Texas Instruments CD74FCT244SM96

Overview

CD74FCT244SM96 from Texas Instruments is a BiCMOS octal noninverting buffer/line driver with 3-state outputs, designed for bus interface and data routing in 5-V TTL-compatible systems. It features two independent 4-bit sections, each with active-low output-enable control, 64-mA sink capability per output, 3.7-V limited high-level output swing, and controlled edge rates to suppress EMI. It operates across 0°C to 70°C in a 20-pin SOIC package.

For engineers reviewing the CD74FCT244SM96 datasheet, CD74FCT244SM96 pinout, CD74FCT244SM96 application, or CD74FCT244SM96 equivalent, this page delivers verified electrical parameters, functional behavior under simultaneous switching, thermal performance in SOIC-DW packaging, and real-world design implications of its BiCMOS output stage and VCC-isolated I/O architecture.

Technical Context

The CD74FCT244SM96 implements a hybrid BiCMOS output stage combining bipolar and CMOS transistors to clamp VOH at ~3.7 V (two diode drops below VCC), reducing power-bus ringing and ground bounce during high-speed bus transitions. Its dual 4-bit structure enables independent enable control per section (1OE and 2OE), supporting selective bus isolation without full device shutdown.

Input/Output isolation from VCC prevents back-driving during power sequencing, while buffered inputs ensure stable logic thresholds across temperature. The device meets TTL input voltage levels (VIL ≤ 0.8 V, VIH ≥ 2 V) and delivers guaranteed VOL ≤ 0.55 V at 64 mA sink, enabling robust noise margin in mixed-signal environments.

Key Specifications

Pinout & Package

CD74FCT244SM96 uses a 20-pin SOIC package (DW suffix), 7.4–7.6 mm wide, 12.6–13.0 mm long, max height 2.65 mm, with JEDEC MS-013 compliance and RoHS-compliant NiPdAu lead finish. Moisture sensitivity level is Level-1 (unlimited floor life at ≤30°C/60% RH).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal 3-state buffer applications.

Compared with SN74F244N and 74ACT244SCX, the CD74FCT244SM96 uniquely balances high sink current (64 mA), EMI-suppressing output clamping, and latch-up immunity-making it optimal for noisy, high-fanout 5-V bus environments where reliability trumps raw speed.

Availability

CD74FCT244SM96 is available at Aetrix Electronics and suitable for industrial control panels, legacy system upgrades, and embedded bus interface designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant SOIC packaging.

Supply support for CD74FCT244SM96 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 logic families and industrial-grade components.

The CD74FCT244SM96 belongs to TI's FCT logic family, engineered specifically for noise-sensitive 5-V digital systems requiring robust bus driving, EMI control, and seamless integration with TTL and CMOS interfaces.

FAQ

What is the maximum output sink current specification for CD74FCT244SM96?

The CD74FCT244SM96 guarantees 64 mA of output sink current per pin under recommended operating conditions (VCC = 4.75 V, TA = 25°C). This rating is confirmed in the "Electrical Characteristics" table of the official datasheet and enables direct driving of multiple TTL inputs or moderate capacitive loads without external buffering. Exceeding this current risks violating VOL specifications or thermal limits in sustained operation.

Does CD74FCT244SM96 support hot-swap or partial power-down scenarios?

Yes, CD74FCT244SM96 supports safe partial power-down due to its input/output isolation from VCC-a key feature of its BiCMOS architecture. When VCC is unpowered or ramping, inputs and outputs remain electrically decoupled, preventing back-current injection. However, OE pins must be externally held high (e.g., via pull-up resistors) during power transitions to maintain high-impedance outputs and avoid bus contention.

How does the 3.7-V output voltage swing of CD74FCT244SM96 improve system EMI performance?

The CD74FCT244SM96 limits VOH to approximately 3.7 V (two diode drops below VCC) using its BiCMOS output stage. This reduced voltage swing lowers dv/dt during signal transitions, directly suppressing power-bus ringing and minimizing VCC/ground bounce during simultaneous output switching-key contributors to radiated EMI in dense PCB layouts. Measured noise characteristics confirm dynamic VOL(P) ≤ 1 V and VOH(V) ≥ 0.5 V under 50-pF loading.

What is the recommended pull-up resistor value for OE pins on CD74FCT244SM96 during power-up?

The minimum pull-up resistor value for OE pins on CD74FCT244SM96 is determined by the current-sinking capability of the upstream driver, as specified in the datasheet. For standard TTL or CMOS drivers, a 4.7-kΩ resistor to VCC is commonly used-ensuring OE remains above 2 V (VIH) while limiting current to <1 mA. This value maintains high-impedance outputs at power-on and avoids contention on shared bus lines.

Is CD74FCT244SM96 pin-compatible with CD74FCT244M96 or CD74FCT244ATM96?

Yes, CD74FCT244SM96 shares identical pinout, package dimensions (SOIC-DW, 20-pin), and functional logic with CD74FCT244M96 and CD74FCT244ATM96. All three use the same top-side marking footprint and PCB land pattern. However, CD74FCT244ATM96 belongs to the faster FCT244AT variant (tpd up to 5.3 ns vs. 6.5 ns), while CD74FCT244SM96 and CD74FCT244M96 are functionally identical FCT244 versions with matching AC/DC specs.