Diodes Incorporated PI74FCT2827ATQ

Overview

PI74FCT2827ATQ from Pericom Semiconductor is a non-inverting 10-bit bus buffer with dual active-low output enables, built in 0.8 µm CMOS technology. It features 25 Ω series output resistors, TTL-compatible I/O levels, –40°C to +85°C industrial temperature range, and drives high-capacitance loads while presenting low input/output capacitance. It is used in wide address/data bus interfaces requiring noise-suppressed signal integrity.

For engineers reviewing the PI74FCT2827ATQ datasheet, PI74FCT2827ATQ pinout, PI74FCT2827ATQ application, or PI74FCT2827ATQ equivalent, key selection criteria include propagation delay (≤3.8 ns), output enable/disable timing (≤5.0 ns / ≤4.3 ns), 25 Ω integrated termination, dual OE control logic, and QSOP-24 package compatibility with FAST™-series footprints.

Technical Context

The PI74FCT2827ATQ implements a transparent non-inverting buffer architecture with NAND-ed dual output enables (OE1 and OE2), enabling three-state control when either enable is high. Its 25 Ω series output resistors suppress transmission-line reflections without external terminators.

All inputs include hysteresis (200 mV) for noise immunity, and outputs deliver TTL-level VOH ≥2.4 V at –15 mA and VOL ≤0.5 V at 12 mA (25 Ω series mode). Static ICC is ≤500 µA, and dynamic supply current scales with toggling inputs and frequency per validated Icc formula.

Key Specifications

Pinout & Package

PI74FCT2827ATQ is housed in a 24-pin plastic TQSOP (Thin Quad Small Outline Package), 150-mil body width, with standard 0.65 mm lead pitch and gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit non-inverting buffer applications.

Compared with 74F244PC and SN74LVC244APWR, PI74FCT2827ATQ uniquely delivers 5 V TTL compatibility, integrated 25 Ω termination, hysteresis, and sub-4 ns propagation in a single TQSOP-24 package-enabling drop-in upgrades and noise-resilient bus design without layout rework.

Availability

PI74FCT2827ATQ is available at Aetrix Electronics and suitable for memory subsystems, industrial backplanes, legacy bus interfaces, and test equipment requiring stable component supply and long-term obsolescence management.

Supply support for PI74FCT2827ATQ 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 and timing solutions, acquired by Diodes Incorporated in 2016; its FCT logic portfolio remains actively supported and manufactured.

The PI74FCT2827ATQ belongs to the PI74FCT2XXX family-designed specifically for noise-critical 5 V bus buffering in industrial, telecom, and computing infrastructure where reflection suppression and TTL interoperability are essential.

FAQ

Is PI74FCT2827ATQ pin-compatible with 74F244?

Yes-PI74FCT2827ATQ uses the same 24-pin TQSOP footprint and pin assignment as 74F244, including D0–D9, Y0–Y9, OE1/OE2, VCC, and GND. The dual-OE logic matches the 74F244's two independent 4-bit sections but operates as a unified 10-bit function with NAND-ed enable behavior.

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

The 25 Ω resistor is monolithically integrated into each Y0–Y9 output driver to match typical PCB trace impedance (50 Ω single-ended), reducing signal reflections and overshoot without requiring external components. This maintains signal integrity on stubbed or unterminated buses up to 25 MHz.

Can PI74FCT2827ATQ operate at 3.3 V?

No-PI74FCT2827ATQ is specified only for 5.0 V ±5% operation. Its TTL input thresholds (VIH = 2.0 V, VIL = 0.8 V) and output drive strength assume 5 V VCC. Applying 3.3 V will result in undefined logic states, insufficient VOH, and potential functional failure.

How does the dual-OE (OE1 and OE2) logic work?

OE1 and OE2 are NAND-ed internally: outputs Y0–Y9 are enabled only when both OE1 and OE2 are logic LOW. If either is HIGH, all outputs enter high-impedance state. This provides flexible bus arbitration-e.g., one OE can be tied to system reset, the other to local chip select.