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Texas Instruments CY74FCT2543ATSOC
- Part No.:
- CY74FCT2543ATSOC
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT2543ATSOC.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:865
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Product details
Overview
CY74FCT2543ATSOC from Texas Instruments is an octal latched transceiver IC with dual-direction 3-state outputs, 8-bit A/B bidirectional data paths, independent latch-enable (LEAB/LEBA) and output-enable (OEAB/OEBA) controls, and integrated 25-Ω series output resistors for reflection noise suppression. It operates at 5 V (4.75–5.25 V), supports TTL-compatible logic levels, and delivers ±15 mA output drive.
For engineers reviewing the CY74FCT2543ATSOC datasheet, CY74FCT2543ATSOC pinout, CY74FCT2543ATSOC application, or CY74FCT2543ATSOC equivalent, key selection considerations include its 6.5 ns max propagation delay, Ioff partial-power-down capability, matched rise/fall times, edge-rate control circuitry, and SOIC-24 package compatibility with legacy FCT logic designs.
Technical Context
This device implements two independent sets of eight D-type latches - one for A-to-B and one for B-to-A data flow - each controlled by dedicated CE, LE, and OE inputs. Its back-to-back latch architecture enables simultaneous storage and direction-controlled buffering without external clock synchronization.
The integrated 25-Ω series termination resistors at all outputs reduce transmission-line reflections in high-speed parallel buses, while Ioff circuitry ensures safe operation during partial power-down by disabling outputs and limiting reverse current to ±1 µA when VCC = 0 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75–5.25 V - Ensures stable operation across industrial-grade 5 V rails with ±5% tolerance. |
| Propagation Delay | Max 6.5 ns (tPLH/tPHL) - Enables reliable timing in 150+ MHz bus systems with setup/hold margins. |
| Output Drive | ±15 mA - Sustains robust signal integrity driving multiple TTL loads or unterminated traces. |
| Ioff Current | ±1 µA at VCC = 0 V - Prevents damaging backflow during hot-swap or mixed-voltage board sequencing. |
| Input Thresholds | VIL = 0.8 V, VIH = 2.0 V - Fully compatible with standard TTL input logic levels. |
| ESD Rating | HBM 2000 V, MM 200 V, CDM 1000 V - Meets JEDEC JESD22 requirements for handling and assembly robustness. |
| Package | SOIC-24 (DW) - Standard 0.300″ wide body with 1.27 mm pitch, compatible with automated SMT placement. |
Pinout & Package
SOIC-24 (DW) package: 0.300″ wide body, 1.27 mm lead pitch, 7.5 mm × 15.4 mm footprint, 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-to-A 3-state outputs) - Bidirectional I/O pins for A port. |
| 9, 10, 11, 12, 13, 14, 15, 16 | B0–B7 | B-side data inputs (or A-to-B 3-state outputs) - Bidirectional I/O pins for B port. |
| 17 | CEAB | A-to-B enable (active low) - Controls data path activation from A to B. |
| 18 | GND | Ground reference - Primary return path for all digital and I/O currents. |
| 19 | VCC | Power supply - Supplies core logic and output drivers at 5 V nominal. |
| 20 | CEBA | B-to-A enable (active low) - Controls data path activation from B to A. |
| 21, 22 | LEBA, OEBA | B-to-A latch-enable and output-enable - Independently control storage and output state for B→A flow. |
| 23, 24 | LEAB, OEAB | A-to-B latch-enable and output-enable - Independently control storage and output state for A→B flow. |
Key Features
| Feature | Design Value |
|---|---|
| Edge-Rate Controlled Outputs | Slower edge transitions reduce EMI and crosstalk in dense PCB layouts without external RC networks. |
| On-Chip 25-Ω Series Resistors | Minimize signal reflections on unterminated or lightly loaded parallel buses, improving eye diagram integrity. |
| Back-to-Back Latch Architecture | Enables true bidirectional latching with independent A→B and B→A storage - no external flip-flops required. |
| Matched Rise/Fall Times | Ensures symmetrical waveform edges, reducing duty-cycle distortion in clock-forwarding or strobe applications. |
| TTL-Compatible Input/Output Levels | Direct interface with legacy 74LS/74ALS logic without level-shifting components. |
Applications
| Bus Interface Bridge | Memory Data Bus Isolation |
|---|---|
Use Scenario: Isolating CPU address/data bus from peripheral subsystems during DMA or reset sequences. IC Role / Device Role / Timing Role: Bidirectional latched transceiver providing direction-controlled, glitch-free data handoff between asynchronous domains. Use Value: Prevents bus contention using independent CE/LE/OE controls and 3-state outputs, enabling clean domain separation without timing skew. | Use Scenario: Buffering 8-bit data between microcontroller and SRAM/EEPROM in embedded control modules. IC Role / Device Role / Timing Role: Latched data path with storage capability, synchronizing read/write cycles across different clock domains. Use Value: Eliminates need for external latch + buffer combinations; back-to-back latches retain data during bus turnaround. |
| Legacy Logic Upgrade | Industrial I/O Expansion |
Use Scenario: Replacing obsolete 74F543 or 74ACT543 in field-upgradeable PLC backplanes. IC Role / Device Role / Timing Role: Pin-compatible FCT-family upgrade offering lower noise, higher drive, and Ioff support. Use Value: Reduces system-level EMI by 25–30% via edge-rate control and on-die termination, with no PCB changes required. | Use Scenario: Expanding GPIO count in programmable logic controllers using parallel I/O expansion cards. IC Role / Device Role / Timing Role: Direction-configurable data highway managing status inputs and control outputs over shared ribbon cables. Use Value: Independent OE/LE per direction allows real-time input sampling and output updating without bus lockup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal latched transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY74FCT2543CTSOC | 5.5 ns max propagation delay (vs. 6.5 ns); identical pinout, voltage, and feature set. | Suitable for higher-speed timing-critical interfaces where <6 ns delay is mandatory. | Select when system timing budget requires tighter propagation specs without changing layout or firmware. |
| SN74FCT543ATPWR | Same 6.5 ns speed grade but uses SSOP-24 (DBQ) package; lacks on-die 25-Ω resistors and edge-rate control. | Requires external series termination for noise-sensitive applications; not drop-in for reflection-critical designs. | Choose only if SOIC-24 footprint is unavailable and board-level termination can be added. |
Compared with CY74FCT2543CTSOC, the CY74FCT2543ATSOC trades 1 ns of speed for broader availability in tube packaging and identical noise-suppression features; versus SN74FCT543ATPWR, it adds integrated termination and edge control - critical for clean signal integrity in unshielded industrial wiring.
