MIC1557BM5 MICREL [Micrel Semiconductor], MIC1557BM5 Datasheet

MIC1557BM5

Manufacturer Part Number

MIC1557BM5

Description

Manufacturer

MICREL [Micrel Semiconductor]

Datasheet

1.MIC1557BM5.pdf (8 pages)

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General Description

The MIC1555 IttyBitty™ CMOS RC timer/oscillator and

MIC1557 IttyBitty CMOS RC oscillator are designed to pro-

vide 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 (F

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 microsec-

onds 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-lead package,

and is rated for –40 C to +85 C ambient temperature range.

Typical Applications

October 1998

MIC1555/1557

Standby

Trigger

+5V

Monostable (One-Shot)

TRG

GND

MIC1555

OUT

THR

100µs

) pin or an open-

0.1µF

Output

Features

• +2.7V to +18V operation

• Low current

• 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

• <15 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

Ordering Information

Part Number

MIC1555BM5

MIC1557BM5

<1 A typical shutdown mode (MIC1557)

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

Disabled

Enabled

IttyBitty™ RC Timer / Oscillator

+5V

MIC1555/1557

–40 C to +85 C

Temp. Range

Astable (Oscillator)

GND

MIC1557

OUT

T/T

SOT-23-5

Package

8kHz

0.1µF

Output

MIC1555/1557

Marking

T10

T11

Micrel

Related parts for MIC1557BM5

MIC1557BM5 Summary of contents

Page 1

... Charge-pump driver • LED blinker • Voltage converter • Linear sweep generator • Variable frequency and duty cycle oscillator • Isolated feedback for power supplies Ordering Information Part Number MIC1555BM5 MIC1557BM5 100µs 3 Output 1k 5 0.1µF 1 MIC1555/1557 IttyBitty™ RC Timer / Oscillator Temp ...

Page 2

... MIC1555/1557 Pin Configuration Part Number Identification MIC1555BM5 T10 MIC1557BM5 T11 Pin Description Pin Number Pin Number Pin Name MIC1555 MIC1557 MIC1555/1557 OUT GND VS CS GND T10 T11 TRG THR VS SOT-23-5 (M5) Pin Function VS Supply (Input): +2.7 to +18V supply. ...

Page 3

MIC1555/1557 Absolute Maximum Ratings Supply Voltage (V ) .................................................... +22V S Threshold Voltage ( .................................. +22V THR T/T Trigger Voltage ( ....................................... +22V TRG T/T Lead Temperature (soldering 10sec.) ....................... 300 C Electrical Characteristics ...

Page 4

MIC1555/1557 Typical Characteristics (T A Astable Frequency 100 100k 0.1 10k 0.01 0.001 1M 0.0001 FREQUENCY (Hz) On Resistance vs. Temperature -40 - ...

Page 5

MIC1555/1557 Functional Diagrams V SUPPLY VS MIC1555 Bias THR Standby Trigger <100µs TRG GND MIC1555 Block Diagram with External Components (Monostable Configuration) Functional Description Refer to the block diagrams. The MIC1555/7 provides the logic for creating simple ...

Page 6

MIC1555/1557 Application Information Basic Monostable (One-Shot) Circuit A monostable oscillator produces a single pulse each time that it is triggered, and is often referred “one-shot”. The pulse width is constant, while the time between pulses depends on ...

Page 7

MIC1555/1557 To use the MIC1555 as an oscillator, connect TRG to THR. +5V MIC1555 OUT 4 TRG 2 5 GND THR Figure 3. MIC1555 Oscillator Configuration The MIC1557 features a CS input. When logic-low, CS places the ...

Page 8

MIC1555/1557 connected to a higher voltage, through a high-side load. A TTL high signal applied to CS enables a 10kHz oscillator, which quickly develops 15V at the gate of the MOSFET, clamped by a zener diode. A resistor from the ...

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