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參數(shù)資料
| 型號(hào)： | 83F5886MIC2506BM |
| 英文描述： | IC-SM-HIGH SIDE SWITCH |
| 中文描述： | 集成電路釤高端開(kāi)關(guān) |
| 文件頁(yè)數(shù)： | 1/8頁(yè) |
| 文件大?。?/td> | 127K |
| 代理商： | 83F5886MIC2506BM |
December 1997
10-3
MIC1555/1557
Micrel
10
MIC1555/1557
IttyBitty RC Timer / Oscillator
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
C
) 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 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
Features
+2.7V to +18V operation
Low current
<1
μ
A typical shutdown mode (MIC1557)
200
μ
A typical (TRG and THR low) at 3V supply
Timing from microseconds to hours
TTL compatible inputs and output
“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
Temp. Range
–40
°
C to +85
°
C
–40
°
C to +85
°
C
Package
SOT-23-5
SOT-23-5
Marking
T10
T11
Standby
Trigger
VS
OUT
MIC1555
1
3
GND
2
THR
5
+5V
Output
TRG
4
100μs
1k
0.1μF
Monostable (One-Shot)
8kHz
Enabled
Disabled
VS
CS
MIC1557
4
3
GND
2
+5V
OUT
5
T/T
1
Output
1k
0.1μF
Astable (Oscillator)
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