Diodes Incorporated PI74FCT2541ATSEX

Overview

PI74FCT2541ATSEX from Pericom Semiconductor is a fast CMOS non-inverting octal buffer/line driver with 8-bit wide output drive, TTL-compatible input/output levels, and built-in 25Ω series output resistors for reflection suppression. It operates from 4.5V to 5.5V, supports –40°C to +85°C industrial temperature range, and is used in bus driving, memory address buffering, and system clock distribution.

For engineers reviewing the PI74FCT2541ATSEX datasheet, PI74FCT2541ATSEX pinout, PI74FCT2541ATSEX application, or PI74FCT2541ATSEX equivalent, key selection criteria include propagation delay (≤3.8 ns), output enable/disable timing (≤5.2 ns), 64mA output drive capability, low ground bounce, and QSOP-20 package compatibility with high-density PCB layouts.

Technical Context

This device implements dual 3-state output enable control (OEA active-low, OEB active-high) with physically separated input and output pin groups-inputs on one side, outputs on the opposite side-to simplify routing and reduce crosstalk. Its FCT logic family delivers higher speed and lower static power than bipolar Fast Series equivalents.

All outputs integrate a 25Ω series resistor to damp signal reflections on transmission lines, eliminating external termination components. Inputs feature hysteresis (200 mV) for noise immunity, and the device maintains TTL-level compatibility while operating on a 5V CMOS process.

Key Specifications

Pinout & Package

PI74FCT2541ATSEX is packaged in a 20-pin plastic QSOP (150-mil width), RoHS-compliant and lead-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74FCT2541CTSE and 74LVC244APW, PI74FCT2541ATSEX uniquely combines industrial temperature range, input hysteresis, and on-die 25Ω termination - making it the only drop-in solution for robust 5V bus buffering in harsh environments without redesign.

Availability

PI74FCT2541ATSEX is available at Aetrix Electronics and suitable for bus interface buffering, memory address driving, and system clock distribution requiring stable component supply across industrial production cycles.

Supply support for PI74FCT2541ATSEX 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, acquired by Diodes Incorporated in 2016; its FCT logic portfolio remains widely deployed in industrial and communications infrastructure.

The PI74FCT2XXX series was designed specifically for 5V system interconnect - delivering TTL-compatible performance with CMOS efficiency, targeted at bus buffering, address latching, and clock fan-out in legacy and hybrid digital systems.

FAQ

What is the maximum output current per pin for PI74FCT2541ATSEX?

The device supports up to 64 mA sink current per output pin under DC conditions, verified per its Absolute Maximum Ratings and Electrical Characteristics table. This rating applies with VCC = 4.5 V minimum and ambient temperature ≤+85°C. Sustained operation at full 64 mA requires adequate PCB copper pour and thermal relief design to maintain junction temperature within safe limits.

Does PI74FCT2541ATSEX require external pull-up or pull-down resistors on its enable pins?

No external biasing resistors are required on OEA or OEB. Both inputs have TTL-compatible thresholds (VIH = 2.0 V, VIL = 0.8 V) and negligible leakage (IIH ≤ 1 μA, IIL ≥ –1 μA), allowing direct connection to microcontroller GPIOs or open-collector logic outputs without passive termination.

Can PI74FCT2541ATSEX be used with 3.3V logic inputs?

Yes - its VIH threshold is 2.0 V minimum, so standard 3.3V CMOS outputs (VOH ≥ 2.4 V) fully satisfy input HIGH requirements. However, the device must be powered from 5V (4.5–5.5V); it does not support 3.3V VCC operation. Outputs remain 5V TTL-level, requiring level translation if interfacing with 3.3V-only receivers.

Is the 25Ω series resistor present on all output pins, and is it usable for impedance matching?

Yes, a 25Ω ±15% series resistor is integrated on every output (O0*–O7*), confirmed in the datasheet's "Features" and "DC Electrical Characteristics" sections. It is optimized for damping reflections on typical FR4 PCB traces (Z₀ ≈ 50–75 Ω) when driving unterminated loads, but is not a precision impedance match for controlled-impedance transmission lines requiring tighter tolerance.