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Renesas 74FCT543ATSOG
- Part No.:
- 74FCT543ATSOG
- Manufacturer:
- Renesas
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74FCT543ATSOG.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,028
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Product details
Overview
74FCT543ATSOG from Renesas Electronics is a non-inverting octal latched transceiver in SOIC-24 package, operating at 5.0V ±5% over –40°C to +85°C. It features dual-directional 3-state data flow (A↔B), independent latch and output enable controls per direction, 64mA sink / –15mA source drive, and true TTL-compatible I/O (VIH = 2.0V min, VOL = 0.55V max at 64mA). It is used in industrial backplane bus interfaces requiring bidirectional data isolation and latch synchronization.
For engineers reviewing the 74FCT543ATSOG datasheet, 74FCT543ATSOG pinout, 74FCT543ATSOG application, or 74FCT543ATSOG equivalent, key selection considerations include its dual-latch architecture with separate CE/LE/OE controls per direction, industrial-grade temperature stability, high-current 3-state outputs, and compatibility with legacy TTL logic levels while delivering CMOS power efficiency.
Technical Context
The 74FCT543ATSOG implements two independent octal D-type latch banks-one for A-to-B and one for B-to-A data paths-each with dedicated active-low control inputs: CE (enable), LE (latch edge-triggered), and OE (output buffer enable). Latching occurs on low-to-high transitions of LEAB or LEBA, while CEAB/CEBA must be low for data transparency or storage mode entry.
Its output buffers support live insertion via power-off disable (IOFF ≤ ±1µA at VCC = 0V), meet JEDEC Std 18, and deliver rail-to-rail switching with tPLH/tPHL ≤ 6.5ns (74FCT543AT grade) under CL = 50pF, RL = 500Ω. Input hysteresis (200mV) enhances noise immunity in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 5.0V ±5% - Ensures stable operation across standard industrial 5V rails with tolerance for supply variation. |
| Operating Temperature | –40°C to +85°C - Qualified for continuous use in harsh industrial environments without derating. |
| Output Drive | IOL = 64mA / IOH = –15mA - Sinks sufficient current to drive multiple TTL loads or terminated transmission lines. |
| Propagation Delay | tPLH/tPHL ≤ 6.5ns - Enables reliable 100+ MHz bus handshaking in synchronous backplane designs. |
| Input Compatibility | VIH = 2.0V min, VIL = 0.8V max - Fully interoperable with standard TTL outputs without level-shifting. |
| Power Off Leakage | IOFF ≤ ±1µA at VCC = 0V - Permits hot-plug capability and prevents bus contention during power sequencing. |
| Quiescent Current | ICC ≤ 1mA - Delivers CMOS-level static power consumption despite TTL-compatible drive strength. |
Pinout & Package
74FCT543ATSOG is housed in a 24-pin Small Outline IC (SOIC) package, code PSG24, with 300-mil body width and standard gull-wing lead form. Pin spacing is 0.050", and the package is RoHS-compliant and green (halogen-free).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A7 | A-side bidirectional I/O terminals | Function as inputs when CEAB/LEAB active for A→B latching; become 3-state outputs when CEBA active for B→A flow. |
| B0–B7 | B-side bidirectional I/O terminals | Function as inputs when CEBA/LEBA active for B→A latching; become 3-state outputs when CEAB active for A→B flow. |
| CEAB | A-to-B Enable (active LOW) | Enables A-input sampling or B-output sourcing only when low; disables latch transparency and output drivers when high. |
| CEBA | B-to-A Enable (active LOW) | Enables B-input sampling or A-output sourcing only when low; isolates B-side logic when high. |
| LEAB | A-to-B Latch Enable (active LOW, edge-triggered) | Low-to-high transition captures A0–A7 values into A latches; maintains stored data when high. |
| LEBA | B-to-A Latch Enable (active LOW, edge-triggered) | Low-to-high transition captures B0–B7 values into B latches; holds data independently of CEAB/CEBA state. |
| OEAB | A-to-B Output Enable (active LOW) | Activates B0–B7 3-state drivers when low; places them in high-impedance when high - independent of latch state. |
| OEBA | B-to-A Output Enable (active LOW) | Activates A0–A7 3-state drivers when low; enables bidirectional bus sharing without contention. |
| VCC | Positive supply | 5V nominal supply pin; decoupling required within 10mm for noise-sensitive high-speed operation. |
