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NXP Semiconductors N74F543D,623
- Part No.:
- N74F543D,623
- Manufacturer:
- NXP Semiconductors
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
N74F543D,623.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,125
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Product details
Overview
N74F543D,623 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-to-B/B-to-A data path control. It delivers 6.0 ns typical propagation delay, supports 5 V ±10 % supply, and provides asymmetric drive strength: A-side outputs sink 24 mA / source 3 mA, B-side outputs sink 64 mA / source 15 mA - enabling bidirectional bus interfacing in legacy TTL systems.
For engineers reviewing the N74F543D,623 datasheet, N74F543D,623 pinout, N74F543D,623 application, or N74F543D,623 equivalent, key selection criteria include latch enable timing (tPLH/tPHL ≤ 12.5 ns), output disable time (tPHZ/tPLZ ≤ 12.0 ns), 3-state fan-out capability, and SO24 package compatibility with 7.5 mm body width.
Technical Context
The N74F543D,623 implements two independent 8-bit D-type latch banks - one for A-to-B flow (LEAB/OEAB/EAB controlled) and one for B-to-A flow (LEBA/OEBA/EBA controlled). Each latch bank features transparent mode on LE low and storage mode on LE low-to-high transition, with separate 3-state output enables per direction.
It combines functionality of 74F245 (bus transceiver) and 74F373 (octal D-latch) in a single SO24 package. The B-side outputs are rated for higher current (64 mA sink) to drive heavier loads such as address/data buses, while A-side outputs (24 mA sink) suit lighter control or status lines - supporting asymmetric system-level signal routing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - operates within standard TTL-compatible 5 V rail with ±10 % tolerance |
| Propagation Delay (A→B) | Max 8.5 ns at 5 V - ensures sub-10 ns timing margin for high-speed 5 V bus cycles |
| A-Side Output Drive | Sinks 24 mA / sources 3 mA - sufficient for driving TTL inputs or small LED indicators |
| B-Side Output Drive | Sinks 64 mA / sources 15 mA - capable of directly driving multiple TTL loads or bus stubs |
| 3-State Enable Time | Max 9.0 ns (OE→output) - guarantees fast bus arbitration and minimal contention window |
| Operating Temperature | 0 °C to +70 °C - qualified for commercial-grade embedded and industrial control applications |
| Input Loading | 1.0 FAST Unit Load (20 µA HIGH / 0.6 mA LOW) - compatible with standard 74F-series fan-out rules |
Pinout & Package
Package: SO24 - plastic small outline package, 24 leads, 7.5 mm body width (SOT137-1), surface-mount compatible with standard 0.65 mm pitch PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 24) | Positive supply | 5 V power rail connection; decoupling capacitor required near pin |
| GND (Pin 12) | Ground reference | Common return path for all I/O and internal logic; low-inductance connection critical |
| A0–A7 (Pins 15–22) | Port A bidirectional I/O | 8-bit data port with 3-state outputs; driven by A-latch when OEAB active and EAB low |
| B0–B7 (Pins 2–9) | Port B bidirectional I/O | 8-bit data port with higher-current 3-state outputs; driven by B-latch when OEBA active and EBA low |
| LEAB (Pin 11) | A-to-B latch enable | Active-low control: low = transparent, rising edge = capture A-data into A-latch |
| LEBA (Pin 13) | B-to-A latch enable | Active-low control: low = transparent, rising edge = capture B-data into B-latch |
| OEAB (Pin 10) | A-to-B output enable | Active-low: enables B-port outputs only when EAB is also low and latch holds valid data |
| OEBA (Pin 14) | B-to-A output enable | Active-low: enables A-port outputs only when EBA is also low and latch holds valid data |
| EAB (Pin 1) | A-to-B enable | Active-low gate: must be low for A-data to enter A-latch or appear on B-outputs |
| EBA (Pin 23) | B-to-A enable | Active-low gate: must be low for B-data to enter B-latch or appear on A-outputs |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent latch banks | Enables concurrent A→B and B→A data registration without mutual interference |
| Asymmetric output drive | B-side 64 mA sink supports heavy bus loading; A-side 24 mA sink reduces power for control signals |
| Separate enable controls per direction | Independent LEAB/OEAB/EAB and LEBA/OEBA/EBA allow fine-grained bus arbitration and direction sequencing |
| 3-State bus interface | High-impedance outputs prevent contention during multi-master or shared-bus operation |
| SO24 footprint compatibility | Standard 7.5 mm wide SOIC-24 package enables drop-in replacement in existing 74F designs |
Applications
| Legacy System Bus Interface | Microprocessor Address/Data Latching |
|---|---|
Use Scenario: Interfacing a Z80 or 8085 CPU with external memory or peripheral chips using multiplexed AD bus. IC Role / Device Role / Timing Role: Acts as registered transceiver to separate address and data phases, latching address on LEAB rising edge and driving data on B-port during read/write cycles. Use Value: Eliminates need for discrete 74F245 + 74F373 pair; reduces board space and interconnect delay while maintaining cycle-accurate timing. |
Use Scenario: Capturing and holding 8-bit status or control signals from a microcontroller GPIO port before sending to parallel peripherals. IC Role / Device Role / Timing Role: Provides synchronized, glitch-free latching of asynchronous control bits using LEBA and OEBA, with B-port driving LEDs or relay drivers. Use Value: Ensures stable output during microcontroller interrupt service or context switch; B-port's 64 mA sink drives multiple LEDs without external buffers. |
| Industrial I/O Expansion Module | TTL-Level Bus Arbitration Logic |
Use Scenario: Adding isolated 8-bit input/output capability to a PLC backplane via TTL-compatible expansion slot. IC Role / Device Role / Timing Role: Serves as bidirectional data register between backplane bus and local I/O registers, with EAB/EBA enabling direction-selectable handshaking. Use Value: Supports simultaneous read and write operations across two independent data paths, improving I/O throughput versus single-direction transceivers. |
Use Scenario: Managing shared data bus access among three or more 74F-based subsystems in a test equipment rack. IC Role / Device Role / Timing Role: Functions as direction-controlled bus buffer with precise 3-state timing (tPZH/tPLZ ≤ 8.5 ns) to minimize bus turnaround dead time. Use Value: Reduces bus contention risk during master handoff; fast disable time prevents data corruption during arbitration transitions. |
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 (300 mil), identical AC/DC specs and pinout | Through-hole assembly; no reflow compatibility; larger footprint | Select for prototyping, repair, or legacy through-hole production where SO24 is not feasible |
| 74F543DB | SSOP24 package (5.3 mm width), same electrical specs, 0.65 mm pitch | Higher density SMT layout; requires finer pitch soldering process | Select for space-constrained boards needing smaller footprint than SO24 but retaining 74F543 functionality |
Compared with SN74F543N and 74F543DB, the N74F543D,623 offers the most widely adopted SO24 footprint - balancing ease of assembly, thermal performance, and PCB real estate - making it the preferred choice for new commercial-grade 74F-system designs requiring surface-mount compatibility.
