R3112x Series
Low Input VD with Delay Function
No.EK-091-091101 CMOS Voltage Detector
The R3112x Series are CMOS-based voltage detector ICs with the built-in output delay circuit, which can operate at low voltage.
The delay time can be set with an external capacitor.
FEATURES
Supply Current (ISS1)·······················Typ. 0.5μA (VDD=-VDET+1V, R3112x15x)
Operating Voltage Range (VDD)······0.7V to 6.0V (Topt=25°C)
Detector Threshold Range (-V
DET
)
·····0.9V to 5.0V
(
internally fixed
)
Output Delay ·································Typ. 100ms delay set with a 0.022μF external
capacitor
Reset Signal···································"L"
Detector Threshold Accuracy ·······± 2%
Temp. coeff. of Detector Threshold
···Typ. ± 100ppm/°C
Two Output Types ··························Nch. Open Drain and CMOS
Packages········································SON1612-6, SC-82AB,
SC-88A, SOT-23-5
BLOCK DIAGRAMS
R3112xxxxA R3112xxxxC
(Nch. open drain output) (CMOS output)
OUT
VDD
Vref
CD
GND
RD
OUT
VDD
Vref
CD
GND
RD
SELECTION GUIDES TIMING CHART
Package Quantity per Reel Part No.
SON1612-6 4,000 pcs R3112D
.
xx
.
1
.
-TR-F
SC-82AB 3,000 pcs R3112Q
.
xx
.
1
.
-TR-F
SC-88A 3,000 pcs R3112Q
.
xx
.
2
.
-TR-F
SOT-23-5 3,000 pcs R3112N
.
xx
.
1
.
-TR-F
.
xx
.
: Specify the detector threshold within the range
0.9V (
.
09
.
) to 5.0V (
.
50
.
) in 0.1V steps.
.
: Select the output type from (
.
A
.
) Nch. open drain or (
.
C
.
) CMOS.
tD
GND
GND
VDDL
-
VDET
+VDET
R3112xxxxA tD
R3112xxxxC
tPHL tPHL
Hysteresis
Detector Th
r
eshold
Release Voltage
Minimum Operati ng
Voltage
Pull-up Voltage
Supply
Voltage
(VDD)
Output
Voltage
(VOUT)
Hysteresis
PACKAGES (Top View) HOW TO DETERMINE DELAY TIME
SON1612-6 SC-82AB SC-88A SOT-23-5
1 2 3
6 5 4
1 2
4 3
1 3
5 4
2
1 3
5 4
2
1 OUT
2 GND
3 CD
4 NC
5 GND
6 VDD
1 VDD
2 GND
3 CD
4 OUT
1 VDD
2 NC
3 GND
4 CD
5 OUT
1 OUT
2 VDD
3 GND
4 NC
5 CD
Letting the capacity of an external capacitor CD (F),
the delay time (tD) is found from the following equation:
t
D=0.69 × 6.5 × 106 × CD (s)
APPLICATIONS
Microcontroller and logic circuit reset
Battery checker
Window comparator
Wave shaping circuit
Battery back-up circuit
Power failure detector
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