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Texas Instruments 74FCT2543CTSOCTE4
- Part No.:
- 74FCT2543CTSOCTE4
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74FCT2543CTSOCTE4.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,014
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Product details
Overview
74FCT2543CTSOCTE4 from Texas Instruments is an octal latched transceiver with independent A-to-B and B-to-A data paths, 3-state outputs, edge-rate control, 25-Ω on-die series termination resistors, and Ioff support for partial-power-down operation. It operates at 5 V (4.75–5.25 V), delivers ±15 mA drive strength, and achieves 5.5 ns max propagation delay in the C-speed grade. It is used in bidirectional bus isolation and level translation between TTL-compatible subsystems.
For engineers reviewing the 74FCT2543CTSOCTE4 datasheet, 74FCT2543CTSOCTE4 pinout, 74FCT2543CTSOCTE4 application, or 74FCT2543CTSOCTE4 equivalent, key selection criteria include latch-enable timing (tsu/th = 2 ns), output enable/disable times (tPZH/tPLZ = 6.5 ns), Ioff leakage (<±1 µA), VOH/VOL compatibility with TTL (3.3 V/0.55 V), and SOIC-24 package thermal resistance (46 °C/W).
Technical Context
This device implements two independent 8-bit latch banks - 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) inputs. Directional control is managed via active-low CEAB and CEBA enables, allowing simultaneous or asymmetric bidirectional operation.
It integrates edge-rate control circuitry to suppress transmission-line reflections and includes 25-Ω series output resistors per pin. The Ioff feature disables outputs when VCC = 0 V, preventing backflow current during partial power-down, and it maintains full TTL input/output voltage compatibility across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75 V to 5.25 V - ensures stable operation under industrial rail tolerances without external regulation. |
| Propagation Delay (tPLH/tPHL) | 2.5 ns (min) to 5.5 ns (max) - enables high-speed bidirectional bus transfer up to ~180 MHz effective clock rate. |
| Output Drive | –15 mA source / +12 mA sink - drives standard TTL loads with margin and supports stub-loaded backplanes. |
| VOH/VOL | 3.3 V (typ) / 0.55 V (max) at 5 V - guarantees TTL-compatible logic levels with noise margin >0.7 V. |
| Ioff Leakage | ±1 µA at VCC = 0 V - prevents damaging current flow during hot-insertion or mixed-voltage power sequencing. |
| Input Hysteresis | 0.2 V - improves noise immunity on control lines (LE, OE, CE) in electrically noisy environments. |
| ESD Rating | 2000-V HBM, 200-V MM, 1000-V CDM - exceeds JEDEC JESD22 requirements for robust board-level handling. |
Pinout & Package
74FCT2543CTSOCTE4 is housed in a 24-pin SOIC (DW) package with 0.300-inch body width, 1.27 mm pitch, and RoHS-compliant NiPdAu lead finish. Thermal resistance θJA is 46 °C/W, supporting continuous operation at up to 85°C ambient with moderate PCB copper area.
| 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 with TTL-compatible thresholds. |
| 9, 10, 11, 12, 13, 14, 15, 16 | B0–B7 | B-side data inputs (or A-to-B 3-state outputs) - symmetric counterpart to A pins with matched timing. |
| 17 | CEAB | A-to-B chip-enable (active low) - must be low to activate A-to-B latching or output driving. |
| 18 | GND | Ground reference - shared return for all I/O and internal logic; requires low-inductance connection. |
| 19 | VCC | 5 V supply - decoupling capacitor (0.1 µF ceramic) required within 1 cm of this pin. |
| 20 | CEBA | B-to-A chip-enable (active low) - enables B-to-A data path independently of CEAB. |
| 21, 22 | LEBA, LEAB | Latch-enable controls - low-to-high transition captures data; transparent when low. |
| 23, 24 | OEBA, OEAB | Output-enable controls - active low; places corresponding B or A outputs in high-impedance state. |
Key Features
| Feature | Design Value |
|---|---|
| On-die 25-Ω series termination | Reduces signal reflections on PCB traces up to 15 cm without external resistors, lowering EMI and improving signal integrity. |
| Edge-rate control circuitry | Slows output slew rate intentionally to limit dI/dt-induced noise, enabling cleaner switching in dense layouts. |
| Matched rise/fall times | Ensures symmetrical waveform edges (tr ≈ tf), minimizing duty-cycle distortion in clock-forwarding applications. |
| Back-to-back latch architecture | Allows concurrent capture and hold of A→B and B→A data, supporting full-duplex handshake protocols without external registers. |
| TTL-compatible I/O levels | Accepts 0.8 V/2.0 V input thresholds and delivers 3.3 V/0.55 V output levels - interoperable with legacy 74LS/74ALS systems. |
Applications
| PCI Bus Isolation | Industrial Backplane Interface |
|---|---|
|
Use Scenario: Isolating PCI slot data lines from motherboard logic to prevent ground loops and fault propagation. IC Role / Device Role / Timing Role: Bidirectional latched transceiver managing D[31:0] data flow with independent direction control per byte lane. Use Value: Ioff prevents backfeed during hot-swap events; 5.5 ns propagation delay meets PCI 2.1 timing budgets for 33 MHz operation. |
Use Scenario: Interfacing modular I/O cards to a central controller over a 24-bit parallel backplane with stubbed routing. IC Role / Device Role / Timing Role: Level-translating and noise-suppressing transceiver buffering address/data between mismatched voltage domains. Use Value: On-die 25-Ω resistors eliminate 48 external terminators; edge-rate control reduces crosstalk in 10+ card stacks. |
| Legacy System Upgrade Bridge | TTL-to-5 V CMOS Bus Extender |
|
Use Scenario: Connecting vintage 74LS-based instrumentation to modern microcontroller-based data loggers. IC Role / Device Role / Timing Role: Latched interface preserving data coherency during asynchronous handshaking between dissimilar clock domains. Use Value: TTL-compatible VIH/VIL and VOH/VOL ensure plug-and-play integration; latch enables replace external 74HC573 logic. |
