LTC6991HDCB#TRPBF

Programmable Timers And Oscillators Overview

The LTC6991HDCB#TRPBF is a silicon oscillator from the TimerBlox family, designed for long duration timing events. It features a programmable period range of 1.024ms to 9.54 hours (29.1µHz to 977Hz). The output clock period is determined by an internal master oscillator and a programmable frequency divider (NDIV) with eight settings from 1 to 2^21. Frequency is set via a single resistor (RSET), achieving less than 1.5% maximum frequency error. The device operates on a single supply voltage between 2.25V and 5.5V, with supply currents ranging from 55µA to 80µA depending on the clock period.

Programmable Timers And Oscillators Feature Summary

• Programmable period range from 1.024ms to 9.54 hours using one to three resistors
• Less than 1.5% maximum frequency error over temperature
• Output reset function allows truncation of pulses or prevention of oscillation
• CMOS output driver sources/sinks 20mA with configurable polarity

Programmable Timers And Oscillators Applications

• Heartbeat timers
• Watchdog timers
• Intervalometers
• Periodic wake-up calls
• Portable and battery-powered equipment

Programmable Timers And Oscillators Procurement Notes

Verify the specific suffix #TRPBF indicates tape and reel packaging containing 500 pieces. Confirm the HDCB package designation corresponds to the 6-lead (2mm × 3mm) plastic DFN form factor. Ensure the 'H' grade matches the required -40°C to 125°C operating temperature range for the target application environment.

Programmable Timers And Oscillators Selection Notes

Select the LTC6991HDCB variant for industrial temperature ranges (-40°C to 125°C). Use the DIV pin voltage divider to set the NDIV ratio and POL bit. Calculate RSET based on the desired output period using the formula tOUT = NDIV • RSET / 50kΩ • 1.024ms. Ensure RSET tolerance is 0.5% or better for optimal accuracy. Limit capacitance on the SET pin to less than 10pF to minimize jitter.

Programmable Timers And Oscillators Part Context

This component belongs to the Analog Devices TimerBlox family of versatile silicon timing devices. The LTC6991 series includes variants with different temperature grades (C, I, H, MP) and packages (SOT-23, DFN). The HDCB suffix specifically denotes the 6-lead DFN package, while the 'H' indicates the extended temperature rating suitable for harsh environments.

Programmable Timers And Oscillators Replacement Considerations

Direct replacements within the same family include LTC6991IDCB#TRPBF for commercial temperature range or LTC6991MPDCB#TRPBF for military temperature range. Package-compatible alternatives in SOT-23 include LTC6991IS6#TRPBF or LTC6991HS6#TRPBF, provided the footprint change is acceptable.