LTC6993CS6-4 - TimerBlox Monostable Pulse Generator (One-Shot) | ADI
料号： LTC6993CS6-4 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $4.2 | $4.20 |
| 10 | $3.78 | $37.80 |
| 100 | $3.15 | $315.00 |
| 500 | $2.65 | $1,325.00 |
| 1,000 | $2.3 | $2,300.00 |
| 2,500 | $2.05 | $5,125.00 |
LTC6993CS6-4 概述
A monostable multivibrator (also called a one-shot) is a sequential logic block that, on receipt of a single trigger event, produces one output pulse of a defined width and then returns to its stable idle state. Within the broader digital-timing hierarchy, a one-shot sits alongside astable oscillators, counters, and delay lines as a fundamental timing primitive used to convert edges into precisely controlled pulses. The TimerBlox family positions the LTC6993 between simple RC one-shots (poor accuracy) and full microcontroller timer peripherals (high overhead): it provides digital-grade accuracy over a 33,600:1 timing range with no firmware, no crystal, and only one external resistor.
Key features of the LTC6993CS6-4 include a master oscillator accuracy of ±1.5% over voltage and temperature, an internal counter that divides the master frequency by N = 4/64/128/256/512/1024/2048/4096, retrigger capability, a separate rising-edge trigger input, and CMOS-compatible output drive. The device is specified over the commercial 0 °C to 70 °C range; an industrial-grade sibling (LTC6993IS6-4) covers -40 °C to 85 °C. Because the output pulse is generated by digital division of a trimmed master oscillator, pulse-to-pulse jitter is dominated by trigger jitter rather than RC drift, giving far cleaner results than discrete 555-based one-shots.
Typical applications include missing-pulse detection in safety and sensor monitoring, watchdog timer reset generation, frequency-to-pulse conversion, switch de-bouncing, time-of-flight laser or ultrasonic ranging front-ends, and pulse-stretching for narrow event capture. In each case the LTC6993 replaces either a 555 timer (better accuracy, smaller BOM) or a microcontroller capture/compare channel (faster response, no firmware burden).
When designing with this part, select RSET to place the master oscillator in the range that, after the chosen divider N, yields the desired output pulse width; keep the trigger pulse width shorter than the programmed output pulse to guarantee clean retriggering; and place a 0.1 µF decoupling capacitor within 2 mm of the V+ pin to prevent supply transients from disturbing the internal oscillator. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
直接替换替代料： LTC6993CS6-4 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
LTC6993IS6-4#PBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC6993HS6-4#PBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC6993CS6-3#TRMPBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC6993CS6-1#TRMPBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC6993CS6-2#TRMPBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC6993CS6-4 最大额定值与电气特性
| 功能 | Monostable Multivibrator (One-Shot Pulse Generator) |
| Product Family | TimerBlox |
| Variant | LTC6993-4 (retriggerable, rising-edge trigger) |
| Logic Type | Monostable |
| Number of Elements | 1 |
| Supply Voltage (V+) | 2.25 V to 5.5 V |
| Programmable Pulse Width | 1 µs to 33.6 s |
| Master Oscillator Frequency | Set by external RSET resistor |
| Internal Divider (N) | 4 / 64 / 128 / 256 / 512 / 1024 / 2048 / 4096 (DIV pin code) |
| Trigger-to-Output Propagation Delay | 11 ns typical |
| Trigger Edge | Rising edge |
| Retriggerable | Yes (LTC6993-4 retriggers on additional rising edges during output HIGH) |
| 输出类型 | CMOS push-pull |
| Output Drive Current | ±20 mA |
| 工作温度范围 | 0 °C to +70 °C (commercial) |
| 封装 | 6-pin TSOT-23 (S6) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
| Lead-Free Finish | Yes (PBF suffix indicates lead-free) |
LTC6993CS6-4 引脚配置
| 引脚 1 | V+ — Positive supply input, 2.25 V to 5.5 V |
| 引脚 2 | GND — Ground reference |
| 引脚 3 | TRIG — Trigger input (rising-edge for -4 variant); rising edges restart the timing interval on retriggerable models |
| 引脚 4 | DIV — Divider select pin (tri-state / resistor-coded) choosing N = 4/64/128/256/512/1024/2048/4096 |
| 引脚 5 | RSET — External resistor to ground programs the master oscillator frequency |
| 引脚 6 | OUT — CMOS push-pull output, drives ±20 m in parallel |
典型应用
LTC6993CS6-4 适用于 6 应用s: Missing-Pulse Detection, Watchdog Timer Reset Generation, Frequency-to-Pulse Conversion, Switch and Mechanical Contact Debouncing, Time-of-Flight Pulse Generation, Pulse Stretching for Narrow Event Capture.