Availability
N74F543D,623 is available at Aetrix Electronics and suitable for legacy system upgrades, industrial control retrofitting, and educational electronics labs requiring stable component supply with long-term obsolescence mitigation.
Supply support for N74F543D,623 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, is a global leader in high-performance analog and logic ICs, with deep heritage in TTL and advanced logic families.
The N74F543D,623 belongs to the 74F Fast TTL logic family, designed specifically for high-speed, low-power 5 V digital systems requiring robust noise immunity and precise timing control in industrial and computing environments.
FAQ
What is the maximum clock frequency supported by the N74F543D,623?
The N74F543D,623 does not operate on a clock signal - it is an asynchronous registered transceiver. Its speed is defined by propagation delay (max 8.5 ns A→B) and setup/hold times (e.g., ts(H) = 3.0 ns). System-level maximum data rate depends on bus cycle timing; for a 5 V TTL bus, it reliably supports >100 MHz effective throughput when used with proper enable/latch sequencing. The N74F543D,623 is not a clocked device but relies on edge-triggered latch enables.
Can the N74F543D,623 replace a 74F245 in a design?
The N74F543D,623 can replace a 74F245 only when latching functionality is also required - it integrates both transceiver and latch functions. Unlike the 74F245, the N74F543D,623 requires separate LE and OE controls and has different pinout (24-pin vs. 20-pin). Direct substitution is not possible without PCB redesign. However, the N74F543D,623 supersedes the functional combination of 74F245 + 74F373 in new designs where registered bus transfer is needed.
What is the meaning of "non-inverting" in the N74F543D,623 description?
"Non-inverting" means that data appearing at the A inputs passes unchanged to the B outputs (and vice versa) when the device is in transparent mode - no logical inversion occurs. This distinguishes it from inverting transceivers like the 74F244. The N74F543D,623 preserves signal polarity across both directions, ensuring compatibility with standard TTL data buses where logic level integrity is critical for address, data, or control signals.
Does the N74F543D,623 support mixed-voltage operation (e.g., 3.3 V inputs)?
No - the N74F543D,623 is specified only for 5 V ±10 % operation (4.5 V to 5.5 V) and TTL-compatible input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V). Applying 3.3 V logic levels may result in undefined behavior or increased power consumption due to partial turn-on of input stages. For mixed-voltage systems, level-shifting circuitry or a 3.3 V–compatible transceiver (e.g., 74LVC245) should be used instead of the N74F543D,623.
How is thermal performance managed in the N74F543D,623 SO24 package?
The N74F543D,623 in SO24 (SOT137-1) package has a typical thermal resistance θJA of ~90 °C/W. At full DC load (ICC ≈ 135 mA), power dissipation reaches ~0.68 W, resulting in ~61 °C junction rise above ambient. Adequate copper pour on VCC/GND pads and placement away from heat sources ensure reliable operation within its 0 °C to +70 °C rating. The N74F543D,623 does not require a heatsink under normal bus-loading conditions.
N74F543D,623 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74F
- Package/Case:
- 24-SOIC (0.295", 7.50mm 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-SO
N74F543D,623 FAQ
1.How can I place an order for N74F543D,623 through Aetrix?
Please submit a Request for Quotation (RFQ) for N74F543D,623 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 N74F543D,623 reliable?
The price and inventory of N74F543D,623 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for N74F543D,623 is usually 5 days.
3.What payment methods are accepted for N74F543D,623?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for N74F543D,623 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for N74F543D,623?
N74F543D,623 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your N74F543D,623 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 N74F543D,623?
For technical support, including N74F543D,623 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your N74F543D,623 requirements.
6.How does Aetrix verify that N74F543D,623 is sourced from the original manufacturer or authorized distributors?
All N74F543D,623 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 N74F543D,623 meets industry standards.
7.What is the process for return or replacement of N74F543D,623?
All N74F543D,623 units undergo pre-shipment inspection (PSI). If there is an issue with N74F543D,623, 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 N74F543D,623 part is unused and in its original packaging.
Return procedure for N74F543D,623:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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