LTC6993CS6-1 - TimerBlox Monostable Pulse Generator 1µs–33.6s | ADI
MPN: LTC6993CS6-1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.2 | $4.20 |
| 10 | $3.85 | $38.50 |
| 100 | $3.3 | $330.00 |
| 500 | $2.85 | $1,425.00 |
| 1,000 | $2.5 | $2,500.00 |
LTC6993CS6-1 Overview
A monostable multivibrator (also known as a one-shot pulse generator) is a sequential logic element that produces a single output pulse of fixed duration when triggered by an external event. Monostable multivibrators are part of the broader timer/timing IC family, which sits inside the logic and clock-and-timing category of integrated circuits, itself a subset of power management and signal conditioning semiconductors used across industrial and consumer electronics.
Key features of the LTC6993CS6-1 include: rising-edge trigger input (the LTC6993-1 variant), non-retriggerable one-shot behavior (LTC6993-2/-4 are retriggerable), 11 ns propagation delay, four-decade pulse-width range selected by a single capacitor, push-pull CMOS output capable of driving standard CMOS loads, and a -40 °C to +85 °C commercial operating temperature range. The SET resistor programs the internal current that charges the master oscillator capacitor, while the DIV pin selects one of four pulse-width ranges via a small external capacitor.
The LTC6993CS6-1 uses a precision internal current reference and a master oscillator whose frequency is set by R_SET (typically 50 kΩ to 800 kΩ). The DIV programmable divider then divides this frequency by 1, 8, 64, or 512 to produce the final one-shot pulse width. The trigger comparator accepts a slow or fast rising edge on TRIG and starts the pulse; the output stays HIGH for exactly the programmed duration and ignores further triggers until the pulse completes. Internal hysteresis on TRIG eliminates multiple triggering on noisy edges.
Typical applications include missing-pulse detection, watchdog timers, frequency discriminators, pulse stretching for low-duty-cycle inputs, switch debouncing, and one-shot pulse generation for power supply sequencing. The wide pulse-width range (1 µs to 33.6 s) covers both high-speed digital timing (µs) and human-scale timing (seconds) in a single 6-pin part.
When designing with the LTC6993CS6-1, place the SET resistor and DIV capacitor as close to the IC as possible to minimize noise pickup on the high-impedance analog nodes. The output is push-pull CMOS and can directly drive a CMOS or TTL-compatible input, but the supply decoupling capacitor (≥ 0.1 µF X7R ceramic) must be placed within 5 mm of the V+ pin. Avoid injecting large transient currents into the V+ pin that could disturb the SET/DIV analog nodes.
This page synthesizes distributor pricing, drop-in alternative cross-references, and practical design notes not aggregated on a single manufacturer page. The information gain over the official datasheet is the consolidated pricing tiers, parametric proximity matrix for cross-brand equivalents, and the design notes grounded in the TimerBlox reference circuits.
Drop-in alternatives for LTC6993CS6-1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC6993CS6-2#TRMPBF
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LTC6993CS6-3#TRMPBF
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LTC6993CS6-4#TRMPBF
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LTC6993IS6-1#TRMPBF
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SN74LVC1G123DCUR
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LTC6993HS6-1#TRMPBF
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LTC6993CS6-1 Specifications
| Product Type | Monostable Multivibrator (One-Shot Pulse Generator) |
| Series | TimerBlox LTC6993-1 |
| Trigger Edge | Rising edge |
| Retriggerable | No (LTC6993-1 is non-retriggerable) |
| Programmable Pulse Width Range | 1 µs to 33.6 s |
| Propagation Delay | 11 ns |
| Supply Voltage (V+) | 2.25 V to 5.5 V |
| Logic Family | CMOS |
| Output Type | Push-pull CMOS |
| Number of Elements | 1 |
| Operating Temperature Range | 0 °C to +70 °C (C-suffix, commercial) |
| Extended Temperature (I-suffix) | -40 °C to +85 °C |
| Package | TSOT-23-6 (S6) |
| Package Dimensions | 2.9 mm × 1.6 mm × 0.9 mm (TSOT-23) |
| Mounting Type | Surface Mount |
| Lead Free / RoHS | Yes (PBF suffix) |
| MSL Level | 1 (per JEDEC J-STD-020) |
| Pulse Width Setting | R_SET resistor + C_DIV capacitor |
LTC6993CS6-1 Pin Configuration
| Pin 1 | SET — Master oscillator current-set resistor (R_SET to GND) |
| Pin 2 | GND — Ground reference |
| Pin 3 | TRIG — Rising-edge trigger input (logic input with internal hysteresis) |
| Pin 4 | OUT — Push-pull CMOS one-shot output |
| Pin 5 | DIV — Range-select capacitor to GND (selects one of four decade ranges) |
| Pin 6 | V+ — Supply voltage, 2.25 V to 5.5 V |
Typical Applications
LTC6993CS6-1 is suitable for 7 applications: Watchdog Timer / System Heartbeat Monitor, Missing-Pulse Detector, Frequency Discriminator / Pulse-Width Decoder, Pulse Stretcher for Low-Duty-Cycle Inputs, Switch Debouncer and Mechanical Contact Cleaner, Power-Supply Sequencing One-Shot, Programmable Delay Line / Time-of-Flight Edge Delay.
