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Texas Instruments 74FCT2543CTSOCTG4
- Part No.:
- 74FCT2543CTSOCTG4
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74FCT2543CTSOCTG4.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 24SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
74FCT2543CTSOCTG4 from Texas Instruments is an octal latched transceiver with 3-state outputs, designed for bidirectional data flow control in TTL-compatible bus systems. It features dual independent latch-enable (LEAB/LEBA) and output-enable (OEAB/OEBA) controls, 25-Ω on-chip series termination resistors, Ioff support for partial-power-down operation, and 5.3 ns typical propagation delay. It is used in industrial backplane interfaces requiring noise-immune, latch-synchronized data transfer.
For engineers reviewing the 74FCT2543CTSOCTG4 datasheet, 74FCT2543CTSOCTG4 pinout, 74FCT2543CTSOCTG4 application, or 74FCT2543CTSOCTG4 equivalent, key selection criteria include bidirectional latch timing (tsu/th = 2 ns), 3.3 V typical VOH, ±1 µA Ioff at VCC = 0 V, and SOIC-24 package compatibility with legacy FCT logic families.
Technical Context
This device implements two independent sets of eight D-type latches with separate A-to-B and B-to-A control paths-each with dedicated CE, LE, and OE inputs-enabling concurrent or isolated bidirectional data storage and routing. Its edge-rate control circuitry and integrated 25-Ω series output resistors suppress transmission-line reflections without external components.
The 74FCT2543CTSOCTG4 operates over –40°C to +85°C with VCC = 4.75–5.25 V, supports TTL-level inputs and outputs, and features matched rise/fall times plus JESD22-compliant ESD protection (2000-V HBM). Its Ioff specification ensures safe backflow prevention during partial power-down.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.75 V to 5.25 V - Ensures stable operation across industrial-grade 5 V supply tolerances. |
| tPD (max) | 5.5 ns - Enables high-speed bus interfacing up to ~180 MHz effective data rate in latch-controlled systems. |
| IOL/IOH | 12 mA sink / –15 mA source - Drives standard TTL loads directly without external buffers. |
| VOH (typ) | 3.3 V at IOH = –15 mA - Provides margin for interfacing with 3.3 V logic while maintaining 5 V system compatibility. |
| Rout (series) | 25 Ω - On-die termination reduces signal overshoot/ringing on PCB traces ≥2 inch. |
| Ioff | ±1 µA at VCC = 0 V - Prevents damaging current flow when powered down in mixed-voltage subsystems. |
| tsu/th | 2 ns each - Tight setup/hold enables reliable latching from fast microcontroller GPIO or FPGA I/O. |
Pinout & Package
74FCT2543CTSOCTG4 is housed in a 24-pin SOIC (DW) package with 0.300-inch body width and standard JEDEC MS-013 footprint. Pin 1 is located at top-left corner (quadrant Q1) per tape-and-reel orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (LEBA) | B-to-A latch enable (active low) | Controls transparency/storage mode for B→A latches; low-to-high transition captures B inputs. |
| 2 (OEBA) | B-to-A output enable (active low) | Activates 3-state B outputs when low; high disables outputs to high-impedance state. |
| 3–10 (A0–A7) | A-side data I/O | Inputs for A→B flow; become 3-state outputs during B→A flow when CEBA active. |
| 11 (CEAB) | A-to-B enable (active low) | Enables A→B path; must be low for LEAB/OEAB to affect A→B operation. |
| 12 (GND) | Ground reference | Primary return path for all logic and I/O currents; requires low-inductance connection. |
| 13 (VCC) | Power supply | 5 V nominal supply; decoupling capacitor (0.1 µF) required within 10 mm of this pin. |
| 14 (CEBA) | B-to-A enable (active low) | Enables B→A path; must be low for LEBA/OEBA to affect B→A operation. |
| 15–22 (B0–B7) | B-side data I/O | Inputs for B→A flow; become 3-state outputs during A→B flow when CEAB active. |
| 23 (LEAB) | A-to-B latch enable (active low) | Controls transparency/storage mode for A→B latches; low-to-high transition captures A inputs. |
| 24 (OEAB) | A-to-B output enable (active low) | Activates 3-state A outputs when low; high disables outputs to high-impedance state. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent latch paths | Separate CE/LE/OE controls per direction allow asynchronous A↔B data staging without contention. |
| On-die 25-Ω series termination | Eliminates need for external series resistors on each output, reducing BOM count and PCB area. |
| Ioff partial-power-down support | Prevents reverse current flow when VCC = 0 V, enabling hot-swap and power-gating in modular systems. |
| TTL-compatible input thresholds | VIL ≤ 0.8 V and VIH ≥ 2.0 V ensure robust interfacing with legacy 5 V microcontrollers and ASICs. |
| Matched tr/tf and low skew | Reduces differential noise in parallel buses and improves eye diagram integrity at 50+ Mbps. |
Applications
| Industrial Backplane Interface | Legacy System Bus Extender |
|---|---|
|
Use Scenario: Interfacing a modern FPGA-based controller to a legacy 8-bit ISA-style backplane with strict noise and timing requirements. IC Role / Device Role / Timing Role: Bidirectional latch synchronizer that isolates FPGA I/O from noisy backplane signals while preserving data coherency across clock domains. Use Value: On-chip 25-Ω termination and 2 ns setup/hold eliminate external RC networks and reduce layout sensitivity to trace length mismatches. |
Use Scenario: Adding memory-mapped peripheral slots to a vintage 80C88-based embedded controller without modifying existing bus timing. IC Role / Device Role / Timing Role: Level-shifting and latched transceiver providing TTL-compatible drive strength and precise edge alignment for address/data strobes. Use Value: 5.3 ns max propagation delay and 3.3 V VOH maintain signal integrity across long backplane traces while staying within ISA timing budgets. |
| Modular PLC I/O Module | Test Equipment Data Capture |
|
