Diodes Incorporated PI74FCT541ATS

Overview

PI74FCT541ATS from Pericom Semiconductor is a non-inverting octal buffer/line driver with 3-state outputs, designed for high-speed bus driving in 5V TTL-compatible systems. It features 25Ω series output resistors to suppress reflections, supports industrial temperature range (–40°C to +85°C), delivers 64mA sink current per output, and achieves 3.8ns max propagation delay at 50pF load.

For engineers reviewing the PI74FCT541ATS datasheet, PI74FCT541ATS pinout, PI74FCT541ATS application, or PI74FCT541ATS equivalent, key selection criteria include output drive strength, input hysteresis for noise immunity, physical pin grouping (inputs on one side, outputs on opposite), and compatibility with FAST™-series logic replacements requiring low ground bounce and quiescent current under 500µA.

Technical Context

The PI74FCT541ATS implements dual active-low 3-state enable inputs (OEA and OEB) controlling eight non-inverting buffered outputs. Its CMOS architecture operates at 5.0V ±5% with TTL-level input thresholds (VIH = 2.0V, VIL = 0.8V) and hysteresis (200mV) on all inputs to reject noise.

Each output integrates a built-in 25Ω series resistor-eliminating external termination-and supports 64mA sink current while maintaining VOL ≤ 0.55V. Propagation delay is specified from input transition to output valid edge (tPLH/tPHL), with output enable/disable times (tPZH/tPHZ) tightly controlled for synchronous bus timing.

Key Specifications

Pinout & Package

PI74FCT541ATS is housed in a 20-pin plastic TSSOP (173 mil wide), designated as package code "L". Pin layout follows functional grouping: all 8 inputs (D0–D7) and both enable inputs (OEA, OEB) are on the left side (pins 1–10), while all 8 outputs (O0–O7) and power pins (VCC, GND) are on the right side (pins 11–20), enabling straight-through PCB routing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74FCT541CTSO and SN74F541N, PI74FCT541ATS provides superior signal integrity via integrated termination, lower static power, and noise-immune inputs-making it optimal for new designs prioritizing reliability over legacy compatibility.

Availability

PI74FCT541ATS is available at Aetrix Electronics and suitable for industrial control panels, telecom line cards, and medical diagnostic equipment requiring stable component supply across extended product lifecycles.

Supply support for PI74FCT541ATS 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 timing solutions, acquired by Diodes Incorporated in 2016; its FCT logic portfolio remains actively supported and manufactured.

The PI74FCT series targets high-speed digital systems needing TTL-compatible logic with enhanced drive, noise immunity, and signal integrity-specifically engineered for bus buffering in industrial, telecom, and computing infrastructure.

FAQ

What is the function of the OEA and OEB pins on PI74FCT541ATS?

OEA and OEB are independent active-low 3-state output enable inputs. OEA controls outputs O0–O3, and OEB controls outputs O4–O7. When either is low, its associated outputs drive; when high, those outputs enter high-impedance state. This allows selective bus segmentation without external logic.

Does PI74FCT541ATS require external pull-up or pull-down resistors on its inputs?

No. Inputs have internal hysteresis and TTL-compatible thresholds, so they reliably interpret logic HIGH (>2.0V) and LOW (<0.8V) without external biasing. Pull-ups are unnecessary unless the system demands defined state during power-up or tri-state conditions.

Can PI74FCT541ATS operate at 3.3V supply voltage?

No. The device is specified only for 5.0V ±5% (4.75V–5.25V). Operation outside this range violates absolute maximum ratings and may cause incorrect logic behavior, excessive ICC, or permanent damage. Use 3.3V-compatible alternatives like 74LVC541 for lower-voltage systems.

How does the 25Ω series resistor affect PCB layout for PI74FCT541ATS?

The integrated 25Ω resistor allows direct connection to unterminated transmission lines up to ~15cm in length without external series resistors. Layout should still place 0.1µF ceramic decoupling capacitors within 5mm of VCC/GND pins and avoid sharp bends near output traces to preserve impedance control.