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Texas Instruments CY74FCT2543TQCTE4
- Part No.:
- CY74FCT2543TQCTE4
- Manufacturer:
- Texas Instruments
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
CY74FCT2543TQCTE4.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,314
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Product details
Overview
CY74FCT2543TQCTE4 from Texas Instruments is an octal latched transceiver with independent A-to-B and B-to-A data paths, 3-state outputs, Ioff partial-power-down support, 25-Ω on-chip series output resistors, and 5.25 V absolute maximum supply rating. It operates across –40°C to +85°C and delivers 12 mA sink / 15 mA source drive at 5 V, enabling bidirectional bus interfacing in industrial control backplanes.
For engineers reviewing the CY74FCT2543TQCTE4 datasheet, CY74FCT2543TQCTE4 pinout, CY74FCT2543TQCTE4 application, or CY74FCT2543TQCTE4 equivalent, key selection criteria include latch-enable timing (2 ns setup/hold), propagation delay (2.5–8.5 ns), 3-state enable/disable times (2–12 ns), and compatibility with TTL-level inputs and FCT-family logic systems.
Technical Context
The CY74FCT2543TQCTE4 implements dual independent 8-bit latch paths - one for A-to-B and one for B-to-A data flow - each controlled by dedicated latch-enable (LEAB/LEBA) and output-enable (OEAB/OEBA) signals. Its edge-rate control circuitry and integrated 25-Ω series resistors suppress transmission-line reflections without external termination.
It supports partial-power-down via Ioff, disabling outputs when VCC = 0 V to prevent backflow current, and features matched rise/fall times plus hysteresis (0.2 V) for noise immunity. All inputs tolerate 7 V, and outputs are fully TTL-compatible with VOH ≈ 3.3 V (typ) and VOL ≤ 0.55 V (max) at 12 mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75–5.25 V - ensures stable operation within standard 5 V ±5% industrial rail tolerance |
| Propagation Delay | 2.5–8.5 ns - enables high-speed bidirectional bus transfer up to ~100 MHz system clock domains |
| Output Drive | 12 mA sink / 15 mA source - sufficient to drive multiple TTL loads or terminated transmission lines |
| Ioff Current | ±1 µA at VCC = 0 V - prevents damaging back-current during hot-swap or partial power-down sequences |
| Input Hysteresis | 0.2 V - improves noise margin against ground bounce or crosstalk in dense PCB layouts |
| Series Output Resistor | 25 Ω (typ) - reduces signal overshoot/ringing on PCB traces without discrete termination components |
| ESD Rating | 2000-V HBM - meets industrial-grade robustness requirements for handling and board assembly |
Pinout & Package
Package: 24-pin QSOP (SSOP-DBQ), 0.154" body width, 0.025" pitch, RoHS-compliant NIPDAU finish, MSL Level-2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 A0–A7 | A-side data I/O | Bi-directional terminals: inputs when CEAB low & OEAB low; high-Z outputs when OEAB high or CEAB high |
| 9, 10, 11, 12, 13, 14, 15, 16 B0–B7 | B-side data I/O | Bi-directional terminals: inputs when CEBA low & OEBA low; high-Z outputs when OEBA high or CEBA high |
| 17, 22 LEAB, LEBA | Latch-enable control | Active-low edge-triggered enables transparent latch mode on falling edge; stores data on subsequent rising edge |
| 18, 21 OEAB, OEBA | Output-enable control | Active-low 3-state enable: drives outputs when low; places outputs in high-impedance when high |
| 19, 20 CEAB, CEBA | Direction-enable control | Active-low enables respective A↔B path; disables latch and output buffers when high |
| 23, 24 GND, VCC | Power rails | Single 5 V supply domain; decoupling required near pin 24 for noise-sensitive high-speed switching |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual-latch architecture | Enables simultaneous A→B and B→A data transfers without bus contention or arbitration logic |
| On-chip 25-Ω series termination | Eliminates need for external series resistors on each output, reducing BOM count and layout area |
| Ioff partial-power-down protection | Allows safe insertion/removal in live backplane systems where VCC may be unpowered while other rails remain active |
| TTL-compatible input thresholds | Accepts standard 0.8 V/2.0 V VIH/VIL levels, enabling direct interface with legacy 74LS/74ALS logic families |
| Matched rise/fall times | Minimizes duty-cycle distortion on clocked or strobed data buses, preserving signal integrity in synchronous systems |
Applications
| Industrial Backplane Interface | Legacy System Bus Extension |
|---|---|
Use Scenario: Bidirectional data exchange between CPU module and I/O expansion cards in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Latched transceiver managing isolated A/B data lanes with independent direction control and 3-state isolation during arbitration. Use Value: Eliminates external bus buffers and direction-control logic, reducing component count and improving timing predictability via fixed 2.5–8.5 ns propagation window. | Use Scenario: Extending a vintage 8-bit ISA or STD bus to add modern peripheral modules while retaining original controller timing. IC Role / Device Role / Timing Role: Level-shifting and latching bridge between TTL-based host and CMOS-based add-on cards, with precise 2 ns setup/hold compliance. Use Value: Maintains full backward compatibility with legacy timing budgets while adding Ioff safety for hot-plug capability. |
| Automated Test Equipment (ATE) Fixture | Distributed Sensor Network Hub |
Use Scenario: Signal routing and conditioning between DUT interface board and main controller in modular ATE rack systems. IC Role / Device Role / Timing Role: Isolating test channel drivers from controller logic using 3-state outputs, with latch storage for synchronized stimulus capture. Use Value: Enables deterministic sampling windows and eliminates bus contention during parallel test execution across multiple DUTs. | Use Scenario: Aggregating sensor data from multiple RS-485 or CAN nodes onto a local microcontroller bus in factory-floor monitoring systems. IC Role / Device Role / Timing Role: Buffering and direction-controlled data staging between isolated sensor interfaces and shared MCU data bus. Use Value: Provides ESD-hardened (2000-V HBM), noise-immune (0.2 V hysteresis) interface with built-in line-matching to reduce reflection-induced errors. |
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 | No on-chip 25-Ω series resistors; higher VOH (3.5 V typ); no edge-rate control circuitry | Higher signal integrity risk on long traces; requires external termination for clean edges | Select only if cost sensitivity outweighs noise performance and layout simplicity needs |
| SN74FCT245AQDBR | Non-latched (transparent) transceiver; lacks separate LEAB/LEBA controls; no back-to-back latch storage | Suitable for continuous data streaming but not for sampled/stored bus handshaking protocols | Choose when real-time pass-through is required and latch functionality is unnecessary |
Compared with CY74FCT543TQCT and SN74FCT245AQDBR, the CY74FCT2543TQCTE4 uniquely combines latch storage, on-die termination, and Ioff - making it optimal for noise-critical, hot-swap-capable, and protocol-synchronized bus interfaces where data must be captured and held before forwarding.
