Diodes Incorporated PI74FCT241ATQ

Overview

PI74FCT241ATQ 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 built-in 25Ω series output resistors to suppress signal reflections, operates across –40°C to +85°C, delivers 64mA sink current per output, and achieves 3.6ns max propagation delay (–40°C to +85°C, CL = 50pF). It is used in memory address buffering and system clock distribution.

For engineers reviewing the PI74FCT241ATQ datasheet, PI74FCT241ATQ pinout, PI74FCT241ATQ application, or PI74FCT241ATQ equivalent, key selection criteria include its dual active-low enable inputs (OEA/OEB), TTL-level input compatibility, low ground bounce, hysteresis on all inputs, and Q-pack (150 mil wide QSOP) package footprint.

Technical Context

The PI74FCT241ATQ implements two independent 4-bit non-inverting buffers, each controlled by separate 3-state enable inputs: OEA enables outputs OB0–OB3, and OEB enables outputs DB0–DB3. All outputs are TTL-compatible with VOH ≥ 2.4V at IOH = –15mA and VOL ≤ 0.50V at IOL = 12mA (25Ω series termination).

It uses advanced 0.6/0.8µm CMOS technology to achieve speed/power performance superior to bipolar FAST™ logic. Input hysteresis (200mV) improves noise immunity, while low quiescent ICC (≤500µA) and dynamic supply current scaling (ICCD = 0.25mA/MHz) support energy-efficient operation in dense digital systems.

Key Specifications

Pinout & Package

PI74FCT241ATQ is housed in a 20-pin plastic QSOP (Q-pack), 150 mil wide, with standard 0.65mm pitch. Pin numbering follows JEDEC MS-013, with pins 1–10 on bottom row (left to right) and 11–20 on top row (right to left).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74F241N and 74LCX241MTCX, the PI74FCT241ATQ uniquely combines 5V TTL compatibility, integrated 25Ω termination, industrial temperature rating, and sub-4ns propagation delay - making it optimal for robust, high-speed 5V bus interfacing without added components or voltage translation.

Availability

PI74FCT241ATQ is available at Aetrix Electronics and suitable for memory address buffering, system clock distribution, bus isolation interfaces, and legacy peripheral expansion requiring stable component supply and full industrial temperature support.

Supply support for PI74FCT241ATQ 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. Its FCT logic family targeted cost-sensitive, high-reliability 5V digital systems.

The PI74FCT241ATQ belongs to the PI74FCT2XXX series - engineered for high-speed, low-noise 5V bus driving in industrial and communications equipment where TTL compatibility, termination integration, and thermal robustness are critical.

FAQ

What is the function of OEA and OEB on the PI74FCT241ATQ?

OEA and OEB are independent active-low 3-state output enable inputs. OEA controls the state of outputs OB0–OB3, while OEB controls DB0–DB3. When either input is LOW, its associated four outputs drive their respective inputs; when HIGH, those outputs enter high-impedance state. This allows selective activation of two 4-bit data paths without external logic.

Does the PI74FCT241ATQ require external termination resistors?

No. Each output includes a factory-trimmed 25Ω series resistor, optimized to dampen reflections on typical PCB traces with ~50Ω characteristic impedance. This eliminates the need for discrete 25–33Ω resistors in series with outputs, simplifying layout and reducing component count in high-speed 5V bus designs.

Can the PI74FCT241ATQ operate with a 3.3V supply?

No. The PI74FCT241ATQ is specified only for VCC = 5.0V ±5% (4.75V–5.25V). Its TTL-compatible input thresholds (VIH = 2.0V min, VIL = 0.8V max) and internal circuitry are designed for 5V operation. Using 3.3V will result in undefined logic states, insufficient output drive, and potential functional failure.

How does the 200mV input hysteresis improve system reliability?

The 200mV hysteresis widens the input transition window - raising VIH to ≈2.1V and lowering VIL to ≈0.7V - which rejects noise spikes under 200mV amplitude and prevents false triggering from slow-rising edges (e.g., from RC-filtered signals or long unterminated cables). This eliminates need for external Schmitt-trigger buffers in marginal signal environments.