Texas Instruments CY74FCT652CTSOCG4

Overview

CY74FCT652CTSOCG4 from Texas Instruments is an 8-bit registered transceiver with 3-state outputs, designed for bidirectional data bus isolation and registered multiplexed transfer between A and B buses in TTL/CMOS mixed-signal systems. It features independent D-type flip-flop registers per bus, edge-rate control for noise reduction, Ioff partial-power-down support, 5.4 ns propagation delay (max), and 64 mA sink / 32 mA source drive capability.

For engineers reviewing the CY74FCT652CTSOCG4 datasheet, CY74FCT652CTSOCG4 pinout, CY74FCT652CTSOCG4 application, or CY74FCT652CTSOCG4 equivalent, key selection considerations include real-time vs. stored-data transfer mode control via SAB/SBA, simultaneous clock-edge storage on CPAB/CPBA, and SOIC-24 package compatibility with legacy FCT logic families.

Technical Context

This device implements dual 8-bit registered transceivers with separate clock (CPAB/CPBA), select (SAB/SBA), and output-enable (GAB/GBA) controls. Its architecture supports four distinct operational modes: real-time A→B/B→A transfer, stored-data A↔B transfer, and independent register loading - all without decoding glitches during mode transitions.

The internal logic eliminates metastability risks during select-mode switching by decoupling clock-triggered storage from select-control timing. Edge-rate control circuitry ensures matched rise/fall times (typical 3.5 ns), while Ioff protection disables outputs at VCC = 0 V to prevent backflow current during partial power-down sequences.

Key Specifications

Pinout & Package

Package: SOIC-24 (DW), body size 15.4 mm × 7.5 mm, 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 CY74FCT652CTSOCG4, the CY74FCT652ATSOCT trades 0.9 ns speed for broader timing margin and lower cost, while SN74FCT652CTSO offers identical performance in a discontinued marking variant - making CY74FCT652CTSOCG4 the optimal choice for new designs requiring guaranteed long-term availability and full FCT family compliance.

Availability

CY74FCT652CTSOCG4 is available at Aetrix Electronics and suitable for memory bus isolation, processor-peripheral interfacing, backplane data multiplexing, and legacy system bus extension requiring stable component supply across industrial, telecom, and embedded computing programs.

Supply support for CY74FCT652CTSOCG4 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 over 50 years of innovation in high-reliability interface and timing products.

The CY74FCT652CTSOCG4 belongs to TI's FCT logic family, engineered for robust 5-V mixed-signal interfacing with emphasis on noise immunity, power-down safety, and seamless integration into legacy and upgrade systems.

FAQ

What is the maximum operating temperature range for CY74FCT652CTSOCG4?

The CY74FCT652CTSOCG4 is rated for operation from –40°C to +85°C ambient temperature, meeting industrial-grade thermal requirements. This range is validated per TI's recommended operating conditions and supported by thermal impedance data (θJA = 46°C/W for SOIC package), ensuring reliable performance in enclosed enclosures and high-density PCB environments without forced airflow.

Does CY74FCT652CTSOCG4 support true bidirectional data flow without external control logic?

Yes, CY74FCT652CTSOCG4 supports concurrent bidirectional data flow through independent GAB and GBA enable controls. When GAB = L and GBA = L, both A→B and B→A paths are active simultaneously - enabling real-time echo-back or loopback verification. No external logic is needed to coordinate directionality, as each path operates autonomously based on its dedicated enable and select signals.

How does the Ioff feature of CY74FCT652CTSOCG4 protect the device during partial power-down?

The Ioff feature in CY74FCT652CTSOCG4 disables all outputs when VCC = 0 V, blocking current flow from live bus lines (e.g., 5-V A/B buses) into the unpowered device. This prevents reverse current damage to internal circuitry and avoids unintended activation of downstream components, a critical safeguard in modular systems where boards may be hot-swapped or powered independently.

Can CY74FCT652CTSOCG4 store data without using its internal registers?

Yes, CY74FCT652CTSOCG4 can pass real-time data transparently without register involvement: when SAB = SBA = L (real-time mode) and both GAB = L and GBA = L, outputs reinforce their respective inputs. In this configuration, each bus retains its last driven state as long as no other driver asserts onto the line - effectively creating a latch-like behavior without clocking or storage register use.

What is the significance of the "C" speed grade in CY74FCT652CTSOCG4?

The "C" in CY74FCT652CTSOCG4 denotes the 5.4 ns maximum propagation delay speed grade - the fastest available in the CY74FCT652 series. This grade guarantees timing compliance in high-throughput 5-V systems such as network packet processors and real-time test equipment, where sub-6 ns latency is required to meet setup/hold windows for synchronous memory or FPGA interfaces.