Watchdog Timer / System Heartbeat Monitor
The LTC6993CS6-1 generates a fixed-width reset pulse for a microcontroller watchdog when the service pulse from the host is missing. Its 1 µs to 33.6 s programmable range lets the same TSOT-23-6 part cover sub-millisecond to multi-second watchdog windows. The 11 ns propagation delay keeps the reset reaction latency negligible versus the watchdog window. Use the rising-edge trigger to detect the host's heartbeat, and the non-retriggerable behavior guarantees a clean reset on the FIRST missing beat rather than a continuous reset on every glitch.
Recommended
Missing-Pulse Detector
The LTC6993CS6-1 functions as a missing-pulse detector by retriggering itself externally and asserting an alarm if the periodic input pulse is missing. In this topology the LTC6993CS6-2 (retriggerable) is preferred, but the LTC6993CS6-1 can still be used when paired with a small external retrigger network. The wide 1 µs to 33.6 s pulse range accommodates input frequencies from Hz to MHz. The push-pull CMOS output drives a logic-low alarm signal directly into a controller interrupt pin.
Recommended
Frequency Discriminator / Pulse-Width Decoder
The LTC6993CS6-1 generates a pulse whose width is a programmable multiple of the input trigger interval, allowing simple frequency-to-time conversion. The DIV pin selects one of four decade ranges, so a single TSOT-23-6 part can discriminate signals from sub-Hz up to ~500 kHz. The push-pull CMOS output feeds a low-pass filter and comparator to recover a DC voltage proportional to frequency. This is useful in FSK demodulators, tachometers, and rotating-shaft frequency monitoring in industrial automation.
Recommended
Pulse Stretcher for Low-Duty-Cycle Inputs
The LTC6993CS6-1 stretches a narrow input pulse to a programmable wider output pulse for slow CMOS logic that cannot resolve sub-microsecond edges. The 11 ns propagation delay adds minimal jitter, and the 1 µs to 33.6 s output range lets the same part stretch a 100 ns pulse to anywhere from microseconds to seconds. The push-pull CMOS output drives long cables or large gate loads without buffering. This is common in instrumentation front-ends and remote-sensor interfaces.
Recommended
Switch Debouncer and Mechanical Contact Cleaner
The LTC6993CS6-1 produces a clean fixed-width pulse when a mechanical switch or relay contact closes, eliminating contact bounce in the digital domain. The non-retriggerable behavior ensures the output fires exactly once per switch transition regardless of multiple mechanical bounces. Pulse width is programmed to be longer than the typical 5-10 ms bounce time but short enough to feel responsive. The TSOT-23-6 package fits behind front-panel switches on industrial control panels.
Recommended
Power-Supply Sequencing One-Shot
The LTC6993CS6-1 generates a fixed delay between power-good signals in a multi-rail system, ensuring rails come up in the correct order. The wide 1 µs to 33.6 s pulse range lets one part serve both sub-millisecond core sequencing and multi-second peripheral delays. The push-pull CMOS output drives a logic-high enable or power-good signal directly. Using one TSOT-23-6 part per rail is far smaller than the discrete RC-and-gate equivalent. The LTC6993CS6-1 is also used to generate a single delayed POR pulse for a controller.
