Texas Instruments CY74FCT2652CTQCTE4

Overview

CY74FCT2652CTQCTE4 from Texas Instruments is an 8-bit registered transceiver with 3-state outputs, dual independent D-type registers (A and B buses), edge-rate control for noise reduction, and I_off support for partial-power-down operation. It operates at 5 V, delivers ±15 mA drive strength, and features 25-Ω on-chip series output termination to suppress transmission-line reflections in high-speed bus systems.

For engineers reviewing the CY74FCT2652CTQCTE4 datasheet, CY74FCT2652CTQCTE4 pinout, CY74FCT2652CTQCTE4 application, or CY74FCT2652CTQCTE4 equivalent, key selection considerations include real-time vs. stored data multiplexing capability, simultaneous A/B register clocking behavior, 5.4 ns propagation delay (max), TTL-compatible logic levels, and QSOP-24 package compatibility with legacy FCT-family layouts.

Technical Context

The CY74FCT2652CTQCTE4 integrates two independent 8-bit D-type flip-flop registers with separate clock (CPAB/CPBA), select (SAB/SBA), and enable (GAB/GBA) controls - enabling concurrent storage of A- and B-bus data without decoding glitches. Its edge-rate control circuitry actively limits slew rate to reduce EMI and crosstalk in dense PCB routing.

It supports true bidirectional data flow with three-state outputs per channel, I_off protection that disables outputs when V_CC = 0 V to prevent backflow current during partial power-down, and matched rise/fall times (t_r/t_f ≈ 1 ns) ensuring clean signal integrity across all 16 I/Os.

Key Specifications

Pinout & Package

Package: QSOP-24 (SSOP, DBQ), 3.9 mm × 8.7 mm body, 0.635 mm pitch, RoHS-compliant NIPDAU finish, MSL Level-2-260°C-1 year.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar registered transceiver applications.

Compared with CY74FCT2652ATQCT and SN74FCT2652CTPWR, the CY74FCT2652CTQCTE4 offers the fastest propagation (5.4 ns), maintains full pin/function compatibility with both alternatives, and is optimized for QSOP-24 assembly processes - making it ideal for timing-critical industrial bus extensions where layout reuse and signal integrity are prioritized.

Availability

CY74FCT2652CTQCTE4 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, backplane data routing, and legacy system bus extension requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for CY74FCT2652CTQCTE4 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 CY74FCT2652CTQCTE4 belongs to TI's FCT logic family - engineered for high-speed, low-noise 5 V TTL-compatible bus interfacing with emphasis on signal integrity, power-down safety, and drop-in replacement capability for legacy 74-series designs.

FAQ

What is the maximum operating frequency supported by the CY74FCT2652CTQCTE4?

The CY74FCT2652CTQCTE4 supports reliable operation up to 185 MHz, derived from its 5.4 ns maximum propagation delay (t_PLH/t_PHL) under recommended conditions. This enables use in high-speed synchronous bus systems where setup/hold timing margins must accommodate clock skew and trace delays. The device's matched rise/fall times and edge-rate control further ensure clean transitions at this rate without excessive jitter or overshoot.

Does the CY74FCT2652CTQCTE4 support hot-swap or partial-power-down operation?

Yes, the CY74FCT2652CTQCTE4 includes I_off circuitry that disables all outputs when V_CC = 0 V, limiting leakage current to ±1 µA. This feature permits safe insertion or removal in live backplane or multi-rail systems where the device may be unpowered while adjacent circuits remain active - preventing damaging backflow current and meeting industrial hot-swap requirements without external protection circuitry.

How does the CY74FCT2652CTQCTE4 handle real-time versus stored data transfer without glitches?

The CY74FCT2652CTQCTE4 uses dedicated select-control logic (SAB/SBA) that decouples mode switching from clock and enable signals - eliminating the decoding glitches common in traditional multiplexers. A low level on SAB/SBA routes real-time data directly, while a high level routes data from the internal D-type registers. Transitions between modes occur cleanly because register updates and bus direction control operate independently, ensuring no intermediate invalid states appear on the output buses.

Can the CY74FCT2652CTQCTE4 replace older 74FCT652 devices in existing designs?

Yes, the CY74FCT2652CTQCTE4 is functionally and pinout-compatible with the CY74FCT652T and offers enhanced noise performance due to integrated 25-Ω output series resistors and edge-rate control. It can directly replace CY74FCT652T in existing layouts without PCB changes, delivering improved signal integrity and reduced transmission-line reflections - especially beneficial in designs experiencing ringing or EMI issues at higher frequencies.

What are the key thermal and packaging specifications for the CY74FCT2652CTQCTE4?

The CY74FCT2652CTQCTE4 uses a QSOP-24 (DBQ) package with 0.635 mm pitch, 3.9 mm × 8.7 mm body size, and NIPDAU lead finish. Its thermal impedance θ_JA is 61°C/W, and it is rated for operation from –40°C to +85°C ambient. The device complies with RoHS and has MSL Level-2-260°C-1 year rating, supporting standard reflow profiles without special moisture preconditioning.