Texas Instruments CY74FCT244DTSOCTE4

Overview

CY74FCT244DTSOCTE4 from Texas Instruments is an octal 3-state buffer/line driver IC used for memory address driving, clock distribution, and bus transceiver applications in TTL- and CMOS-compatible digital systems. It features 64-mA sink / 32-mA source output drive, 3.6-ns max propagation delay, Ioff partial-power-down support, and edge-rate control for noise reduction.

For engineers reviewing the CY74FCT244DTSOCTE4 datasheet, CY74FCT244DTSOCTE4 pinout, CY74FCT244DTSOCTE4 application, or CY74FCT244DTSOCTE4 equivalent, key selection criteria include 3-state bus isolation capability, 5-V TTL/CMOS interface compatibility, industrial temperature range (–40°C to 85°C), SOIC-20 package footprint, and Ioff-enabled system-level power sequencing.

Technical Context

This device implements dual 4-bit noninverting buffers with independent 3-state enable controls (OEA and OEB), supporting bidirectional bus interfacing without direction pins. Each half drives four outputs with matched rise/fall times and edge-rate-controlled transitions to minimize simultaneous switching noise.

It operates within 4.75 V to 5.25 V supply range and fully supports partial-power-down via Ioff, which disables outputs and limits leakage to ±1 µA when VCC = 0 V - enabling safe hot-insertion and mixed-voltage domain operation.

Key Specifications

Pinout & Package

Package: SOIC-20 (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 (unlimited reflow).

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, CY74FCT244DTSOCTE4 uniquely combines industrial temperature rating, Ioff safety, edge-rate control for EMI reduction, and guaranteed 4.75–5.25 V operation - making it optimal for new industrial designs requiring robustness and power flexibility.

Availability

CY74FCT244DTSOCTE4 is available at Aetrix Electronics and suitable for industrial control systems, test equipment interfaces, legacy system upgrades, and embedded bus expansion requiring stable component supply and long-term manufacturability.

Supply support for CY74FCT244DTSOCTE4 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 connectivity solutions for industrial, automotive, and communications markets.

CY74FCT244DTSOCTE4 belongs to the TI FCT logic family, engineered for high-speed, low-noise, 5-V TTL/CMOS interoperability in mission-critical industrial and instrumentation applications.

FAQ

What is the maximum operating frequency supported by CY74FCT244DTSOCTE4?

CY74FCT244DTSOCTE4 does not specify a maximum clock frequency directly, but its 3.6-ns maximum propagation delay (tPLH/tPHL) supports reliable data toggling up to approximately 270 MHz under ideal conditions. Actual usable frequency depends on load capacitance, trace routing, and system timing margins - for clock distribution, it is commonly deployed in ≤100-MHz synchronous buses where edge-rate control maintains signal integrity.

Does CY74FCT244DTSOCTE4 support hot-swap or live insertion?

Yes, CY74FCT244DTSOCTE4 supports hot-swap operation via its Ioff circuitry, which disables outputs and limits leakage current to ±1 µA when VCC = 0 V. This prevents damaging current backflow during insertion into a powered backplane. However, external current-limiting resistors and proper connector sequencing (ground-first, power-last) are still recommended for full system-level hot-swap compliance.

Can CY74FCT244DTSOCTE4 drive multiple TTL inputs directly?

Yes, CY74FCT244DTSOCTE4 can drive up to 20 standard TTL inputs per output due to its 64-mA sink capability (exceeding the 1.6-mA per input requirement). Its 32-mA source current also satisfies TTL high-level loading. No external pull-up resistors are needed, and the 2-V VIH threshold ensures compatibility with TTL output swing ranges.

Is CY74FCT244DTSOCTE4 pin-compatible with older 74LS244 devices?

CY74FCT244DTSOCTE4 uses the same SOIC-20 pinout and logic function as 74LS244, enabling direct PCB replacement in many cases. However, differences in drive strength (64 mA vs. 8 mA), input thresholds (2 V vs. 2.0 V min), and Ioff behavior require verification of timing margins and power sequencing - especially in systems with unpowered downstream logic.

What is the purpose of edge-rate control in CY74FCT244DTSOCTE4?

Edge-rate control in CY74FCT244DTSOCTE4 intentionally slows output voltage transitions to reduce high-frequency spectral content, minimizing radiated EMI and crosstalk in densely routed PCBs. Unlike slew-rate limiting that degrades timing, this feature preserves propagation delay while improving noise characteristics - critical for compliance with FCC Class B emissions limits in industrial enclosures.