LTC6995HDCB-2

Programmable Timers And Oscillators Overview

The LTC6995HDCB-2 is a silicon oscillator from the TimerBlox family, designed for long duration timing events with a programmable period range of 1.024ms to 9.54 hours (29.1µHz to 977Hz). It operates on a single supply voltage between 2.25V and 5.5V, consuming 55µA to 80µA depending on the clock period. The device features an active-low reset input characteristic of the -2 suffix variant. Frequency is programmed via a single external resistor (RSET) connected to the SET pin, while an internal divider allows eight selectable division ratios. The output provides a 50% duty cycle square wave with CMOS drive capability sourcing or sinking up to 20mA.

Programmable Timers And Oscillators Feature Summary

• Programmable period range from 1.024ms to 9.54 hours using a single RSET resistor
• Active-low reset input (LTC6995-2 variant) with selectable output polarity
• Internal frequency divider offers eight settings (NDIV = 1, 8, 64, 512, 4096, 2^15, 2^18, 2^21)
• Maximum frequency accuracy of ±1.5% over temperature with ±0.005%/°C drift
• CMOS output driver capable of sourcing/sinking 20mA

Programmable Timers And Oscillators Applications

• Power-on reset timers
• Watchdog timers
• Long time one-shot pulse generation
• Periodic wake-up calls in low-power systems
• Heartbeat timers for system monitoring

Programmable Timers And Oscillators Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and temperature grade. The HDCB suffix indicates a 6-lead DFN package. Confirm availability status through authorized distributors as supply conditions may vary. Ensure the selected variant matches the required reset polarity (active-low for -2) and operating temperature range specifications for the target application environment.

Programmable Timers And Oscillators Selection Notes

Select the LTC6995-2 variant when an active-low reset signal is required by the system logic. Calculate the RSET value based on the desired output period and the chosen NDIV setting to minimize supply current. Use precision resistors for RSET to maintain frequency accuracy within specified limits. Ensure the DIV pin voltage divider ratio accurately sets the desired division factor and output polarity bit. Verify that the load capacitance on the OUT pin does not exceed recommended limits to maintain rise/fall times.

Programmable Timers And Oscillators Part Context

The LTC6995HDCB-2 belongs to the Analog Devices TimerBlox family of versatile silicon timing devices. This series includes various oscillators, delay lines, and pulse generators designed for precise timing control with minimal external component count. The -2 designation specifically denotes the version with an active-low reset input, distinguishing it from the -1 variant which uses an active-high reset. The DCB package refers to the 2mm x 3mm 6-lead plastic DFN form factor.

Programmable Timers And Oscillators Replacement Considerations

Direct functional replacements include other LTC6995 variants such as LTC6995IDCB-2 or LTC6995IS6-2, provided the package and temperature grade match the design requirements. Cross-family alternatives like the LTC6990 or LTC6992 offer different timing capabilities but require circuit redesign. Verify pin compatibility and electrical parameters before substitution.