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MIC1555 Oscillator. Datasheet pdf. Equivalent

Part MIC1555
Description IttyBitty RC Timer / Oscillator
Feature MIC1555/1557 IttyBitty® RC Timer/Oscillator General Description The MIC1555 IttyBitty® CMOS RC time.
Manufacture Micrel Semiconductor
Datasheet
Download MIC1555 Datasheet



MIC1555
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 (THR) has
precedence over the trigger (TRG) input, ensuring that the
BiCMOS output is off when TRG is high.
The MIC1555 can 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 and is rated for –40°C to +85°C ambient
temperature range. The MIC1555/7 is available in SOT-23-
5, and thin SOT23-5 5-pin packages. A low profile, ultra-
thin, (UTDFN), version of the MIC1555 (with chip select) is
also available.
Datasheets and support documentation are available on
Micrel’s website at: www.micrel.com.
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
10-pin ultra-thin DFN package (2mm × 2mm × 0.4mm)
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
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
August 12, 2015
Revision 6.1



MIC1555
Micrel, Inc.
Typical Applications
MIC1555/1557
Monostable (One-Shot)
Monostable (with Enable)
August 12, 2015
Astable (Oscillator)
2
Revision 6.1





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