MITSUMI PST9220

IC for System Reset PST92XX
MITSUMI
IC for System Reset
Monolithic IC PST92XX Series
July 18, 2000
Outline
This IC is a reset IC with a delay circuit which realizes high-precision detection accuracy and is provided in an
ultra-small package.
Features
1. Internal delay circuit
2. High-precision detection accuracy
3. Low current consumption
Delay time can be set with an external capacitor.
Vs±1.5%.
3µA typ.
Package
SOT-25A
Applications
Microcomputer reset and battery level detection
Pin Assignment
5
1
4
2
3
SOT-25A
(TOP VIEW)
Equivalent Circuit Diagram
1
TC
2
SUB
3
GND
4
VOUT
5
VCC
IC for System Reset PST92XX
MITSUMI
Pin Description
Pin No.
Pin name
1
TC
2
SUB
3
GND
4
VOUT
5
VCC
Note 1 : Connect to GND.
Functions
TPLH control pin
Substrate pin*1
GND pin
Reset signal output pin
VCC pin/voltage detect pin
Absolute Maximum Ratings
Item
Storage temperature
Operating temperature
Supply voltage
Allowable loss
Symbol
TSTG
TOPR
VCC max.
Pd
Ratings
-40~+125
-20~+175
-0.3~+110
150
Unit
°C
°C
V
mW
Ratings
-20~+75
-0.3~+10
Unit
°C
V
Recommended Operating Conditions
Item
Operating temperature
Supply voltage
Electrical Characteristics
Item
Detecting voltage
Symbol
VS
Symbol
TOPR
VCC
(Ta=25°C) (Except where noted otherwise, resistance unit is Ω)
Measurement
circuit
1
Measurement conditions
VCC=H L
RL=4.7k
VOL <= 0.4V
PST9246
PST9245
PST9244
PST9243
PST9242
PST9241
PST9240
PST9239
PST9238
PST9237
PST9236
PST9235
PST9234
PST9233
PST9232
PST9231
PST9230
PST9229
PST9228
PST9227
PST9226
PST9225
PST9224
PST9223
PST9222
PST9221
PST9220
PST9219
Min.
Typ.
Max.
4.531
4.432
4.334
4.235
4.137
4.038
3.940
3.841
3.743
3.644
3.546
3.447
3.349
3.250
3.152
3.053
2.955
2.856
2.758
2.659
2.561
2.462
2.364
2.265
2.167
2.068
1.970
1.871
4.600
4.500
4.400
4.300
4.200
4.100
4.000
3.900
3.800
3.700
3.600
3.500
3.400
3.300
3.200
3.100
3.000
2.900
2.800
2.700
2.600
2.500
2.400
2.300
2.200
2.100
2.000
1.900
4.669
4.568
4.466
4.365
4.263
4.162
4.060
3.959
3.857
3.756
3.654
3.553
3.451
3.350
3.248
3.147
3.045
2.944
2.842
2.741
2.639
2.538
2.436
2.335
2.233
2.132
2.030
1.929
Unit
V
IC for System Reset PST92XX
MITSUMI
Item
Hysteresis voltage
Symbol
Vs
Measurement
circuit
1
Detecting voltage
Vs/ T
temperature coefficient
1
Low level output voltage
VOL
1
Output Leak current
Circuit current at ON time
Circuit current at OFF time
"H" transmission
delay time
"L" transmission
delay time
Threshold operating voltage
Output current
at ON time 1
Output current
at ON time 2
IOH
ICCL
ICCH
1
1
1
TPLH
2
TPHL
2
VOPL
1
IOL1
1
IOL2
1
Measurement conditions
VCC1=L
H L, RL=4.7k
S1 : ON
RL=4.7k, Ta=-20~+75°C
S1 : ON
VCC1=VS min. -0.05V
RL=4.7k S1 : ON
VCC1=VCC2=10V S2 : ON
VCC1=VS min. -0.05V RL=∞
VCC1=VS typ./0.85 RL=∞
RL=4.7k, CL=100pF
Cd=0.01µF *1
RL=4.7k, CL=100pF
Cd=0.01µF *2
RL=4.7k VOL =< 0.4V S1 : ON
VCC1=VS min. -0.05V
VCC2=0.4V S2 : ON
VCC1=VS min. -0.05V
Ta=-20~+75°C S2 : ON
Min.
