MIC1557BM5-TR

Programmable Timers And Oscillators Overview

The MIC1557BM5-TR is a CMOS RC oscillator from the IttyBitty family, designed for precise frequency generation. It operates on a +2.7V to +18V supply and features a Chip Select/Reset (CS) input for low-power shutdown with typical current below 1 μA. The device generates a 50% duty cycle square wave using one resistor and one capacitor, supporting frequencies up to 5 MHz. It utilizes a BiCMOS output stage with less than 15 Ω on-resistance and includes threshold input precedence over trigger inputs. The component is rated for an ambient temperature range of –40°C to +85°C.

Programmable Timers And Oscillators Feature Summary

• Low power consumption with <1 μA typical shutdown mode via CS pin
• Rail-to-rail CMOS output with <15 Ω on-resistance
• Timing accuracy from microseconds to hours using external RC components
• Threshold input dominance ensures output remains off when Trigger is high

Programmable Timers And Oscillators Applications

• Micropower Oscillator to 5 MHz
• LED Blinker
• Voltage Converter
• Charge-Pump Driver
• Linear Sweep Generator

Programmable Timers And Oscillators Procurement Notes

Verify that the 'B' suffix in MIC1557BM5-TR corresponds to the standard industrial temperature grade (-40°C to +85°C) as defined by Microchip's product identification system. Confirm the M5 package designation matches the required 5-Lead SOT-23 footprint. Ensure the TR media type indicates a reel quantity of 3,000 units per the datasheet specifications.

Programmable Timers And Oscillators Selection Notes

Select the MIC1557BM5-TR specifically for astable oscillator applications requiring a shutdown feature. Unlike the MIC1555, this model lacks separate trigger and threshold pins, making it unsuitable for monostable configurations. Designers must ensure the timing resistors and capacitors are selected to maintain stability within the specified temperature range and supply voltage limits.

Programmable Timers And Oscillators Part Context

This component belongs to the MIC1555/57 IttyBitty series, which serves as a compact alternative to industry-standard 555 timers. The MIC1557 variant is optimized exclusively for oscillation, distinguishing it from the MIC1555 which supports both monostable and astable modes. The series is characterized by its small SOT-23-5 packaging and low quiescent current.

Programmable Timers And Oscillators Replacement Considerations

MIC1557YM5-TR: Identical functional specifications but housed in a standard SOT-23-5 package instead of the Thin SOT-23-5 associated with the D5 suffix (verify if B implies specific package variation). MIC1555YM5-TR: Compatible for oscillator use if the Chip Select pin is tied to V_S, though it offers additional monostable functionality.