LTC6909HMS#PBF

Programmable Timers And Oscillators Overview

The LTC6909HMS#PBF is a precision silicon oscillator housed in a 16-lead plastic MSOP package. It provides up to eight synchronized, rail-to-rail clock outputs with configurable phase separation ranging from 45° to 120°. The output frequency is determined by a single external resistor connected between the SET and V+A pins, calculated using the formula fOUT = 20MHz • 10k/(RSET • PH), where PH represents the phase divisor (3–8). The device operates on a single supply voltage between 2.7V and 5.5V, drawing approximately 400µA of supply current. It features optional spread spectrum frequency modulation (SSFM) to improve electromagnetic compatibility.

Programmable Timers And Oscillators Feature Summary

• Generates 1 to 8 synchronized clock outputs with programmable phase shifts via three logic inputs.
• Frequency set by a single external resistor; range spans 12.5kHz to 6.67MHz.
• Includes spread spectrum frequency modulation (SSFM) with selectable rates of fOUT/16, fOUT/32, or fOUT/64.
• Outputs can be held low or configured for high impedance (Hi-Z) states.

Programmable Timers And Oscillators Applications

• Synchronizing multiple switching power supplies and DC/DC converters.
• Providing multiphase clocks for system-on-chip (SoC) designs.
• Distributing reference clocks in industrial control systems.

Programmable Timers And Oscillators Procurement Notes

Verify the suffix 'H' indicates an extended temperature range of –40°C to +125°C. Confirm the '#PBF' designation ensures lead-free compliance and RoHS adherence. Check the specific distributor listing for factory packaging quantities, as tube counts may vary by region. Ensure the ordering information matches the required thermal grade for the target application environment.

Programmable Timers And Oscillators Selection Notes

Select the LTC6909 when multiple synchronized phases are required from a single component. Use the RSET resistor value to define the base master oscillator frequency, keeping it within the 20kΩ to 400kΩ range for optimal accuracy. Choose the appropriate PH pin configuration to determine the number of active outputs and their phase relationships. Consider SSFM requirements for EMI reduction when selecting modulation settings.

Programmable Timers And Oscillators Part Context

This component belongs to the LTC6909 family of silicon oscillators. It serves as a central timing source for applications requiring precise phase alignment across multiple channels. The device replaces discrete crystal oscillator solutions by integrating the oscillator core, dividers, and drivers into a compact surface-mount package.

Programmable Timers And Oscillators Replacement Considerations

Public confirmed substitute part numbers: None listed in verified documentation.