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Texas Instruments CY74FCT543ATQCT
- Part No.:
- CY74FCT543ATQCT
- Manufacturer:
- Texas Instruments
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
CY74FCT543ATQCT.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,424
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Product details
Overview
CY74FCT543ATQCT 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 separate A-to-B and B-to-A latch-enable (LEAB/LEBA) and output-enable (OEAB/OEBA) inputs, 64-mA sink / 32-mA source drive strength, and operates from 4.75 V to 5.25 V across –40°C to 85°C.
For engineers reviewing the CY74FCT543ATQCT datasheet, CY74FCT543ATQCT pinout, CY74FCT543ATQCT application, or CY74FCT543ATQCT equivalent, key selection criteria include its 6.5-ns max propagation delay, Ioff partial-power-down support, edge-rate controlled outputs for noise reduction, and SSOP-24 package compatibility with legacy FCT logic families.
Technical Context
The CY74FCT543ATQCT implements dual independent 8-bit latched transceiver channels using D-type transparent latches with active-low enable controls. Each direction (A↔B) uses dedicated CE, LE, and OE inputs to decouple data capture timing from output gating - enabling simultaneous storage and conditional output assertion without bus contention.
Its Ioff circuitry disables all outputs when VCC = 0 V, preventing backflow current during partial power-down. Edge-rate control ensures matched rise/fall times and reduced EMI, while TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) and 3.3-V typical VOH guarantee interoperability with both 5-V TTL and mixed-voltage systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | FCT - Fast CMOS TTL-compatible with 5-V supply and TTL-level inputs/outputs |
| Propagation Delay (tPLH/tPHL) | 6.5 ns max - enables reliable operation in high-speed bus applications up to ~100 MHz clock-equivalent rates |
| Output Drive Strength | 64 mA sink / 32 mA source - supports heavy capacitive loads and fan-out to multiple TTL inputs |
| Supply Voltage Range | 4.75 V to 5.25 V - tight regulation tolerance ensures stable timing and noise immunity in noisy industrial power rails |
| Ioff Support | Active at VCC = 0 V - allows safe insertion/removal in live backplanes and hot-swap subsystems |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - exceeds JEDEC JESD22 standards for robust handling in manufacturing and field service |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control and communications equipment |
Pinout & Package
Package: SSOP-24 (DBQ), 5.3 mm × 7.2 mm body, 0.65 mm pitch, RoHS-compliant NiPdAu lead finish, MSL Level-2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (LEBA) | B-to-A latch-enable input | Active-low control that makes B-to-A latches transparent on low; stores data on low-to-high transition |
| 2 (OEBA) | B-to-A output-enable input | Active-low gate for B-to-A 3-state outputs; high = high-impedance, low = enabled |
| 3–10 (A0–A7) | A-side I/O terminals | Bi-directional: serve as A-to-B inputs or B-to-A outputs depending on CEAB/CEBA state |
| 11 (CEAB) | A-to-B enable input | Active-low master control enabling A-to-B data flow path; must be low for A→B operation |
| 12 (GND) | Ground reference | Primary power return; decoupling capacitor must be placed adjacent to this pin |
| 13 (VCC) | Positive supply | 5-V nominal supply; requires local 0.1-µF ceramic bypass capacitor to GND |
| 14 (CEBA) | B-to-A enable input | Active-low master control enabling B-to-A data flow path; must be low for B→A operation |
| 15–22 (B0–B7) | B-side I/O terminals | Bi-directional: serve as B-to-A inputs or A-to-B outputs depending on CEBA/CEAB state |
| 23 (LEAB) | A-to-B latch-enable input | Active-low control that makes A-to-B latches transparent on low; stores data on low-to-high transition |
| 24 (OEAB) | A-to-B output-enable input | Active-low gate for A-to-B 3-state outputs; high = high-impedance, low = enabled |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 8-bit latched transceivers | Enables full-duplex bidirectional bus interfacing with separate timing control per direction |
| Edge-rate controlled outputs | Reduces switching noise and EMI by limiting dV/dt without sacrificing speed |
| Matched rise/fall times | Minimizes duty-cycle distortion in clock distribution and data strobe paths |
| Ioff partial-power-down protection | Prevents damaging current flow when VCC is off but A/B buses remain powered |
| TTL-compatible input thresholds | Guarantees reliable recognition of legacy TTL signals without level-shifting circuitry |
Applications
| Industrial PLC Backplane Interface | Legacy Bus Extender Module |
|---|---|
Use Scenario: Interfacing microcontroller local bus to isolated I/O modules over a 24-pin parallel backplane with shared address/data lines. IC Role / Device Role / Timing Role: Bidirectional latched transceiver managing time-multiplexed A/B data flow with independent LE and OE control per direction to prevent bus contention during read/write cycles. Use Value: 6.5-ns propagation delay and 64-mA drive ensure signal integrity across 30-cm backplane traces; Ioff prevents backfeed when I/O modules power down independently. | Use Scenario: Extending a vintage 8086-based ISA bus to add modern peripheral slots while maintaining strict timing compliance. IC Role / Device Role / Timing Role: Registered transceiver providing setup/hold margin for legacy CPU address latching and buffering high-capacitance expansion bus loads. Use Value: 2-ns setup time and matched edge rates meet ISA timing budgets; TTL-compatible VIH/VIL eliminates need for external level translators. |
| Automotive Body Control Unit | Test Equipment Digital I/O Card |
Use Scenario: Isolating MCU GPIO banks from high-noise actuator driver circuits in 12-V automotive environments with transient-suppressed 5-V logic rails. IC Role / Device Role / Timing Role: Direction-controlled data register buffering sensor feedback and command signals between isolated domains with independent enable sequencing. Use Value: –40°C to +85°C rating and 2000-V HBM ESD withstand capability ensure reliability in under-hood electronics; Ioff protects MCU during module replacement. | Use Scenario: Building modular digital pattern generators with programmable pin direction and latched stimulus output in automated test fixtures. IC Role / Device Role / Timing Role: Latched transceiver serving as configurable I/O port with deterministic capture timing via LEAB/LEBA and glitch-free output gating via OEAB/OEBA. Use Value: Separate latch and output enables allow precise synchronization of stimulus launch with system clocks; 32-mA source drive supports direct LED indicator driving without external drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal latched transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY74FCT543TQCT | Slower 8.5-ns max propagation delay; same drive strength and pinout | Suitable for cost-sensitive designs where timing margin is relaxed | Select when system clock rate ≤ 80 MHz and lower dynamic power is prioritized |
| SN74FCT543ATQCT | Identical electrical specs and pinout; TI-branded variant of same silicon | No functional difference; branding and traceability differ per OEM requirements | Choose for TI-designated BOMs requiring TI part numbering instead of Cypress/Spansion legacy marking |
Compared with CY74FCT543TQCT, the CY74FCT543ATQCT delivers tighter timing for higher-speed bus arbitration; versus SN74FCT543ATQCT, it offers identical performance but with Cypress-origin traceability and documentation lineage - critical for legacy system maintenance and obsolescence management.
