Diodes Incorporated PI74FCT374ATQE

Overview

PI74FCT374ATQE from Pericom Semiconductor is an 8-bit octal D-type flip-flop register with buffered common clock and 3-state outputs, designed for data latching and bus interface in digital systems. It features TTL-compatible input/output levels, 5 V supply operation, industrial temperature range (–40°C to +85°C), low static power (0.1 µA typical ICC), and high-speed propagation delay (4.5 ns max at 5 V). It is used in address/data bus buffering and control logic in embedded controllers and communication interfaces.

For engineers reviewing the PI74FCT374ATQE datasheet, PI74FCT374ATQE pinout, PI74FCT374ATQE application, or PI74FCT374ATQE equivalent, key selection criteria include output enable timing (tPZH/tPHZ ≤ 5.5 ns), setup/hold times (tSU = 2.0 ns, tH = 1.0 ns), 3-state drive capability (IOL = 64 mA), and QSOP-20 Pb-free packaging compatibility with legacy FAST™ logic designs.

Technical Context

This device implements eight edge-triggered D flip-flops sharing a single clock (CP) input and a common active-low output enable (OE) control. Data on D0–D7 is captured on the LOW-to-HIGH transition of CP and appears at O0–O7 only when OE is asserted low; otherwise outputs enter high-impedance state. The internal design includes hysteresis on all inputs (200 mV) and low ground bounce outputs for noise immunity in dense PCB layouts.

It operates strictly at 5.0 V ±5% supply, supports TTL-level signaling (VIH = 2.0 V, VIL = 0.8 V), and delivers rail-to-rail output swing (VOH = 2.4 V min at –15 mA, VOL = 0.55 V max at 64 mA). Its quiescent current (0.1 µA typ) and dynamic current scaling (ICCD = 0.25 mA/MHz) make it suitable for low-power digital subsystems requiring deterministic timing and bus isolation.

Key Specifications

Pinout & Package

PI74FCT374ATQE is packaged in a Pb-free, Green-compliant 20-pin QSOP (0.150-inch width), with 0.65 mm lead pitch and JEDEC MO-137AC mechanical outline.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal D register applications.

Compared with 74F374SCX, PI74FCT374ATQE offers 4× lower static power and 45% faster propagation, while SN74ACT374N trades QSOP compactness for broader voltage interoperability - making PI74FCT374ATQE optimal for space-limited, low-power industrial bus nodes.

Availability

PI74FCT374ATQE is available at Aetrix Electronics and suitable for microcontroller bus interfacing, digital I/O expansion, communications backplane buffering, and test equipment signal conditioning requiring stable component supply across extended product lifecycles.

Supply support for PI74FCT374ATQE 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 specializing in high-speed interface, timing, and logic solutions for communications, computing, and industrial markets before its acquisition by Diodes Incorporated in 2016.

The PI74FCT374ATQE belongs to the FCT (Fast CMOS Technology) logic family, engineered for pin-compatible upgrades to bipolar FAST™ devices with superior speed-power trade-offs and robust industrial operation.

FAQ

Is PI74FCT374ATQE compatible with 3.3 V logic systems?

No. PI74FCT374ATQE is a 5 V-only device with TTL-compatible input thresholds (VIH = 2.0 V, VIL = 0.8 V) and 5.0 V ±5% supply requirement. It lacks 3.3 V tolerance and will not operate reliably with 3.3 V supplies or interface directly to 3.3 V logic without level-shifting circuitry.

What is the maximum clock frequency supported by PI74FCT374ATQE?

The device supports clock frequencies up to approximately 100 MHz, derived from its 4.5 ns maximum propagation delay (tPLH/tPHL), 2.0 ns setup time, and 3.0 ns minimum clock pulse width. At 100 MHz, timing margins remain within specification under worst-case industrial conditions (–40°C to +85°C, VCC = 4.75 V).

Does PI74FCT374ATQE require external pull-up resistors on its outputs?

No. The outputs are actively driven to defined HIGH/LOW states when enabled (OE = LOW) and present true high-impedance (not floating) when disabled (OE = HIGH). Pull-ups are unnecessary unless specific bus-keeper or fail-safe biasing is required by system architecture.

Can PI74FCT374ATQE be used in place of PI74FCT374TQE?

Yes - the "A" suffix denotes the advanced speed grade (4.5 ns max tPLH vs. 6.5 ns for "T"), while both share identical pinout, functionality, and QSOP-20 Pb-free packaging. PI74FCT374ATQE provides tighter timing margins and is fully backward-compatible in designs originally specifying the "T" grade.