Typ.
Max.
Unit
25
50
100
mV
NOTE 1: TPLH : VCC=(VS typ. -0.4V) (VS typ. +0.4V)
NOTE 2 : TPLH : VCC=(VS typ. +0.4V) (VS typ. -0.4V)
NOTE 3 : Tables of PST92
series transmission delay time (Please see below.)
PST9246
PST9245
PST9244
PST9243
PST9242
PST9241
PST9240
PST9239
PST9238
PST9237
PST9236
PST9235
PST9234
PST9233
PST9232
PST9231
PST9230
PST9229
PST9228
PST9227
PST9226
PST9225
PST9224
PST9223
PST9222
PST9221
PST9220
PST9219
TPLH
195
190
185
180
175
170
165
160
155
150
145
140
135
130
125
120
115
110
105
100
95
90
85
80
75
70
65
60
TPHL
140
140
140
140
140
140
140
140
120
120
120
120
120
120
120
120
120
120
100
100
100
100
100
100
100
100
100
100
±0.01
%/°C
0.1
0.4
V
5.0
3.0
±0.1
9.0
5.0
µA
µA
µA
(*3)
ms
(*3)
µs
0.65
0.85
V
5
mA
3
mA
IC for System Reset PST92XX
MITSUMI
Measuring Circuit
(1)
(2)
A : DC Amperemeter
V : DC Voltmeter
CRT : Oscilloscope
INPUT PULSE
Vs typ.+0.4V
Vs typ.-0.4V
0V
IC for System Reset PST92XX
MITSUMI
Timing Chart
V
Vs
VCC
Vs
>TPLH
V
VOUT
TPLH
TPLH
TPLH
Application Circuit
If the impedance of VCC line is high enough, connect a
capacitor between VCC and GND terminal of the IC.
the rapid noise occurs to V
* : VWhen
.
CC,
S
*
VOUT has sometimes switched over even if VCC doesn't become below
IC for System Reset PST92XX
MITSUMI
Characteristics
(1) VCC vs VOUT
VOUT
Vs
Vs
VCC
(2) Cd-TPLH
Representative TPLH Data : PST9220, PST9244
1.0E+00
1.0E-01
1.0E-02
1.0E-03
1.0E-04
1.0E-05
1.0E+00
PST9244 Cd-TPLH Characteristics
TPLH (S)
TPLH (S)
PST9220 Cd-TPLH Characteristics
1.0E+01
1.0E+02
1.0E+03
1.0E+04
1.0E+00
1.0E-01
1.0E-02
1.0E-03
1.0E-04
1.0E-05
1.0E+00
Cd (pF)
1.0E+01
1.0E+02
1.0E+03
1.0E+04
Cd (pF)
"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).
TPLH [ms] .=. Cd [µF] d
d: delay time coefficient
Model name
d
Model name
d
Model name
d
PST9246
1.95 104
PST9236
1.45
104
PST9226
0.95
104
PST9245
1.90 104
PST9235
1.40
104
PST9225
0.90
104
PST9244
1.85 104
PST9234
1.35
104
PST9224
0.85
104
PST9243
1.80 104
PST9233
1.30
104
PST9223
0.80
104
PST9242
1.75 104
PST9232
1.25
104
PST9222
0.75
104
PST9241
1.70 104
PST9231
1.20
104
PST9221
0.70
104
PST9240
1.65 104
PST9230
1.15
104
PST9220
0.65
104
PST9239
1.60 104
PST9229
1.10
104
PST9219
0.60
104
PST9238
1.55 104
PST9228
1.05
104
PST9237
1.50 104
PST9227
1.00
104