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Texas Instruments CY74FCT543ATSOC
- Part No.:
- CY74FCT543ATSOC
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT543ATSOC.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:859
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Product details
Overview
CY74FCT543ATSOC from Texas Instruments is an 8-bit latched registered transceiver with 3-state outputs, designed for bidirectional data flow control in TTL-compatible bus interfaces. 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, 6.5-ns max propagation delay, and Ioff support for partial-power-down operation in industrial systems.
For engineers reviewing the CY74FCT543ATSOC datasheet, CY74FCT543ATSOC pinout, CY74FCT543ATSOC application, or CY74FCT543ATSOC equivalent, key selection criteria include bidirectional latch timing (tsu = 2 ns, th = 2 ns), 3-state enable/disable times (tPZH/tPLZ ≤ 9 ns), SOIC-24 package compatibility, and compliance with TTL input/output logic levels at VCC = 4.75–5.25 V.
Technical Context
The CY74FCT543ATSOC implements dual 8-bit D-type latches with separate CEAB/CEBA enable inputs to gate data flow direction, and LEAB/LEBA inputs to capture data on low-to-high transitions. Each latch set drives complementary 3-state outputs with edge-rate control circuitry to suppress switching noise.
It supports partial-power-down via Ioff, which disables outputs and blocks reverse current when VCC = 0 V. Input thresholds (VIH = 2 V, VIL = 0.8 V) and output drive (VOH = 2.4 V min at –32 mA, VOL = 0.55 V max at 64 mA) ensure full TTL interoperability across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.75 V to 5.25 V - Ensures stable operation within industrial TTL supply tolerance |
| Propagation Delay (tPLH/tPHL) | 2.5 ns to 6.5 ns - Enables high-speed bidirectional bus transfer up to ~150 MHz effective rate |
| Output Drive | 64 mA sink / 32 mA source - Drives heavy capacitive loads and multiple TTL inputs without buffering |
| Latch Setup/Hold | tsu = 2 ns, th = 2 ns - Supports tight timing margins in synchronous bus architectures |
| Ioff Current | ±1 µA at VCC = 0 V - Prevents backflow damage during hot-swap or power sequencing |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - Meets robustness requirements for manufacturing and field environments |
| Package | SOIC-24 (DW) - Standard footprint compatible with legacy PCB layouts and automated assembly |
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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (LEBA) | B-to-A latch-enable input | Active-low control: low-to-high transition captures B-side data into B-to-A latches |
| 2 (OEBA) | B-to-A output-enable input | Active-low: enables/disables 3-state outputs driving A-bus from B-latches |
| 3–10 (A0–A7) | A-side I/O terminals | Function as inputs (A→B path) or high-impedance outputs (B→A path) depending on CE/OE states |
| 11 (CEAB) | A-to-B enable input | Active-low gate: must be low to allow A-data entry or B-data readout in A→B direction |
| 12 (GND) | Ground reference | Primary return path for all digital and output currents; requires low-inductance PCB connection |
| 13 (VCC) | Power supply | 5-V nominal supply; bypassing with 0.1 µF ceramic capacitor near pin essential for noise suppression |
| 14 (CEBA) | B-to-A enable input | Active-low gate: enables B→A data flow only when asserted low |
| 15–22 (B0–B7) | B-side I/O terminals | Function as inputs (B→A path) or high-impedance outputs (A→B path); electrically identical to A0–A7 |
| 23 (LEAB) | A-to-B latch-enable input | Active-low: low-to-high transition stores A-inputs into A-to-B latches for stable B-output drive |
| 24 (OEAB) | A-to-B output-enable input | Active-low: controls 3-state drivers sourcing B-bus from A-latch outputs |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent latch paths | Separate LEAB/OEAB/CEAB and LEBA/OEBA/CEBA controls enable concurrent A↔B data staging without contention |
