KSI-2055-000
1
S72NxxSF
Standard Voltage Detector
7
Description
The function of this low reset Type IC is to accurately reset systems after detecting the supply voltage at the time
of switching power on and instantaneous power off in various CPU and other logic system. Further, this IC, with
its super low consumption current is most suited as a voltage check circuit for a number of products which use
batteries.
Features
Super low current consumption (I
CCL
= 1.0uA Typ.)
High current of output transistor (I
OL
=20mA Typ.)
Hysteresis circuit built in (V
S
=100mV Typ.)
It has on delay function to supplement the constant of outer C and R.
Applications
Reset circuits for microcomputers, CPU and MPU.
Reset circuit for logic circuitry.
Battery voltage check circuit.
Circuit for changing over to backup battery.
Level detecting circuit.
Ordering Information
Type NO.
Marking
Package Code
S72NxxSF
N
SOT-23F
: Detecting Voltage Code
Outline Dimensions
Unit : mm
S
S
e
e
m
m
i
i
c
c
o
o
n
n
d
d
u
u
c
c
t
t
o
o
r
r
PIN Connections
1. OUT
2. GND
3. Vcc
2.40.1
1.60.1
1.
90 BS
C
2.
9
0.
1
0.
4
0.
05
0.
15
0.
05
0~0.
1
0.
9
0.
1
1
2
3
KSI-2055-000
2
S72NxxSF
Equivalent Circuit Diagram
Maximum ratings
(Ta=25
C)
Characteristic Symbol
Ratings
Unit
Supply voltage
Vcc
-0.3 ~ +10
V
Power Dissipation (Package Limitation)
PD *
300
mW
Operating Temperature
Topr
-20 ~ +75
Storage Temperature
Tstg
-40 ~ +125
* With PCB(88 Copper Area) at Glass Epoxy Board (t=1.7 , Area; 2020 )
Electrical Characteristics
(Vcc=5V, Ta=25
C)
Characteristic Symbol
Test
Circuit
Test Condition
Min.
Typ.
Max.
Unit
Detecting Voltage
VS
1
* See Table 1
Hysteresis Voltage
VS
1
RL=470,VCC=LHL
40 100 300 mV
Temperature Coefficient
Of detecting voltage
VS/T
1
RL=470, Ta= -20~75
-
0.01
-
%/
Low Level Output voltage
VOL
1
RL=470, VCC= VS Min
- 0.1 0.4 V
Circuit current at ON
ICCL
1
RL=, VCC= VS Min
- 100 180
A
Circuit current at OFF
ICCH
1
RL=,VCC=VS Max +0.1V
- 1.0 2.5
A
Threshold Operating Voltage
Vopr
1
RL=4.7 , VOL0.4V
- 1.4 1.6 V
Output Current at ON I
IOL 1
1
RL=0, VCC= VS Min
10 20 - mA
Output Current at ON II
IOL 2
1
RL=0, VCC= VS Min ,
Ta= -20~75
5 - - mA
LH Transmission delay time
tPLH 2
RL=4.7 , CL=100
- 100 500
HL Transmission delay time
tPHL 2
RL=4.7 , CL=100
- 10 20
Vcc
OUT
GND
KSI-2055-000
4
S72NxxSF
(1) Battery Low Indicator
(2) CPU Resetting
Test Circuit 2
Application Circuit
(Note)
(1) Connecting of LED and R2 obtains a voltage drop indicator.
(2) Connecting of C1 and selection of time constant with C1 and R1 set the power on delay time.
Test Circuit 1
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