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MIC1555YM5

IttyBitty® RC Timer / Oscillator

Micrel 

MIC1555/1557

IttyBitty® RC Timer / Oscillator

General Description

The MIC1555 IttyBitty® CMOS RC timer/oscillator and

MIC1557 IttyBitty® CMOS RC oscillator are designed to

provide rail-to-rail pulses for precise time delay or

frequency generation.

The devices are similar in function to the industry standard

“555”, without a frequency control (FC) pin or an open-

collector discharge (D) pin. The threshold pin (TH) has

precedence over the trigger (TR) input, ensuring that the

BiCMOS output is off when TR is high.

The MIC1555 may be used as an astable (oscillator) or

monostable (one-shot) with separate threshold and trigger

inputs. In the one-shot mode, the output pulse width is

precisely controlled by an external resistor and a capacitor.

Time delays may be accurately controlled from micro-

seconds to hours. In the oscillator mode, the output is

used to provide precise feedback, with a minimum of one

resistor and one capacitor producing a 50% duty cycle

square wave.

The MIC1557 is designed for astable (oscillator) operation

only, with a chip select/reset (CS) input for low power shut-

down. One resistor and one capacitor provide a 50% duty

cycle square wave. Other duty-cycle ratios may be

produced using two diodes and two resistors.

The MIC1555/7 is powered from a +2.7V to +18V supply

voltage.

The MIC1555/7 is available in the SOT-23-5 5-pin

package, and is rated for –40°C to +85°C ambient

temperature range

Features

• +2.7V to +18V operation

• Low current

− <1µA typical shutdown mode (MIC1557)

− 200µA typical (TRG and THR low) at 3V supply

• Timing from microseconds to hours

• “Zero” leakage trigger and threshold inputs

• 50% square wave with one Resistor, 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

Applications

• Precision timer

• Pulse generation

• Sequential timing

• Time-delay generation

• Missing pulse detector

• Micropower oscillator to 5MHz

• Charge-pump driver

• LED blinker

• Voltage converter

• Linear sweep generator

• Variable frequency and duty cycle oscillator

• Isolated feedback for power supplies

Typical Application

+5V

MIC1555

13 VS

OUT

100µs

Output

Standby

Trigger

4 TRG

2 GND

THR 5

1k

0.1µF

Enabled

Disabled

+5V

MIC1557

8kHz

4 VS

OUT 5

Output

3 CS

1k

2 GND

T/T 1

0.1µF

Monostable (One-Shot)

Astable (Oscillator)

IttyBitty is a registered trademark of Micrel, Inc.

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

May 2010

M9999-052610-D

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