| Edge-rate controlled outputs | Internally limited slew rate reduces simultaneous switching noise (SSN) and EMI in dense PCB layouts |
| Matched rise/fall times | tPLH ≈ tPHL ensures symmetrical signal edges, minimizing duty-cycle distortion in clocked systems |
| TTL-compatible interface | VIH/VIL and VOH/VOL thresholds match standard TTL families, eliminating level-shifting in mixed-logic systems |
| Partial-power-down support | Ioff circuitry isolates I/O pins at 0 V supply, enabling safe insertion/removal in live backplanes |
Applications
| Industrial Backplane Bus Interface | Legacy System Data Bridge |
|---|---|
Use Scenario: Bidirectional data exchange between CPU and peripheral modules across a 24-bit parallel backplane operating at 10–20 MHz. IC Role / Device Role / Timing Role: CY74FCT543ATSOC acts as a registered transceiver, latching and isolating signals per direction to prevent bus contention and meet setup/hold timing under skew. Use Value: 2-ns setup/hold and 6.5-ns propagation delay ensure reliable sampling at 20-MHz bus clocks; Ioff prevents damage during hot-plug module replacement. | Use Scenario: Interfacing a modern microcontroller unit (MCU) with an aging ISA-style expansion card requiring TTL-level 8-bit data handshaking. IC Role / Device Role / Timing Role: CY74FCT543ATSOC serves as a direction-controlled latch buffer, synchronizing asynchronous MCU writes to ISA address/data strobes using CEAB/LEAB timing. Use Value: TTL-compatible VIH/VOL and 64-mA drive directly load ISA bus capacitance; SOIC-24 footprint fits retrofit designs without board rework. |
| Test Equipment Signal Routing | Programmable Logic I/O Expansion |
Use Scenario: Configurable signal routing matrix in automated test equipment (ATE), where FPGA-controlled transceivers route stimulus/response signals between DUT and instruments. IC Role / Device Role / Timing Role: CY74FCT543ATSOC provides isolated, latched bidirectional paths under FPGA GPIO control of OEAB/LEAB/CEAB pins. Use Value: 3-state outputs prevent signal conflicts during reconfiguration; edge-rate control minimizes crosstalk in high-density signal interconnects. | Use Scenario: Expanding I/O count of a CPLD-based control system by adding buffered, latched parallel ports for sensor array readout and actuator drive. IC Role / Device Role / Timing Role: CY74FCT543ATSOC functions as a registered I/O port, capturing sensor data on LEBA edges and presenting it to CPLD via B-bus while driving actuators from A-bus. Use Value: Dual-latch architecture allows pipelined read/write operations; 32-mA source capability directly drives LED indicators or small relays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional latched transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74FCT543ATSOCT | Same logic function, identical timing (6.5 ns), but tape-and-reel packaging (2000 pcs) vs. tube (25 pcs) for CY74FCT543ATSOC | Optimized for high-volume SMT production rather than prototyping or low-volume replacement | Select SN74FCT543ATSOCT for automated assembly; retain CY74FCT543ATSOC for manual soldering or small-batch validation |
| 74ACT543SCX | ACT-family variant: higher speed (5.5 ns max), 50-mA sink, but no Ioff support and narrower VCC range (4.5–5.5 V) | Suitable for speed-critical non-hot-swap systems; lacks partial-power-down protection required in modular chassis | Choose 74ACT543SCX only if timing margin is insufficient with CY74FCT543ATSOC and power sequencing is fully controlled |
Compared with SN74FCT543ATSOCT and 74ACT543SCX, CY74FCT543ATSOC uniquely balances industrial temperature range (–40°C to +85°C), Ioff-enabled hot-swap safety, and SOIC-24 tube packaging for engineering validation-making it the preferred choice for design-in and field-replaceable units where reliability and serviceability are prioritized over raw throughput or volume cost.
