LTC6993IS6-2 - TimerBlox One-Shot Pulse Generator | ADI
MPN: LTC6993IS6-2 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.88 | $5.88 |
| 10 | $5.35 | $53.50 |
| 100 | $4.62 | $462.00 |
| 500 | $4.05 | $2,025.00 |
| 1,000 | $3.55 | $3,550.00 |
LTC6993IS6-2 Overview
A monostable multivibrator (also known as a one-shot) is a sequential logic block that, upon receiving a single trigger edge, produces one output pulse of defined width and then returns to its stable (idle) state. It belongs to the broader family of multivibrators (a family that also includes astable/oscillator circuits and bistable/flip-flop circuits) and is widely used in digital control, instrumentation, and signal-conditioning subsystems. The LTC6993 family sits within Analog Devices' TimerBlox silicon timing platform, which also covers oscillators (LTC6905), low-frequency clocks (LTC6930), and divider/edge-delay blocks.
Key features of the LTC6993IS6-2 include a 2.25 V to 5.5 V supply range, CMOS-compatible inputs, push-pull output stage capable of sourcing/sinking 20 mA, programmable pulse width via a single resistor to ground, retriggerable behavior (sub-version -2), and an extremely low quiescent current of typically 65 µA. The internal master oscillator is factory-trimmed, eliminating the need for external timing capacitors or trim potentiometers. The DIV pin provides four discrete range selections (1 µs, 1 ms, 1 s, 33.6 s) that scale the RSET current.
Typical applications include watchdog timer reset generators, fault-pulse stretchers, switched-mode power supply synchronization, debounce timers for mechanical switches, and pulse-width extension in instrumentation front-ends. In battery-powered designs, the low quiescent current makes it suitable for always-on timing functions. When laying out a board, place RSET close to the SET pin to minimize leakage paths and use a clean ground pour under the part to keep the analog timing reference stable.
Drop-in alternatives for LTC6993IS6-2 — 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 LTC6993IS6-2 (same form factor and footprint) — differing in Function, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC6993IS6-1
✅ Drop-In📋 Reference alternative (not in catalog)
LTC6993IS6-3
✅ Drop-In📋 Reference alternative (not in catalog)
LTC6993IS6-4
✅ Drop-In📋 Reference alternative (not in catalog)
LTC6993CS6-2
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LTC6993HS6-2
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LTC6993MPDS6-2
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LTC6993IS6-2 Maximum Ratings & Electrical Characteristics
| Function | Monostable Multivibrator (One-Shot Pulse Generator) |
| Sub-version Behavior | Retriggerable (-2 suffix) |
| Logic Family | CMOS |
| Supply Voltage Range | 2.25 V to 5.5 V |
| Programmable Pulse Width Range | 1 µs to 33.6 s |
| Propagation Delay (typical) | 11 ns |
| Quiescent Current (typical) | 65 µA |
| Output Drive (source/sink) | ±20 mA (push-pull) |
| Timing Element | Single external resistor RSET (no capacitor) |
| DIV Pin Range Selections | 4 ranges (1 µs / 1 ms / 1 s / 33.6 s base) |
| Trigger Input | CMOS-compatible rising edge on TRIG pin |
| Operating Temperature Range | -40 °C to +85 °C (industrial) |
| Package | TSOT-23-6 (S6) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (Pb-free TRPBF/TRMPBF suffix) |
LTC6993IS6-2 Pin Configuration
| Pin 1 | V+ — Positive supply input (2.25 V to 5.5 V) |
| Pin 2 | GND — Ground |
| Pin 3 | TRIG — Trigger input, rising edge active (retriggerable) |
| Pin 4 | OUT — Push-pull output pulse |
| Pin 5 | DIV — Divider select (connect to V+, GND, or float to choose NDIV) |
| Pin 6 | SET — Timing resistor RSET to ground |
Typical Applications
LTC6993IS6-2 is suitable for 6 applications: Watchdog Timer / MCU Reset Generator, Missing-Pulse Detector, Switched-Mode Power Supply Synchronization, Mechanical Switch Debounce, Pulse-Stretcher for Instrumentation Front-Ends, Battery-Powered Timing Module.
