IDT49FCT3805DQI8

Clock Buffers, Drivers Overview

The IDT49FCT3805DQI8 is a 3.3V CMOS dual 1-to-5 clock driver designed for high-speed clock distribution where signal quality and skew are critical. It consists of two independent driver banks, each providing a 1:5 fanout with dedicated 3-state output enable control (OEA, OEB). The device features TTL-compatible inputs and outputs, allowing direct interfacing with 3.3V or 5V components. A 'heartbeat' monitor output (MON) provides diagnostics and PLL driving capability, replicating the input signal characteristics. Built using advanced CMOS technology, it ensures low power consumption while supporting operating frequencies up to 133MHz for the D-grade variant.

Clock Buffers, Drivers Feature Summary

• Dual independent 1:5 fanout clock drivers with separate 3-state output enables
• Guaranteed low skew (<270ps max) and very low propagation delay (<3ns max)
• TTL compatible inputs and outputs; inputs driven by 3.3V or 5V components
• 'Heartbeat' monitor output identical to other outputs for diagnostics

Clock Buffers, Drivers Applications

• High-speed clock distribution systems requiring low skew
• Address distribution networks needing single point-to-point transmission line driving
• PLL driving applications utilizing the monitor output
• Systems requiring diagnostic heartbeat monitoring of clock signals

Clock Buffers, Drivers Procurement Notes

Verify the specific suffix 'DQI8' against manufacturer documentation to confirm package type (QSOP), temperature range (Industrial -40°C to +85°C), and reel packaging details. Ensure compatibility with existing PCB footprints for 20-pin QSOP packages. Check for end-of-life status or discontinuation notices from Renesas/IDT before finalizing procurement plans.

Clock Buffers, Drivers Selection Notes

Select the IDT49FCT3805DQI8 when dual independent clock buffers with 1:5 fanout are required. Choose this part over the E-grade variant if the application frequency does not exceed 133MHz, as the D-grade offers slightly higher propagation delay limits but meets standard industrial requirements. Ensure supply voltage is strictly maintained at 3.3V ± 0.3V for optimal performance and compliance with absolute maximum ratings.

Clock Buffers, Drivers Part Context

This component belongs to the FCT3805 family of 3.3V CMOS clock drivers manufactured by Integrated Device Technology (IDT), now part of Renesas Electronics. The 'D' suffix denotes the Industrial temperature grade (-40°C to +85°C) with a maximum frequency of 133MHz. The 'Q' indicates the Quarter-size Small Outline Package (QSOP), and 'I8' typically specifies the industrial temperature range and tape-and-reel packaging configuration.

Clock Buffers, Drivers Replacement Considerations

Publicly confirmed substitute part numbers for IDT49FCT3805DQI8 are not available in the provided source material. Users should consult official distributor databases or manufacturer cross-reference tools for potential alternatives such as PI49FCT3805 series devices, verifying pinout and electrical parameter compatibility independently.