IDT23S09E-1DCI8

Clock Generators, PLLs, Frequency Synthesizers Overview

The IDT23S09E-1DCI8 is a 3.3V zero delay clock buffer manufactured by Renesas Electronics Corporation, originally developed by Integrated Device Technology (IDT). It features an internal phase-lock loop (PLL) that aligns the phase between the incoming reference clock and output clocks, achieving zero I/O delay. The device distributes one clock input to two banks of outputs: Bank A comprises four pins (CLKA1–4), and Bank B comprises four pins (CLKB1–4), with an additional CLKOUT pin used for internal PLL feedback. It operates within a frequency range of 10MHz to 200MHz at a 3.3V supply voltage.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Zero Delay Buffer: Aligns output clock phase with the reference input using an on-chip PLL.
• Output Configuration: Distributes one input to eight outputs across two independent banks (Bank A and Bank B).
• Low Skew and Jitter: Output-to-output skew is less than 250ps; cycle-to-cycle jitter is under 200ps.
• Spread Spectrum Compatible: Designed to pass through spread spectrum frequency timing generation without filtering.

Clock Generators, PLLs, Frequency Synthesizers Applications

• SDRAM Clock Distribution
• Telecom Systems
• Datacom Applications
• PC Motherboards and Workstations
• Critical Path Delay Designs

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the ordering suffix 'I' confirms the Industrial temperature range (-40°C to +85°C). Confirm the 'DC' suffix indicates the standard drive version in a 16-pin SOIC package. Check for RoHS compliance status as non-green parts had an end-of-life date of May 13, 2010.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when a 3.3V zero delay buffer with 1:8 distribution is required. Ensure the load capacitance matches the operating frequency (<30pF for <100MHz, <10pF for 100-200MHz). For true zero delay, all outputs including CLKOUT must be equally loaded.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part belongs to the IDT23S09E series, which includes variants like the -1H (High Drive) and different packaging options such as TSSOP. It is a 16-pin version derived from the IDT23S05E family. The manufacturer transitioned from IDT to Renesas Electronics Corporation.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Consider checking for IDT23S09E-1HDCI8 if higher drive strength is needed, or IDT23S09E-1DCG/PG variants for alternative packages.

Clock Generators, PLLs, Frequency Synthesizers FAQ

How is zero delay achieved?

Zero delay is achieved by aligning the phase between the incoming clock and the output clock using the internal PLL. The CLKOUT pin provides the feedback signal for the PLL.

What happens if there is no input clock?

In the absence of an input clock, the device enters power down mode. The outputs become tri-stated, and current draw drops below 25µA for the industrial temperature range.

Can the device handle spread spectrum inputs?

Yes, the IDT23S09E is designed to be spread spectrum compatible and will not filter off the spread spectrum feature of the reference input.