Texas Instruments CY74FCT652CTSOCT

Overview

CY74FCT652CTSOCT 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 suppression, and Ioff partial-power-down support. It operates at 5 V, delivers 64 mA sink / 32 mA source drive, and achieves 5.4 ns propagation delay in SOIC-24 package. Used in bidirectional bus isolation and real-time/stored data multiplexing in industrial control backplanes.

For engineers reviewing the CY74FCT652CTSOCT datasheet, CY74FCT652CTSOCT pinout, CY74FCT652CTSOCT application, or CY74FCT652CTSOCT equivalent, key selection criteria include registered vs. transparent transfer mode, simultaneous clock enable for A/B storage, 3-state output timing (tPZH/tPLZ = 7.8 ns max), and compatibility with TTL-level inputs and FCT-family logic interfaces.

Technical Context

This device implements two independent 8-bit registered transceivers with separate CPAB/CPBA clocks and SAB/SBA select controls, enabling concurrent real-time and stored-data routing without decoding glitches. Its edge-rate control circuitry actively limits slew rate to reduce EMI, while matched rise/fall times ensure signal integrity across high-speed parallel buses.

The Ioff feature disables outputs when VCC = 0 V (±1 µA leakage), supporting hot-insertion and system-level power sequencing. Input thresholds (VIH = 2 V, VIL = 0.8 V) and output drive (VOH = 3.3 V typ at –15 mA, VOL = 0.55 V max at 64 mA) guarantee full TTL interoperability and robust noise margins in mixed-voltage environments.

Key Specifications

Pinout & Package

Package: SOIC-24 (DW), 7.5 mm × 15.4 mm body, 1.27 mm pitch, RoHS-compliant NIPDAU finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY74FCT652CTSOCT, the CY74FCT652ATSOCT trades 0.9 ns speed for lower dynamic current, while SN74FCT652NSR provides identical performance with alternate TI branding - both retain full pin, function, and timing compatibility for drop-in qualification.

Availability

CY74FCT652CTSOCT is available at Aetrix Electronics and suitable for industrial backplane interconnect, PLC I/O expansion, and automated test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for CY74FCT652CTSOCT 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.

CY74FCT652CTSOCT belongs to the 74FCT logic family, engineered for high-speed, low-noise, TTL-compatible bus interfacing in industrial control and instrumentation systems.

FAQ

What is the maximum clock frequency supported by CY74FCT652CTSOCT?

CY74FCT652CTSOCT does not operate on a system clock; its CPAB and CPBA inputs respond to asynchronous low-to-high transitions. With 5.4 ns propagation delay and 2 ns minimum pulse width, it reliably handles input edge rates up to approximately 185 MHz, assuming proper PCB layout and load capacitance ≤50 pF.

Does CY74FCT652CTSOCT support hot-swap operation?

Yes, CY74FCT652CTSOCT supports hot-swap via its Ioff feature: when VCC = 0 V, output leakage remains ≤±1 µA, preventing damaging current flow from live bus lines into the unpowered device - enabling safe insertion/removal in powered backplanes.

How does the SAB/SBA select logic prevent glitches during data mode switching?

CY74FCT652CTSOCT uses dedicated internal select-control circuitry that decouples the SAB/SBA decision path from the register clock domain. This eliminates race conditions during real-time ↔ stored-data transitions, ensuring no transient invalid states appear on outputs - critical for error-free bus arbitration.

Can CY74FCT652CTSOCT drive standard TTL loads directly?

Yes, CY74FCT652CTSOCT is fully TTL-compatible: inputs recognize VIH ≥2.0 V and VIL ≤0.8 V, while outputs deliver VOH ≥2.4 V (at –15 mA) and VOL ≤0.55 V (at 64 mA), meeting or exceeding standard TTL voltage and current requirements without external buffering.

What is the purpose of edge-rate control in CY74FCT652CTSOCT?

Edge-rate control in CY74FCT652CTSOCT actively limits output slew rate to reduce simultaneous switching noise (SSN) and electromagnetic interference (EMI). This maintains signal integrity on densely routed parallel buses and meets stringent industrial EMC standards without added board-level filtering.