LTC6993MPS6-4#TRMPBF - 33.6s Monostable TimerBlox One-Shot | Analog Devices
MPN: LTC6993MPS6-4#TRMPBF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.5 | $4.50 |
| 10 | $4.05 | $40.50 |
| 100 | $3.6 | $360.00 |
| 500 | $3.24 | $1,620.00 |
| 1,000 | $2.88 | $2,880.00 |
LTC6993MPS6-4#TRMPBF Overview
A monostable multivibrator, commonly called a one-shot, is a sequential logic element that produces a single output pulse of fixed duration in response to a trigger input. It belongs to the broader category of multivibrator circuits within digital logic ICs, which also includes astable (free-running) and bistable (flip-flop) variants. The LTC6993's TimerBlox architecture replaces legacy 555-timer-style discrete designs with a precision silicon solution offering tighter tolerance, lower power, and smaller PCB area, while maintaining the familiar single-resistor programming interface.
Key features include an 11 ns propagation delay, internal master oscillator set by a single external resistor (RSET), CMOS logic outputs, and a separate divider setting (NAD pin) that selects one of eight pulse-width ranges. The retriggerable -4 variant ignores the rising edge and starts the timing cycle on a falling transition at the trigger input, making it well suited for debounce, missing-pulse detection, and watchdog reset circuits where the pulse must be restarted if a new event occurs before completion.
Architecturally, the LTC6993 uses a programmable current source feeding an internal master oscillator whose frequency is set by RSET to a known reference. A divider chain produces eight selectable time bases from 1 microsecond up to 33.6 seconds, and the trigger logic arms the output pulse for one full timing cycle. Output rise and fall times are typically a few nanoseconds, and supply current is approximately 100 to 400 microamps depending on programmed pulse width and output state.
Typical applications include watchdog timers, missing-pulse detectors, switch debouncers, frequency discriminators, one-shot pulse generators, and precision delay lines in industrial control, automotive, and instrumentation systems. In these roles, the LTC6993MPS6-4#TRMPBF delivers reliable timing with single-resistor programming, eliminating the need for external capacitors or trim potentiometers.
When designing with this device, select RSET between 50 kohm and 800 kohm to set the master oscillator, then choose the appropriate NAD setting to land the desired pulse width within the 1 microsecond to 33.6 second range. Always place a 0.1 microfarad decoupling capacitor close to the V+ pin, and ensure the trigger pulse width is shorter than the programmed output pulse to allow retriggering.
Drop-in alternatives for LTC6993MPS6-4#TRMPBF — 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 LTC6993MPS6-4#TRMPBF (same form factor and footprint) — differing in Operating Temperature Range, Package, Propagation Delay, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC6993IS6-4#TRMPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC6993MPS6-2#TRMPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC6993HS6-4#TRMPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC6993MPS6-4#TRPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC6993MPS6-3#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC6993MPS6-4#TRMPBF Maximum Ratings & Electrical Characteristics
| Function | Monostable Multivibrator (One-Shot Pulse Generator) |
| Series | TimerBlox |
| Logic Family | CMOS |
| Supply Voltage (V+) | 2.25 V to 5.5 V |
| Programmable Pulse Width | 1 microsecond to 33.6 seconds |
| Propagation Delay | 11 ns |
| Trigger Edge | Falling-edge sensitive (variant -4) |
| Retriggerable | Yes (variant -4) |
| Number of Elements | 1 |
| Operating Temperature Range | -55C to +125C (Military, MP grade) |
| Package | TSOT-23-6 (S6) |
| Package Size | 2.9 mm x 1.6 mm |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lead-Free | Yes |
| Programming Interface | Single external resistor RSET |
| Number of Pins | 6 |
LTC6993MPS6-4#TRMPBF Pin Configuration
| Pin 1 | V+ — Positive supply voltage (2.25 V to 5.5 V) |
| Pin 2 | GND — Ground |
| Pin 3 | OUT — CMOS output pulse |
| Pin 4 | TRIG — Trigger input (falling-edge sensitive, variant -4) |
| Pin 5 | NAD — Divider setting input (selects one of 8 pulse-width ranges) |
| Pin 6 | RSET — Master oscillator programming resistor (50 kohm to 800 kohm to GND) |
Typical Applications
LTC6993MPS6-4#TRMPBF is suitable for 6 applications: Watchdog Timer / Microcontroller Reset Supervisor, Missing-Pulse Detector, Switch Debouncer / Mechanical Contact Cleaner, Precision Delay Line / Pulse Stretcher, Automotive ECU Fault Latch, Frequency Discriminator / Window Comparator Timer.
Watchdog Timer / Microcontroller Reset Supervisor
The LTC6993MPS6-4#TRMPBF's retriggerable falling-edge trigger makes it an ideal watchdog timer companion to microcontrollers. Place the LTC6993 between the MCU's heartbeat GPIO and the reset line so that each falling edge from the MCU restarts the timing window. If the MCU fails to retrigger within the programmed 1 microsecond to 33.6 second window, the LTC6993 output asserts the reset. Compared to a discrete 555 watchdog, the LTC6993 delivers tighter tolerance, smaller PCB area (TSOT-23-6), and lower quiescent current, and the military -55C to +125C grade suits automotive and aerospace environments.
Recommended
Missing-Pulse Detector
The retriggerable nature of the LTC6993MPS6-4#TRMPBF enables missing-pulse detection in industrial automation and motor-control systems. Wire the periodic input pulse train to the TRIG pin; if a pulse is missing, the LTC6993 stops receiving retriggers and its output transitions low after the programmed pulse width, signaling a fault to the system controller. The 11 ns propagation delay ensures accurate timing even at high pulse rates, and the 2.25 V to 5.5 V supply accepts both 3.3 V and 5 V logic-level signals without level shifters.
