MITSUMI PST3343

CMOS System Reset PST3XXX
MITSUMI
CMOS System Reset
Monolithic IC PST3XXX Series
Outline
This IC is a system reset IC developed using the CMOS process. Super low consumption current of 0.25µA
typ. has been achieved through use of the CMOS process. Also, detection voltage is high precision detection
of ±2%.
Features
(1) Super low consumption current
(2) High precision detection voltage
(3) Hysteresis characteristic
(4) Operating range
(5) Wide operating temperature range
(6) Detection voltage
0.25µA typ. (when VDD = Vs + 1V)
±2%
5% typ.
0.95 ~ 10V
-30 ~ +85°C
2 ~ 6V (0.1V step)
Package
SC-82AB (PST31XX, PST32XX)
SOT-25 (PST33XX, PST34XX)
Applications
(1) Microcomputer, CPU, MPU reset circuits
(2) Logic circuit reset circuits
(3) Battery voltage check circuits
(4) Back-up circuit switching circuits
(5) Level detection circuits
Pin Assignment
5
1
4
2
SC-82AB
3
1
2
3
4
5
OUT
VDD
VSS
NC
4
3
1
2
SOT-25
1
2
3
4
OUT
VDD
NC
VSS
MITSUMI
Equivalent Circuit Diagram
PST31XX
PST32XX
PST33XX
PST34XX
CMOS System Reset PST3XXX
CMOS System Reset PST3XXX
MITSUMI
Absolute Maximum Ratings
Item
Storage temperature
Operating temperature
Power supply voltage
Allowable loss
(Ta=25°C)
Symbol
TSTG
TOPR
VDDmax.
Pd
Rating
-40~+125
-30~+85
+12
150
Unit
°C
°C
V
mW
Electrical Characteristics
(1) Detection Voltage Table Ta=25°C
SOT-25
SC-82
CMOS output
N-ch open drain
CMOS output
N-ch open drain
2.0V±2%
PST3120
PST3220
PST3320
PST3420
2.1V±2%
PST3121
PST3221
PST3321
PST3421
2.2V±2%
PST3122
PST3222
PST3322
PST3422
2.3V±2%
PST3123
PST3223
PST3323
PST3423
2.4V±2%
PST3124
PST3224
PST3324
PST3424
2.5V±2%
PST3125
PST3225
PST3325
PST3425
2.6V±2%
PST3126
PST3226
PST3326
PST3426
2.7V±2%
PST3127
PST3227
PST3327
PST3427
2.8V±2%
PST3128
PST3228
PST3328
PST3428
2.9V±2%
PST3129
PST3229
PST3329
PST3429
3.0V±2%
PST3130
PST3230
PST3330
PST3430
3.1V±2%
PST3131
PST3231
PST3331
PST3431
3.2V±2%
PST3132
PST3232
PST3332
PST3432
3.3V±2%
PST3133
PST3233
PST3333
PST3433
3.4V±2%
PST3134
PST3234
PST3334
PST3434
3.5V±2%
PST3135
PST3235
PST3335
PST3435
3.6V±2%
PST3136
PST3236
PST3336
PST3436
3.7V±2%
PST3137
PST3237
PST3337
PST3437
3.8V±2%
PST3138
PST3238
PST3338
PST3438
3.9V±2%
PST3139
PST3239
PST3339
PST3439
4.0V±2%
PST3140
PST3240
PST3340
PST3440
4.1V±2%
PST3141
PST3241
PST3341
PST3441
4.2V±2%
PST3142
PST3242
PST3342
PST3442
4.3V±2%
PST3143
PST3243
PST3343
PST3443
4.4V±2%
PST3144
PST3244
PST3344
PST3444
4.5V±2%
PST3145
PST3245
PST3345
PST3445
4.6V±2%
PST3146
PST3246
PST3346
PST3446
4.7V±2%
PST3147
PST3247
PST3347
PST3447
4.8V±2%
PST3148
PST3248
PST3348
PST3448
4.9V±2%
PST3149
PST3249
PST3349
PST3449
5.0V±2%
PST3150
PST3250
PST3350
PST3450
5.1V±2%
PST3151
PST3251
PST3351
PST3451
5.2V±2%
PST3152
PST3252
PST3352
PST3452
5.3V±2%
PST3153
PST3253
PST3353
PST3453
5.4V±2%
PST3154
PST3254
PST3354
PST3454
5.5V±2%
PST3155
PST3255
PST3355
PST3455
5.6V±2%
PST3156
PST3256
PST3356
PST3456
5.7V±2%
PST3157
PST3257
PST3357
PST3457
5.8V±2%
PST3158
PST3258
PST3358
PST3458
5.9V±2%
PST3159
PST3259
PST3359
PST3459
6.0V±2%
PST3160
PST3260
PST3360
PST3460
Detection voltage measurement conditions: VDD = 9V 0V, measurement circuit 1
Detection voltage
CMOS System Reset PST3XXX
MITSUMI
Electrical Characteristics (Except where noted otherwise, Ta=25°C)
Item
Symbol
Hysteresis voltage
Vs
Detection voltage
Vs/ T
temperature coefficient
Consumption current
ICC
Measurement
circuit
1
1
1
N-ch output current 1
2
N-ch output current 2
2
N-ch output current 3
2
P-ch output current 1 2
3
P-ch output current 2 2
3
*
*
Notes:
Measurement conditions
Min.