Watchdog Timer / MCU Reset Generator
The LTC6993IS6-2 is well-suited as a hardware watchdog timer in microcontroller designs because its retriggerable behavior holds the output high as long as the host MCU keeps pulsing, and the output drops low only when a trigger is missed. A GPIO pulse from the MCU drives the rising-edge TRIG pin, while the OUT pin feeds the MCU reset line. The 1 µs to 33.6 s programmable pulse width set by a single external RSET resistor lets the designer cover watchdog windows from microseconds (fast loop check) to seconds (slow brown-out guard). Quiescent current is typically 65 µA, so the watchdog draws negligible power even in always-on battery designs, and the 2.25 V to 5.5 V supply range covers single-cell Li-ion through 5 V rails.
Recommended
Missing-Pulse Detector
In a missing-pulse detector the LTC6993IS6-2 retriggerable mode is exactly what is required: every periodic input pulse retriggers the one-shot and keeps OUT high, and the moment a pulse is missed the internal timer counts down and pulls OUT low to flag the fault. The 11 ns propagation delay means the part reacts to the missing pulse within tens of nanoseconds of the expected edge, giving very low fault-detection latency. Pulse width is set by RSET for a window slightly longer than the expected inter-pulse period, and the four DIV ranges cover microsecond-to-second heartbeat rates typical of sensor, motor-control, and instrumentation loops.
Recommended
Switched-Mode Power Supply Synchronization
The LTC6993IS6-2 generates a clean, programmable-width sync pulse that locks a downstream SMPS controller to a defined minimum off-time or maximum on-time. Drive the controller's SYNC or PGOOD pin from OUT and set the pulse width with RSET to enforce a guaranteed blanking interval that protects the power stage from shoot-through. The push-pull output rated at ±20 mA directly drives most SMCS control inputs without buffering, and the wide 2.25 V to 5.5 V supply range lets the part share the same rail as the controller. The retriggerable behavior is useful when the controller generates its own reset pulse during soft-start and you want the timer to extend across those internal events.
Recommended
Mechanical Switch Debounce
Mechanical switches and relays bounce for several milliseconds after actuation, and feeding a bouncing signal directly into a logic input can cause double-clocks or false triggers. The LTC6993IS6-2 cleans up the bouncing waveform by producing a single, glitch-free output pulse of clean width on the first valid rising edge. RSET is chosen for a pulse width longer than the worst-case bounce time (typically 10 ms to 50 ms for small signal relays), and the factory-trimmed internal oscillator keeps the output pulse width stable over temperature. Low 65 µA quiescent current makes the debouncer attractive in portable or remote sensor nodes where power budget is tight.
Recommended
Pulse-Stretcher for Instrumentation Front-Ends
In instrumentation front-ends, a brief analog event (a particle hit, a current-spike, an optical pulse) may be too short to be reliably captured by a microcontroller interrupt or a logic analyzer. The LTC6993IS6-2 stretches that short trigger into a clean digital pulse of RSET-programmed width, typically hundreds of microseconds to milliseconds, that downstream logic can easily sample. The 11 ns propagation delay preserves the original event timing, while the CMOS-compatible trigger input accepts signals directly from a comparator or photodiode amplifier. The 2.25 V to 5.5 V supply and TSOT-23-6 package suit dense, multi-channel data-acquisition PCBs.
Recommended
Battery-Powered Timing Module
Battery-powered designs that need an accurate, capacitor-free timing reference benefit from the LTC6993IS6-2's 65 µA typical quiescent current and 1 µs to 33.6 s programmable pulse width. There is no external timing capacitor, which removes leakage paths and tolerance stack-up that plague traditional 555-based timers on small coin-cell rails. The TSOT-23-6 package occupies only a few square millimeters, and the wide 2.25 V to 5.5 V supply range lets a single part run from a single Li-ion cell or two alkaline cells. The push-pull output can directly drive an enable pin on a load, a FET gate, or a microcontroller interrupt line without extra buffering.
