VersaClock® 3S Programmable Clock Generator

The 5L35021 is a VersaClock programmable clock generator and is designed for low power, consumer, and high performance PCI Express applications. The 5L35021 device is a three PLL architecture design, and each PLL is individually programmable and allowing for up to five unique frequency outputs.
The 5L35021 has built-in unique features such as Proactive Power Saving (PPS), Performance-Power Balancing (PPB), Overshot Reduction Technology (ORT) and Extreme Low Power DCO. An internal OTP memory allows the user to store the configuration in the device without programming after power up, then program the 5L35021 again through the I2C interface.

The device has programmable VCO and PLL source selection to allow the user to do power-performance optimization base on the application requirements. It also supports one single-ended output and two pair of differential outputs that support LVCMOS and LPHCSL. A Low Power 32.768kHz clock is supported with only less than 2μA current consumption for system RTC reference clock.


  • Configurable OE pin function as OE, PD#, PPS or DFC control function
  • Configurable PLL bandwidth/minimizes jitter peaking
  • PPS: Proactive Power Saving features save power during the end device power down mode
  • PPB: Performance- Power Balancing feature allows minimum power consumption base on required performance
  • DFC: Dynamic Frequency Control feature allows up to 4 difference frequencies switch dynamically
  • Features <65µA ultra-power-down
  • Outputs: 1MHz to 125MHz
  • Spread Spectrum clock support to lower system EMI
  • I2C interface
  • Supported by IDT Timing Commander™  software tool

Product Options

Choose from the options below, or use the Custom Part Configuration Utility.
Orderable Part ID Part Status Pkg. Code Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
5L35021-000NDGI Active NDG20P2 VFQFPN 20 I Yes Tray
5L35021-000NDGI8 Active NDG20P2 VFQFPN 20 I Yes Reel

Product Comparison

5L35021 5L35023 5P35021 5P35023
Outputs (#) 5 7 5 7
Core Voltage (V) 1.8 1.8 3.3 3.3
Output Voltage (V) 1.8 1.8 1.8, 2.5, 3.3 1.8, 2.5, 3.3
Pkg. Dimensions 3.0 x 3.0 x 1.0 4.0 x 4.0 x 0.9 3.0 x 3.0 x 1.0 4.0 x 4.0 x 0.9

Technical Documentation

Title Other Languages Type Format File Size Date
Datasheets & Errata
5L35021 Datasheet Datasheet PDF 536 KB Nov 29, 2017
User Guides & Manuals
Timing Commander Installation Guide Guide PDF 497 KB Oct 6, 2013
Application Notes & White Papers
AN-909 PCB Layout Considerations for Designing IDT VersaClock 3S, 5 and 6 Clock Products Application Note PDF 743 KB Jul 1, 2016
AN-918 Programmable Clocks vs Crystal Oscillators Application Note PDF 221 KB Mar 9, 2016
AN-891 Driving LVPECL, LVDS, CML, and SSTL Logic with IDT's "Universal" Low-Power HCSL Outputs Application Note PDF 354 KB Dec 10, 2015
AN-846 Termination - LVDS Application Note PDF 50 KB May 12, 2014
AN-845 Termination - LVCMOS Application Note PDF 62 KB May 12, 2014
AN-844 Termination - AC Coupling Clock Receivers Application Note PDF 82 KB May 12, 2014
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 403 KB May 11, 2014
AN-815 Understanding Jitter Units Application Note PDF 476 KB Apr 23, 2014
AN-806 Power Supply Noise Rejection Application Note PDF 353 KB Jan 14, 2014
AN-808 PCI Express/HCSL Termination Application Note PDF 54 KB Jan 14, 2014
Timing Solutions Products Overview Overview PDF 4.11 MB Oct 31, 2018
VersaClock Family Overview 日本語 Overview PDF 180 KB Jan 9, 2018
IDT Clock Generation Overview 日本語 Overview PDF 1.83 MB Apr 28, 2016
IDT Clock Distribution Overview 日本語 Overview PDF 3.79 MB Apr 24, 2016
IDT Clocks for Altera's Stratix V and Arria V/X FPGAs Technical Brief PDF 238 KB Feb 7, 2016

Software & Tools

Title Other Languages Type Format File Size Date
Timing Commander Installer v1.11.0.15609 Software ZIP 18.58 MB Sep 17, 2018
VersaClock 3S Timing Commander Personality File Software TCP 5.00 MB Jan 30, 2018
5L35021 IBIS Model Model - IBIS ZIP 27 KB May 4, 2017

Evaluation Boards

Part Number Title Sort ascending
EVK5L35021 Evaluation Board for 5L35021 VersaClock 3S
DEV5L35021 5L35021 VersaClock 3S Programmable Clock Development Kit