MIC1555BM5 TR Micrel Inc, MIC1555BM5 TR Datasheet

MIC1555BM5 TR

Manufacturer Part Number

MIC1555BM5 TR

Description

IC RC TIMER/OSCILLATOR SOT23-5

Manufacturer

Micrel Inc

Type

555 Type, Timer/Oscillator (Single)r

Series

IttyBitty®r

Datasheet

1.MIC1557YM5_TR.pdf (10 pages)

Specifications of MIC1555BM5 TR

Frequency

5MHz

Voltage - Supply

2.7 V ~ 18 V

Current - Supply

350µA

Operating Temperature

-40°C ~ 85°C

Package / Case

SOT-23-5, SC-74A, SOT-25

# Internal Timers

Operating Supply Voltage (min)

2.7V

Operating Supply Voltage (typ)

3.3/5/9/12/15V

Operating Supply Voltage (max)

18V

Package Type

SOT-23

High Level Output Current

-20mA

Low Level Output Current

20mA

Pin Count

Operating Temp Range

-40C to 85C

Operating Temperature Classification

Industrial

Mounting

Surface Mount

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

Count

Lead Free Status / RoHS Status

Not Compliant, Contains lead / RoHS non-compliant

Other names

MIC1555BM5TR
MIC1555BM5TR

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General Description

The MIC1555 IttyBitty

MIC1557 IttyBitty

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

Typical Application

IttyBitty is a registered trademark of Micrel, Inc.

May 2010

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (

Standby

Trigger

+5V

Monostable (One-Shot)

CMOS RC oscillator are designed to

TRG

GND

MIC1555

CMOS RC timer/oscillator and

OUT

THR

100µs

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

• <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

408

− <1µA typical shutdown mode (MIC1557)

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

) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

Disabled

Enabled

IttyBitty

+5V

MIC1555/1557

Astable (Oscillator)

RC Timer / Oscillator

GND

MIC1557

OUT

T/T

8kHz

0.1µF

M9999-052610-D

Output

Related parts for MIC1555BM5 TR

MIC1555BM5 TR Summary of contents

Page 1

... GND THR Monostable (One-Shot) IttyBitty is a registered trademark of Micrel, Inc. Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 ( May 2010 Features • +2.7V to +18V operation • Low current − <1µA typical shutdown mode (MIC1557) − ...

Page 2

Micrel, Inc. Ordering Information Part Number Standard Pb-Free MIC1555BM5 MIC1555YM5 MIC1557BM5 MIC1557YM5 Note: Under bar ( __ ) may not be to scale. Pin Configuration OUT GND 3 2 T10 4 TRG MIC1555 5-Pin SOT-23 (M) Pin Description Pin Number ...

Page 3

Micrel, Inc. Absolute Maximum Ratings Supply Voltage (V )......................................................+22V S Threshold Voltage ( ....................................+22V THR T/T Trigger Voltage ( ..........................................+22V TGR T/T Lead Temperature (soldering, 10sec.)....................... 300°C Maximum Storage Temperature ................................ 150°C Electrical Characteristics ...

Page 4

Micrel, Inc. Typical Characteristics On Resistance vs. Temperature -40 - 100 TEMPERATURE ( °C) k Factors Times RC 2.0 1.9 1.8 1.7 1.6 f= 1.5 ...

Page 5

Micrel, Inc. Functional Diagram Standby Trigger May 2010 V SUPPLY VS MIC1555 Bias THR <100µs TRG GND MIC1555 Block Diagram with External Components (Monostable Configuration) V SUPPLY VS MIC1557 1M Bias T/T GND ...

Page 6

Micrel, Inc. Functional Description Refer to the block diagrams. The MIC1555/7 provides the logic for creating simple RC timer or oscillator circuits. The MIC1555 has separate THR (threshold) and TRG (trigger) connections for monostable (one-shot) or astable (oscillator) operation. The ...

Page 7

Micrel, Inc. 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 ...

Page 8

Micrel, Inc. The MIC1555 or MIC1557 can be used to construct an oscillator. The frequency of an astable oscillator is where frequency (Hz constant [from Typical Characteristics 1 graph] R ...

Page 9

Micrel, Inc. MOSFET may be driven by a second MIC1555/7, powered by 12V to 15V, to level-shift the input. MIC1555 OFF 3.3V 5 THR 4 TRG ON 1.6V 2 GND Figure 7. Schmitter Trigger Charge-Pump Low-Side MOSFET Drivers A standard ...

Page 10

Micrel, Inc. Package Information MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http:/www.micrel.com The information furnished by Micrel in this data sheet is believed to be accurate and reliable. ...

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