MIC1557YM5-TR

Programmable Timers And Oscillators Overview

The MIC1557YM5-TR is a CMOS RC oscillator from Microchip Technology's IttyBitty series, housed in a 5-lead SOT-23 package. Designed for astable operation only, it generates precise rail-to-rail pulses using a single resistor and capacitor to produce a 50% duty cycle square wave. The device operates on a supply voltage ranging from +2.7V to +18V with a typical supply current of 255 μA at 5V. It features a Chip Select/Reset (CS) input that enables a low-power shutdown mode with less than 1 μA standby current. The output stage provides a maximum sink/source current of 20 mA.

Programmable Timers And Oscillators Feature Summary

• Astable Oscillator Operation: Generates a 50% duty cycle square wave using one resistor and one capacitor.
• Low Power Shutdown: Includes a CS pin for active-low shutdown, reducing supply current to under 1 μA.
• Wide Supply Range: Functional operation supported from +2.7V to +18V.
• High Precision Timing: Offers timing accuracy within 2% and temperature stability better than 0.005%/°C.

Programmable Timers And Oscillators Applications

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

Programmable Timers And Oscillators Procurement Notes

Verify the ordering suffix 'TR' corresponds to the standard 3,000-unit reel quantity specified for the SOT-23 package. Confirm the 'Y' suffix indicates the -40°C to +85°C industrial temperature range. Ensure the component matches the DS20005730B datasheet revision for accurate electrical parameters.

Programmable Timers And Oscillators Selection Notes

Select the MIC1557YM5-TR when monostable functionality is not required, as this variant lacks separate trigger and threshold pins. Use this part if space constraints favor the SOT-23-5 footprint over larger packages. Verify that the application requires an astable-only configuration compatible with the internal T/T connection.

Programmable Timers And Oscillators Part Context

This component belongs to the MIC1555/MIC1557 IttyBitty family, which serves as a compact alternative to industry-standard 555 timers. Unlike the MIC1555, the MIC1557 does not support monostable modes or feature open-collector discharge outputs. It is specifically optimized for continuous oscillation applications requiring minimal external components.

Programmable Timers And Oscillators Replacement Considerations

MIC1557YD5-TR: Identical functional specifications but packaged in a 5-lead Thin SOT-23 (TSOT-23) instead of standard SOT-23.

Programmable Timers And Oscillators FAQ

Can the MIC1557YM5-TR be configured for monostable operation?

No, the MIC1557 is designed exclusively for astable (oscillator) operation. It lacks the separate trigger and threshold inputs required for monostable configurations found in the MIC1555.

How is the shutdown mode activated?

Shutdown is activated by pulling the Chip Select/Reset (CS) pin logic-low. In this state, the supply current drops to less than 1 μA.

What is the maximum operating frequency?

The maximum astable frequency is 5 MHz, achieved with specific external RC values (e.g., RT = 1 kΩ, CT = 47 pF).