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Texas Instruments CY74FCT543ATSOCT
- Part No.:
- CY74FCT543ATSOCT
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT543ATSOCT.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,912
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Product details
Overview
CY74FCT543ATSOCT from Texas Instruments is an 8-bit latched registered transceiver with 3-state outputs, designed for bidirectional data flow control in TTL-compatible bus systems. It features independent A-to-B and B-to-A latch-enable (LEAB/LEBA) and output-enable (OEAB/OEBA) controls, 64-mA sink / 32-mA source drive strength, and operates from 4.75 V to 5.25 V over –40°C to +85°C.
For engineers reviewing the CY74FCT543ATSOCT datasheet, CY74FCT543ATSOCT pinout, CY74FCT543ATSOCT application, or CY74FCT543ATSOCT equivalent, key selection considerations include its 6.5 ns max propagation delay (tPLH/tPHL), Ioff partial-power-down support, edge-rate controlled outputs for noise reduction, and SOIC-24 package compatibility with legacy FCT logic families.
Technical Context
The CY74FCT543ATSOCT implements dual 8-bit D-type latches with separate enable paths for each direction-CEAB/LEAB/OEAB for A→B and CEBA/LEBA/OEBA for B→A-enabling concurrent or isolated bidirectional data staging. Its Ioff circuitry disables outputs when VCC = 0 V, preventing backflow during partial power-down.
It uses edge-rate control to limit slew rate, reducing simultaneous switching noise, and provides matched rise/fall times with TTL-level input thresholds (VIL = 0.8 V, VIH = 2 V) and CMOS-compatible output swing (VOH = 2.4 V min at IOH = –32 mA, VOL = 0.55 V max at IOL = 64 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | FCT advanced CMOS, TTL-input/CMOS-output compatible |
| Supply Voltage | 4.75 V to 5.25 V - ensures stable operation under industrial rail tolerances |
| Propagation Delay | Max 6.5 ns (tPLH/tPHL) - supports high-speed bus timing in 20+ MHz systems |
| Output Drive | 64 mA sink / 32 mA source - drives heavy capacitive loads and multiple TTL inputs |
| Ioff Support | Active at VCC = 0 V - enables safe hot-insertion and partial power-down in modular systems |
| ESD Rating | 2000-V HBM, 200-V MM, 1000-V CDM - meets industrial handling robustness requirements |
| Operating Temp | –40°C to +85°C - qualified for commercial and extended-temperature embedded applications |
Pinout & Package
Package: SOIC-24 (DW), 7.5 mm × 15.4 mm body, 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, MSL Level-1 (unlimited reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A0–A7 | A-side data inputs (or B→A 3-state outputs) |
| 9 | LEBA | B-to-A latch-enable (active low) - controls transparency/storage of B→A latches |
| 10 | OEBA | B-to-A output-enable (active low) - enables/disables B→A 3-state outputs |
| 11 | CEAB | A-to-B enable (active low) - gates A→B data path entry and output activation |
| 12 | GND | Ground reference - common return for all logic and power domains |
| 13 | VCC | Positive supply - powers internal logic and output drivers (4.75–5.25 V) |
| 14 | CEBA | B-to-A enable (active low) - gates B→A data path entry and output activation |
| 15–22 | B0–B7 | B-side data inputs (or A→B 3-state outputs) |
| 23 | LEAB | A-to-B latch-enable (active low) - controls transparency/storage of A→B latches |
| 24 | OEAB | A-to-B output-enable (active low) - enables/disables A→B 3-state outputs |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent latch paths | Separate LEAB/OEAB/CEAB and LEBA/OEBA/CEBA controls allow asynchronous A↔B data staging without contention |
| Edge-rate controlled outputs | Reduced di/dt minimizes ground bounce and crosstalk in dense PCB layouts |
| Ioff partial-power-down | Outputs go high-impedance at VCC = 0 V, enabling safe backplane hot-swap in modular systems |
| TTL-compatible interface | VIH = 2 V min / VIL = 0.8 V max ensures reliable interfacing with legacy 5-V TTL buses |
| Matched rise/fall times | Ensures symmetrical signal edges, reducing jitter and setup/hold margin violations |
Applications
| Industrial Backplane Bus Interface | Modular PLC I/O Expansion |
|---|---|
Use Scenario: Bidirectional data transfer between CPU module and field I/O modules across a shared 8-bit parallel bus. IC Role / Device Role / Timing Role: CY74FCT543ATSOCT acts as a direction-controlled bus transceiver, latching and buffering data during handshaking cycles while isolating modules during reset or fault conditions. Use Value: Its 6.5 ns propagation delay and Ioff support enable deterministic timing and safe hot-swap capability in ruggedized control cabinets. | Use Scenario: Expanding digital input/output capacity on a programmable logic controller rack using plug-in I/O cards. IC Role / Device Role / Timing Role: CY74FCT543ATSOCT serves as a registered interface between the backplane data bus and local card logic, providing storage and isolation per slot. Use Value: Dual latch enables independent read/write staging; 64-mA drive reliably sinks LED indicators and drives optocoupler inputs without external buffers. |
| Legacy System Bus Bridge | Test Equipment Digital Pattern Generator |
Use Scenario: Interfacing modern microcontroller-based controllers to aging industrial equipment with 5-V TTL parallel interfaces. IC Role / Device Role / Timing Role: CY74FCT543ATSOCT bridges voltage and timing domains, translating between CMOS logic levels and TTL-compatible bus signaling with precise edge control. Use Value: Edge-rate control suppresses EMI during high-frequency toggling; TTL input thresholds ensure compatibility with marginal legacy driver outputs. | Use Scenario: Generating synchronized multi-channel digital stimulus waveforms in automated test equipment (ATE) with precise timing alignment. IC Role / Device Role / Timing Role: CY74FCT543ATSOCT latches pattern data from a controller and presents it simultaneously to 8 DUT pins with minimal skew. Use Value: Matched rise/fall times and 6.5 ns max delay guarantee sub-10 ns channel-to-channel skew, critical for high-speed digital vector testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional latched transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY74FCT543TTSOCT | Slower 8.5 ns max propagation delay; same 64-mA/32-mA drive and SOIC-24 package | Suitable for cost-sensitive, lower-speed bus extensions where timing margin is relaxed | Select when system clock rates ≤12 MHz and layout noise sensitivity is low |
| SN74FCT543ATPWR | Texas Instruments' pin-compatible variant in TSSOP-24; identical electrical specs and timing | Preferred for space-constrained PCBs requiring smaller footprint than SOIC | Choose for new designs targeting higher board density; verify thermal derating for same power dissipation |
Compared with CY74FCT543ATSOCT, CY74FCT543TTSOCT trades speed for cost in legacy upgrades, while SN74FCT543ATPWR offers identical performance in a 30% smaller package-both require no logic or timing redesign but differ in thermal profile and board area utilization.
