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Texas Instruments CY74FCT543TSOCT
- Part No.:
- CY74FCT543TSOCT
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT543TSOCT.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:939
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Product details
Overview
CY74FCT543TSOCT from Texas Instruments is an 8-bit latched registered transceiver with independent A↔B bidirectional data flow control, 3-state outputs, Ioff partial-power-down support, and 64-mA sink / 32-mA source drive capability. It operates at 4.75–5.25 V over –40°C to 85°C and is used in bus interface logic for industrial backplanes and legacy TTL-compatible system interconnects.
For engineers reviewing the CY74FCT543TSOCT datasheet, CY74FCT543TSOCT pinout, CY74FCT543TSOCT application, or CY74FCT543TSOCT equivalent, key selection considerations include latch-enable timing (tsu = 2 ns), propagation delay (tPLH/tPHL ≤ 8.5 ns), output drive strength, Ioff-enabled power sequencing, and SOIC-24 package compatibility with legacy board layouts.
Technical Context
The CY74FCT543TSOCT implements dual 8-bit D-type latch banks-one for A-to-B and one for B-to-A data paths-each with separate LEAB/LEBA latch-enable and OEAB/OEBA output-enable inputs. Control is fully asynchronous and level-sensitive, with CEAB/CEBA enabling data capture directionality.
It features edge-rate controlled outputs to suppress switching noise, matched rise/fall times for clean signal integrity, and Ioff circuitry that disables outputs and blocks reverse current when VCC = 0 V-enabling safe hot-insertion and partial-power-down operation in mixed-supply systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75–5.25 V - Ensures robust TTL-level compatibility and stable operation across industrial voltage tolerances. |
| Output Drive | 64 mA sink / 32 mA source - Supports heavy capacitive loads and fanout to multiple TTL inputs without external buffers. |
| Propagation Delay | ≤8.5 ns (A↔B) - Enables reliable high-speed bus handshaking in 20-MHz-class synchronous systems. |
| Setup Time (tsu) | 2 ns before LEAB↓ - Allows tight timing integration with fast microcontroller or FPGA control signals. |
| Ioff Current | ±1 µA at VCC = 0 V - Prevents backfeed damage during power sequencing or hot-swap events. |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - Meets stringent industrial handling and assembly requirements. |
| Operating Temp | –40°C to +85°C - Qualified for extended industrial ambient environments without derating. |
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, 2, 3, 4, 5, 6, 7, 8 (A0–A7) | A-side data I/O | Input to A latches when CEAB low; 3-state output to B bus when OEAB low and CEAB low. |
| 9, 10, 11, 12, 13, 14, 15, 16 (B0–B7) | B-side data I/O | Input to B latches when CEBA low; 3-state output to A bus when OEBA low and CEBA low. |
| 17 (LEBA) | B-to-A latch enable | Active-low; makes B latches transparent on low, stores on low→high transition. |
| 18 (OEBA) | B-to-A output enable | Active-low; enables B→A 3-state outputs only when CEBA is also low. |
| 19 (CEAB) | A-to-B enable | Active-low master control: must be low to capture A data or drive B outputs. |
| 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; bypassing with 0.1 µF ceramic near pin is mandatory for noise immunity. |
| 22 (CEBA) | B-to-A enable | Active-low master control: must be low to capture B data or drive A outputs. |
| 23 (LEAB) | A-to-B latch enable | Active-low; makes A latches transparent on low, stores on low→high transition. |
| 24 (OEAB) | A-to-B output enable | Active-low; enables A→B 3-state outputs only when CEAB is also low. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent latch banks | Enables simultaneous A→B and B→A data transfer with separate timing control-no bus turnaround delay required. |
| Ioff partial-power-down | Prevents damaging current flow between powered and unpowered system domains during power sequencing or fault conditions. |
| Edge-rate controlled outputs | Reduces EMI and ground bounce by limiting slew rate-critical for dense PCB layouts with shared return paths. |
| Matched rise/fall times | Minimizes duty-cycle distortion on clocked or strobed data buses, preserving timing margins in synchronous interfaces. |
| TTL-compatible input thresholds | VIL = 0.8 V, VIH = 2.0 V - Interoperates directly with legacy 74LS/74ALS logic without level-shifting. |
Applications
| Industrial Backplane Interface | Legacy System Bus Extension |
|---|---|
Use Scenario: Bidirectional data routing between CPU module and I/O expansion cards in modular PLC chassis with shared 8-bit data bus. IC Role / Device Role / Timing Role: Registered transceiver providing isolated A↔B latch control, enabling concurrent read/write arbitration without bus contention. Use Value: Eliminates need for discrete glue logic and timing buffers; supports deterministic 8.5-ns latency for real-time I/O scanning cycles. | Use Scenario: Extending a vintage 8086-based controller's address/data bus to add memory-mapped peripherals while maintaining full TTL compatibility. IC Role / Device Role / Timing Role: Latched transceiver acting as bidirectional bus repeater with CE/LE/OE decoupling-preserving original timing budgets. Use Value: Maintains 20-MHz bus operation without redesign; Ioff prevents backfeed when peripheral modules are hot-swapped. |
| Mixed-Voltage Subsystem Bridge | Test Equipment Data Capture |