Use Scenario: Isolating field I/O signals from a central CPU module in a DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Direction-controlled data buffer with independent enable/latch for synchronized acquisition of analog/digital sensor inputs. Use Value: Ioff support allows safe power cycling of I/O modules while main CPU remains active, preventing bus contention during hot-swap. |
Use Scenario: Capturing parallel digital waveforms from DUTs in automated test equipment with deterministic sampling windows. IC Role / Device Role / Timing Role: High-fidelity latch capturing simultaneous 8-bit data on a precise trigger edge, then holding for serial readout. Use Value: Back-to-back latches and matched rise/fall times ensure <100 ps inter-bit skew, critical for accurate timing analysis of high-speed digital signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal latched transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY74FCT2543CTQCT | SSOP-24 package (DBQ); identical electrical specs and timing; same speed grade (5.3 ns). | Requires PCB redesign for smaller pitch (0.64 mm vs SOIC's 1.27 mm); better for space-constrained boards. | Select when board real estate is limited and reflow profile supports Level-2 MSL handling. |
| SN74FCT543CTSOCT | No on-die series termination; higher output drive (24 mA sink); no Ioff support. | Lacks partial-power-down capability and reflection suppression; suited for short-trace, low-noise environments only. | Choose only if legacy design already uses SN74FCT543 and noise margins are verified sufficient. |
Compared with CY74FCT2543CTQCT, the 74FCT2543CTSOCTG4 offers identical logic functionality but in a more manufacturable SOIC package; versus SN74FCT543CTSOCT, it adds critical noise suppression and power-down safety for modern industrial deployments.
Availability
74FCT2543CTSOCTG4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy bus extenders, modular PLC I/O modules, and test equipment data capture systems requiring stable component supply and long-term lifecycle assurance.
Supply support for 74FCT2543CTSOCTG4 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 heritage in industry-standard logic families.
The 74FCT2543CTSOCTG4 belongs to TI's FCT logic family-designed specifically for noise-critical, high-density 5 V systems requiring TTL compatibility, low power, and robust signal integrity.
FAQ
What is the maximum operating temperature range for the 74FCT2543CTSOCTG4?
The 74FCT2543CTSOCTG4 is rated for continuous operation from –40°C to +85°C ambient temperature. This range is validated per TI's recommended operating conditions and applies to both SOIC packaging and all specified electrical parameters including propagation delay, output drive, and Ioff performance. Operation outside this range may result in parametric degradation or functional failure.
Does the 74FCT2543CTSOCTG4 support hot-swap or partial-power-down operation?
Yes, the 74FCT2543CTSOCTG4 includes Ioff circuitry that actively disables outputs when VCC = 0 V, limiting reverse current to ±1 µA. This feature enables safe insertion/removal in live backplanes and supports power-gated subsystems where the 74FCT2543CTSOCTG4 remains unpowered while adjacent logic remains active.
How does the on-chip 25-Ω series termination in the 74FCT2543CTSOCTG4 improve signal integrity?
The 74FCT2543CTSOCTG4 integrates 25-Ω series resistors at each output to match typical PCB trace impedance (50–75 Ω), significantly reducing signal reflections and ringing. This eliminates the need for discrete 22–33 Ω resistors per line, lowering BOM cost and improving timing margin on traces longer than 2 inches-especially critical in industrial backplane applications.
Can the 74FCT2543CTSOCTG4 replace the SN74FCT543CTSOCT in an existing design?
Yes-the 74FCT2543CTSOCTG4 is functionally and pin-compatible with SN74FCT543CTSOCT, but adds 25-Ω series termination and Ioff support. No PCB changes are required; however, users should verify noise reduction benefits and confirm that the slightly lower VOH (3.3 V vs 3.5 V typical) meets downstream receiver thresholds.
What are the latch timing requirements for reliable operation of the 74FCT2543CTSOCTG4?
The 74FCT2543CTSOCTG4 requires 2 ns minimum setup (tsu) and hold (th) time for data inputs relative to the LEAB or LEBA low-to-high transition. These values are guaranteed across –40°C to +85°C and VCC = 4.75–5.25 V. Violating either spec risks metastability or incorrect latched data, especially in high-speed microcontroller or FPGA-driven systems.
74FCT2543CTSOCTG4 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:
- 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-SOIC
74FCT2543CTSOCTG4 FAQ
1.How can I place an order for 74FCT2543CTSOCTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74FCT2543CTSOCTG4 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 74FCT2543CTSOCTG4 reliable?
The price and inventory of 74FCT2543CTSOCTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74FCT2543CTSOCTG4 is usually 5 days.
3.What payment methods are accepted for 74FCT2543CTSOCTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74FCT2543CTSOCTG4 transactions.
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4.How is shipping managed for 74FCT2543CTSOCTG4?
74FCT2543CTSOCTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74FCT2543CTSOCTG4 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 74FCT2543CTSOCTG4?
For technical support, including 74FCT2543CTSOCTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74FCT2543CTSOCTG4 requirements.
6.How does Aetrix verify that 74FCT2543CTSOCTG4 is sourced from the original manufacturer or authorized distributors?
All 74FCT2543CTSOCTG4 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 74FCT2543CTSOCTG4 meets industry standards.
7.What is the process for return or replacement of 74FCT2543CTSOCTG4?
All 74FCT2543CTSOCTG4 units undergo pre-shipment inspection (PSI). If there is an issue with 74FCT2543CTSOCTG4, 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 74FCT2543CTSOCTG4 part is unused and in its original packaging.
Return procedure for 74FCT2543CTSOCTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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