LTC6993HS6-4 - Mono Pulse Gen One-Shot 1µs-33.6s | ADI
MPN: LTC6993HS6-4 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.18 | $4.18 |
| 10 | $3.85 | $38.50 |
| 100 | $3.42 | $342.00 |
| 500 | $2.98 | $1,490.00 |
| 1,000 | $2.65 | $2,650.00 |
LTC6993HS6-4 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 in response to a trigger edge, then returns to its stable state until the next trigger. One-shots sit within the broader category of timer ICs and are widely used for pulse stretching, edge-to-level conversion, missing-pulse detection, and digital debouncing. Because timing accuracy is achieved via a single external resistor (RSET) and the part is fully self-contained, one-shots are easier to design with than discrete RC or 555-based equivalents.
Key features of the LTC6993HS6-4 include a wide programmable pulse-width range (1µs to 33.6s) set by RSET, a low 11 ns propagation delay, 2.25 V to 5.5 V single-supply operation, and CMOS-compatible logic inputs/outputs. The device also includes an internal master oscillator derived from RSET, allowing the output pulse duration to be calculated via tOUT = N_DIV × RSET / 50 kΩ × (typical 1.0), enabling precise digital control of pulse width without external capacitors.
The architecture uses a precision current reference feeding an internal master oscillator whose frequency is set by RSET; the resulting clock is divided by a fixed N factor to produce the output pulse. An on-chip comparator triggers on the rising edge of the input, with retrigger capability and an optional reset pin on related family members. This analog-digital hybrid approach yields excellent supply-rejection and temperature stability compared to simple 555 timer designs.
Typical applications include industrial control pulse generation, automotive system timing, watchdog/missing-pulse detectors, debouncing mechanical switches, frequency discriminator circuits, and low-frequency clock generation in test equipment. The wide 1µs to 33.6s range covers most pulse-stretching needs from high-speed digital logic to multi-second industrial timing. The AEC-Q100 grade (H temp range) makes it suitable for automotive applications.
When designing with the LTC6993HS6-4, select RSET between 10 kΩ and 1 MΩ using a low-drift, low-leakage resistor for accuracy, and place it close to the RSET pin to minimize noise pickup. Verify input pulse width is shorter than the programmed output pulse to ensure proper retrigger behavior.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on the manufacturer datasheet alone.
Drop-in alternatives for LTC6993HS6-4 — 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 LTC6993HS6-4 (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)
LTC6993HS6-4#WTRMPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC6993CS6-4#TRMPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC6993MPS6-4#TRMPBF
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.88 / Unit
View Datasheet →LTC6993HS6-4 Maximum Ratings & Electrical Characteristics
| Function | Monostable Multivibrator (One-Shot Pulse Generator) |
| Programmable Pulse Width Range | 1 µs to 33.6 s |
| Propagation Delay | 11 ns (typical) |
| Supply Voltage Range | 2.25 V to 5.5 V |
| Timing Resistor (RSET) Range | 10 kΩ to 1 MΩ |
| Logic Input Compatibility | CMOS-compatible |
| Output Type | Single-ended CMOS push-pull |
| Operating Temperature Range | -40°C to +125°C (H grade, automotive) |
| Temperature Grade | Automotive (AEC-Q100) |
| Package | TSOT-23-6 (6-pin) |
| Mounting Type | Surface Mount |
| MSL Level | 1 (unlimited floor life) |
| RoHS Status | Compliant (#PBF suffix) |
| Series / Family | TimerBlox LTC6993-4 |
LTC6993HS6-4 Pin Configuration
| Pin 1 | GND — Ground reference |
| Pin 2 | TRIG — Trigger input (rising edge initiates pulse) |
| Pin 3 | VDD — Positive supply (2.25 V to 5.5 V) |
| Pin 4 | OUT — CMOS pulse output |
| Pin 5 | RST/RDIV — Reset / divider control (see datasheet) |
| Pin 6 | RSET — External timing resistor to GND (10 kΩ to 1 MΩ) |
Typical Applications
LTC6993HS6-4 is suitable for 6 applications: Missing-Pulse Detector, Switch Debouncer, Automotive Pulse Generator, Industrial Control Pulse Stretcher, Frequency-to-Pulse Converter, Edge-to-Level Converter for FPGA/ASIC.
Missing-Pulse Detector
The LTC6993HS6-4 fits missing-pulse detection in industrial control and automotive sensor monitoring because its 1µs to 33.6s programmable pulse width can be tuned to exceed the maximum expected inter-pulse period. When retriggered by a periodic input, the output stays HIGH; if the input pulses stop, the one-shot times out and the output goes LOW, signaling a fault. The 11 ns propagation delay ensures faults are detected within nanoseconds of the missed edge. The H temperature grade and AEC-Q100 qualification make it suitable for engine control and ABS sensor monitoring. Place RSET between 100 kΩ and 1 MΩ for sub-second windows typical of encoder signals. Companion logic: a window comparator to qualify the output, or a micro-controller GPIO to latch the fault. According to the Analog Devices TimerBlox datasheet, this topology is documented in the missing-pulse detection application section.
Recommended
Switch Debouncer
The LTC6993HS6-4 is well-suited to mechanical switch and relay debouncing because it converts a noisy multi-edge contact closure into a single clean output pulse of user-defined duration. Wire the switch between TRIG and GND via a pull-up, and program the output pulse to 10-50 ms - long enough to mask bounce, short enough to feel responsive. The wide 2.25 V to 5.5 V supply range allows direct connection to 3.3 V or 5 V microcontroller GPIO without level shifting. The CMOS output can directly drive a logic input, opto-isolator, or interrupt pin. The TSOT-23-6 package fits behind the panel-mount switch on dense PCBs. Use a 1% metal-film RSET for stable timing across temperature.
