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YOBON TECHNOLOGIES
YOBON TECHNOLOGIES


YB1921

3-Pin Microprocessor Reset Monitor



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YB1921 pdf
YB1921
3-Pin Microprocessor Reset Monitor
Introduction
The YB1921 is a cost-effective system
supervisor Integrated Circuit (IC) designed to monitor
VCC in digital and mixed signal systems and provide a
warning signal when the system power supply is out
of working range, and a reset signal to the host
processor when necessary. No external components
are required.
The reset output is driven active within 20μsec
of VCC falling through the reset voltage threshold.
Reset is maintained active for a minimum of 140msec
after VCC rises above the reset threshold. The YB1921
has an active-low RESET output. The output of the
YB1921 is guaranteed valid down to VCC=1V.
The YB1921 is optimized to reject fast transient
glitches on the VCC line. Low supply current of 18μA
(VCC=3.3V) makes these devices suitable for battery
powered applications.
Features
z Precision VCC Monitor for 2.8V, 3.0V, 3.3V,
and 5.0V Supplies
z 140msec Guaranteed Minimum RESET
Output Duration
z RESET Output Guaranteed to VCC=1.0V
z Low 18μA Supply Current
z VCC Transient Immunity
z Small SOT-23 Package
z No External Components
z Wide Operating Temperature: 0°C to 85°C
Applications
z Computers
z Embedded systems
z Battery powered equipment
z Critical µP power supply monitoring
Application Diagram
YB1921
www.yobon.com.tw
1



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YB1921 pdf
Absolute Maximum Ratings (1)
Parameter
Input Voltage
Output Voltage
Input Current
Output Current
Power Dissipation
Output Short Circuit Duration
Thermal Resistance, Junction-to-Ambient
Operating Temperature Range
Lead Temperature (Soldering, 10 sec.)
Junction Temperature
Storage Temperature
YB1921
3-Pin Microprocessor Reset Monitor
Symbol
VCC
RESET
IOUT
PD
ΘJA
TA
TJ
TS
Value
Value
5.5
-0.3 to (Vcc+0.3)
20
20
Internally Limited (3)
Infinite
230
0~85
260
0 to+125
-60 to+150
Unit
V
V
mA
mA
°C/W
°C
°C
°C
°C
Recommended Operating Conditions (2)
Parameter
Symbol
Power Supply Voltage
Junction Temperature
VCC
TJ
Min
2.0
0
Value
Type.
Max
5.5
+125
Unit
V
°C
YB1921
www.yobon.com.tw
2



Part Number YB1921
Description 3-Pin Microprocessor Reset Monitor
Maker YOBON TECHNOLOGIES - YOBON TECHNOLOGIES
Total Page 5 Pages
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