Availability
CY74FCT543ATSOCT is available at Aetrix Electronics and suitable for industrial backplane interfaces, modular PLC I/O expansion, legacy system bus bridging, and ATE pattern generation requiring stable component supply and long-term production continuity.
Supply support for CY74FCT543ATSOCT 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
Texas Instruments is a global semiconductor leader delivering analog and embedded processing solutions, with over 90 years of innovation in industrial, automotive, and communications markets.
The CY74FCT543ATSOCT belongs to TI's FCT logic family, engineered for high-noise-immunity, low-skew bidirectional data transfer in mission-critical industrial control and instrumentation systems.
FAQ
What is the maximum operating frequency supported by the CY74FCT543ATSOCT?
The CY74FCT543ATSOCT does not specify a maximum clock frequency, but its 6.5 ns maximum propagation delay (tPLH/tPHL) supports reliable operation in systems with bus toggle rates up to approximately 20 MHz. Timing margins must account for setup/hold (tsu = 2 ns, th = 2 ns) and enable/disable delays (tPZH/tPLZ ≤ 9 ns). For sustained high-speed use, ensure load capacitance remains ≤50 pF per output as defined in the test conditions.
Does the CY74FCT543ATSOCT support hot-swap or partial-power-down operation?
Yes, the CY74FCT543ATSOCT supports partial-power-down via its Ioff feature: when VCC = 0 V, the outputs enter high-impedance state and leakage current is limited to ±1 µA (measured at VOUT = 4.5 V), preventing damaging back-current flow. This enables safe insertion/removal in live backplanes and modular systems-provided all unused inputs are tied to VCC or GND per datasheet guidance.
What are the absolute maximum ratings for the CY74FCT543ATSOCT supply and I/O voltages?
The CY74FCT543ATSOCT has an absolute maximum supply voltage of –0.5 V to 7 V, and DC input/output voltage range of –0.5 V to 7 V. Exceeding these limits may cause permanent damage. Recommended operating conditions restrict VCC to 4.75–5.25 V and ambient temperature to –40°C to +85°C. Input voltages must remain within VIL ≤ 0.8 V (low) and VIH ≥ 2.0 V (high) for guaranteed logic recognition.
How does the CY74FCT543ATSOCT differ from the CY54FCT543T in terms of drive strength and temperature range?
The CY74FCT543ATSOCT delivers 64-mA sink / 32-mA source output drive and operates from –40°C to +85°C, whereas the CY54FCT543T provides 48-mA sink / 12-mA source drive and is rated for –55°C to +125°C. The CY74FCT543ATSOCT targets commercial/industrial applications needing higher drive and tighter timing (6.5 ns vs. 10 ns), while the CY54FCT543T suits military/aerospace environments with wider temperature tolerance but lower current capability.
Can the CY74FCT543ATSOCT be used as a direct replacement for standard 74LS245 or 74F245 transceivers?
The CY74FCT543ATSOCT is functionally compatible with 74LS245/74F245 in pin count and basic direction-control behavior, but differs critically: it requires separate latch-enable (LEAB/LEBA) signals for registered operation and lacks built-in direction-control logic (DIR pin). To replace LS/F245 in non-latched mode, tie LEAB and LEBA low and use OEAB/OEBA for 3-state control-but timing, drive strength, and noise characteristics will differ significantly due to FCT architecture.
CY74FCT543ATSOCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- 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:
- 32mA, 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
CY74FCT543ATSOCT FAQ
1.How can I place an order for CY74FCT543ATSOCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT543ATSOCT 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 CY74FCT543ATSOCT reliable?
The price and inventory of CY74FCT543ATSOCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT543ATSOCT is usually 5 days.
3.What payment methods are accepted for CY74FCT543ATSOCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT543ATSOCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT543ATSOCT?
CY74FCT543ATSOCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT543ATSOCT 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 CY74FCT543ATSOCT?
For technical support, including CY74FCT543ATSOCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT543ATSOCT requirements.
6.How does Aetrix verify that CY74FCT543ATSOCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT543ATSOCT 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 CY74FCT543ATSOCT meets industry standards.
7.What is the process for return or replacement of CY74FCT543ATSOCT?
All CY74FCT543ATSOCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT543ATSOCT, 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 CY74FCT543ATSOCT part is unused and in its original packaging.
Return procedure for CY74FCT543ATSOCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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