Recommended
Automotive Pulse Generator
The LTC6993HS6-4 in the AEC-Q100 qualified #WTRMPBF variant is ideal for automotive pulse generation in body control modules, ECU wake-up circuits, and lighting controllers. Its -40°C to +125°C operating range covers under-hood and cabin environments, while the 5.5 V absolute maximum survives load-dump transients when paired with proper TVS protection. The 1µs to 33.6s range covers everything from injector pre-drive pulses (sub-millisecond) to lighting fade timers (multi-second). Its small TSOT-23-6 footprint simplifies PCB layout in space-constrained modules. According to Analog Devices, the TimerBlox family's CMOS outputs are robust against automotive electrical environments when properly bypassed.
Recommended
Industrial Control Pulse Stretcher
The LTC6993HS6-4 serves industrial pulse stretching for PLC inputs, encoder signal conditioning, and watchdog timer circuits because its precise digital timing eliminates the calibration drift of discrete RC one-shots. A short input pulse (e.g. from a proximity sensor) can be stretched to a guaranteed minimum width (e.g. 100 µs) that the downstream PLC input reliably samples. The 11 ns propagation delay preserves edge-to-edge alignment in high-speed assembly lines. Wide supply tolerance makes it robust against 24 V industrial bus transients when powered from a regulated 5 V rail. The H temperature grade suits factory-floor enclosures.
Recommended
Frequency-to-Pulse Converter
The LTC6993HS6-4 can implement a frequency discriminator or frequency-to-pulse converter by operating it as a retriggerable one-shot. Each input pulse retriggers the timer; if the input frequency stays above the threshold set by RSET, the output remains continuously HIGH, providing a clean frequency-good flag. If the input frequency falls below threshold, the output falls LOW. This technique is widely used in tachometers, motor-speed interlocks, and clock-quality monitors. The 1 µs minimum pulse width supports input frequencies up to several hundred kHz when RSET is sized appropriately. The TSOT-23-6 package eases integration into motor-control boards.
Recommended
Edge-to-Level Converter for FPGA/ASIC
The LTC6993HS6-4 converts short digital events (e.g. interrupts, comparator trips, one-cycle pulses) into level signals that slow microcontrollers or ASICs can sample reliably. Program the output pulse width to match the host's polling or interrupt latency, ensuring the event is never missed. With 11 ns propagation delay, the LTC6993HS6-4 adds minimal timing skew between input edge and output, preserving causality in high-speed digital systems. It interfaces directly to 2.5 V, 3.3 V, and 5 V logic thanks to its wide 2.25 V to 5.5 V supply range. The TSOT-23-6 package is ideal for placement near FPGA I/O banks on dense boards.
Recommended
Recommended Products Summary
Engineering reference data for LTC6993HS6-4 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC6993IS6-4#TRMPBF | LTC6993HS6-4#WTRMPBF | LTC6993CS6-4#TRMPBF | LTC6993MPS6-4#TRMPBF |
|---|---|---|---|---|---|
| Package | TSOT-23-6 | TSOT-23-6 (same) | TSOT-23-6 (same) | TSOT-23-6 (same) | TSOT-23-6 (same) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Function | Monostable multivibrator | Monostable multivibrator | Monostable multivibrator | Monostable multivibrator | Monostable multivibrator |
| 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 |
| 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 |
| Operating Temperature | -40°C to +125°C | -40°C to +85°C | -40°C to +125°C | 0°C to +70°C | -55°C to +125°C |
| Automotive Grade | AEC-Q100 (H grade) | No (industrial) | Yes (AEC-Q100 #WTRMPBF) | No (commercial) | No (military) |
| Propagation Delay | 11 ns | 11 ns | 11 ns | 11 ns | 11 ns |
Key Differentiators
- Wide 1µs to 33.6s pulse width range set by a single resistor (vs LTC6994HS6-2#TRPBF)
- 11 ns propagation delay enables high-speed pulse stretching (vs Discrete 555 timer)
- AEC-Q100 qualified for automotive designs (vs Industrial-only LTC6993IS6-4#TRMPBF)
Design Notes
Place RSET as close as possible to Pin 6 of the LTC6993HS6-4 with a ground return trace that does not share impedance with switching loads. Use a low-leakage, 1% metal-film resistor (10 kΩ to 1 MΩ) to maintain timing accuracy; carbon-film resistors add 5-10% timing error and temperature drift. Keep the TRIG trace short and away from noisy switching nodes to prevent false triggering from capacitive coupling.
Decouple VDD (Pin 3) with a 0.1 µF ceramic capacitor placed within 2 mm of the pin, and add a 1 µF bulk capacitor on the supply rail. The LTC6993HS6-4 supply range is 2.25 V to 5.5 V; operation above 5.5 V absolute maximum will damage the part. For 12 V or 24 V industrial buses, step down to 5 V or 3.3 V with an LDO before reaching the TimerBlox. Estimated IDD is in the low-mA range; see datasheet for precise figures.
Never leave the RSET pin floating - this causes undefined master oscillator frequency and erratic output pulses. Ensure input trigger pulse width is shorter than the programmed output width for proper retrigger behavior; wider trigger pulses can block subsequent triggers. Do not use RSET values outside 10 kΩ to 1 MΩ as the master oscillator becomes inaccurate. For long pulse widths (>10 s), check that the timing capacitor-equivalent leakage paths on your PCB (RSET to GND) are below the master oscillator's bias current.
Compliance Information
RoHS and lead-free confirmed via #PBF suffix and Analog Devices product page. AEC-Q100 qualified for the H temperature grade (-40C to +125C); order the #WTRMPBF reel variant for full automotive documentation. Halogen-free status not explicitly stated in provided snippets.
