Diodes Incorporated PI74FCT244DTQE

Overview

PI74FCT244DTQE from Pericom Semiconductor is a fast CMOS non-inverting octal buffer/line driver with dual 3-state output enables (OEA, OEB active-low), 25Ω series output resistors, TTL-compatible I/O levels, and industrial temperature range (–40°C to +85°C). It delivers 3.6 ns max propagation delay (tPLH/tPHL) at 50 pF load and supports high-speed bus driving in memory and address interfaces.

For engineers reviewing the PI74FCT244DTQE datasheet, PI74FCT244DTQE pinout, PI74FCT244DTQE application, or PI74FCT244DTQE equivalent, key selection criteria include output drive strength (64 mA sink), low ground bounce, input hysteresis (200 mV), quiescent current (≤500 µA), and QSOP-20 Pb-free packaging for dense PCB layouts.

Technical Context

This device implements two independent 4-bit non-inverting buffer sections, each controlled by separate 3-state enable inputs (OEA and OEB). All eight outputs feature integrated 25Ω series termination resistors to suppress transmission-line reflections without external components.

It operates at 5.0 V ±5%, supports TTL-level inputs (VIH = 2.0 V, VIL = 0.8 V), and guarantees VOH ≥2.4 V at –15 mA and VOL ≤0.55 V at 64 mA - enabling direct interface with legacy TTL and CMOS loads across industrial environments.

Key Specifications

Pinout & Package

PI74FCT244DTQE is housed in a 20-pin 150-mil wide plastic QSOP (Pb-free & Green) package with gull-wing leads and 0.65 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PI74FCT244TQE and SN74F244N, PI74FCT244DTQE provides the lowest propagation delay and integrated termination - making it optimal for new designs targeting >200 MHz bus timing and compact QSOP footprints.

Availability

PI74FCT244DTQE is available at Aetrix Electronics and suitable for memory address buffering, system bus driving, backplane interfacing, and legacy peripheral expansion requiring stable component supply and industrial temperature compliance.

Supply support for PI74FCT244DTQE 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 and signal integrity solutions, acquired by Diodes Incorporated in 2016; its FCT logic portfolio remains widely deployed in industrial and communications infrastructure.

The PI74FCT244x series belongs to Pericom's Fast CMOS logic family, designed specifically for high-speed, low-noise bus interfacing in 5 V systems where TTL compatibility and EMI reduction are critical.

FAQ

Is PI74FCT244DTQE pin-compatible with standard 74F244 devices?

Yes - PI74FCT244DTQE uses the same 20-pin QSOP footprint and pin assignment as industry-standard 74F244, including identical OEA/OEB placement and D/O mapping. Its TTL-compatible inputs and outputs ensure functional interoperability without redesign, though its lower power and faster timing offer immediate system-level benefits.

What is the purpose of the 25Ω series resistor on each output?

The integrated 25Ω series resistor dampens signal reflections on PCB traces by matching typical FR-4 characteristic impedance (50–75 Ω) in source-series termination configurations. This eliminates discrete resistors, reduces BOM count, and improves signal integrity on stubbed or point-to-point buses up to 10 inches long without requiring layout changes.

Can PI74FCT244DTQE operate at 3.3 V?

No - PI74FCT244DTQE is specified only for 5.0 V ±5% operation. Its input thresholds (VIH = 2.0 V, VIL = 0.8 V) and output drive characteristics are optimized for 5 V rail compliance. Using it at 3.3 V risks undefined logic states, insufficient VOH, and potential damage due to internal biasing constraints.

How does the dual enable (OEA/OEB) architecture improve system timing control?

OEA and OEB independently gate two 4-bit output groups, allowing phased enable sequencing - e.g., enabling address bits before data bits - to prevent bus contention or metastability during state transitions. This eliminates need for external timing logic or additional buffers when coordinating multi-cycle transfers in synchronous systems.