| GND | Ground reference | Primary signal return; must be low-inductance connection to minimize ground bounce during 64mA switching. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent latch banks | Enables concurrent A→B and B→A data capture with separate timing control, eliminating bus turnaround delays. |
| TTL-compatible I/O with CMOS power | Accepts and drives standard TTL logic levels while consuming ≤1mA quiescent current - ideal for mixed-logic system upgrades. |
| Live-insertion support | IOFF ≤ ±1µA at VCC = 0V ensures no leakage-induced bus contention during hot-swap events in modular systems. |
| High-noise-immunity inputs | 200mV input hysteresis reduces susceptibility to ground bounce and EMI in electrically noisy industrial enclosures. |
| JEDEC Std 18 compliance | Guarantees interoperability with industry-standard logic families and validates robustness for long-term deployment. |
Applications
| Industrial Backplane Interface | Legacy System Bus Extender |
|---|---|
|
Use Scenario: Bidirectional data transfer between CPU module and I/O expansion cards in a ruggedized PLC rack with shared 8-bit data bus. IC Role / Device Role / Timing Role: Octal latched transceiver providing isolated, synchronized A↔B data path with independent latch and output control per direction. Use Value: Eliminates bus turnaround overhead by allowing simultaneous read/write staging; 64mA drive sustains signal integrity across 30cm backplane traces. |
Use Scenario: Interfacing a modern microcontroller-based controller to an aging ISA-compatible peripheral card requiring TTL-level handshake signals. IC Role / Device Role / Timing Role: Level-translating, latched bus transceiver that bridges 3.3V/5V domains while preserving timing margins for legacy timing protocols. Use Value: True TTL input thresholds (VIH = 2.0V) and 5V-compatible outputs ensure drop-in compatibility without external resistors or translators. |
| Modular Test Equipment Data Link | Programmable Logic Carrier Board |
|
Use Scenario: Configurable instrument module exchanging calibration data and control commands with mainframe via shared 8-bit parallel bus. IC Role / Device Role / Timing Role: Hot-pluggable transceiver enabling safe module insertion/removal while maintaining bus integrity via power-off disable. Use Value: IOFF ≤ ±1µA prevents false triggering or bus loading during insertion; industrial temp range supports uncooled chassis operation. |
Use Scenario: FPGA carrier board using 74FCT543ATSOG to route configuration data between flash memory and FPGA JTAG pins during power-up. IC Role / Device Role / Timing Role: Controlled-direction latched buffer ensuring glitch-free data capture from non-synchronous sources into FPGA registers. Use Value: Edge-triggered LEAB/LEBA allows precise capture window alignment; 6.5ns propagation delay supports >100MHz clock domain bridging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal latched transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74FCT543CTQG | Same functionality and pinout, but C-grade (commercial temp: 0°C to +70°C); slightly faster max propagation delay (5.3ns vs 6.5ns). | Not rated for industrial ambient extremes; unsuitable for uncooled enclosures or outdoor deployments. | Select only for cost-sensitive commercial equipment with controlled thermal environments. |
| SN74F543N | Bipolar TTL implementation; higher ICC (20mA typical), lower drive (IOL = 20mA), no power-off disable (IOFF not specified). | Lacks live-insertion capability and consumes significantly more static power; incompatible with low-power system budgets. | Use only for legacy board repairs where exact TTL family behavior is mandatory and power/thermal constraints are secondary. |
Compared with 74FCT543CTQG and SN74F543N, the 74FCT543ATSOG uniquely combines industrial temperature rating, live-insertion safety, and CMOS efficiency with full TTL compatibility - making it the sole choice for new industrial designs requiring reliability, low power, and field-serviceability.
Availability
74FCT543ATSOG is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy bus extenders, modular test equipment data links, and programmable logic carrier boards requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74FCT543ATSOG 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 is a global semiconductor leader specializing in microcontrollers, analog, power, and timing solutions for industrial, automotive, and infrastructure markets.
