Diodes Incorporated PI74FCT244TSEX

Overview

PI74FCT244TSEX from Pericom Semiconductor is a fast CMOS non-inverting octal buffer/line driver with dual 3-state output enables (OEA, OEB), TTL-compatible input/output levels, 25Ω series output resistors, and industrial temperature range (–40°C to +85°C). It delivers 64mA sink current per output, 1.5ns minimum propagation delay, and low ground bounce for high-speed bus driving in memory and address interfaces.

For engineers reviewing the PI74FCT244TSEX datasheet, PI74FCT244TSEX pinout, PI74FCT244TSEX application, or PI74FCT244TSEX equivalent, key selection criteria include output drive strength (64mA), integrated 25Ω termination, dual active-Low/active-High enable logic, propagation delay (≤6.5ns), and compatibility with legacy Fast Series bipolar logic.

Technical Context

This device implements two independent 4-bit non-inverting buffer sections, each controlled by separate 3-state enable inputs (OEA and OEB). Its architecture supports bidirectional bus isolation via independent enable control and eliminates external termination through on-die 25Ω series resistors on all eight outputs.

It operates at 5.0V ±5%, meets TTL voltage thresholds (VIH = 2.0V, VIL = 0.8V), and features hysteresis on all inputs for noise immunity. Quiescent supply current is ≤500μA, and dynamic power scales linearly with input toggle rate (0.15–0.25mA/MHz).

Key Specifications

Pinout & Package

PI74FCT244TSEX is supplied in a 20-pin 150-mil wide plastic QSOP (Package Code Q) with Pb-free and Green compliance (E suffix). The package has standard 0.635mm lead pitch and gull-wing leads suitable for surface-mount reflow assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74F244N and 74LCX244MTCX, PI74FCT244TSEX uniquely combines 5V TTL compatibility, on-die termination, industrial temperature rating, and sub-500μA quiescent current - making it optimal for retrofitting legacy 5V systems requiring reliability and reduced component count.

Availability

PI74FCT244TSEX is available at Aetrix Electronics and suitable for memory address buffering, system bus driving, backplane interfacing, and legacy logic upgrades requiring stable component supply and long-term industrial availability.

Supply support for PI74FCT244TSEX 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-speed interface, timing, and signal-integrity solutions, later acquired by Diodes Incorporated in 2016. It specialized in logic, clock, and interconnect ICs for computing and communications infrastructure.

PI74FCT244TSEX belongs to the FCT2XXX family of Fast CMOS buffers, designed specifically for 5V TTL-compatible bus driving with enhanced noise immunity, low power, and integrated termination - targeting industrial, telecom, and embedded control applications.

FAQ

Is PI74FCT244TSEX pin-compatible with standard 74F244 devices?

Yes, PI74FCT244TSEX uses the same 20-pin QSOP footprint and identical pin assignment as industry-standard 74F244, including matching OEA/OEB enable locations and DA/OA/DB/OB signal ordering. This allows direct replacement without PCB redesign, provided the target system operates within the FCT family's 5V ±5% supply and industrial temperature range.

Does PI74FCT244TSEX require external pull-up or pull-down resistors on its enable inputs?

No. OEA and OEB inputs have built-in hysteresis and TTL-compatible thresholds (VIH = 2.0V, VIL = 0.8V), allowing direct connection to microcontroller GPIOs or other logic outputs. External biasing is unnecessary unless the driving source floats or exhibits marginal voltage levels outside these specifications.

Can PI74FCT244TSEX drive unterminated 50Ω transmission lines?

Yes - its integrated 25Ω series output resistors are designed to match typical PCB trace impedances when paired with standard 50Ω loads, minimizing reflections. For best results, use with 50–75Ω loads and keep trace lengths under 15cm; longer runs may still benefit from additional end termination depending on edge rate and frequency.

What is the maximum clock/data toggle rate supported by PI74FCT244TSEX?

While not a clocked device, PI74FCT244TSEX supports data transitions up to ≥150MHz based on its 6.5ns max propagation delay and 4.8ns max output enable time. System-level bandwidth is limited by load capacitance; with 50pF load, it reliably handles 100MHz data bursts, confirmed by dynamic current specs (ICCD = 0.15–0.25mA/MHz).