Availability
CY74FCT2543TQCTE4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy bus extensions, automated test equipment fixtures, and distributed sensor network hubs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant SSOP packaging.
Supply support for CY74FCT2543TQCTE4 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 CY74FCT2543TQCTE4 belongs to TI's FCT logic family, engineered for high-speed, low-noise, TTL-compatible digital interfacing in mission-critical industrial and instrumentation systems.
FAQ
What is the maximum operating temperature range for CY74FCT2543TQCTE4?
The CY74FCT2543TQCTE4 is rated for continuous operation from –40°C to +85°C ambient temperature. This range is validated per TI's recommended operating conditions and supported by thermal impedance data (θJA = 61°C/W for QSOP package), making it suitable for enclosed industrial enclosures and non-temperature-controlled factory environments where the CY74FCT2543TQCTE4 serves as a bus interface component.
Does CY74FCT2543TQCTE4 support hot-swap or partial-power-down operation?
Yes, the CY74FCT2543TQCTE4 integrates Ioff circuitry that disables all outputs when VCC = 0 V, limiting reverse current to ±1 µA. This allows safe insertion into live backplanes or mixed-rail systems where other devices remain powered - a critical feature confirmed in the absolute maximum ratings and functional description of the CY74FCT2543TQCTE4 datasheet.
What is the purpose of the CEAB and CEBA pins on CY74FCT2543TQCTE4?
The CEAB (A-to-B Enable) and CEBA (B-to-A Enable) pins on CY74FCT2543TQCTE4 are active-low direction gate controls. When CEAB is low, the A-to-B latch and output buffers are enabled; when high, both are disabled into high-impedance storage. Similarly, CEBA governs the B-to-A path. This dual-enable architecture prevents bus contention and enables independent, asynchronous data flow control - a defining behavior of the CY74FCT2543TQCTE4.
Can CY74FCT2543TQCTE4 replace CY74FCT543TQCT in an existing design?
Yes, the CY74FCT2543TQCTE4 is functionally and pinout-compatible with CY74FCT543TQCT per TI's documentation, and explicitly cited as a drop-in noise-reduction upgrade. The CY74FCT2543TQCTE4 adds on-chip 25-Ω series resistors and edge-rate control, reducing transmission-line reflections without layout changes - making it a validated replacement for the CY74FCT543TQCT in noise-sensitive applications.
What are the timing requirements for latch-enable signals on CY74FCT2543TQCTE4?
The CY74FCT2543TQCTE4 requires a minimum 5 ns pulse width on LEAB or LEBA, with 2 ns setup and hold time relative to A/B data transitions. These values are specified under "timing requirements" in the datasheet and apply across the full –40°C to +85°C range. Violating these timing margins risks metastability or incomplete latch capture - critical parameters for reliable operation of the CY74FCT2543TQCTE4 in synchronous bus systems.
CY74FCT2543TQCTE4 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:
- Obsolete
- 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-SSOP
CY74FCT2543TQCTE4 FAQ
1.How can I place an order for CY74FCT2543TQCTE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT2543TQCTE4 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 CY74FCT2543TQCTE4 reliable?
The price and inventory of CY74FCT2543TQCTE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT2543TQCTE4 is usually 5 days.
3.What payment methods are accepted for CY74FCT2543TQCTE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT2543TQCTE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT2543TQCTE4?
CY74FCT2543TQCTE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT2543TQCTE4 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 CY74FCT2543TQCTE4?
For technical support, including CY74FCT2543TQCTE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT2543TQCTE4 requirements.
6.How does Aetrix verify that CY74FCT2543TQCTE4 is sourced from the original manufacturer or authorized distributors?
All CY74FCT2543TQCTE4 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 CY74FCT2543TQCTE4 meets industry standards.
7.What is the process for return or replacement of CY74FCT2543TQCTE4?
All CY74FCT2543TQCTE4 units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT2543TQCTE4, 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 CY74FCT2543TQCTE4 part is unused and in its original packaging.
Return procedure for CY74FCT2543TQCTE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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