The 74FCT543ATSOG belongs to Renesas' Fast CMOS logic family, designed specifically for high-reliability industrial systems requiring TTL compatibility, low power, and robust operation across wide temperature ranges.
FAQ
What is the maximum clock frequency supported by the 74FCT543ATSOG for reliable latch operation?
The 74FCT543ATSOG does not contain an internal clock; it is edge-triggered on LEAB/LEBA low-to-high transitions. Its minimum LE pulse width is 5ns, and propagation delay is ≤6.5ns, supporting effective latch rates up to ~100MHz in well-designed PCB layouts with controlled trace impedance and proper decoupling. For sustained high-frequency operation, ensure setup/hold times (tSU/tH = 2ns each) are met relative to LE edges. The 74FCT543ATSOG remains stable under these conditions across its full –40°C to +85°C range.
Does the 74FCT543ATSOG support hot-swap or live-insertion in powered-backplane systems?
Yes, the 74FCT543ATSOG supports live insertion due to its power-off disable feature: IOFF is guaranteed ≤ ±1µA when VCC = 0V and any input/output voltage is ≤4.5V. This prevents bus contention or back-driving during module insertion/removal in powered systems. The 74FCT543ATSOG maintains this behavior across its full industrial temperature range, making it suitable for modular PLC and test equipment architectures requiring field-replaceable units.
How does the 74FCT543ATSOG differ from standard 74LS543 or 74F543 devices in terms of power and drive capability?
The 74FCT543ATSOG delivers 64mA sink / –15mA source drive - significantly higher than 74LS543 (8mA/0.4mA) and 74F543 (20mA/1mA) - while consuming only ≤1mA quiescent current, versus ~20mA for 74F543. It achieves this via advanced dual-metal CMOS process, enabling TTL-compatible interfacing without bipolar power penalties. Unlike those older families, the 74FCT543ATSOG also specifies IOFF for hot-swap and meets JEDEC Std 18, confirming modern reliability standards.
Can the 74FCT543ATSOG be used for unidirectional data flow, or is bidirectional operation mandatory?
The 74FCT543ATSOG supports fully independent unidirectional operation: CEAB/LEAB/OEAB can be asserted for A→B flow while CEBA/LEBA/OEBA remain inactive (high), and vice versa. Its architecture does not require simultaneous activation of both directions. In practice, many designs use it solely for A→B buffering with B-side pins unused or tied off. The 74FCT543ATSOG's pinout and control logic allow flexible configuration without performance penalty.
What package variant does the suffix 'SOG' indicate for the 74FCT543ATSOG?
The 'SOG' suffix in 74FCT543ATSOG denotes Renesas' Small Outline IC (SOIC) package with 24 pins, package code PSG24. It features a 300-mil body width, gull-wing leads, and RoHS-compliant green (halogen-free) finish. This is distinct from the 'QG' variant (QSOP, PCG24), which has a smaller 150-mil body and tighter 0.65mm lead pitch. The 74FCT543ATSOG's SOG package is optimized for manual assembly, rework, and legacy footprint compatibility.
74FCT543ATSOG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 74FCT
- Package/Case:
- 24-SOIC (0.295", 7.50mm 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:
- 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
74FCT543ATSOG FAQ
1.How can I place an order for 74FCT543ATSOG through Aetrix?
Please submit a Request for Quotation (RFQ) for 74FCT543ATSOG 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 74FCT543ATSOG reliable?
The price and inventory of 74FCT543ATSOG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74FCT543ATSOG is usually 5 days.
3.What payment methods are accepted for 74FCT543ATSOG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74FCT543ATSOG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74FCT543ATSOG?
74FCT543ATSOG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74FCT543ATSOG 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 74FCT543ATSOG?
For technical support, including 74FCT543ATSOG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74FCT543ATSOG requirements.
6.How does Aetrix verify that 74FCT543ATSOG is sourced from the original manufacturer or authorized distributors?
All 74FCT543ATSOG 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 74FCT543ATSOG meets industry standards.
7.What is the process for return or replacement of 74FCT543ATSOG?
All 74FCT543ATSOG units undergo pre-shipment inspection (PSI). If there is an issue with 74FCT543ATSOG, 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 74FCT543ATSOG part is unused and in its original packaging.
Return procedure for 74FCT543ATSOG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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