Use Scenario: Extending a short-reach 5 V CMOS bus across a 20 cm PCB section with multiple load points. IC Role / Device Role / Timing Role: Active bus driver with controlled edge rates and 3-state capability for multi-drop arbitration. Use Value: Matched tr/tf prevents skew-induced setup violations; 12 mA sink supports 10 LS-TTL loads per line. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar latched transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74FCT2543ATSOCT | Slower 6.5 ns max propagation delay; identical pinout, Ioff, and voltage specs. | Suitable where timing margin allows relaxed speed grade; lower dynamic power at same frequency. | Select when system clock < 120 MHz and thermal budget is constrained. |
| SN74FCT2543CTSO | Same speed grade (5.5 ns) but obsolete TI marking; functionally identical to CY74FCT2543CTSOC. | No functional difference; only packaging and traceability distinction (TI vs Cypress legacy branding). | Prefer CY74FCT2543CTSOCTE4 for guaranteed new-production sourcing and TI's current quality assurance. |
Compared with 74FCT2543ATSOCT, the 74FCT2543CTSOCTE4 offers tighter timing for higher-frequency bus designs; compared with SN74FCT2543CTSO, it provides documented production continuity, updated MSL-1 packaging, and TI's current lifecycle support.
Availability
74FCT2543CTSOCTE4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system upgrades, and PCI-compliant peripheral isolation requiring stable component supply, long-term obsolescence management, and RoHS-compliant manufacturing.
Supply support for 74FCT2543CTSOCTE4 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 experience in high-reliability industrial and automotive-grade components.
The CY74FCT2543T family was designed for noise-sensitive, high-density digital systems requiring bidirectional bus isolation, partial-power-down resilience, and seamless TTL interoperability - especially in test equipment, telecom infrastructure, and industrial control.
FAQ
What is the maximum operating temperature range for the 74FCT2543CTSOCTE4?
The 74FCT2543CTSOCTE4 is rated for continuous operation from –40°C to +85°C ambient. This range is validated per JEDEC JESD78 and supported by thermal characterization (θJA = 46 °C/W). At 85°C, derating applies above 70% of full IOL/IOH load; full 12 mA/–15 mA drive is guaranteed only up to 70°C unless heatsinking is added.
Does the 74FCT2543CTSOCTE4 support true bidirectional data flow without external logic?
Yes, the 74FCT2543CTSOCTE4 supports fully independent bidirectional operation using its dual latch-enable (LEAB/LEBA) and output-enable (OEAB/OEBA) controls. With CEAB and CEBA both asserted low, A-to-B and B-to-A paths operate simultaneously - no external gates or timing logic are needed to coordinate directionality or data capture.
Can the 74FCT2543CTSOCTE4 replace the 74FCT543T in an existing design?
Yes - the 74FCT2543CTSOCTE4 is functionally and pin-compatible with the 74FCT543T, offering identical pinout, timing, and electrical behavior. Its added edge-rate control and on-die termination provide improved noise performance without layout changes, making it a direct drop-in upgrade for noise reduction in legacy systems.
What is the purpose of the Ioff feature in the 74FCT2543CTSOCTE4?
The Ioff feature in the 74FCT2543CTSOCTE4 disables all outputs when VCC = 0 V, limiting leakage current to ±1 µA. This prevents reverse current flow from live buses into a powered-down section - critical for hot-swap compliance, mixed-voltage domain isolation, and safe power sequencing in modular systems.
How does the 25-Ω series output resistor in the 74FCT2543CTSOCTE4 improve signal integrity?
The integrated 25-Ω series resistor in each output of the 74FCT2543CTSOCTE4 matches typical PCB trace impedance (50–75 Ω) in source-series termination configurations. This dampens reflections at the driver end, reducing ringing and overshoot on traces up to 15 cm - eliminating 48 discrete resistors and saving board space while improving EMI performance.
74FCT2543CTSOCTE4 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
74FCT2543CTSOCTE4 FAQ
1.How can I place an order for 74FCT2543CTSOCTE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74FCT2543CTSOCTE4 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 74FCT2543CTSOCTE4 reliable?
The price and inventory of 74FCT2543CTSOCTE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74FCT2543CTSOCTE4 is usually 5 days.
3.What payment methods are accepted for 74FCT2543CTSOCTE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74FCT2543CTSOCTE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74FCT2543CTSOCTE4?
74FCT2543CTSOCTE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74FCT2543CTSOCTE4 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 74FCT2543CTSOCTE4?
For technical support, including 74FCT2543CTSOCTE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74FCT2543CTSOCTE4 requirements.
6.How does Aetrix verify that 74FCT2543CTSOCTE4 is sourced from the original manufacturer or authorized distributors?
All 74FCT2543CTSOCTE4 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 74FCT2543CTSOCTE4 meets industry standards.
7.What is the process for return or replacement of 74FCT2543CTSOCTE4?
All 74FCT2543CTSOCTE4 units undergo pre-shipment inspection (PSI). If there is an issue with 74FCT2543CTSOCTE4, 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 74FCT2543CTSOCTE4 part is unused and in its original packaging.
Return procedure for 74FCT2543CTSOCTE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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