Availability
CY74FCT543ATSOC is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system upgrades, test equipment signal routing, and programmable logic I/O expansion requiring stable component supply, long-term lifecycle support, and RoHS-compliant SOIC packaging.
Supply support for CY74FCT543ATSOC 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, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The CY74FCT543ATSOC belongs to TI's FCT logic family, engineered for high-drive, low-noise, TTL-compatible bus interfacing in harsh industrial environments where signal integrity and power sequencing resilience are critical.
FAQ
What is the maximum operating frequency supported by CY74FCT543ATSOC in a bidirectional bus application?
CY74FCT543ATSOC does not specify a maximum clock frequency, but its 6.5-ns maximum propagation delay (tPLH/tPHL) and 2-ns setup/hold times enable reliable operation in bus systems with cycle times ≥13 ns - corresponding to an effective data rate of ~77 MHz for single-cycle transfers. Actual achievable frequency depends on PCB trace length, load capacitance, and controller timing margins; for sustained 20-MHz bus operation, CY74FCT543ATSOC is widely deployed with margin.
Does CY74FCT543ATSOC support hot-swap or live-insertion in powered backplanes?
Yes, CY74FCT543ATSOC supports hot-swap via its Ioff feature: when VCC = 0 V, Ioff limits I/O pin leakage to ±1 µA, preventing damaging back-current flow from live bus lines into the unpowered device. This allows safe insertion/removal in systems with controlled power sequencing, provided OEAB/OEBA are held inactive (high) during insertion until VCC stabilizes.
Can CY74FCT543ATSOC drive standard TTL loads directly without external buffers?
Yes, CY74FCT543ATSOC is fully TTL-compatible: its VOH (≥2.4 V at –32 mA) and VOL (≤0.55 V at 64 mA) meet or exceed standard TTL specifications, and its 64-mA sink current exceeds the 16-mA requirement for driving 10 standard TTL inputs. No external buffers are needed for direct TTL fanout in industrial control or instrumentation applications.
What is the purpose of the CEAB and CEBA pins on CY74FCT543ATSOC?
The CEAB (A-to-B Enable) and CEBA (B-to-A Enable) pins on CY74FCT543ATSOC are active-low directional gates that must be asserted low to activate their respective data paths. CEAB low enables A-input sampling and B-output driving; CEBA low enables B-input sampling and A-output driving. They provide hardware-level flow control independent of latch or output enables, preventing unintended data transfer during configuration.
Is CY74FCT543ATSOC pin-compatible with earlier CY54FCT543T variants?
No, CY74FCT543ATSOC is not pin-compatible with CY54FCT543T: the former uses SOIC-24 (DW) packaging rated for –40°C to +85°C, while CY54FCT543T is specified in CDIP-24 (JT) or LCCC-28 (FK) packages for –55°C to +125°C operation. Pin functions are identical, but physical layout, thermal characteristics, and temperature grading differ - direct PCB substitution requires mechanical and thermal validation.
CY74FCT543ATSOC 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
CY74FCT543ATSOC FAQ
1.How can I place an order for CY74FCT543ATSOC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT543ATSOC 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 CY74FCT543ATSOC reliable?
The price and inventory of CY74FCT543ATSOC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT543ATSOC is usually 5 days.
3.What payment methods are accepted for CY74FCT543ATSOC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT543ATSOC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT543ATSOC?
CY74FCT543ATSOC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT543ATSOC 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 CY74FCT543ATSOC?
For technical support, including CY74FCT543ATSOC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT543ATSOC requirements.
6.How does Aetrix verify that CY74FCT543ATSOC is sourced from the original manufacturer or authorized distributors?
All CY74FCT543ATSOC 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 CY74FCT543ATSOC meets industry standards.
7.What is the process for return or replacement of CY74FCT543ATSOC?
All CY74FCT543ATSOC units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT543ATSOC, 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 CY74FCT543ATSOC part is unused and in its original packaging.
Return procedure for CY74FCT543ATSOC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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