Availability
CY74FCT543ATQCT is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control units, legacy bus extenders, test equipment I/O cards, and embedded communication interfaces requiring stable component supply and long-term lifecycle support.
Supply support for CY74FCT543ATQCT 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 CY74FCT543ATQCT belongs to TI's legacy FCT logic family, engineered for high-speed, low-noise, TTL-compatible bus interface applications in industrial control and instrumentation systems.
FAQ
What is the maximum operating frequency supported by the CY74FCT543ATQCT?
The CY74FCT543ATQCT does not specify a maximum clock frequency directly, but its 6.5-ns maximum propagation delay (tPLH/tPHL) and 2-ns setup time (tsu) enable reliable operation in bus systems with cycle times ≥13 ns - corresponding to effective data rates up to ~77 MHz in synchronous latch-controlled configurations. Actual system frequency depends on board layout, load capacitance, and control signal timing margins.
Does the CY74FCT543ATQCT support hot-swap or partial-power-down operation?
Yes, the CY74FCT543ATQCT supports partial-power-down operation via its Ioff feature. When VCC = 0 V, the Ioff circuitry disables all outputs, limiting leakage current to ±1 µA even if A or B bus lines are held at valid logic levels. This prevents damaging current backflow and allows safe insertion or removal in live backplane or modular systems - a key requirement for industrial hot-swap architectures.
What is the pin compatibility status between CY74FCT543ATQCT and CY74FCT543TQCT?
The CY74FCT543ATQCT and CY74FCT543TQCT share identical SSOP-24 (DBQ) pinout, electrical interface, and functional block diagram. They differ only in AC timing specifications: CY74FCT543ATQCT has 6.5-ns max propagation delay, while CY74FCT543TQCT is rated at 8.5 ns. Both are functionally interchangeable in layouts designed for the SSOP-24 footprint, though timing-critical designs must verify setup/hold margins with the slower variant.
Can the CY74FCT543ATQCT drive standard TTL loads directly?
Yes, the CY74FCT543ATQCT is fully compatible with standard TTL logic levels. Its VIH (2.0 V min) and VIL (0.8 V max) thresholds match TTL input requirements, and its 64-mA sink / 32-mA source drive strength exceeds the 16-mA sink / 0.4-mA source needed for TTL fan-out of 10. No level-shifting circuitry is required when interfacing with 74LS, 74ALS, or other standard TTL devices.
What package variants are available for the CY74FCT543ATQCT besides SSOP-24?
The CY74FCT543ATQCT is exclusively offered in the SSOP-24 (DBQ) package per TI's official ordering information. Alternate speed grades like CY74FCT543TQCT and CY74FCT543CTQCT share the same DBQ package, while SOIC-24 variants (e.g., CY74FCT543ATSOCT) exist for the same speed grade but use the DW package. No CDIP, LCCC, or QFP variants are listed for the 'A' speed grade - only SSOP and SOIC options.
CY74FCT543ATQCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-SSOP
CY74FCT543ATQCT FAQ
1.How can I place an order for CY74FCT543ATQCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT543ATQCT 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 CY74FCT543ATQCT reliable?
The price and inventory of CY74FCT543ATQCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT543ATQCT is usually 5 days.
3.What payment methods are accepted for CY74FCT543ATQCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT543ATQCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT543ATQCT?
CY74FCT543ATQCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT543ATQCT 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 CY74FCT543ATQCT?
For technical support, including CY74FCT543ATQCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT543ATQCT requirements.
6.How does Aetrix verify that CY74FCT543ATQCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT543ATQCT 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 CY74FCT543ATQCT meets industry standards.
7.What is the process for return or replacement of CY74FCT543ATQCT?
All CY74FCT543ATQCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT543ATQCT, 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 CY74FCT543ATQCT part is unused and in its original packaging.
Return procedure for CY74FCT543ATQCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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