Availability
CY74FCT2543ATSOC is available at Aetrix Electronics and suitable for industrial control panels, legacy logic upgrades, and embedded memory interface designs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant SOIC packaging.
Supply support for CY74FCT2543ATSOC 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, with decades of expertise in high-reliability industrial and automotive ICs.
The CY74FCT2543ATSOC belongs to TI's FCT logic family - engineered for noise-immune, TTL-compatible 5 V digital interfacing in industrial automation, test equipment, and legacy system modernization.
FAQ
What is the maximum operating temperature range for CY74FCT2543ATSOC?
The CY74FCT2543ATSOC is rated for continuous operation from –40°C to +85°C ambient temperature, meeting industrial-grade thermal requirements. This range is validated per TI's recommended operating conditions and supported by thermal impedance data (θJA = 46°C/W for SOIC package), ensuring reliable performance in enclosed control cabinets or non-air-conditioned environments where CY74FCT2543ATSOC is deployed.
Does CY74FCT2543ATSOC support partial power-down operation?
Yes, CY74FCT2543ATSOC includes Ioff circuitry that disables all outputs and limits reverse current to ±1 µA when VCC = 0 V. This allows safe insertion or removal in live backplanes and prevents damaging current backflow during mixed-voltage sequencing - a key requirement in modular industrial systems where CY74FCT2543ATSOC interfaces with powered-down subsystems.
How does the edge-rate control in CY74FCT2543ATSOC improve system noise performance?
CY74FCT2543ATSOC uses internal edge-rate control circuitry to moderate signal slew rates, reducing high-frequency spectral content and minimizing crosstalk and ground bounce. Combined with 25-Ω series output resistors, this lowers transmission-line reflections by up to 30% compared to standard FCT transceivers - directly improving signal integrity in CY74FCT2543ATSOC-based parallel bus implementations.
Can CY74FCT2543ATSOC replace CY74FCT543T in existing designs?
Yes, CY74FCT2543ATSOC is functionally and pinout-compatible with CY74FCT543T and offers enhanced noise characteristics due to edge-rate control and on-die termination. The CY74FCT2543ATSOC also maintains identical voltage, timing, and logic-level specifications - making it a direct drop-in upgrade that reduces system-level EMI without requiring PCB or firmware modifications.
What is the purpose of the CEAB and CEBA pins on CY74FCT2543ATSOC?
The CEAB (A-to-B Enable) and CEBA (B-to-A Enable) pins on CY74FCT2543ATSOC are active-low controls that gate data flow direction: CEAB must be low to activate A→B latching/output, and CEBA low for B→A operation. This enables independent bidirectional bus arbitration - for example, allowing CY74FCT2543ATSOC to isolate A and B ports during concurrent read/write cycles in memory-mapped I/O systems.
CY74FCT2543ATSOC 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:
- 15mA, 12mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
CY74FCT2543ATSOC FAQ
1.How can I place an order for CY74FCT2543ATSOC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT2543ATSOC 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 CY74FCT2543ATSOC reliable?
The price and inventory of CY74FCT2543ATSOC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT2543ATSOC is usually 5 days.
3.What payment methods are accepted for CY74FCT2543ATSOC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT2543ATSOC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT2543ATSOC?
CY74FCT2543ATSOC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT2543ATSOC 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 CY74FCT2543ATSOC?
For technical support, including CY74FCT2543ATSOC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT2543ATSOC requirements.
6.How does Aetrix verify that CY74FCT2543ATSOC is sourced from the original manufacturer or authorized distributors?
All CY74FCT2543ATSOC 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 CY74FCT2543ATSOC meets industry standards.
7.What is the process for return or replacement of CY74FCT2543ATSOC?
All CY74FCT2543ATSOC units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT2543ATSOC, 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 CY74FCT2543ATSOC part is unused and in its original packaging.
Return procedure for CY74FCT2543ATSOC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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