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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

Texas Instruments CY74FCT2543TQCTG4

Name: CY74FCT2543TQCTG4
Brand: Texas Instruments
SKU: CY74FCT2543TQCTG4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CY74FCT2543TQCTG4

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 24-SSOP (0.154", 3.90mm Width)

Datasheet:: CY74FCT2543TQCTG4.pdf

Description:: IC TXRX NON-INVERT 5.25V 24SSOP

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Product details

Overview

CY74FCT2543TQCTG4 from Texas Instruments is an octal latched transceiver with dual 8-bit bidirectional data paths, 3-state outputs, independent A-to-B and B-to-A latch/enable controls, 25-Ω on-chip series output resistors, and I_off support for partial-power-down operation. It operates at 5 V (4.75–5.25 V), delivers ±15 mA drive strength, and achieves 8.5 ns max propagation delay in SSOP-24 package - used in legacy bus interface, backplane data routing, and industrial control I/O expansion.

For engineers reviewing the CY74FCT2543TQCTG4 datasheet, CY74FCT2543TQCTG4 pinout, CY74FCT2543TQCTG4 application, or CY74FCT2543TQCTG4 equivalent, key selection criteria include bidirectional latch timing (t_su/t_h = 2 ns), 3-state enable/disable times (t_PZH/t_PLZ ≤ 9 ns), VOH/VOL compatibility with TTL and 5-V CMOS, and I_off-enabled system-level power sequencing.

Technical Context

The CY74FCT2543TQCTG4 implements two independent sets of eight D-type latches with separate LEAB/LEBA (latch-enable) and OEAB/OEBA (output-enable) inputs, enabling asynchronous bidirectional data storage and flow control. Its edge-rate control circuitry and integrated 25-Ω series termination resistors suppress transmission-line reflections without external components.

It features fully TTL-compatible input thresholds (V_IL = 0.8 V, V_VIH = 2.0 V) and output levels (VOH = 2.4 V min at –15 mA, VOL = 0.55 V max at 12 mA), matched rise/fall times, and JESD22-certified ESD protection (2000-V HBM). The I_off circuit disables outputs when V_CC = 0 V, preventing backflow current during partial power-down.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4.75–5.25 V - ensures robust operation across industrial 5-V rail tolerances
Propagation Delay	8.5 ns max (A↔B) - supports 100+ MHz bus clocking with margin
Output Drive	±15 mA - drives standard TTL loads and short PCB traces directly
I_off Current	±1 µA at V_CC = 0 V - enables safe hot-insertion and power-gating
Input Thresholds	V_IL = 0.8 V, V_IH = 2.0 V - interoperable with legacy TTL and 5-V CMOS logic
On-Chip Termination	25 Ω series resistor per output - eliminates need for discrete series resistors on board
ESD Rating	2000-V HBM - meets industrial handling and assembly requirements

Pinout & Package

Package: SSOP-24 (DBQ), 0.154-inch body width, 0.025-inch 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 inputs (or B-to-A 3-state outputs)
9, 10, 11, 12, 13, 14, 15, 16	B0–B7	B-side data inputs (or A-to-B 3-state outputs)
17	CEAB	A-to-B direction enable (active low - must be low to activate A→B path)
18	GND	Ground reference for all logic and power domains
19	V_CC	5-V supply input - powers internal logic and output drivers
20	CEBA	B-to-A direction enable (active low - must be low to activate B→A path)
21, 22	LEBA, LEAB	Latch-enable inputs controlling storage mode entry for respective direction
23, 24	OEBA, OEAB	3-state output-enable inputs - disable B or A outputs into high-impedance state

Key Features

Feature	Design Value
Dual independent latch control	Separate LEAB/LEBA and OEAB/OEBA pins allow concurrent A→B and B→A data capture and output gating
Integrated 25-Ω series termination	Reduces signal reflection noise on PCB traces up to 10 cm without external resistors
I_off partial-power-down support	Prevents damaging back-current when V_CC is off but A/B buses remain live at up to 4.5 V
TTL-compatible voltage levels	Accepts standard TTL inputs and drives TTL loads directly - no level-shifting required
Matched rise/fall times	Minimizes duty-cycle distortion and jitter in clock-forwarding or strobed data applications

