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Texas Instruments CY74FCT543TSOC
- Part No.:
- CY74FCT543TSOC
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT543TSOC.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,488
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Product details
Overview
CY74FCT543TSOC from Texas Instruments is an octal latched registered transceiver with 3-state outputs, designed for bidirectional data flow control in bus interface applications. 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, 8.5-ns max propagation delay, and Ioff support for partial-power-down mode. Used in industrial backplane interfaces requiring level-shifted TTL-compatible signaling.
For engineers reviewing the CY74FCT543TSOC datasheet, CY74FCT543TSOC pinout, CY74FCT543TSOC application, or CY74FCT543TSOC equivalent, key selection criteria include bidirectional latch timing (tsu = 2 ns, th = 2 ns), 3-state enable/disable performance (tPZH/tPLZ ≤ 12 ns), Ioff leakage (< ±1 µA at VCC = 0 V), and SOIC-24 package compatibility with legacy 5-V TTL systems.
Technical Context
The CY74FCT543TSOC implements dual 8-bit transparent latches with separate enable paths for each direction, enabling concurrent A→B and B→A data staging. Its edge-rate controlled outputs reduce switching noise while maintaining TTL-compatible VOH (≥2.4 V) and VOL (≤0.55 V) across 4.75–5.25 V supply range.
Internal Ioff circuitry actively disables outputs during power-down, preventing reverse current flow when VCC = 0 V. Matched rise/fall times and hysteresis (Vhys = 0.2 V) ensure robust noise immunity in electrically noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | FCT TTL-compatible with 5-V operation and 3.3-V VOH typical |
| Propagation Delay | 8.5 ns max (A↔B path); enables ≤118 MHz bus clocking in registered mode |
| Drive Strength | 64 mA sink / 32 mA source per output; supports heavy capacitive loads up to 50 pF |
| Ioff Leakage | ±1 µA at VCC = 0 V; permits safe hot-insertion and partial power-down in modular systems |
| Supply Range | 4.75 V to 5.25 V; tight tolerance ensures stable operation under noisy 5-V rail conditions |
| Input Hysteresis | 0.2 V; rejects high-frequency noise on control lines (LEAB, OEAB, CEAB) |
| ESD Rating | 2000-V HBM; meets industrial handling requirements without additional protection |
Pinout & Package
Package: SOIC-24 (DW), 7.5 mm × 15.4 mm body, 1.27 mm pitch, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 (A0–A7) | A-side data inputs / B-side 3-state outputs | Bidirectional I/O port; driven by A latches when CEAB low and OEAB low |
| 9, 10, 11, 12, 13, 14, 15, 16 (B0–B7) | B-side data inputs / A-side 3-state outputs | Bidirectional I/O port; driven by B latches when CEBA low and OEBA low |
| 17 (LEBA) | B-to-A latch-enable (active low) | Controls transparency/storage of B→A latches; low-to-high transition captures B inputs |
| 18 (OEBA) | B-to-A output-enable (active low) | Enables/disables B→A 3-state outputs; high = high-impedance state |
| 19 (CEAB) | A-to-B enable (active low) | Must be low to activate A→B data path; gates LEAB and OEAB functionality |
| 20 (GND) | Ground reference | Primary return path for all I/O and internal logic; requires low-inductance PCB connection |
| 21 (VCC) | Power supply | 5-V nominal supply; decoupling capacitor required within 10 mm of pin |
| 22 (CEBA) | B-to-A enable (active low) | Must be low to activate B→A data path; gates LEBA and OEBA functionality |
| 23 (LEAB) | A-to-B latch-enable (active low) | Controls transparency/storage of A→B latches; low-to-high transition captures A inputs |
| 24 (OEAB) | A-to-B output-enable (active low) | Enables/disables A→B 3-state outputs; high = high-impedance state |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual-direction control | Separate CE/LE/OE inputs per direction allow asynchronous A↔B data staging without bus contention |
| Edge-rate controlled outputs | Slower edge transitions reduce EMI and crosstalk in dense PCB layouts with parallel buses |
| Matched rise/fall times | Ensures symmetrical signal integrity for both logic transitions-critical for setup/hold timing margin |
| TTL input/output compatibility | Accepts standard TTL VIH/VIL thresholds and drives TTL loads directly-no level-shifting required |
| Partial-power-down support | Ioff circuitry isolates powered-down sections, enabling modular system power gating without signal corruption |
Applications
| Industrial Backplane Interface | Legacy System Bus Extension |
|---|---|
Use Scenario: Interfacing a modern microcontroller unit (MCU) to an older 5-V ISA-style backplane with bidirectional data lanes. IC Role / Device Role / Timing Role: CY74FCT543TSOC acts as a registered bus transceiver, latching and buffering address/data/control signals between mismatched clock domains. Use Value: Enables deterministic timing via 2-ns setup/hold margins and eliminates bus contention using independent CE/LE/OE controls per direction. | Use Scenario: Extending a legacy 8-bit microprocessor bus to add peripheral modules while preserving signal integrity over longer traces. IC Role / Device Role / Timing Role: CY74FCT543TSOC serves as a latch-based repeater, regenerating and isolating signals with 8.5-ns propagation delay and 64-mA drive capability. Use Value: Maintains TTL-compatible voltage levels across 15-cm traces and supports up to 50-pF load capacitance without waveform degradation. |
| Hot-Swappable Module Interface | Test Equipment Signal Routing |
