2001. Apr. 4
LOW VOLTAGE DETECTOR WITH OUTPUT DELAY
R3112xxx1A/C Series
s
OUTLINE
The R3112 Series are voltage detector ICs with high detector threshold accuracy and ultra-low
supply current by CMOS process, which can be operated at an extremely low voltage and is used for
system reset as an example.
Each of these ICs consists of a voltage reference unit, a comparator, resistor net for detector
threshold setting, an output driver, a hysteresis circuit, and an output delay circuit. The detector
threshold is fixed with high accuracy internally and does not require any adjustment. Two output types,
Nch open drain type and CMOS type are available.
Two types of packages, SOT-23-5 and ultra small SC-82AB can be selected so that high density
mounting on boards is possible.
s
FEATURES
qBuilt-in
Output Delay Circuit
• • • • • • • • • • •
TYP. 100ms with an external capacitor: 0.022µF
qUltra-low
Supply Current
• • • • • • • • • • •
TYP. 1.0µA (V
DD
=3.5V)
qWide
Range of Operating Voltage
• • • • • •
0.7∼6.0V(Topt=25°C)
qDetector
Threshold
• • • • • • • • •
Stepwise setting with a step of 0.1V in the range of 0.9V to 5.0V
is possible.
qHigh
Accuracy Detector Threshold
• • • • • • •
±2.0%
qLow
Temperature-Drift Coefficient of Detector Threshold
• • • • • • • • •
TYP. ±100ppm/°C
qTwo
Output Types
• • • • • • • • • • • • • • • • • • •
Nch Open Drain and CMOS
qTwo
Types of Packages
• • • • • • • • • •
SOT-23-5 (Mini-mold), SC-82AB
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APPLICATIONS
•
CPU and Logic Circuit Reset
•
Battery Checker
•
Window Comparator
•
Wave Shaping Circuit
•
Battery Back-up Circuit
•
Power Failure Detector
s
BLOCK DIAGRAMS
R3112XXX1A
V
DD
R
D
OUT
R3112XXX1C
V
DD
+
-
Vref
Vref
R
D
+
--
OUT
GND
GND
C
D
C
D
Rev. 1.10
-1-
RICOH [ RICOH ELECTRONICS DEVICES DIVISION ]