Missing-Pulse Detection
The LTC6993CS6-4 is ideally suited for missing-pulse detection in sensor monitoring, tachometer feedback, and safety shutdown circuits. In a typical application the retriggerable -4 variant is configured for a pulse width slightly longer than the maximum expected interval between incoming pulses; a normal trigger (rising edge) restarts the timer, but if a trigger is missed, the output transitions and can flag a fault. The 1 µs to 33.6 s programmable range covers rotation-speed monitoring from hundreds of Hz down to sub-Hz signals, while the 11 ns trigger-to-output delay ensures detection latency stays negligible relative to the monitored event. The TSOT-23-6 footprint allows the circuit to fit on a small PCB near the sensor connector, reducing noise pickup on the trigger line. Use a resistor from RSET to ground sized for the chosen DIV setting and add a 0.1 µF decoupling capacitor close to V+.
推荐
Watchdog Timer Reset Generation
In microcontroller-based designs the LTC6993CS6-4 generates a clean reset or interrupt if a periodic "I am alive" service pulse is missed. The retriggerable -4 variant repeatedly extends its output pulse as long as service edges arrive; if the firmware fails to toggle the trigger pin within the programmed window, the output transitions and asserts the reset. Pulse widths from 1 µs to 33.6 s accommodate typical watchdog intervals of 1 ms to 1 s. The 11 ns propagation delay and CMOS output drive (±20 mA) interface directly to most MCU reset inputs without buffering. The TSOT-23-6 package keeps the watchdog footprint under 9 mm², ideal for space-constrained IoT nodes. Decouple V+ with 0.1 µF and choose RSET and DIV to set the watchdog window per the LTC6993 timing equations in the datasheet.
推荐
Frequency-to-Pulse Conversion
The LTC6993CS6-4 can convert an input frequency into a fixed-width pulse per cycle, useful for frequency-to-voltage front-ends, FSK demodulation, and clock-data recovery. Each rising edge on the TRIG pin (for -4 variant) restarts the one-shot and forces the output HIGH for the programmed width; the result is a pulse train of constant width whose duty cycle is directly proportional to input frequency. The digital accuracy of ±1.5% (master oscillator) is far better than discrete RC one-shots, and the 1 µs minimum pulse width supports input frequencies well into the MHz range. Designers can scale the output voltage range by adding a simple RC low-pass filter on the OUT pin, yielding a clean analog voltage proportional to frequency. Use a 100 kΩ RSET with DIV = 4 for short pulses, or DIV = 4096 with a 1 MΩ RSET for sub-Hz pulse generation.
推荐
Switch and Mechanical Contact Debouncing
Mechanical switches, relays, and rotary encoders generate noisy bounce edges lasting 1-20 ms that can confuse digital counters and state machines. The LTC6993CS6-4 with a programmed pulse width of 20-50 ms suppresses bounce by producing one clean rising edge per switch activation, regardless of how many bounces occur during the programmed window. The retriggerable -4 variant extends the output pulse on every bounce, ensuring the output remains stable HIGH for at least the full debounce period; a non-retriggerable variant (-3 or -1) instead ignores mid-pulse triggers, which is preferable when the output must be a fixed pulse per activation. The TSOT-23-6 footprint fits inside a connector housing, and the 2.25 V to 5.5 V supply range allows direct connection to 3.3 V or 5 V logic. Add a 0.1 µF decoupling cap and a series resistor on the TRIG pin for ESD protection.
推荐
Time-of-Flight Pulse Generation
Laser and ultrasonic time-of-flight (ToF) ranging systems require a precisely known START pulse to a detector, with width typically 5-100 ns. The LTC6993CS6-4 with DIV = 4 and a fast RSET (40 kΩ range) generates pulses as short as 1 µs, which combined with an external pulse-sharpening stage (fast comparator or AND-gate with delay line) yields clean 10-50 ns START pulses. The 11 ns trigger-to-output delay is short enough to be a negligible contribution to system timing error. The TSOT-23-6 package allows the START-pulse generator to sit immediately next to the laser driver, minimizing trace-length-induced jitter. A retriggerable variant (-4 or -2) is preferred so that a missed trigger from the host MCU does not leave the laser driver in an undefined state. Decouple V+ aggressively (0.1 µF plus 10 µF bulk) because the laser driver draws large transient currents.
