LTC6995IS6-2 - Long-Timer Silicon Oscillator 29.1µHz-977Hz | ADI
MPN: LTC6995IS6-2 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.2 | $4.20 |
| 10 | $3.78 | $37.80 |
| 100 | $3.36 | $336.00 |
| 500 | $2.94 | $1,470.00 |
| 1,000 | $2.55 | $2,550.00 |
LTC6995IS6-2 Overview
A silicon oscillator is a fully integrated timing element that replaces discrete RC or crystal-based oscillators with a trimmed CMOS current source and divider chain. In the broader system hierarchy, the LTC6995 belongs to the silicon oscillator -> programmable timer -> clock and timing IC -> power management and signal chain family of analog mixed-signal building blocks, where it converts a single resistor setting into a precise, low-jitter square wave without external capacitors.
Key features include a master oscillator frequency of 4 MHz internally divided, a single-resistor RSET programming scheme, 2.25 V to 5.5 V supply operation, 135 µA typical quiescent current, and an active-low reset (RST) input (the "-2" suffix variant) that forces the output to a fixed state and clears internal dividers. Frequency accuracy is typically ±1.5% across -40 °C to +85 °C, and the divider chain supports decades from 1 to 9.54 hours via the DIV pin. The TSOT-23-6 footprint occupies just 2.9 mm × 1.6 mm of board area.
Typical applications include industrial watchdog timers, battery-powered sleep/wake circuits, long-duration one-shot pulse generation, retriggerable monostable timing, periodic interrupt generation for microcontrollers, and replacement of electromechanical timing relays. Compared with a 555-based long timer, the LTC6995 eliminates large timing capacitors and offers an order-of-magnitude better stability over temperature.
Designers should choose the RSET resistor to keep the master frequency between 4 kHz and 1 MHz (RSET between 50 kΩ and 800 kΩ) and place a 0.1 µF bypass capacitor close to the V+ pin. To extend the period beyond 9.54 hours, cascade a divider or feed the output into a counter.
This page synthesizes distributor pricing, drop-in alternatives from the TimerBlox family, application recommendations, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for LTC6995IS6-2 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LTC6995IS6-2 (same form factor and footprint) — differing in Function, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC6995IS6-1
✅ Drop-In📋 Reference alternative (not in catalog)
LTC6995MPS6-2
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LTC6995HS6-2
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LTC6995CS6-2
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LTC6993IS6-2
✅ Drop-In✓ In Stock
$3.55 / Unit
View Datasheet →LTC6995IS6-2 Specifications
| Function | Silicon oscillator / long-duration timer |
| Series | TimerBlox |
| Frequency Range | 29.1 µHz to 977 Hz |
| Period Range | 1.024 ms to 9.54 hours |
| Supply Voltage (V+) | 2.25 V to 5.5 V |
| Supply Current (typ) | 135 µA |
| Master Oscillator Frequency | 4 MHz (typical) |
| Programming Method | Single external resistor RSET (50 kΩ-800 kΩ) |
| Divider Range | 1 to 9.54 hours (DIV pin 1-of-8 selector) |
| Reset Input | Active-low RST (LTC6995-2 variant) |
| Output | CMOS square wave |
| Frequency Accuracy | ±1.5% (typical over -40 °C to +85 °C) |
| Operating Temperature | -40 °C to +85 °C |
| Package | TSOT-23-6 (S6) |
| Mounting Type | Surface Mount |
| MSL Level | 1 (unlimited floor life) |
| RoHS Status | Compliant |
| Lead-Free | Yes (#TRPBF suffix) |
LTC6995IS6-2 Pin Configuration
| Pin 1 | GND — Ground |
| Pin 2 | RST — Reset input, active low (LTC6995-2 variant) - forces OUT low and resets divider chain |
| Pin 3 | OUT — CMOS square-wave output |
| Pin 4 | DIV — Divider select - 3-state pin chooses 1 of 8 divider ranges from 1 ms to 9.54 hours |
| Pin 5 | RSET — Master frequency programming resistor to GND (50 kΩ to 800 kΩ) |
| Pin 6 | V+ — Supply voltage input, 2.25 V to 5.5 V |
Typical Applications
LTC6995IS6-2 is suitable for 6 applications: Industrial Watchdog Timer, Battery-Powered Sleep/Wake Circuit, Long-Duration One-Shot Pulse, Periodic Interrupt Generator, Replacement of Timing Relays, Retriggerable Monostable Timing.
Industrial Watchdog Timer
The LTC6995IS6-2 fits industrial watchdog timing because its 9.54-hour maximum period and ±1.5% frequency accuracy allow a microcontroller supervisor to be reset on a multi-hour cadence without drift. With a single RSET resistor the engineer sets the watchdog window between seconds and hours, replacing discrete 555 long-duration circuits that require electrolytic capacitors prone to aging. The TSOT-23-6 footprint and 2.25 V-5.5 V supply align with 3.3 V and 5 V industrial rails. Pair with an MCU supervisor such as the LTC2935 for hierarchical reset.
Recommended
Battery-Powered Sleep/Wake Circuit
The LTC6995IS6-2 is well suited to battery-powered sleep/wake duty cycling because it draws only 135 µA quiescent current and operates from 2.25 V up to 5.5 V, allowing a sensor node to wake periodically from minutes to hours. Unlike a microcontroller RTC, the LTC6995 requires no firmware and no crystal, eliminating standby current of the MCU itself. Its output toggles cleanly enough to gate a DC-DC enable pin or interrupt line, dropping system sleep current to the LTC6995's own 135 µA floor. Pair with the LTC3388 nanopower buck regulator for sub-µA total quiescent.
