MITSUMI
System Reset PST92XX
System Reset
Monolithic IC PST92XX Series
Outline
This reset IC in an ultra-compact package provides highly accurate detection and includes a delay circuit.
Features
1. Delay circuit
delay time can be set through an external capacitor.
2. High detection accuracy
Vs1.5%.
3. Low consumption current
3A typ.
Package
SOT-25
Applications
Pin Assignment
Equivalent Circuit Diagram
Microcomputer reset and detection of remaining battery charge.
1
2
3
5
4
SOT-25
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1
TC
2
SUB
3
GND
4
V
OUT
5
V
CC
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System Reset PST92XX
Absolute Maximum Ratings
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Pin Description
Recommended Operating Conditions
Pin No.
Pin name
Functions
1
TC
T
PLH
control pin
2
SUB
Substrate pin
*
1
3
GND
GND pin
4
V
OUT
Reset signal output pin
5
V
CC
V
CC
pin/voltage detect pin
Note 1 : Connect to GND.
Item
Symbol
Ratings
Unit
Storage temperature
T
STG
-40~+125 C
Operating temperature
T
OPR
-20~+175
C
Supply voltage
V
CC
max.
-0.3~+110
V
Allowable loss
Pd
150
mW
Item
Symbol
Ratings
Unit
Operating temperature
T
OPR
-20~+75 C
Supply voltage
V
CC
-0.3~+10
V
Electrical Characteristics
(Except where noted otherwise, Ta=25C)
Item
Symbol
Measurement
Measurement conditions
Min.
Typ.
Max.
Unit
circuit
PST9246 4.531
4.600
4.669
PST9245 4.432
4.500
4.568
PST9244 4.334
4.400
4.466
PST9243 4.235
4.300
4.365
PST9242 4.137
4.200
4.263
PST9241 4.038
4.100
4.162
PST9240 3.940
4.000
4.060
PST9239 3.841
3.900
3.959
PST9238 3.743
3.800
3.857
PST9237 3.644
3.700
3.756
PST9236 3.546
3.600
3.654
PST9235 3.447
3.500
3.553
V
CC
=H L
PST9234 3.349
3.400
3.451
Detecting voltage
V
S
1
R
L
=4.7k
PST9233 3.250
3.300
3.350
V
V
OL
<
= 0.4V
PST9232 3.152
3.200
3.248
PST9231 3.053
3.100
3.147
PST9230 2.955
3.000
3.045
PST9229 2.856
2.900
2.944
PST9228 2.758
2.800
2.842
PST9227 2.659
2.700
2.741
PST9226 2.561
2.600
2.639
PST9225 2.462
2.500
2.538
PST9224 2.364
2.400
2.436
PST9223 2.265
2.300
2.335
PST9222 2.167
2.200
2.233
PST9221 2.068
2.100
2.132
PST9220 1.970
2.000
2.030
PST9219 1.871
1.900
1.929
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System Reset PST92XX
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Item
Symbol
Measurement
Measurement conditions
Min.
Typ.
Max.
