7
Semiconductor
S72NxxUF
Standard Voltage Detector
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.
S72NxxUF
Marking
N□□
□□:
Detecting Voltage Code
Package Code
SOT-323F
Unit : mm
Outline Dimensions
1.95~2.25
1.20~1.40
0.40 Max.
1.90~2.10
1.30 Typ.
1
3
2
0.90~1.25.
0.16 Max.
KSD-I5D001-000
0.10 Max.
PIN Connections
1. OUT
2. GND
3. Vcc
1
S72NxxUF
Equivalent Circuit Diagram
Vcc
OUT
GND
Maximum ratings
Characteristic
Supply Voltage
Power Dissipation
Output Voltage
Operating Temperature Range
Storage Temperature Range
Symbol
V
CC
P
D
*
V
OUT
T
OPR
T
STG
Ratings
-0.3 ~ +10
200
-0.3 ~ +10
-20 ~ +75
-40 ~ +125
(Ta=25°C)
Unit
V
mW
V
℃
℃
* With PCB(8×8
㎜
Copper Area) at Glass Epoxy Board (t=1.7
㎜,
Area; 20×20
㎜)
Electrical Characteristics
Characteristic
Detecting Voltage
Hysteresis Voltage
Temperature Coefficient
of Detecting Voltage
Low Level Output voltage
Leakage Current When OFF
Circuit current at ON
Circuit current at OFF
Operating Voltage
Output Current at ON I
Output Current at ON II
L→H Transmission delay time
H→L Transmission delay time
V
S
: Standard Detection Voltage
(V
CC
=5V, Ta=25°C)
Symbol
V
S
ΔV
S
V
S
/ΔT
V
OL
I
LEAK
I
CCL
I
CCH
V
OPR
I
OL
I
I
OL
II
t
PLH
t
PHL
Test
Circuit
1
1
1
1
1
1
1
1
1
1
2
2
Test Condition
Min.
* See Table 1
Typ.
Max.
Unit
R
L
=470Ω, V
CC
= L→H→L
R
L
=470Ω, Ta= -20~75℃
R
L
=470Ω, V
CC
= V
S
Min
V
CC
=10V, R
L
=470Ω
V
CC
= V
S
Min
V
CC
= V
S
Max +0.1V
R
L
=4.7
㏀,
V
OL
≤0.4V
R
L
=0Ω, V
CC
= V
S
Min
R
L
=0Ω, V
CC
= V
S
Min,
Ta= -20~75℃
R
L
=4.7
㏀,
C
L
=100
㎊
R
L
=4.7
㏀,
C
L
=100
㎊
40
-
-
-
-
-
-
10
5
-
-
100
±0.01
0.1
-
100
1.0
1.4
20
-
100
10
300
-
0.4
0.1
180
2.5
1.6
-
-
500
20
mV
%/℃
V
µA
µA
µA
V
mA
mA
㎲
㎲
KSD-I5D001-000
2
S72NxxUF
Test Circuit 1
Test Circuit 2
Application Circuit
(1) Battery Low Indicator
(2) Resetting for CPU
Note 1.
: Connecting of LED and R2
obtains a voltage drop indicator.
Note 2.
: Connecting of C1 and selection of time constant
with C1 and R1 set the power on delay time.
KSD-I5D001-000
4
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