compared with SN74F543N and 74ACT543SCX, the N74F543DB,118 uniquely delivers SSOP24 packaging with full 64 mA B-port drive - making it the only choice for space-constrained, high-drive legacy bus interfaces requiring surface-mount reliability and commercial temperature operation.
Availability
N74F543DB,118 is available at Aetrix Electronics and suitable for microprocessor bus expansion, memory address/data isolation, and legacy TTL system interfacing requiring stable component supply, long-term obsolescence mitigation, and consistent SSOP24 sourcing.
Supply support for N74F543DB,118 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 focused on secure connectivity solutions for automotive, industrial, and IoT applications, with roots in Philips' pioneering logic IC development.
The 74F logic family - including N74F543DB,118 - was engineered for high-speed, robust 5 V TTL interoperability in industrial control, test equipment, and computer peripheral systems demanding predictable timing and strong drive capability.
FAQ
What is the maximum sink current supported by the B-port outputs of N74F543DB,118?
The B-port outputs (B0–B7) of N74F543DB,118 are rated to sink up to 64 mA per pin under recommended operating conditions (VCC = 4.5–5.5 V, Tamb = 0–70 °C). This specification is verified per the DC Electrical Characteristics table in the Philips/NXP datasheet and enables direct interface to legacy TTL loads without external buffering. The N74F543DB,118 maintains this drive strength across its full commercial temperature range.
Does N74F543DB,118 support true bidirectional latched data transfer?
Yes, N74F543DB,118 supports true independent bidirectional latching via two separate D-type latch banks - one for A→B and one for B→A paths - each with dedicated LEAB/LEBA and OEAB/OEBA controls. This allows simultaneous registration of data flowing in opposite directions without interference, as confirmed by the Function Table and Logic Diagram in the official datasheet. The N74F543DB,118 achieves this without shared clock or enable signals.
What is the propagation delay from LEAB to Bn output for N74F543DB,118?
The maximum propagation delay from LEAB to Bn output for N74F543DB,118 is 12.5 ns under worst-case conditions (VCC = 4.5 V, Tamb = 0–70 °C, CL = 50 pF). This value is specified in the AC Electrical Characteristics table for tPLH/tPHL (LEAB to Bn) and reflects the time required for the latch output to stabilize after the LEAB edge. The N74F543DB,118 guarantees this timing across its full commercial operating range.
Is N74F543DB,118 pin-compatible with other 74F543 package variants?
Yes, N74F543DB,118 is pin-compatible with N74F543D (SO24) and N74F543N (DIP24) - all share identical 24-pin functional mapping per the Pin Configuration diagram. The only difference is physical package: SSOP24 (N74F543DB,118), SO24 (N74F543D), and DIP24 (N74F543N). Electrical behavior, timing, and logic function are identical across these variants, making N74F543DB,118 a drop-in replacement in SSOP-layout designs.
What are the absolute maximum ratings for supply voltage and operating temperature of N74F543DB,118?
The absolute maximum supply voltage for N74F543DB,118 is –0.5 V to +7.0 V, and the absolute maximum operating free-air temperature is 0 °C to +70 °C. These limits are defined in the Absolute Maximum Ratings table of the Philips/NXP datasheet and must not be exceeded to avoid permanent device damage. The N74F543DB,118 is designed for reliable operation within the recommended range of 4.5–5.5 V and 0–70 °C.
N74F543DB,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74F
- Package/Case:
- 24-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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,118 FAQ
1.How can I place an order for N74F543DB,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for N74F543DB,118 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,118 reliable?
The price and inventory of N74F543DB,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for N74F543DB,118 is usually 5 days.
3.What payment methods are accepted for N74F543DB,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for N74F543DB,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for N74F543DB,118?
N74F543DB,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your N74F543DB,118 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,118?
For technical support, including N74F543DB,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your N74F543DB,118 requirements.
6.How does Aetrix verify that N74F543DB,118 is sourced from the original manufacturer or authorized distributors?
All N74F543DB,118 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,118 meets industry standards.
7.What is the process for return or replacement of N74F543DB,118?
All N74F543DB,118 units undergo pre-shipment inspection (PSI). If there is an issue with N74F543DB,118, 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,118 part is unused and in its original packaging.
Return procedure for N74F543DB,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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