Microchip Technology MIC1551/53 IttyBitty® RC Timers/Oscillators
Microchip Technology MIC1551 and MIC1553 IttyBitty® RC 555-Type Timers / Oscillators are ultra-small, high-performance timing solutions designed for space-constrained applications. These devices replicate the functionality of the classic 555 timer using a resistor-capacitor (RC) timing method, offering precision timing in a compact SOT-23-5 package. The MIC1551 can be used as an astable (oscillator) or monostable (one-shot) with separate threshold and trigger inputs. The MIC1553 supports astable (oscillator) operation only, with a chip select/reset (CS) input for low-power shutdown. With a wide 2.7V to 5.5V operating voltage range, low supply current, and fast output response, these Microchip timers / oscillators are well-suited for portable, battery-powered, and timing-critical designs in consumer electronics, industrial control, and instrumentation.
Features
- +2.7V to +18V operation
- Low current
- <1μA typical shutdown mode (MIC1553)
- 200μA typical (TRG and THR low) at 3V supply
- Timing from µs (microseconds) to hours
- “Zero” leakage trigger and threshold inputs
- 50% square wave with one resistor and one capacitor
- Threshold input precedence over trigger input
- <15Ω output on-resistance
- No output cross-conduction current spikes
- <0.005%/°C temperature stability
- <0.055%/V supply stability
- Small SOT-23-5 surface mount package
- -40°C to +85°C operating temperature range
- RoHS compliant
Applications
- Precision timers
- Pulse generation
- Sequential timing
- Time-delay generation
- Missing pulse detectors
- Micropower oscillators up to 500kHz
- Charge-pump drivers
- LED blinkers
- Voltage converters
- Linear sweep generators
- Variable frequency and duty cycle oscillators
Package Types
Typical Application Circuits
Functional Block Diagrams
發佈日期: 2025-05-27
| 更新日期: 2025-06-04