Recommended
Long-Duration One-Shot Pulse
The LTC6995IS6-2 can generate one-shot pulses up to 9.54 hours wide when the RST pin is held low (forced output state) and released, which resets internal dividers and starts a fresh timing cycle. This makes it a clean replacement for electromechanical timing relays in industrial controls where a wide timing range and small PCB area are required. Period is tuned by a single resistor change — no capacitor selection — improving long-term stability over discrete RC timing. Pair with the LTC4440 gate driver when the pulse must switch a power MOSFET.
Recommended
Periodic Interrupt Generator
The LTC6995IS6-2 functions as a hardware interrupt generator when its OUT pin drives an MCU external interrupt line at a programmed period, freeing firmware timer resources and surviving software lockups. Period range of 1.024 ms to 9.54 hours covers both sub-second sampling and minute-scale housekeeping interrupts without firmware reload. CMOS output levels interface directly to 3.3 V and 5 V MCUs. Pair with the LPC845M301JHI33 Cortex-M0+ MCU or any MCU with an edge-triggered external interrupt.
Recommended
Replacement of Timing Relays
The LTC6995IS6-2 replaces electromechanical and 555-based timing relays in industrial control panels because it eliminates moving parts, electrolytic timing capacitors, and trimming adjustments while shrinking PCB area from cm² to mm². Period is set by a single precision resistor, and ±1.5% frequency accuracy over -40 °C to +85 °C outperforms the typical ±10% RC tolerance. CMOS output drives a logic-level opto or SSR directly. Use the LTC6995MPS6-2 variant for extended-temperature outdoor or automotive under-hood applications.
Recommended
Retriggerable Monostable Timing
The LTC6995IS6-2 implements a retriggerable monostable by feeding its OUT back to the active-low RST input through a delay; each trigger edge restarts the period, extending the output window. This pattern is useful for input debouncing with long time constants, missing-pulse detectors, and watchdog circuits where the timer must continually extend on healthy activity. RSET-only programming keeps component count to three (R_SET, R_RST, C_bypass). Pair with a comparator such as the LT6700 for threshold-qualified retrigger logic.
Recommended
Recommended Products Summary
Engineering reference data for LTC6995IS6-2 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC6995IS6-1 | LTC6995MPS6-2 | LTC6995HS6-2 | LTC6995CS6-2 | LTC6993IS6-2 |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | TSOT-23-6 (S6) | TSOT-23-6 (S6) - same | TSOT-23-6 (S6) - same | TSOT-23-6 (S6) - same | TSOT-23-6 (S6) - same | TSOT-23-6 (S6) - same |
| Function | Silicon oscillator (free-running) | Silicon oscillator (active-high reset) | Silicon oscillator (mil temp) | Silicon oscillator (high-rel temp) | Silicon oscillator (commercial temp) | One-shot pulse generator |
| Period Range | 1.024 ms to 9.54 hours | 1.024 ms to 9.54 hours | 1.024 ms to 9.54 hours | 1.024 ms to 9.54 hours | 1.024 ms to 9.54 hours | 1 µs to 9.54 hours (one-shot pulse width) |
| Reset Polarity | Active-low RST | Active-high RST | Active-low RST | Active-low RST | Active-low RST | Active-high trigger |
| Operating Temperature | -40 °C to +85 °C (I-grade) | -40 °C to +85 °C | -55 °C to +125 °C | -40 °C to +125 °C | 0 °C to +70 °C | -40 °C to +85 °C |
| Supply Voltage | 2.25 V to 5.5 V | 2.25 V to 5.5 V | 2.25 V to 5.5 V | 2.25 V to 5.5 V | 2.25 V to 5.5 V | 2.25 V to 5.5 V |
| Supply Current (typ) | 135 µA | 135 µA | 135 µA | 135 µA | 135 µA | 75 µA |
Key Differentiators
- 9.54-hour maximum period in a TSOT-23-6 package (vs LTC6993IS6-2)
- ±1.5% frequency accuracy over -40 °C to +85 °C (vs Discrete 555 long-duration timer)
- Single-resistor RSET programming vs crystal selection (vs Crystal oscillator modules)
Design Notes
Place a 0.1 µF X7R bypass capacitor within 2 mm of the V+ pin (pin 6) to suppress supply-induced jitter on the 4 MHz master oscillator. Route the RSET node (pin 5) away from switching nodes and noisy digital traces, since stray capacitance couples into the master current source and shifts the programmed frequency. For best accuracy, use a 1% metal-film resistor for RSET; thin-film chip resistors are acceptable but avoid carbon composition which drifts with humidity.
Estimated: choosing RSET outside the 50 kΩ to 800 kΩ datasheet range causes the master oscillator to either saturate or stop, producing no output or a fixed DC level — verify the calculated RSET before soldering. The DIV pin is a 3-state input (LOW, FLOATING, HIGH), not a binary GPIO; driving it to mid-level with a DAC or weak pull-up leaves the divider in an undefined state. Pull RST (pin 2) high (inactive) with at least a 10 kΩ resistor if not actively driven, otherwise floating noise can intermittently reset the divider chain.
The LTC6995 draws up to 135 µA quiescent current continuously; in a battery-powered sleep circuit this dominates total standby current unless the supply itself is gated. Estimate: at 3.0 V and 135 µA, the LTC6995 alone drains about 405 µW continuously; for multi-year battery life, consider gating its supply with a nanopower load switch such as the LTC3388 output. The output stage is CMOS rail-to-rail, so no pull-up resistor is needed on OUT when driving a high-impedance CMOS input.
Compliance Information
RoHS and REACH compliance per Analog Devices product page. Lead-free #TRPBF suffix confirmed at DigiKey. Halogen-free status not stated in verified data; flagged [DATA_NEEDED]. AEC-Q100 not applicable to standard LTC6995IS6-2; H-grade or MP-grade variants exist for high-reliability applications.
