Diodes Incorporated PI49FCT3805DQE

Overview

PI49FCT3805DQE from Diodes Incorporated is a 3.3V non-inverting clock driver IC with two independent 1-input/5-output buffer banks, 3-state output enable (active LOW), and a dedicated monitor output. It delivers 0.5ns typical output skew, supports TTL-compatible inputs and CMOS outputs, and operates across –40°C to +85°C for industrial timing distribution in FPGA, ASIC, and microprocessor clock trees.

For engineers reviewing the PI49FCT3805DQE datasheet, PI49FCT3805DQE pinout, PI49FCT3805DQE application, or PI49FCT3805DQE equivalent, this device is selected for low-skew, dual-bank clock fanout with independent 3-state control and real-time MON signal visibility in space-constrained PCB layouts using QSOP-20 packaging.

Technical Context

The PI49FCT3805DQE implements two isolated 5-output buffer groups, each driven by a single TTL-compatible CMOS input (INA/INB) and controlled by dedicated active-low OE pins (OEA/OEB). Its internal architecture ensures matched propagation paths per bank to achieve ≤0.5ns output skew between same-group outputs.

It features hysteresis on all inputs (150mV), a dedicated MON output replicating INA logic state, and rail-to-rail CMOS output drive capable of sourcing/sinking ≥16mA at VOL ≤0.4V and VOH ≥2.4V under 3.3V supply. Power consumption remains ultra-low: 30µA quiescent current and ≤9.0mA total supply current at 10MHz output toggle rate.

Key Specifications

Pinout & Package

PI49FCT3805DQE is packaged in a 20-pin QSOP (150-mil width), pin-compatible with industry-standard footprint requirements and optimized for automated SMT assembly. The package is Pb-free, RoHS-compliant, and halogen-free per Diodes' Green definition.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar clock fanout applications.

Compared with PI49FCT3805QEX and 74FCT164245CTPAG, the PI49FCT3805DQE provides the lowest skew (0.5ns), fastest guaranteed delay (5.0ns max), and unique MON functionality-making it the optimal choice for precision clock fanout where timing integrity and debug visibility are critical.

Availability

PI49FCT3805DQE is available at Aetrix Electronics and suitable for FPGA clock distribution, industrial PLC timing modules, ASIC SoC reference clock trees, and test equipment signal generators requiring stable component supply, consistent lead times, and long-term lifecycle support.

Supply support for PI49FCT3805DQE 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and integrated circuits, specializing in high-performance, high-reliability components for industrial, computing, and communications markets.

The PI49FCT3805 belongs to Diodes' FCT-family of fast CMOS clock drivers-designed specifically for low-skew, low-power clock distribution in space-constrained, thermally demanding embedded systems.

FAQ

What is the function of the MON pin on PI49FCT3805DQE?

The MON pin is a dedicated monitor output that replicates the logic state of the INA input. It provides real-time visibility into the primary clock input without loading the source signal path, enabling in-system clock health verification during operation or test without requiring external probing.

Can PI49FCT3805DQE drive 50Ω transmission lines directly?

No-it is designed to drive capacitive loads up to 50pF with specified timing and voltage margins. For 50Ω transmission line termination, an external series resistor (typically 33Ω) must be added at the driver output to match impedance and prevent reflections, as confirmed by Diodes' recommended test circuit (CL = 50pF, RL = 500Ω).

Is PI49FCT3805DQE pin-compatible with PI49FCT3806?

Yes-both share identical 20-pin QSOP/SSOP pinouts and power/ground assignments. However, PI49FCT3806 is inverting, so output logic polarity differs; direct substitution requires verification of downstream logic polarity tolerance and truth table alignment.

What does the 'DQE' suffix indicate in PI49FCT3805DQE?

The 'DQE' suffix denotes Diodes' speed grade D (tPLH max = 5.0ns), QSOP-20 package (Q), and Pb-free/Green compliance (E). It corresponds to ordering code PI49FCT3805DQEX, confirming guaranteed performance within industrial temperature range and full RoHS 3 compliance.