MITSUMI
System Reset PST611
System Reset
Monolithic IC PST611
Outline
This IC functions in a variety of CPU systems and other logic systems, to constantly monitor power supply
voltage, and to reset the system accurately when power is turned on or interrupted.
System reset ICs have been represented by the PST series in the past, but this IC is able to set no-response
time through an external capacitor, and controls reset output relative to temporary power supply voltage drop
caused by motor load or the like in systems using batteries.
Also, the detection voltage for this IC is set low so that it can respond to systems that operate on low voltage.
Features
1.
2.
3.
4.
5.
Low current consumption
Low operating limit voltage
High reset output
No-response time can be controlled
8 types of detection voltages provided
I
CCH
=2.2µA
0.75V max.
PST611
sc
on
Rating
-40~+125
-10~+70
-0.3~+5
200
tin
R : 1.6V typ.
S : 1.5V typ.
T : 1.4V typ.
U : 1.3V typ.
V : 1.2V typ.
W : 1.1V typ.
X : 1.0V typ.
Y : 0.9V typ.
Units
°
C
°
C
I
CCL
=3.2µA
MMP-4A (PST611 M)
contains detection voltage rank.
Pr
Absolute Maximum Ratings
Item
Storage temperature
Operating temperature
Power supply voltage
Allowable loss
od
1.
2.
3.
4.
Reset circuits in microcomputers, CPUs and MPUs
Set voltage drop detection
Battery voltage check circuits.
Voltage detection circuits in general
uc
ts
Applications
to
*
be
(Ta=25
°
C)
Symbol
T
STG
T
OPR
V
CC
max.
Pd
Package
di
ue
V
mW
d
MITSUMI
System Reset PST611
Electrical Characteristics
Item
(Ta=25
°
C)
Symbol
I
CC
H
I
CC
L
Measurement conditions
V
CC
=0.95V, VR=OPEN
V
CC
=1.2V, VR=OPEN
R
S
T
U
V
CC
: variable=3V
V
W
X
Y
V
CC
=1.2V, V
TC
=0.4V, VR=3V
V
CC
=0.95V, V
TC
=0.1V, VR=3V
V
CC
=0V, V
TC
=0.1V, VR=0V
Min. Typ.
2.2
3.2
1.552 1.6
1.455 1.5
1.358 1.4
1.261 1.3
1.164 1.2
1.067 1.1
0.970 1.0
0.873 0.9
0.1
0.05
16
33
±200
0.06 0.08
0.06 0.09
Pin Assignment
di
1
2
3
4
4
3
be
2
1
Pr
od
uc
Equivalent Circuit Diagram
ts
to
MMP-4A
sc
on
R
OUT
V
CC
T
C
GND
Max. Units
µA
Consumption current
µA
1.648 V
1.545 V
1.442 V
1.339 V
Detection voltage
Vs
1.236 V
1.133 V
1.030 V
0.927 V
TC pin charge current
I
TC
1
µA
TC pin discharge current
I
TC
2
µA
TC pin discharge resistance
R
TC
66 MEGΩ
Detection voltage temperature coefficient
Vs
ppm
TC pin threshold
V
THTC
V
CC
=1.0V, V
TC
: variable=3V
0.10
V
TC pin hysteresis voltage
V
THTCH
V
CC
=1.0V, V
TC
: variable=3V
0.12
V
R output leakage current
I
LEAK
V
CC
=0.95V, VR=3V
0.1
µA
R output sync current
I
OL
V
CC
=1.0V, V
TC
=0.4V, VR=0.4V
15
50
µA
Operation limit voltage
V
OPL
V
CC
: variable V
TC
=0.4V, VR=3V
0.7 0.75
V
Note: Characteristics other than for detection voltage use the 1.0V(X) type as a representative example.
tin
ue
d
MITSUMI
System Reset PST611
Measuring Circuit
Measurement conditions
Item
V
CC
1.2V
V
TC
-
VR
-
SW1
OFF
sc
on
SW2
3
OFF
1
ON
ON
ON
1
1
1
ON
1
ON
1
OFF
ON
2
2
OFF
1
Measurement Method
tin
Measured
value
A1
Measure A1 value.
Gradually lower V
CC
from
V1
1.2V and measure the value
of V1 when V2 value
switches from low to high.
3V
3V
0V
A2
A2
A2
Measure A2 value.
Measure A2 value.
0.1V/A2 value
Gradually lower V
TC
from
0.3V and measure the value
Variable
3V
V3
of V3 when V2 value
switches from low to high.
(V
THTC
)
The value of V3 when V2
switches from high to low
while raising V
TC
from 0.0V,
minus "V
THTC
."
Measure A3K value.
Measure A3 value.
The limit voltage within
which V2 value stays low
while lowering V
CC
from
1.0V.
Reference
Variable
Consumption current
Detection voltage
TC pin charge current
TC pin discharge current
ts
od
TC pin threshold
Pr
uc
TC pin discharge resistance
to
1.2V
0V
0.95V
1.0V
TC pin hysteresis voltage
1.0V
be
-
3V
0.4V
0.2V
0.1V
Variable
3V
-
0.4V
3V
0.4V
0.4V
3V
di
R output leakage current
R output sync current
0.95V
1.0V
Operation limit voltage
Variable
ue
V3
A3
A3
V1
d
MITSUMI
System Reset PST611
Delay Characteristics
Ct=0.01µF
V
CC
V
3
T3
0.7V
T2
(100mS)
T1 (20mS)
Application circuits
ts
to
be
od
uc
Rise delay time (T1) and
No-response time (T2)
using external capacitor
10000.00
Pr
Delay time (mS)
di
1000.00
T
2
100.00
T
1
10.00
1.00
sc
on
0.0001
0.001
Note 1: Delay times T1 and T2 are found
from the formulae below.
T
1
(S)=C
T
x (2.0x10
6
)
T
2
(S)=C
T
x10
7
Note 2: R
OUT
is not output if V
CC
is
temporarily lower than VS.
tin
0.01
External capacitance C
ue
0.1
d
R
OUT
1 (µF)
MITSUMI
System Reset PST611
Application circuits
1. How to change reset output logic
Note: Set R1 so that V1 > threshold voltage.
2. How to change detection voltage (detection voltage UP)
be
3 Battery checker (LED ON for high voltage)
Pr
od
uc
ts
to
di
Note: Set R1 so that the value of I
1
is sufficient
to ignore I
CC
.
Note: When V
CC
is less than LED VF, take LED
lamp power from DC-DC converter or
other output.
sc
on
tin
ue
d
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