MIC1557BM5T&R

更新时间： 2024-11-29 13:11:31

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麦瑞 - MICREL		振荡器模拟波形发生功能信号电路光电二极管
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MIC1557BM5T&R 数据手册

MIC1555/1557

IttyBitty^®RC Timer / Oscillator

General Description

Features

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.

• +2.7V to +18V operation

• Low current

− <1µA typical shutdown mode (MIC1557)

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

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.

• 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

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.

• 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

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

+5V

100µs

8kHz

MIC1555

MIC1557

¹³VS

OUT

Output

OUT

Output

Standby

Trigger

Enabled

Disabled

TRG

GND

THR

GND

T/T

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

M9999-052610-D

May 2010

12 3 4 5 6 7...10

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与MIC1557BM5T&R相关器件

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MIC1557BM5TX	MICROCHIP	获取价格	IC,TIMER,CMOS,TSOP,5PIN,PLASTIC
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MIC1557YM5	MICREL	获取价格	IttyBitty RC Timer / Oscillator
MIC1557YM5TR	MICREL	获取价格	SQUARE; PULSE; RECTANGULAR, 5MHz, TIMER, PDSO5, LEAD FREE, SOT-23, 5 PIN
MIC1557YM5-TR	MICROCHIP	获取价格	SQUARE; PULSE; RECTANGULAR, 5MHz, TIMER, PDSO5
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