Diodes Incorporated PI74FCT244ATSE

Overview

PI74FCT244ATSE from Pericom Semiconductor is a fast CMOS non-inverting octal buffer/line driver with 3-state outputs, designed for high-speed bus driving in 5V TTL-compatible systems. It features dual active-low output enables (OEA/OEB), 25Ω series output resistors to suppress reflections, TTL-level inputs/outputs, and operates across –40°C to +85°C. Used in address/data bus buffering for industrial control backplanes.

For engineers reviewing the PI74FCT244ATSE datasheet, PI74FCT244ATSE pinout, PI74FCT244ATSE application, or PI74FCT244ATSE equivalent, key selection criteria include propagation delay (≤4.8 ns), output drive strength (64 mA sink), input hysteresis (200 mV), 3-state enable timing, and SOIC-20 Pb-free packaging compliance.

Technical Context

This device implements two independent 4-bit non-inverting buffers, each controlled by dedicated 3-state enable inputs (OEA for A-side, OEB for B-side). All eight outputs incorporate integrated 25Ω series termination resistors, eliminating external resistors and reducing signal integrity issues on stub-loaded buses.

It uses Fast CMOS technology to achieve TTL-compatible voltage thresholds (VIH = 2.0 V, VIL = 0.8 V) while delivering low static current (≤500 µA) and low ground bounce. Input hysteresis ensures noise immunity on slow-rising signals, and the industrial temperature range supports deployment in embedded controllers and instrumentation.

Key Specifications

Pinout & Package

PI74FCT244ATSE is supplied in a Pb-free and Green-compliant 20-pin 300-mil wide plastic SOIC (Small Outline Integrated Circuit) package.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74F244N and 74LCX244MTCX, PI74FCT244ATSE uniquely combines 5V TTL compatibility, on-die termination, hysteresis, and industrial temp rating - making it optimal for retrofitting legacy 5V systems requiring improved signal integrity without layout changes.

Availability

PI74FCT244ATSE is available at Aetrix Electronics and suitable for industrial backplane bus drivers, memory address buffering, and system clock distribution requiring stable component supply and Pb-free compliance.

Supply support for PI74FCT244ATSE 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

Pericom Semiconductor was a fabless provider of high-performance interface, timing, and signal integrity solutions, acquired by Diodes Incorporated in 2016. Known for low-jitter clock devices and robust logic families.

PI74FCT244ATSE belongs to the FCT2xxx Fast CMOS logic family, engineered specifically for 5V TTL-compatible bus interfacing with enhanced noise immunity and reduced EMI - targeting industrial control, test equipment, and communications infrastructure.

FAQ

What is the maximum capacitive load the PI74FCT244ATSE can drive reliably?

The device is characterized for CL = 50 pF in switching tests and rated for 64 mA output sink current. With its integrated 25 Ω series resistor, it reliably drives up to 75 pF total load (including trace + input capacitance) while maintaining ≤4.8 ns tPLH/tPHL and monotonic edges - verified per datasheet Figure 5 load vs. delay curves.

Can OEA and OEB be tied together for single-enable operation?

Yes - OEA and OEB are electrically independent but may be connected to a common enable signal. Doing so activates all eight outputs simultaneously. This configuration is used in simple unidirectional bus drivers and is validated in the truth table under "OEA = OEB = L" condition.

Does the PI74FCT244ATSE support hot-swap or live-insertion?

No - the device lacks powered-off protection (IOFF spec is 100 µA at VCC = GND, not zero), and its inputs are not 5.5 V tolerant. Applying signals before VCC stabilization risks latch-up. Hot-swap requires external current-limiting and sequencing circuitry per application note AN-103.

Is the 25 Ω series resistor present on both sourcing and sinking paths?

Yes - the 25 Ω resistor is placed in series with each output transistor's drain path, affecting both high-to-low and low-to-high transitions equally. This is confirmed in the "Features" section and reflected in matched tPLH/tPHL values (1.5–4.8 ns) and symmetric VOL/VOH specs under 64 mA/–15 mA loads.