参数资料
| 型号： | MIC1557YM5 TR |
| 厂商： | Micrel Inc |
| 文件页数： | 1/17页 |
| 文件大小： | 0K |
| 描述： | IC OSC MONO TIMING 5MHZ SOT23-5 |
| 标准包装： | 1 |
| 系列： | IttyBitty® |
| 类型： | 555 型，计时器/振荡器（单路） |
| 频率： | 5MHz |
| 电源电压： | 2.7 V ~ 18 V |
| 电流 - 电源： | 350µA |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | SC-74A，SOT-753 |
| 包装： | 标准包装 |
| 供应商设备封装： | SOT-23-5 |
| 安装类型： | 表面贴装 |
| 产品目录页面： | 1113 (CN2011-ZH PDF) |
| 其它名称： | 576-1055-6 |
MIC1555/1557
IttyBitty
RC Timer/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
March 11, 2014
Revision 6.0
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 web site at: www.micrel.com.
Features
+2.7V to +18V operation
Low current
<1A typical shutdown mode (MIC1557)
200A 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
<15 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
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