Technical datasheet for the Micrel MIC1555 and MIC1557 IttyBitty CMOS RC timer and oscillator devices, covering electrical characteristics and applications.
The document describes the Micrel MIC1555 IttyBitty™ CMOS RC timer/oscillator and the MIC1557 IttyBitty CMOS RC oscillator. These devices are designed to provide rail-to-rail pulses for precise time delay or frequency generation, functioning similarly to the industry standard '555' but without a frequency control pin or an open-collector discharge pin.
The MIC1555 supports both astable (oscillator) and monostable (one-shot) operation with separate threshold and trigger inputs. The MIC1557 is designed for astable operation only, featuring a chip select/reset input for low-power shutdown. Both devices operate from a +2.7V to +18V supply voltage and are available in the SOT-23-5 5-lead package.
| Supply Voltage Range | +2.7V to +18V |
|---|---|
| Operating Temperature Range | -40 °C to +85°C |
| Package Type | SOT-23-5 5-lead package |
| Supply Current (Typical) | <1µA shutdown mode, 200µA active |
| Maximum Astable Frequency | 5 MHz |
The devices operate from a +2.7V to +18V supply voltage.
The devices are rated for an ambient temperature range of –40 °C to +85°C.
The MIC1557 uses a chip select/reset (CS) input to shut down power consumption to less than 1 µA.