±0.01
%/°C
0.25
1
*
*
1
*1
Measuring Circuit 3
µA
0.5
mA
1.6
3.7
mA
3.2
7.0
mA
0.36
0.62
mA
0.46
0.75
mA
Measuring Circuit
RL is not needed for CMOS output.
1
0.23
is detection voltage
*12 Vs
* Only for CMOS output products
Measuring Circuit 1
Unit
V
*
*1
Max.
Vs 0.03 Vs 0.05 Vs 0.08
Ta=-30~+85°C
VDD=Vs+1V 1
VDD=1.2V,
Nch : VDS=0.5V
VDD=2.4V,
Nch : VDS=0.5V,Vs>2.5V
VDD=3.6V,
Nch : VDS=0.5V,Vs>3.7V
VDD=4.8V,
Pch : VDS=0.5V,Vs<4.7V
VDD=6.0V,
Pch : VDS=0.5V,Vs<5.9V
Typ.
Measuring Circuit 2
CMOS System Reset PST3XXX
MITSUMI
Description of Operation
(1) VDD > VS, VOUT: H (M1: ON, M2, M3: OFF)
When VDD is gradually lowered from the above state, detection voltage is as follows.
Detection voltage: (R1 + R2 + R3) / (R2 + R3) VREF
(2) VDD < VS, VOUT: L (M1: OFF, M2, M3: ON)
When VDD is gradually raised from the above state, release voltage is as follows.
Release voltage = (R1 + R2) / (R2) VREF
(3) Hysteresis voltage = (release voltage) - (detection voltage).
(4) When VDD drops and goes below the minimum operating voltage, output is undefined; when output is
pulled up, output becomes VDD.
(5) VREF and detection resistors
1) The reference voltage source (VREF) for this IC is 0.8V typ. This gives excellent low power consumption
and temperature characteristics.
2) The high resistance process is used for resistors R1, R2 and R3 to achieve low consumption current for
the IC.
(6) Through current flows momentarily for detection and release. When using high VDD pin impedance, the
through current may cause oscillation.
(Example) Detection voltage changed by external settings
* The IC input voltage fluctuates due to the
*
through current R11 voltage drop, and
an oscillation state where detection and
release are repeated may occur.
With CMOS output types, do not use as
shown in the diagram at left.
CMOS System Reset PST3XXX
MITSUMI
Timing Chart
(2)
V
(1)
(3)
VS
VS
VDD
V
(4)
VOUT
(1) ~ (4) in the above diagram correspond to the Description of Operation.
Vs detection voltage
Vs hysteresis voltage
Application Circuits
Normal reset circuit
PST31XX, PST33XX (CMOS output products)
PST32XX, PST34XX (N-ch open drain output products)
CMOS System Reset PST3XXX
MITSUMI
Power ON reset circuit
A power ON reset circuit can be configured on PST32XX, PST34XX (N-ch open drain output products).
PST32XX, PST34XX (N-ch open drain output products)
VDD (V)
OUT (V)
T (S)
T (S)
If there is a problem with delay in rise time, insert a Di.
VDD (V)
OUT (V)
T(S)
T (S)
If power supply rises suddenly, output may go "H" momentarily when below minimum operating
voltage (0.95V), as shown in the above diagram.
CMOS System Reset PST3XXX
MITSUMI
Characteristics
(For products with PST3128 detection voltage 2.8V typ.)
0.5
0.45
0.4
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0
-40 -20
Detection voltage temperature
Detection voltage (V)
Consumption current (µA)
Consumption current (VDD = 3.8V) temperature
0
20
40
60
3
2.95
2.9
2.85
2.8
2.75
2.7
2.65
2.6
2.55
2.5
-40 -20
80 100
Hysteresis voltage (mV)
Release voltage (V)
2.9
2.8
2.7
2.6
0
20
40
60
80
100
2.5
2
1.5
1
0.5
40
60
Temperature (°C)
100
150
100
50
0
-40 -20
0
20
40
60
80
100
80
100
P-ch output current temperature (VDS = 0.5V)
P-ch output current (mA)
N-ch output current (mA)
3
20
80
Temperature (°C)
N-ch output current temperature (VDS = 0.5V)
0
60
200
Temperature (°C)
0
-40 -20
40
Hysteresis voltage temperature
3
2.5
-40 -20
20
Temperature (°C)
Temperature (°C)
Release voltage temperature
0
3
2.5
2
1.5
1
0.5
0
-40 -20
0
20
40
60
Temperature (°C)
80
100
CMOS System Reset PST3XXX
MITSUMI
Consumption current power supply voltage
Consumption current (µA)
Output voltage power supply voltage
Output voltage (V)
6
5
4
3
Detection
2
Release
1
0
0
1
2
3
4
5
1
0.8
0.6
0.4
0.2
0
0
2
Power supply voltage (V)
4
6
8
10
Power supply voltage (V)
Transfer delay time characteristics (N-ch open drain output products)
PST3446 response characteristics
Response time (mS)
Response time (mS)
PST3428 response characteristics
100
10
1
tPHL
0.1
tPLH
0.01
0.001
0.00001
0.0001
0.001
0.01
0.1
100
10
tPHL
1
0.1
tPLH
0.01
0.001
0.00001
Output capacitance (µF)
VS+2.0V
0.0001
0.001
0.01
Output capacitance (µF)
VS+2.0V
Input
voltage
1.2V
1.2V
VSS
VSS
Transfer delay time measurement circuit
7.0V
Output
voltage 3.5V
VSS
tPHL
tPLH
0.1