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Renesas 74FCT543CTSOG8
- Part No.:
- 74FCT543CTSOG8
- Manufacturer:
- Renesas
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74FCT543CTSOG8.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,342
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Product details
Overview
74FCT543CTSOG8 from Renesas Electronics is a non-inverting octal latched transceiver in SOIC-24 package, operating at 5V supply with industrial temperature range (–40°C to +85°C). It provides bidirectional data flow between two 8-bit buses using separate A-to-B and B-to-A latch and output enable controls, with 64mA sink and –15mA source drive capability, and supports live insertion via power-off disable outputs.
For engineers reviewing the 74FCT543CTSOG8 datasheet, 74FCT543CTSOG8 pinout, 74FCT543CTSOG8 application, or 74FCT543CTSOG8 equivalent, key selection criteria include its dual-latch architecture, TTL-compatible I/O levels (VOH = 2.4V min at –8mA, VOL = 0.55V max at 64mA), 5.3ns max propagation delay (74FCT543CT grade), and SOIC-24 footprint compatibility with legacy 74-series bus interfaces.
Technical Context
The 74FCT543CTSOG8 implements two independent sets of eight D-type latches-one for A-to-B and one for B-to-A data paths-each controlled by dedicated CE (chip enable), LE (latch enable), and OE (output enable) inputs. Latch transparency and storage are edge-triggered on LE low-to-high transitions, enabling synchronous capture of bus data.
Its 3-state outputs support hot-swap operation with IOFF ≤ ±1µA at VCC = 0V, and it meets JEDEC Standard 18 for TTL interface compatibility while maintaining CMOS power efficiency (ICC ≤ 1mA typical, ΔICC ≤ 2mA under dynamic load).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 5.0V ±5% - fixed single-rail operation compatible with legacy 5V TTL/CMOS systems |
| Propagation Delay (tPLH/tPHL) | ≤5.3ns (max) - enables high-speed 8-bit bus bridging up to ~100MHz system clock domains |
| Output Drive | IOL = 64mA / IOH = –15mA - drives heavy capacitive loads and multiple TTL inputs without external buffers |
| Input/Output Leakage | ≤±1µA (max) - ensures reliable operation during power sequencing and hot insertion |
| Operating Temperature | –40°C to +85°C - qualified for industrial control, automation, and embedded computing environments |
| Logic Compatibility | TTL-input and TTL-output compatible - interoperates directly with 74LS, 74ALS, and microcontroller GPIOs |
| Quiescent Current | ≤1mA (max) - reduces standby power in always-on bus interface applications |
Pinout & Package
74FCT543CTSOG8 is housed in a 24-pin Small Outline IC (SOIC) package (PSG24 footprint), 7.5mm width, 1.27mm pitch, RoHS-compliant green finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A7 | A-side data I/O | Bi-directional terminals: inputs when driving A→B, 3-state outputs when driving B→A |
| B0–B7 | B-side data I/O | Bi-directional terminals: inputs when driving B→A, 3-state outputs when driving A→B |
| CEAB, CEBA | Chip Enable (active LOW) | Enables respective latch path only when low; disables latching and output drivers when high |
| LEAB, LEBA | Latch Enable (active LOW) | Controls latch transparency (LOW) vs. storage (LOW→HIGH edge); no effect when CE is HIGH |
| OEAB, OEBA | Output Enable (active LOW) | Activates 3-state B or A outputs respectively; outputs go high-Z when HIGH |
| VCC, GND | Power supply | Single 5V rail; decoupling required per JEDEC layout guidelines for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 8-bit latch paths | Enables concurrent A→B and B→A data transfers without bus contention or arbitration logic |
| Live-insertion support | IOFF ≤ ±1µA at VCC = 0V prevents back-driving and damage during hot-plug board replacement |
| TTL-compatible voltage thresholds | VIH = 2.0V min / VIL = 0.8V max ensures robust noise margin with legacy 5V logic families |
| High-current 3-state outputs | 64mA sink capability drives ≥10 standard TTL loads, eliminating need for bus repeaters |
| JEDEC Std 18 compliance | Guarantees interoperability with industry-standard 5V logic systems and test equipment |
Applications
| Industrial PLC Backplane Interface | Legacy Microprocessor Bus Extender |
|---|---|
Use Scenario: Interfacing an ARM-based controller to a legacy 8-bit ISA-style I/O module in a programmable logic controller rack. IC Role / Device Role / Timing Role: Bidirectional bus transceiver with latch synchronization, isolating timing domains between modern CPU and slower peripheral bus. Use Value: Eliminates glue logic by providing simultaneous A→B and B→A latching with independent enables, reducing PCB area and signal routing complexity. | Use Scenario: Extending the data bus of a Z80 or 8085 CPU across a multi-board system with asynchronous timing domains. IC Role / Device Role / Timing Role: Octal latched transceiver acting as a buffered, level-shifted, and direction-controlled bus bridge. Use Value: Supports hot-swappable daughter cards via power-off disable outputs and maintains signal integrity with 64mA drive into 50pF loads. |
| Automated Test Equipment (ATE) Channel Isolation | Industrial HMI Display Controller Interface |
Use Scenario: Isolating DUT (device under test) signals from tester logic in modular ATE fixtures with mixed-voltage boards. IC Role / Device Role / Timing Role: Directionally controlled, latched signal coupler ensuring deterministic sampling and output isolation. Use Value: Prevents test interference via independent CE/LE/OE controls and guarantees ≤5.3ns delay for precise timing alignment across 8 channels. | Use Scenario: Connecting an FPGA-based display controller to an 8-bit parallel LCD or LED matrix driver with separate write/read cycles. IC Role / Device Role / Timing Role: Latched transceiver managing bidirectional pixel data and control strobes with independent timing control. Use Value: Enables clean separation of display write and read phases using LEAB/LEBA edges, avoiding bus contention during refresh cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal latched transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74FCT543ATSOG8 | Same pinout and function; faster 6.5ns max propagation delay (AT grade vs CT grade) | Better suited for higher-frequency bus timing margins; identical thermal and drive specs | Select 74FCT543ATSOG8 if system timing budget requires <5ns worst-case delay |
| SN74F543N | Bipolar TTL implementation; higher ICC (20mA typical), lower drive (IOL = 20mA), no power-off disable | Lacks live-insertion support and consumes significantly more static power | Choose SN74F543N only for direct drop-in replacement in legacy TTL-only designs where CMOS leakage is not critical |
Compared with 74FCT543CTSOG8, the AT-grade variant offers tighter timing but same packaging and drive, while the SN74F543N trades power efficiency and hot-swap capability for raw TTL compatibility in non-industrial settings.
