＜Analog IC＞

RT8Ｈ172Ｃ

Preliminary＊This is tentative specification
Reset IC with automatic circuit current adjustment

unit：mmOUTLINE DRAWINGDESCRIPTIONThis product has a reset function.

2.80.65

outputs a reset signal.This product has a built-in function that

1.5

an external capacitor, it is possible to set the reset release

2.8

In addition, it has a built-in delay circuit, and by connecting
time.

①172

current of the output stage.

0.95 0.95

automatically adjusts the circuit current according to the load

③The detection voltage can be arbitrarily set with an external

0.65⑥④0.33It detects an abnormality in the power supply voltage and● The miniaturization of a set and high-density mounting
are possible.

0.12

FEATURES

0～0.1

prevents malfunction due to chattering.

0.81

1.1

resistor, and the hysteresis of the built-in comparator● Wide supply voltage range. （2V～38V）● A detection voltage setup is possible by external resistance.

PIN layout● A delay time setup is possible by external capacity.

①VS

⑥VCC

● "L" reset output of open collector.

②C⑤GND● The circuit current is automatically adjusted according

③N.C.

④OUT

to the load current.

APPLICATION●Reset of logic circuit.
●Over voltage protection circui

BLOCK DIAGRAM

VCC
Circuit current adjustment

VSOUT

DelayGND

C230213

＜Analog IC＞

RT8Ｈ172Ｃ

Preliminary＊This is tentative specification
Reset IC with automatic circuit current adjustment
ABSOLUTE MAXIMUM RATINGS (Ta=25℃ unless otherwise noted.)

Symbol
Vcc
Vout
Iout
PdTjTstg
ToprParameter
Supply voltage
Output voltage
Output sink current
Power Dissipation
Junction temperature
Operating temperature
Storage temperatur

Ratings
404020200
150-40～150-20～85

Unit
VVｍAmW℃℃℃

ELECTRICAL CHARACTERISTIC (Ta=25℃,VCC=5V)
SymbolParameter

Test condition

Vcc
Icc
VSΔVS
Vs/ΔT
VIN
IIN
Tpd

Supply voltage
Circuit current
Detecting voltage
Hysterisis voltage

OUT-15kΩ pull-up resistor、VS=3V
OUT-15kΩ pull-up resistor（H⇒L）

Detection voltage temperature coefficient

Input voltage range
Input current
Delay time

Icd

Constant current at Cd pinVo(sat)
IOL

Output saturation voltage
Output leakage currentVS=1.5V
Cd=0.1uF、VOUT：L→H
OUT-15kΩ pull-up resistor、
VS=1.5V、Vcd=0V
VS=0V、IL=3mA
VOUT=5V

LimitsUnit
Min Typ Max
238V
150 250 350
uA
1.19 1.24 1.29
V50
6580
mV
0.02％/℃
-0.3
Vcc
V
60
210
nA
24
ms-10-5-3uA-0.2-0.4
1V
uA230213

＜Analog IC＞

RT8Ｈ172Ｃ

Preliminary＊This is tentative specification
Reset IC with automatic circuit current adjustment
APPLICATION CIRCUIT
Regulator

VCC

OUT

VDD

VCC

GND

Circuit current adjustment

R1RESET

VSOUT

Delay

R2Microcomputer

Detection voltage

GNDsetting resistor

CDelay capacitor

RT8H172C

The detecting supply voltage (Typ) ＝1.24 × R1＋R2 [V]R2The delay time (Typ)= 0.24 × Cd（uF） [sec]≪Typical Characteristic 1≫

DETECTING VOLTAGE vs SUPPLY VOLTAGE

CIRCUIT CURRENT VS AMBIENT TEMPERATURE
400

1.30

VCC=5V,VS=3V

VCC=5V,Ta=25℃

1.29
1.28300

DETECTING VOLTAGE Vs[V]CIRCUIT CURRENT Icc[uA]

350

250
200
150
100
500-40-200204060

AMBIENT TEMPERATURE Ta[℃]

80100

VSL(L→H)

1.27
1.261.25
1.24
1.23
1.22

VSL(H→L)

1.21

1.20
0102030

SUPPLY VOLTAGE Vcc[V]23021340

＜Analog IC＞

RT8Ｈ172ＣPreliminary＊This is tentative specification
Reset IC with automatic circuit current adjustment≪Typical Characteristic 2≫
HYSTERISIS VOLTAGE VS AMBIENT TEMPERATURE

DETECTING VOLTAGE VS AMBIENT TEMPERATURE

0.08

1.29

0.07

DETECTING VOLTAGE Vs[V]

1.28
1.27
1.26
1.25
1.24
1.23

VCC=5V

1.22
1.21
1.20
-40

-20020406080

100

HYSTERISIS VOLTAGE ΔVs[V]

1.30

0.05
0.04
0.03
0.02
0.01
0.00-40AMBIENT TEMPERATURE Ta[℃]

Tfd:VOUT=H→L
102510CIRCUIT CURRENT Icc[mA]

3DELAY TIME Tfd[us]DELAY TIME Td[us]41502030406080

100

Ta=25℃,VCC=5V,Vs=1V

0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0

400SUPPLY VOLTAGE Vcc[V]5101520OUTPUT SINK CURRENT Iout[mA]

Thermal Derating curve

LOW SUPPLY VOLTAGE VS OUTPUT VOLTAGE

Ta=25℃

0.72500.6200Power Dissipation Pd[mW]

OUTPUT VOLTAGE Vout[V]201.00.920100CIRCUIT CURRENT vs OUTPUT SINK CURRENT

Td:VOUT=L→H0-20

AMBIENT TEMPERATURE Ta[℃]

DELAY TIME VS SUPPLY VOLTAGE
Ta=25℃525

VCC=5V

0.06

0.50.40.3

RL=2.2kΩ

0.20.1

RL=22kΩ150

10050000.0

0.5

1.01.5

SUPPLY VOLTAGE Vcc[V]2.00255075100125150

AMBIENT TEMPERATURE Ta[℃]230213

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