LTC6991CDCB#TRMPBF

Programmable Timers And Oscillators Overview

The LTC6991CDCB#TRMPBF 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), while NDIV and polarity are configured using resistors on the DIV pin. The device operates on a single supply voltage between 2.25V and 5.5V, drawing 55µA to 80µA depending on the clock period. It includes a reset function to truncate pulses or halt oscillation.

Programmable Timers And Oscillators Feature Summary

• Programmable period range from 1.024ms to 9.54 hours
• <1.5% maximum frequency error over specified temperature range
• Output reset function with configurable polarity
• CMOS output driver sourcing/sinking 20mA
• Operates on 2.25V to 5.5V single supply

Programmable Timers And Oscillators Applications

• Heartbeat timers
• Watchdog timers
• Intervalometers
• Periodic wake-up calls
• Battery-powered equipment

Programmable Timers And Oscillators Procurement Notes

Verify the specific suffix #TRMPBF indicates a 500-unit tape and reel packaging configuration. Confirm the CDCB designation corresponds to the 6-lead DFN package and the C grade specifies the 0°C to 70°C operating temperature range. Ensure compatibility with the required PCB footprint for the 2mm x 3mm plastic DFN housing.

Programmable Timers And Oscillators Selection Notes

Select this component when low-frequency timing accuracy within 1.5% is required without external crystals. Use the RSET resistor to program the base frequency and the DIV pin resistor network to select the division ratio and output polarity. Consider the 500µs typical start-up time and the need for stable supply voltages to maintain frequency stability.

Programmable Timers And Oscillators Part Context

This part belongs to the Analog Devices TimerBlox family of versatile silicon timing devices. It is specifically engineered for applications requiring precise, long-duration timing intervals where traditional RC circuits lack accuracy. The device integrates the oscillator, divider, and output buffer into a compact surface-mount package.

Programmable Timers And Oscillators Replacement Considerations

Direct replacements include other LTC6991 variants such as LTC6991IDCB#TRMPBF or LTC6991HDCB#TRMPBF, which share identical electrical characteristics but differ in specified operating temperature ranges. Package and pinout remain consistent across the DCB variant family.