Recommended
Recommended Products Summary
Engineering reference data for LTC6993IS6-2 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC6993IS6-1 | LTC6993IS6-3 | LTC6993IS6-4 | LTC6993CS6-2 | LTC6993HS6-2 |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | TSOT-23-6 | TSOT-23-6 (same) | TSOT-23-6 (same) | TSOT-23-6 (same) | TSOT-23-6 (same) | TSOT-23-6 (same) |
| Trigger Edge | Rising edge | Rising edge | Falling edge | Falling edge | Rising edge | Rising edge |
| Retriggerable | Yes (-2 suffix) | No | No | Yes | Yes | Yes |
| Temperature Grade | -40 °C to +85 °C (industrial) | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | 0 °C to +70 °C | -40 °C to +125 °C |
| Pulse Width Range | 1 µs to 33.6 s | 1 µs to 33.6 s | 1 µs to 33.6 s | 1 µs to 33.6 s | 1 µs to 33.6 s | 1 µs to 33.6 s |
| Propagation Delay (typ) | 11 ns | 11 ns | 11 ns | 11 ns | 11 ns | 11 ns |
| Quiescent Current (typ) | 65 µA | 65 µA | 65 µA | 65 µA | 65 µA | 65 µA |
| Supply Voltage Range | 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 |
Key Differentiators
- Retriggerable behavior with rising-edge TRIG on TSOT-23-6 (vs LTC6993IS6-1)
- Industrial -40 °C to +85 °C temperature grade on TSOT-23-6 (vs LTC6993CS6-2)
- Single-resistor programming, no external timing capacitor (vs SN74LVC1G123)
- Wide 1 µs to 33.6 s pulse width range in one part (vs LTC6908IS6-1)
Design Notes
Place RSET as physically close as possible to the SET pin (pin 6) and route its ground end through a clean ground pour directly under the package. Leakage from a contaminated SET node is the single largest source of pulse-width error in LTC6993 designs; keep flux residue, solder mask creepage, and adjacent high-impedance traces away from this pin. A 100 nF decoupling capacitor on V+ placed within 3 mm of pin 1 is recommended.
The TRIG input (pin 3) is CMOS-compatible with a typical threshold around 0.5 × V+, but it has no internal hysteresis on its own. If the trigger source is noisy or has slow edges (rise time > 100 ns), add a small RC filter (1 kΩ and 100 pF) or a Schmitt-trigger buffer (e.g., 74LVC1G17) in front of TRIG to prevent multiple retriggers from a single intended event. Edge rates faster than 10 V/µs are recommended for reliable one-shot operation.
Do not leave the DIV pin (pin 5) floating when a known NDIV value is required; floating selects a specific divider but is sensitive to board leakage. Tie DIV directly to V+, GND, or to a GPIO with a defined logic level. Also, never connect SET to V+ - the SET pin must source current through RSET to ground; connecting SET to V+ disables timing and can cause unpredictable output behavior. The OUT pin is push-pull and should not be tied directly to another push-pull output without a series resistor.
The supply current of the LTC6993IS6-2 scales with output state - OUT high or low adds a small additional draw beyond the 65 µA quiescent. Estimated: at 3.3 V V+ and OUT driving 5 pF load at 1 kHz, average supply current rises to roughly 80 µA. For battery-powered designs, place the part in its idle (OUT low) state for the majority of the duty cycle and gate its V+ with a load switch only when an active timer pulse is required.
Compliance Information
RoHS and REACH compliance indicated by the TRPBF / TRMPBF Pb-free suffix per Analog Devices ordering information. The standard industrial LTC6993IS6-2 is not AEC-Q100 qualified; for AEC-Q100 timing, contact Analog Devices regarding automotive-grade TimerBlox options.