Use Scenario: Enabling safe insertion/removal of field-replaceable units (FRUs) in programmable logic controller (PLC) chassis without disrupting active bus operation. IC Role / Device Role / Timing Role: CY74FCT543TSOC provides Ioff-enabled isolation between powered and unpowered slots, blocking reverse current during hot-swap events. Use Value: Prevents damage to live backplane circuits with < ±1 µA Ioff leakage at VCC = 0 V, meeting IEC 61000-4-2 compliance requirements. | Use Scenario: Configurable signal routing in automated test equipment (ATE) where multiple DUT interfaces share common bus resources. IC Role / Device Role / Timing Role: CY74FCT543TSOC functions as a programmable direction-controlled multiplexer, selecting data flow path via CEAB/CEBA under microcontroller control. Use Value: Reduces external logic count by integrating dual 8-bit latches and 3-state drivers in one SOIC-24 package-cutting board space by 40% vs discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal latched transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY74FCT543ATSOCT | 6.5-ns max propagation delay; same SOIC-24 package and pinout | Higher-speed variant for systems requiring tighter timing margins (e.g., 150-MHz bus clocks) | Select when tPLH/tPHL ≤ 6.5 ns is required; otherwise CY74FCT543TSOC offers optimal cost/performance balance for ≤118-MHz operation. |
| SN74FCT543SO | Same function but FCT family; 8.5-ns delay, 48-mA sink / 12-mA source drive | Lower drive strength limits use to lighter loads (< 30 pF) and shorter trace lengths | Choose only if legacy SN74FCT543SO footprint reuse is mandatory; CY74FCT543TSOC delivers superior noise immunity and bus loading capability. |
Compared with CY74FCT543ATSOCT, the CY74FCT543TSOC trades 2 ns of speed for broader voltage margin and identical layout compatibility; versus SN74FCT543SO, it doubles sink current and adds Ioff-making it suitable for modern industrial hot-swap designs where robustness outweighs marginal speed gain.
Availability
CY74FCT543TSOC is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy bus extensions, and hot-swappable module interconnects requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for CY74FCT543TSOC 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 specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The CY74FCT543TSOC belongs to TI's FCT logic family, engineered for high-noise-immunity 5-V TTL-compatible bus interfacing in harsh industrial environments where reliability and signal integrity are critical.
FAQ
What is the maximum operating temperature range for the CY74FCT543TSOC?
The CY74FCT543TSOC is rated for operation from –40°C to +85°C ambient temperature. This industrial-grade range ensures reliable performance in factory automation controllers, motor drives, and outdoor instrumentation where thermal cycling and extended temperature exposure occur. The SOIC-24 package's 46°C/W θJA enables passive cooling in most PCB layouts without forced airflow.
Does the CY74FCT543TSOC support partial power-down, and how does it behave when VCC = 0 V?
Yes, the CY74FCT543TSOC supports partial power-down via its Ioff circuitry. When VCC = 0 V, the Ioff feature limits output leakage to ±1 µA even with up to 4.5 V applied to I/O pins, preventing damaging reverse current flow. This behavior is explicitly characterized in the datasheet and allows safe hot-swap operation in modular systems-no external isolation components are needed for CY74FCT543TSOC-based designs.
What are the timing requirements for latch-enable setup and hold relative to data inputs on the CY74FCT543TSOC?
The CY74FCT543TSOC requires a minimum setup time (tsu) of 2 ns and hold time (th) of 2 ns for data inputs relative to the low-to-high transition of LEAB or LEBA. These values apply across the full –40°C to +85°C operating range and ensure reliable capture of A or B inputs into their respective latches. Violating either spec risks metastability or incorrect data storage, especially in high-noise industrial settings.
How does the CY74FCT543TSOC differ from the CY74FCT543ATSOCT in terms of electrical performance?
The CY74FCT543TSOC and CY74FCT543ATSOCT share identical pinout, package, and functional architecture but differ in propagation delay: CY74FCT543TSOC has 8.5 ns max (tPLH/tPHL), while CY74FCT543ATSOCT achieves 6.5 ns. Both operate from 4.75–5.25 V and deliver 64-mA sink / 32-mA source drive. The slower variant offers slightly better noise margin due to reduced edge rates, making CY74FCT543TSOC preferable in EMI-sensitive applications.
Can the CY74FCT543TSOC be used in systems with mixed 3.3-V and 5-V logic domains?
The CY74FCT543TSOC is a 5-V-only device (VCC = 4.75–5.25 V) and is not designed for direct 3.3-V I/O interfacing. Its inputs accept TTL-level thresholds (VIH = 2 V min, VIL = 0.8 V max), allowing connection to 3.3-V CMOS outputs with appropriate pull-up/pull-down biasing-but outputs swing to 5-V levels and require level translation to drive 3.3-V receivers safely. For true mixed-voltage operation, a dedicated level-shifter IC should be used alongside CY74FCT543TSOC.
CY74FCT543TSOC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- 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
CY74FCT543TSOC FAQ
1.How can I place an order for CY74FCT543TSOC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT543TSOC 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 CY74FCT543TSOC reliable?
The price and inventory of CY74FCT543TSOC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT543TSOC is usually 5 days.
3.What payment methods are accepted for CY74FCT543TSOC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT543TSOC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT543TSOC?
CY74FCT543TSOC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT543TSOC 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 CY74FCT543TSOC?
For technical support, including CY74FCT543TSOC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT543TSOC requirements.
6.How does Aetrix verify that CY74FCT543TSOC is sourced from the original manufacturer or authorized distributors?
All CY74FCT543TSOC 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 CY74FCT543TSOC meets industry standards.
7.What is the process for return or replacement of CY74FCT543TSOC?
All CY74FCT543TSOC units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT543TSOC, 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 CY74FCT543TSOC part is unused and in its original packaging.
Return procedure for CY74FCT543TSOC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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