Document
7
Semiconductor
S72Nxx
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 (ICCL = 1.0uA Typ.) • High current of output transistor (IOL=20mA Typ.) • Hysteresis circuit built in (△VS=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. S72Nxx Marking S72N□□
□□: Detecting Voltage Code
Package Code TO-92 Unit : mm
Outline Dimensions
4.5±0.1 4.5±0.1 3.45±0.1 2.25±0.1
0.4±0.02 14.0±0.40
2.06±0.1
2.54 Typ.
1.27 Typ.
1 2 3
1.20±0.1
PIN Connections 1. OUT 2. Vcc 3. GND
0.38
KSI-9046-000
1
S72Nxx
Equivalent Circuit Diagram
Vcc
OUT
GND
Maximum ratings
Characteristic Supply voltage Power Dissipation (Package Limitation) Operating Temperature Storage Temperature Symbol Vcc PD Topr Tstg Ratings -0.3 ~ +10 500 -20 ~ +75 -40 ~ +125
(Ta=25°C) Unit V mW ℃ ℃
(Vcc=5V, Ta=25°C)
Electrical Characteristics
Characteristic
Detecting Voltage Hysteresis Voltage Temperature Coefficient Of detecting voltage Low Level Output voltage Circuit current at ON Circuit current at OFF Threshold Operating Voltage Output Current at ON I Output Current at ON II L→H Transmission delay time H→L Transmission delay time
Symbol
VS ΔVS VS/ΔT VOL ICCL ICCH Vopr IOL 1 IOL 2 tPLH tPHL
Test Circuit
1 1 1 1 1 1 1 1 1 2 2
Test Condition
Min.
* See Table 1
Typ.
Max.
Unit
RL=470Ω,VCC=L→H→L RL=470Ω, Ta= -20~75℃ RL=470Ω, VCC= VS Min RL=∞Ω, VCC= VS Min RL=∞Ω,VCC=VS Max +0.1V RL=4.7 ㏀, VOL≤0.4V RL=0Ω, VCC= VS Min RL=0Ω, VCC= VS Min , Ta= -20~75℃ RL=4.7 ㏀, CL=100 ㎊ RL=4.7 ㏀, CL=100 ㎊
40 10 5 -
100 ±0.01 0.1 100 1.0 1.4 20 100 10
300 0.4 180 2.5 1.6 500 20
mV %/℃ V µA µA V mA mA ㎲ ㎲
KSI-9046-000
2
S72Nxx
* Table 1 Electrical Characteristics
Characteristic Symbol Test Circuit Test Condition
S72N45 S72N42 S72N39 S72N36
(Vcc=5V, Ta=25°C) Min.
4.30 4.00 3.70 3.40 3.10 2.90 2.75 2.55 2.35 2.15
Typ.
4.5 4.2 3.9 3.6 3.3 3.1 2.9 2.7 2.5 2.3
Max.
4.70 4.40 4.10 3.80 3.50 3.30 3.05 2.85 2.65 2.45
Unit
Detecting voltage
VS
1
RL=470Ω VCC=H→L VOL≤0.4V
S72N33 S72N31 S72N29 S72N27 S72N25 S72N23
V
KSI-9046-000
3
S72Nxx
Test Circuit 1 Test Circuit 2
Application Circuit (1) Battery Low Indicator (2) CPU Resetting
(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.
KSI-9046-000
4
S72Nxx
Electrical Characteristic Curves
Fig.