Recommended
Switch Debouncer / Mechanical Contact Cleaner
Use the LTC6993MPS6-4#TRMPBF as a one-shot debouncer for mechanical switches and relays. The falling-edge trigger captures the bounce transient on switch closure, and the retriggerable behavior extends the clean output for the duration of the bounce plus a small safety margin (typically 5 to 50 ms). The TSOT-23-6 footprint consumes only 2.9 mm by 1.6 mm of PCB area, fitting easily behind front-panel switches. Compared to RC-debounce networks, the LTC6993 eliminates component drift and provides consistent timing across the full military temperature range.
Recommended
Precision Delay Line / Pulse Stretcher
The LTC6993MPS6-4#TRMPBF generates precise delays from 1 microsecond to 33.6 seconds with single-resistor programming, replacing discrete delay-line circuitry. Use it to stretch narrow trigger pulses into wider logic-compatible outputs for test instrumentation, sonar systems, and laser rangefinders. The 11 ns propagation delay adds minimal uncertainty to the delay budget, and the 8 selectable divider ranges allow fine-tuning across more than seven orders of magnitude of pulse width without changing external capacitors.
Recommended
Automotive ECU Fault Latch
The military-grade -55C to +125C temperature rating of the LTC6993MPS6-4#TRMPBF makes it suitable for under-hood automotive ECU fault-latching circuits, where one-shots capture intermittent sensor faults for later diagnostic readout. The retriggerable -4 logic ensures that repetitive fault events extend the fault-hold interval, preventing premature clearing of intermittent conditions. AEC-Q100 qualification status should be confirmed separately with Analog Devices for direct OEM automotive programs, but the MP temperature grade comfortably covers automotive ambient ranges.
Recommended
Frequency Discriminator / Window Comparator Timer
Pair two LTC6993MPS6-4 one-shots with a comparator to build a frequency-discriminator circuit that flags inputs falling outside an acceptable frequency window. The first LTC6993 sets the minimum-period threshold and the second sets the maximum; retriggerable behavior cleanly handles variable-frequency input signals. The CMOS logic outputs interface directly to FPGAs or MCUs, and the TSOT-23-6 packages keep the entire discriminator in less than 35 mm squared of PCB area.
Recommended
Recommended Products Summary
Engineering reference data for LTC6993MPS6-4#TRMPBF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC6993IS6-4#TRMPBF | LTC6993MPS6-2#TRMPBF | LTC6993HS6-4#TRMPBF | LTC6993MPS6-4#TRPBF | LTC6993MPS6-3#PBF |
|---|---|---|---|---|---|---|
| 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 | Falling | Falling | Rising | Falling | Falling | Falling |
| Retriggerable | Yes | Yes | Yes | Yes | Yes | No |
| Operating Temperature | -55C to +125C (MP) | -40C to +85C (I) | -55C to +125C (MP) | -40C to +125C (H) | -55C to +125C (MP) | -55C to +125C (MP) |
| 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 |
| Programmable Pulse Width | 1 us to 33.6 s | 1 us to 33.6 s | 1 us to 33.6 s | 1 us to 33.6 s | 1 us to 33.6 s | 1 us to 33.6 s |
| Propagation Delay | 11 ns | 11 ns | 11 ns | 11 ns | 11 ns | 11 ns |
| Logic Family | CMOS | CMOS | CMOS | CMOS | CMOS | CMOS |
Key Differentiators
- Military temperature grade in a tiny TSOT-23-6 footprint (vs LTC6993IS6-4#TRMPBF)
- Falling-edge retriggerable trigger logic (vs LTC6993MPS6-3#PBF)
- Single-resistor programmable from 1 microsecond to 33.6 seconds (vs Discrete 555-timer one-shot designs)
Design Notes
Place a 0.1 microfarad X7R ceramic decoupling capacitor as close as possible to the V+ pin (pin 1) of the LTC6993MPS6-4#TRMPBF. The TimerBlox internal oscillator is sensitive to supply transients, and the 11 ns propagation delay can shift several nanoseconds with supply ripple above 50 mV. For battery-powered designs, add a 10 microfarad tantalum or polymer bulk capacitor on the V+ rail to absorb load-step transients from adjacent digital circuitry.
Keep the RSET resistor (pin 6) traces short and away from switching nodes. The RSET resistor programs the internal master oscillator current, and stray capacitance above 5 pF on this node can shift the programmed pulse width by more than 10 percent. Route the NAD pin (pin 5) directly to either V+ or GND or to the output of a digital buffer - do not leave it floating, as the internal pull logic defaults to an undefined divider range.
Do not assume the LTC6993MPS6-4 will reliably extend timing when retrigger pulses arrive during the output pulse if the trigger pulse width is wider than the programmed output pulse. According to the LTC6993 family datasheet, retriggering requires the trigger to return high before the next falling edge - if the trigger stays low, the LTC6993 ignores subsequent falling edges. In noisy environments, add a small RC filter (10 kohm / 100 pF) on the TRIG input to prevent false retriggers from contact bounce or EMI.
Compliance Information
RoHS and REACH compliant per TRMPBF suffix. Not AEC-Q100 qualified - the MP suffix indicates military temperature grade rather than automotive qualification; confirm AEC-Q100 status separately with Analog Devices for automotive OEM programs.