Availability
74FCT543CTSOG8 is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy microprocessor bus extenders, and automated test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant SOIC packaging.
Supply support for 74FCT543CTSOG8 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
Renesas Electronics Corporation is a global semiconductor leader delivering trusted embedded solutions for automotive, industrial, infrastructure, and IoT applications.
The 74FCT543CTSOG8 belongs to Renesas' Fast CMOS logic family, designed specifically for high-speed, low-power 5V bus interfacing in industrial and computing systems requiring TTL compatibility and robust hot-swap operation.
FAQ
What is the maximum propagation delay of the 74FCT543CTSOG8?
The 74FCT543CTSOG8 has a maximum propagation delay of 5.3ns (tPLH/tPHL) under industrial conditions (CL = 50pF, RL = 500Ω), measured for both A-to-B and B-to-A paths. This value applies to the 'CT' speed grade and is guaranteed across the full –40°C to +85°C temperature range at VCC = 5.0V ±5%. The 74FCT543CTSOG8 achieves this performance while maintaining TTL-compatible output levels and low power consumption.
Does the 74FCT543CTSOG8 support live insertion?
Yes, the 74FCT543CTSOG8 supports live insertion through its power-off disable feature: when VCC = 0V, input/output leakage current is limited to ±1µA maximum, preventing back-driving of powered circuitry. This behavior is explicitly specified in the Absolute Maximum Ratings and DC Electrical Characteristics tables of the Renesas datasheet. The 74FCT543CTSOG8 leverages this to enable safe hot-plug operation in modular backplane and test fixture applications.
What are the logic thresholds for inputs on the 74FCT543CTSOG8?
The 74FCT543CTSOG8 specifies VIH (input HIGH level) as minimum 2.0V and VIL (input LOW level) as maximum 0.8V, ensuring full TTL compatibility. These thresholds are guaranteed over the industrial temperature range and allow direct interfacing with 74LS, 74ALS, and microcontroller GPIOs without level-shifting. The 74FCT543CTSOG8 also exhibits 200mV of input hysteresis to improve noise immunity on slow-rising or noisy control lines like CE and LE.
Can the 74FCT543CTSOG8 operate with a 3.3V supply?
No, the 74FCT543CTSOG8 is rated exclusively for 5.0V ±5% operation and is not specified for 3.3V supply. Its absolute maximum VCC is 5.5V, and all electrical characteristics-including VOH, VOL, drive strength, and timing-are validated only at 5V. Using 3.3V will result in undefined logic levels, degraded noise margins, and failure to meet guaranteed propagation delay or output drive specs. For 3.3V systems, consider Renesas' 74ALVC or 74LVC series instead of the 74FCT543CTSOG8.
How many independent data paths does the 74FCT543CTSOG8 provide?
The 74FCT543CTSOG8 provides two fully independent 8-bit data paths: one for A-to-B and one for B-to-A transfer. Each path has dedicated CE (enable), LE (latch), and OE (output enable) controls, allowing simultaneous or asynchronous operation. This architecture eliminates bus contention and enables true bidirectional latched communication-unlike simple transceivers-making the 74FCT543CTSOG8 ideal for memory-mapped I/O and dual-processor interconnect applications.
74FCT543CTSOG8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 74FCT
- 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:
- 15mA, 64mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
74FCT543CTSOG8 FAQ
1.How can I place an order for 74FCT543CTSOG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74FCT543CTSOG8 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 74FCT543CTSOG8 reliable?
The price and inventory of 74FCT543CTSOG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74FCT543CTSOG8 is usually 5 days.
3.What payment methods are accepted for 74FCT543CTSOG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74FCT543CTSOG8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74FCT543CTSOG8?
74FCT543CTSOG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74FCT543CTSOG8 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 74FCT543CTSOG8?
For technical support, including 74FCT543CTSOG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74FCT543CTSOG8 requirements.
6.How does Aetrix verify that 74FCT543CTSOG8 is sourced from the original manufacturer or authorized distributors?
All 74FCT543CTSOG8 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 74FCT543CTSOG8 meets industry standards.
7.What is the process for return or replacement of 74FCT543CTSOG8?
All 74FCT543CTSOG8 units undergo pre-shipment inspection (PSI). If there is an issue with 74FCT543CTSOG8, 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 74FCT543CTSOG8 part is unused and in its original packaging.
Return procedure for 74FCT543CTSOG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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