Applications

Industrial Backplane Interface	Legacy System Bus Expansion
Use Scenario: Interfacing microcontroller-based I/O modules to a 24-bit parallel backplane in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional latched transceiver managing isolated data transfer between CPU and peripheral cards with direction-controlled handshaking. Use Value: Independent CEAB/CEBA and LEAB/LEBA controls enable deterministic full-duplex burst transfers without bus contention.	Use Scenario: Upgrading aging ISA-bus peripherals with modern FPGA-based controllers while retaining original 5-V TTL signaling. IC Role / Device Role / Timing Role: Level- and timing-transparent bridge between legacy ISA address/data bus and new controller's synchronous interface. Use Value: 2.4 V min VOH and 0.55 V max VOL meet ISA specification; 8.5 ns t_PHL/t_PLH ensures setup/hold compliance at 8-MHz ISA clock.
Automated Test Equipment (ATE) I/O Conditioning	Programmable Logic I/O Expansion
Use Scenario: Driving and sampling multiple DUT signals simultaneously in boundary-scan test fixtures with shared 5-V bus architecture. IC Role / Device Role / Timing Role: Latched transceiver providing glitch-free, directionally isolated signal acquisition and stimulus generation under software control. Use Value: I_off allows safe power cycling of DUT boards while ATE controller remains powered; 2000-V HBM withstands probe contact discharge.	Use Scenario: Adding 16-bit bidirectional I/O to Xilinx Spartan-3 FPGA designs where native I/O banks are constrained by voltage or drive strength. IC Role / Device Role / Timing Role: Off-FPGA latched buffer extending I/O count with independent direction control and noise-suppressed outputs. Use Value: On-chip 25-Ω resistors eliminate layout congestion from discrete termination; matched edge rates reduce crosstalk in dense I/O clusters.

Industrial Backplane Interface

Legacy System Bus Expansion

Use Scenario: Interfacing microcontroller-based I/O modules to a 24-bit parallel backplane in programmable logic controllers.

IC Role / Device Role / Timing Role: Bidirectional latched transceiver managing isolated data transfer between CPU and peripheral cards with direction-controlled handshaking.

Use Value: Independent CEAB/CEBA and LEAB/LEBA controls enable deterministic full-duplex burst transfers without bus contention.

Use Scenario: Upgrading aging ISA-bus peripherals with modern FPGA-based controllers while retaining original 5-V TTL signaling.

IC Role / Device Role / Timing Role: Level- and timing-transparent bridge between legacy ISA address/data bus and new controller's synchronous interface.

Use Value: 2.4 V min VOH and 0.55 V max VOL meet ISA specification; 8.5 ns t_PHL/t_PLH ensures setup/hold compliance at 8-MHz ISA clock.

Automated Test Equipment (ATE) I/O Conditioning

Programmable Logic I/O Expansion

Use Scenario: Driving and sampling multiple DUT signals simultaneously in boundary-scan test fixtures with shared 5-V bus architecture.

IC Role / Device Role / Timing Role: Latched transceiver providing glitch-free, directionally isolated signal acquisition and stimulus generation under software control.

Use Value: I_off allows safe power cycling of DUT boards while ATE controller remains powered; 2000-V HBM withstands probe contact discharge.

Use Scenario: Adding 16-bit bidirectional I/O to Xilinx Spartan-3 FPGA designs where native I/O banks are constrained by voltage or drive strength.

IC Role / Device Role / Timing Role: Off-FPGA latched buffer extending I/O count with independent direction control and noise-suppressed outputs.

Use Value: On-chip 25-Ω resistors eliminate layout congestion from discrete termination; matched edge rates reduce crosstalk in dense I/O clusters.

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	Same pinout and function; faster 5.5 ns max propagation delay (vs. 8.5 ns)	Preferred for higher-speed bus interfaces requiring tighter timing margins	Select when system clock >12 MHz and setup/hold slack is critical
SN74FCT2543ATQCT	Same package; 6.5 ns max propagation delay; identical I_off, termination, and voltage specs	Suitable for mid-speed upgrades where CY74FCT2543TQCTG4 is obsolete or unavailable	Choose for drop-in replacement with improved timing over CY74FCT2543TQCTG4 without layout change

Compared with CY74FCT2543TQCTG4, CY74FCT2543CTQCT offers 3 ns lower propagation delay for timing-critical systems, while SN74FCT2543ATQCT provides a balanced speed/power trade-off with identical footprint and I_off behavior - both retain full functional and electrical compatibility for bus interface reuse.