推荐
Pulse Stretching for Narrow Event Capture
Many physics, medical, and radiation-detection instruments produce pulses shorter than 10 ns that are too narrow for a microcontroller to capture without a high-speed capture peripheral. The LTC6993CS6-4 stretches these narrow pulses to microseconds or milliseconds by triggering on the rising edge and producing a programmable-width output pulse that the MCU can sample reliably. The 11 ns trigger-to-output delay and 1 µs minimum pulse width set a maximum stretched-pulse resolution around 90:1, suitable for scintillation pulses, particle detector signals, and short-duration photodiode events. Use the DIV = 4 setting with a low RSET value for minimum pulse width, and pair the OUT pin with an LVDS or CMOS line driver if the signal must travel more than 50 mm on the PCB. Shield the TRIG input with a guard trace if the source is a high-impedance photodiode.
推荐
推荐产品汇总
工程参考数据： LTC6993CS6-4 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | LTC6993IS6-4#PBF | LTC6993HS6-4#PBF | LTC6993CS6-3#TRMPBF | LTC6993CS6-1#TRMPBF | LTC6993CS6-2#TRMPBF |
|---|---|---|---|---|---|---|
| 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 | Monostable one-shot (retriggerable, falling-edge trigger) | Monostable one-shot (retriggerable, falling-edge) | Monostable one-shot (retriggerable, falling-edge) | Monostable one-shot (non-retriggerable, falling-edge) | Monostable one-shot (non-retriggerable, rising-edge) | Monostable one-shot (retriggerable, rising-edge) |
| Trigger Edge | Falling | Falling | Falling | Falling | Rising | Rising |
| Retriggerable | Yes | Yes | Yes | No | No | Yes |
| Operating Temperature Range | 0 °C to +70 °C | -40 °C to +85 °C | -40 °C to +125 °C | 0 °C to +70 °C | 0 °C to +70 °C | 0 °C to +70 °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 |
| Propagation Delay (Trigger to OUT) | 11 ns typical | 11 ns typical | 11 ns typical | 11 ns typical | 11 ns typical | 11 ns typical |
| 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 |
关键差异点
- Retriggerable falling-edge trigger in the same TSOT-23-6 footprint （对比 LTC6993CS6-3#TRMPBF)
- Industrial-grade temperature range for harsh-environment designs （对比 LTC6993IS6-4#PBF)
- 11 ns trigger-to-output propagation delay is one of the fastest in the TimerBlox family （对比 LTC6993CS6-1#TRMPBF)
设计说明
Place a 0.1 µF low-ESR ceramic decoupling capacitor within 2 mm of the V+ pin (pin 1) and an additional 10 µF bulk capacitor on the same supply rail if the LTC6993CS6-4 shares a rail with noisy digital circuitry. The internal oscillator is sensitive to V+ ripple; supply transients above ~50 mV can modulate the master oscillator frequency and add jitter to the output pulse width. For battery-powered applications use a 2.25 V minimum supply and ensure the RSET resistor does not draw more than 1 mA (choose RSET ≥ 50 kΩ at 2.25 V to stay within the oscillator compliance).
Do not leave the DIV pin floating - it must be tied to V+, GND, or to a specific resistor-coded voltage to select one of the eight divider values (N = 4, 64, 128, 256, 512, 1024, 2048, 4096). A floating DIV pin may select an undefined divider or one different from the design intent, resulting in a pulse width 256× or 4096× longer than expected. Per the ADI datasheet, the DIV pin also affects the master-oscillator charge current and must be stable before the part is triggered. Use a 100 kΩ resistor from DIV to V+ or GND as documented in the datasheet's programming tables.
Keep the trace from the TRIG pin (pin 3) short and guarded, especially when the trigger source is a long cable or a high-impedance sensor. The TRIG input has hysteresis (~30 mV typical) but can be susceptible to capacitive coupling from adjacent switching traces. For noisy environments add a 1 kΩ series resistor at the TRIG pin and a 100 pF capacitor to ground to form a low-pass filter that does not slow the 11 ns edge appreciably. Route the OUT pin away from the TRIG pin to avoid feedback coupling that could cause self-triggering.
合规信息
RoHS compliant per ADI product page (#PBF suffix indicates lead-free finish). AEC-Q100 qualification not listed; for automotive applications consult ADI for the H-grade (LTC6993HS6-4) screening level. Halogen-free status not explicitly stated in the verified data.