Unit
circuit
V
CC
=L H L, R
L
=4.7k
Hysteresis voltage
Vs
1
S1 : ON
25
50
100
mV
Detecting voltage
R
L
=4.7k
, Ta=-20~+75C
temperature coefficient
Vs/ T
1
S1 : ON
0.01
%/C
Low level output voltage
V
OL
1
V
CC
1=V
S
min. -0.05V
0.1
0.4
V
R
L
=4.7k
S1 : ON
Output Leak current
I
OH
1
V
CC
1=V
CC
2=10V S2 : ON
0.1
A
Circuit current at ON time
I
CCL
1
V
CC
1=V
S
min. -0.05V R
L
=
5.0
9.0
A
Circuit current at OFF time
I
CCH
1
V
CC
1=V
S
typ./0.85 R
L
=
3.0
5.0
A
"H" transmission
T
PLH
2
R
L
=4.7k
, C
L
=100pF
(
*
3)
mS
delay time
Cd=0.01F
*
1
"L" transmission
T
PHL
2
R
L
=4.7k
, C
L
=100pF
(
*
3)
S
delay time
Cd=0.01F
*
2
Threshold operating voltage
V
OPL
1
R
L
=4.7k
V
OL
<
= 0.4V S1 : ON
0.65
0.85
V
Output current
I
OL
1
1
V
CC
1=V
S
min. -0.05V
5
mA
at ON time 1
V
CC
2=0.4V S2 : ON
Output current
I
OL
2
1
V
CC
1=V
S
min. -0.05V
3
mA
at ON time 2
Ta=-20~+75C S2 : ON
NOTE 1: T
PLH
: V
CC
=(V
S
typ. -0.4V) (V
S
typ. +0.4V)
NOTE 2 : T
PLH
: V
CC
=(V
S
typ. +0.4V) (V
S
typ. -0.4V)
NOTE 3 : Tables of PST92 series transmission delay time
T
PLH
T
PHL
PST9246
195
140
PST9245
190
140
PST9244
185
140
PST9243
180
140
PST9242
175
140
PST9241
170
140
PST9240
165
140
PST9239
160
140
PST9238
155
120
PST9237
150
120
PST9236
145
120
PST9235
140
120
PST9234
135
120
PST9233
130
120
PST9232
125
120
PST9231
120
120
PST9230
115
120
PST9229
110
120
PST9228
105
100
PST9227
100
100
PST9226
95
100
PST9225
90
100
PST9224
85
100
PST9223
80
100
PST9222
75
100
PST9221
70
100
PST9220
65
100
PST9219
60
100
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System Reset PST92XX
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Measuring Circuit
(1)
(2)
A : DC Amperemeter
V : DC Voltmeter
CRT : Oscilloscope
INPUT PULSE
Vs typ.+0.4V
Vs typ.-0.4V
0V
MITSUMI
System Reset PST92XX
Timing Chart
T
PLH
T
PLH
T
PLH
>T
PLH
Vs
V
CC
V
V
OUT
V
Vs
Application Circuit
NOTE 1 : When the rapid noise occurs to V
CC
, V
OUT
has sometimes switched over even if V
CC
doesn't become
below V
S
.
If the impedance of V
CC
line is high enough, connect a
capacitor between V
CC
and GND terminal of the IC.
(NOTE 1)
MITSUMI
System Reset PST92XX
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Characteristics
(1) V
CC
vs V
OUT
Vs
Vs
V
CC
V
OUT
(2) Cd-T
PLH
1.0E+00
1.0E+00
1.0E-01
1.0E-02
1.0E-03
1.0E-04
1.0E-05
1.0E+01
1.0E+02
1.0E+03
1.0E+04
Cd (pF)
T
PLH
(S)
Representative T
PLH
Data : PST9220, PST9244
"H" transmission delay time can be calculated roughly using the following formula, but there is some
fluctuation due to element deviation and the Vcc input signal (dV/dT).
T
PLH
[ms] .=. Cd [F] d
d: delay time coefficient
PST9220 Cd-T
PLH
Characteristics
1.0E+00
1.0E-05
1.0E-04
1.0E-03
1.0E-02
1.0E-01
1.0E+00
1.0E+01
1.0E+02
1.0E+03
1.0E+04
Cd (pF)
T
PLH
(S)
PST9244 Cd-T
PLH
Characteristics
Model name
d
Model name
d
Model name
d
PST9246
1.95 10
4
PST9236
1.45 10
4
PST9226
0.95 10
4
PST9245
1.90 10
4
PST9235
1.40 10
4
PST9225
0.90 10
4
PST9244
1.85 10
4
PST9234
1.35 10
4
PST9224
0.85 10
4
PST9243
1.80 10
4
PST9233
1.30 10
4
PST9223
0.80 10
4
PST9242
1.75 10
4
PST9232
1.25 10
4
PST9222
0.75 10
4
PST9241
1.70 10
4
PST9231
1.20 10
4
PST9221
0.70 10
4
PST9240
1.65 10
4
PST9230
1.15 10
4
PST9220
0.65 10
4
PST9239
1.60 10
4
PST9229
1.10 10
4
PST9219
0.60 10
4
PST9238
1.55 10
4
PST9228
1.05 10
4
PST9237
1.50 10
4
PST9227
1.00 10
4
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