Texas Instruments CY74FCT2245CTSOCG4

Overview

CY74FCT2245CTSOCG4 from Texas Instruments is an 8-bit noninverting bidirectional transceiver with 3-state outputs, 25-Ω integrated output series resistors, I_off partial-power-down support, and TTL-compatible logic levels. It operates at 4.75–5.25 V, delivers ±15 mA output drive, and achieves 4.1 ns typical propagation delay for bus isolation in industrial control backplanes and memory interface subsystems.

For engineers reviewing the CY74FCT2245CTSOCG4 datasheet, CY74FCT2245CTSOCG4 pinout, CY74FCT2245CTSOCG4 application, or CY74FCT2245CTSOCG4 equivalent, key selection criteria include its 20-pin SOIC package, direction-controlled data flow (T/R input), dual-port 3-state enable (OE), and noise-suppressing edge-rate control - all critical for legacy TTL-to-FCT bus upgrades and hot-swap-capable peripheral interconnects.

Technical Context

The CY74FCT2245CTSOCG4 implements a dual-rail bidirectional buffer architecture with independent A and B port terminals, where the T/R input selects data direction (A→B high, B→A low) and OE globally disables both ports into high-impedance state. Its on-die 25-Ω series termination minimizes transmission-line reflections without external resistors.

I_off circuitry actively isolates A/B ports when V_CC = 0 V, preventing reverse current flow during partial power-down sequences. Input thresholds (V_IL = 0.8 V, V_VIH = 2.0 V) and output swing (V_OL = 0.55 V @ 12 mA, V_OH = 2.4 V @ –15 mA) ensure full compatibility with standard TTL logic families across –40°C to +85°C operation.

Key Specifications

Pinout & Package

Package: 20-pin SOIC (DW), 7.5 mm × 12.8 mm body, 1.27 mm pitch, 2.65 mm max height, RoHS-compliant NIPDAU lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74FCT2245CTSOCT, CY74FCT2245CTSOCG4 offers identical performance in tube packaging for low-volume builds and lab validation; versus 74LVC245APW,118, it provides native 5-V operation, built-in termination, and superior noise suppression - making it irreplaceable in mixed-voltage industrial upgrades.

Availability

CY74FCT2245CTSOCG4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory subsystem isolation, legacy system bus upgrades, hot-swappable peripheral interconnects, and embedded controller data bus expansion requiring stable component supply and long-term lifecycle support.

Supply support for CY74FCT2245CTSOCG4 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 expertise in high-reliability industrial and automotive-grade components.

The CY74FCT2245CTSOCG4 belongs to TI's FCT logic family, engineered specifically for noise-sensitive 5-V bus applications requiring TTL compatibility, low skew, and robust ESD performance in harsh operating environments.

FAQ

What is the maximum operating temperature range for CY74FCT2245CTSOCG4?

CY74FCT2245CTSOCG4 is fully specified for operation from –40°C to +85°C ambient temperature. This industrial-grade range supports deployment in factory automation controllers, outdoor telecom equipment, and motor drive systems where thermal cycling and extended temperature exposure are routine. All electrical parameters - including propagation delay, output drive, and I_off leakage - are guaranteed across this full range.

Does CY74FCT2245CTSOCG4 support true bidirectional data flow without external logic?

Yes, CY74FCT2245CTSOCG4 supports true bidirectional data flow using only two control inputs: T/R (transmit/receive) sets direction (A→B or B→A), and OE (output enable) places both ports in high-impedance state. No external gates or latches are needed - the internal logic handles direction arbitration synchronously with data edges, enabling seamless bus handshaking in master-slave architectures.

Can CY74FCT2245CTSOCG4 replace CY74FCT245T in existing designs?

Yes, CY74FCT2245CTSOCG4 is explicitly designed as a functional and pin-compatible replacement for CY74FCT245T. Both share identical pinout, timing, and logic behavior; however, CY74FCT2245CTSOCG4 adds 25-Ω on-die series resistors and enhanced edge-rate control - providing superior noise immunity without requiring layout changes or additional components.

What is the purpose of the I_off feature in CY74FCT2245CTSOCG4?

The I_off feature in CY74FCT2245CTSOCG4 disables all outputs and blocks current flow when V_CC = 0 V, preventing damaging back-current from live buses into a powered-down section. This enables safe partial-power-down modes during system sleep states or hot-swap operations - a critical requirement in modular industrial systems where subsystems power up/down independently while shared data buses remain energized.

Is CY74FCT2245CTSOCG4 compatible with standard TTL logic families?

Yes, CY74FCT2245CTSOCG4 is fully compatible with standard TTL logic families. Its input thresholds (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V) and output voltage levels (V_OL ≤ 0.55 V @ 12 mA, V_OH ≥ 2.4 V @ –15 mA) meet or exceed 74LS, 74ALS, and 74F specifications. This allows direct connection to legacy microcontrollers, CPLDs, and peripheral ICs without level-shifting circuitry.