Availability

CY74FCT2543TQCTG4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy bus expansion, automated test equipment I/O conditioning, and programmable logic I/O expansion requiring stable component supply and long-term lifecycle support.

Supply support for CY74FCT2543TQCTG4 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 CY74FCT2543TQCTG4 belongs to TI's FCT logic family, designed specifically for noise-immune, 5-V TTL-compatible bus interfacing in industrial and telecom infrastructure where signal integrity and power sequencing reliability are critical.

FAQ

What is the maximum operating temperature range for the CY74FCT2543TQCTG4?

The CY74FCT2543TQCTG4 is rated for operation from –40°C to +85°C ambient temperature. This industrial-grade range supports deployment in programmable logic controllers, motor drives, and factory automation equipment where thermal stability is essential. All electrical specifications - including VOH, VOL, and propagation delay - are guaranteed across this full range per the SCCS042C datasheet revision.

Does the CY74FCT2543TQCTG4 support hot-swap or partial-power-down operation?

Yes, the CY74FCT2543TQCTG4 includes I_off circuitry that disables outputs when V_CC = 0 V, limiting reverse current to ±1 µA even if A or B bus lines remain at up to 4.5 V. This feature enables safe insertion/removal in live backplanes and coordinated power sequencing in multi-rail systems - a key requirement confirmed in the absolute maximum ratings and functional description of the CY74FCT2543TQCTG4 datasheet.

What is the purpose of the CEAB and CEBA pins on the CY74FCT2543TQCTG4?

The CEAB (Chip Enable A-to-B) and CEBA (Chip Enable B-to-A) pins on the CY74FCT2543TQCTG4 are active-low direction controls that gate data flow before latch or output enable activation. CEAB must be low to allow A→B data capture or B-output driving; CEBA must be low for B→A operation. This dual-enable architecture prevents bus contention and enables independent directional arbitration - a core functional distinction verified in the device's function table and block diagram.

Can the CY74FCT2543TQCTG4 replace the CY74FCT543T in existing designs?

Yes, the CY74FCT2543TQCTG4 is explicitly documented as a drop-in replacement for the CY74FCT543T to reduce noise in existing designs. Both share identical pinout, logic function, and electrical specifications, but the CY74FCT2543TQCTG4 adds on-chip 25-Ω series termination resistors and enhanced edge-rate control - resulting in lower transmission-line reflection noise without modifying PCB layout or bill of materials.

What package type and marking does the CY74FCT2543TQCTG4 use?

The CY74FCT2543TQCTG4 uses a 24-pin SSOP (Shrink Small Outline Package) with DBQ drawing, 0.025-inch lead pitch, and NIPDAU surface finish. Its top-side marking is "FCT2543C", as confirmed in TI's official packaging addendum and ordering information tables - distinguishing it from "FCT2543A" (faster variant) and "FCT2543" (base speed grade).

CY74FCT2543TQCTG4 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

CY74FCT2543TQCTG4 FAQ

1.How can I place an order for CY74FCT2543TQCTG4 through Aetrix?

Please submit a Request for Quotation (RFQ) for CY74FCT2543TQCTG4 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 CY74FCT2543TQCTG4 reliable?

The price and inventory of CY74FCT2543TQCTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT2543TQCTG4 is usually 5 days.

3.What payment methods are accepted for CY74FCT2543TQCTG4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT2543TQCTG4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CY74FCT2543TQCTG4?

CY74FCT2543TQCTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CY74FCT2543TQCTG4 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 CY74FCT2543TQCTG4?

For technical support, including CY74FCT2543TQCTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT2543TQCTG4 requirements.

6.How does Aetrix verify that CY74FCT2543TQCTG4 is sourced from the original manufacturer or authorized distributors?

All CY74FCT2543TQCTG4 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 CY74FCT2543TQCTG4 meets industry standards.

7.What is the process for return or replacement of CY74FCT2543TQCTG4?

All CY74FCT2543TQCTG4 units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT2543TQCTG4, 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 CY74FCT2543TQCTG4 part is unused and in its original packaging.

Return procedure for CY74FCT2543TQCTG4:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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