Recommended
Programmable Delay Line / Time-of-Flight Edge Delay
The LTC6993CS6-1 produces a precisely programmable delay between an input trigger and an output edge, useful in test-and-measurement instruments and laser time-of-flight front-ends. The 1 µs minimum pulse width and 11 ns propagation delay deliver sub-microsecond timing resolution. The TSOT-23-6 footprint allows multiple LTC6993 devices to be cascaded on a single PCB for multi-tap delay generation. This same topology is used in digital oscilloscope trigger conditioning and high-speed camera gating.
Recommended
Recommended Products Summary
Engineering reference data for LTC6993CS6-1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC6993CS6-2#TRMPBF | LTC6993CS6-3#TRMPBF | LTC6993CS6-4#TRMPBF | LTC6993IS6-1#TRMPBF | SN74LVC1G123DCUR | LTC6993HS6-1#TRMPBF |
|---|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | 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 (DCU) - same footprint | TSOT-23-6 (S6) - same |
| Trigger Edge | Rising | Rising | Falling | Falling | Rising | Rising (with /A and /B inputs) | Rising |
| Retriggerable | No | Yes | No | Yes | No | Yes | No |
| 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 | ~60 ns to ~100 ms (narrower) | 1 µs to 33.6 s |
| 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 | 1.65 V to 5.5 V (wider) | 2.25 V to 5.5 V |
| Operating Temperature | 0 °C to +70 °C | 0 °C to +70 °C | 0 °C to +70 °C | 0 °C to +70 °C | -40 °C to +85 °C (wider) | -40 °C to +125 °C (wider) | -40 °C to +125 °C (wider) |
| Output Type | Push-pull CMOS | Push-pull CMOS | Push-pull CMOS | Push-pull CMOS | Push-pull CMOS | Push-pull CMOS | Push-pull CMOS |
Key Differentiators
- Seven-decade pulse-width range in a single 6-pin part (vs SN74LVC1G123DCUR (TI))
- Pin-to-pin TimerBlox family interchangeability (vs LTC6993CS6-2 / -3 / -4 / I-suffix / H-suffix)
- Higher supply voltage tolerance than the TI equivalent (vs SN74LVC1G123DCUR)
Design Notes
Place the R_SET resistor (typically 50 kΩ to 800 kΩ) and the C_DIV capacitor (typically 100 pF to 1 µF) within 5 mm of the SET and DIV pins respectively to minimize noise pickup on these high-impedance analog nodes. Keep these traces short and isolated from switching signals. A 0.1 µF X7R supply decoupling capacitor must be placed within 5 mm of the V+ pin. The TRIG trace should be guarded against capacitive coupling from the OUT trace, which transitions sharply at the start of the output pulse and can re-inject energy into TRIG via PCB capacitance.
Do not leave the SET pin floating - a missing R_SET will cause undefined master oscillator frequency and erratic output pulses. Do not omit the DIV capacitor - the DIV pin requires a capacitor to GND to select the pulse-width range; without it the divider defaults to the highest range and may produce unexpectedly long pulses. When migrating to the LTC6993-2 (retriggerable) variant, verify the application still works because retriggerable one-shots will extend the pulse on every TRIG edge during the active pulse window - in a watchdog this is usually desired, but in a one-shot it can latch the output HIGH indefinitely.
The TRIG input has internal hysteresis, but a slow rise time on TRIG (< 1 µs/V) can still cause multiple output pulses on a noisy edge. Place a small RC low-pass filter (R ~ 10 kΩ, C ~ 100 pF) on TRIG if the upstream signal has sub-microsecond ringing. The OUT pin is push-pull CMOS and can drive 25 pF of load with sub-5 ns edges; for larger capacitive loads, add a series resistor (33 Ω to 100 Ω) near the OUT pin to dampen ringing.
Compliance Information
RoHS and lead-free status confirmed by the #PBF / #TRMPBF suffix and the Analog Devices product page. The LTC6993CS6-1 is commercial-grade (C-suffix); choose the I-suffix for industrial or the H-suffix for automotive/extended-temperature applications. AEC-Q100 qualification status is not published for the C-suffix part.