Use Scenario: Isolating a 3.3-V FPGA control plane from a 5-V sensor acquisition subsystem using shared control/status lines. IC Role / Device Role / Timing Role: Direction-controlled level-tolerant interface with independent enable/latch control per data path. Use Value: Enables safe 5-V domain interfacing without external level shifters; Ioff protects FPGA I/O during 5-V subsystem power-up/down. | Use Scenario: Capturing parallel digital waveforms from DUT under test into high-speed logic analyzer front-end with precise strobe alignment. IC Role / Device Role / Timing Role: Registered latch capturing synchronized 8-bit samples on LEAB/LEBA edges, holding data for serial readout. Use Value: Provides 2-ns setup margin for sampling strobes; 64-mA drive ensures clean signal integrity into analyzer input termination. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal latched transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74FCT543ATSOCT | Same SOIC-24 footprint and pinout; 6.5-ns max propagation delay (vs. 8.5 ns); 48-mA sink / 12-mA source drive. | Lower drive strength limits fanout in high-capacitance bus environments; faster timing suits tighter control loops. | Select when lower power and faster timing outweigh drive requirement; verify load capacitance < 30 pF. |
| 74ACT543SCX | ACT-family CMOS; 4.5–5.5 V supply; 24-mA sink/source; no Ioff; higher input leakage (±10 µA vs. ±1 µA). | Lacks Ioff protection-unsuitable for partial-power-down or hot-swap; higher noise immunity but less TTL-compatible VIH/VIL. | Choose only in fully powered, single-domain systems where Ioff is unnecessary and ACT speed/power trade-off is acceptable. |
Compared with SN74FCT543ATSOCT and 74ACT543SCX, the CY74FCT543TSOCT delivers superior drive strength and guaranteed Ioff safety for industrial power sequencing, at the cost of slightly relaxed timing-making it optimal for ruggedized, mixed-supply backplane designs.
Availability
CY74FCT543TSOCT is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus extensions, mixed-voltage subsystem bridges, and test equipment data capture requiring stable component supply and long-term manufacturability.
Supply support for CY74FCT543TSOCT 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 with emphasis on reliability, longevity, and industrial-grade qualification.
The CY74FCT543TSOCT belongs to TI's FCT logic family-designed specifically for high-noise industrial environments requiring TTL compatibility, robust ESD tolerance, and safe partial-power-down operation.
FAQ
What is the maximum operating temperature range for the CY74FCT543TSOCT?
The CY74FCT543TSOCT is rated for operation from –40°C to +85°C ambient temperature. This industrial-grade range is validated per TI's recommended operating conditions and supported by thermal characterization (θJA = 46°C/W for SOIC package). The device maintains full electrical specifications-including 64-mA sink drive and 2-ns setup time-across this entire range without derating.
Does the CY74FCT543TSOCT support hot-swap or partial-power-down operation?
Yes, the CY74FCT543TSOCT includes Ioff circuitry that actively disables outputs and limits reverse current to ±1 µA when VCC = 0 V. This feature enables safe hot-insertion into live backplanes and supports controlled power sequencing in multi-rail systems-verified per TI's production test and absolute maximum ratings (JESD 78 Class II compliance).
What are the key timing parameters for latch operation in the CY74FCT543TSOCT?
The CY74FCT543TSOCT requires a minimum 2-ns setup time (tsu) for data before the LEAB or LEBA low-to-high transition, and a 2-ns hold time (th) after that transition. Pulse width on LEAB/LEBA must be ≥5 ns. Propagation delays from latch input to output are ≤8.5 ns (tPLH/tPHL), ensuring deterministic timing in 20-MHz bus systems.
Can the CY74FCT543TSOCT interface directly with standard TTL logic?
Yes, the CY74FCT543TSOCT is fully compatible with TTL input and output logic levels: VIH = 2.0 V min, VIL = 0.8 V max, VOH = 2.4 V min (at –32 mA), VOL = 0.55 V max (at 64 mA). Its reduced VOH (typ. 3.3 V) and edge-rate control ensure interoperability without level shifters-even with legacy 74LS devices.
What package type and marking does the CY74FCT543TSOCT use?
The CY74FCT543TSOCT uses a SOIC-24 (DW) package with 1.27-mm pitch, 7.5-mm width, and 15.4-mm length. It is supplied in tape-and-reel format (2000 units/reel) and marked "FCT543" on the top surface. RoHS-compliant NiPdAu lead finish and MSL Level-1 rating allow standard reflow without moisture sensitivity concerns.
CY74FCT543TSOCT 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:
- 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
CY74FCT543TSOCT FAQ
1.How can I place an order for CY74FCT543TSOCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT543TSOCT 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 CY74FCT543TSOCT reliable?
The price and inventory of CY74FCT543TSOCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT543TSOCT is usually 5 days.
3.What payment methods are accepted for CY74FCT543TSOCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT543TSOCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT543TSOCT?
CY74FCT543TSOCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT543TSOCT 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 CY74FCT543TSOCT?
For technical support, including CY74FCT543TSOCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT543TSOCT requirements.
6.How does Aetrix verify that CY74FCT543TSOCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT543TSOCT 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 CY74FCT543TSOCT meets industry standards.
7.What is the process for return or replacement of CY74FCT543TSOCT?
All CY74FCT543TSOCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT543TSOCT, 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 CY74FCT543TSOCT part is unused and in its original packaging.
Return procedure for CY74FCT543TSOCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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