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5
2
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SC-82AB
12
43
SOT-25
CMOS System Reset PST3XXX
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 0.25µA typ. (when VDD = Vs + 1V)
(2) High precision detection voltage ±2%
(3) Hysteresis characteristic 5% typ.
(4) Operating range 0.95 ~ 10V
(5) Wide operating temperature range -30 ~ +85°C
(6) Detection voltage 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
1 OUT
2 V
3 VSS
4
5
DD
NC
1 OUT
2 V
3 NC
4 V
DD
SS
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Equivalent Circuit Diagram
PST31XX
PST32XX
CMOS System Reset PST3XXX
PST33XX
PST34XX
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CMOS System Reset PST3XXX
Absolute Maximum Ratings
(Ta=25°C)
Item Symbol Rating Unit
Storage temperature T
Operating temperature T
Power supply voltage V
STG
OPR
DDmax. +12 V
-
40~+125 °C
-
30~+85 °C
Allowable loss Pd 150 mW
Electrical Characteristics
(1) Detection Voltage Table Ta=25°C
Detection voltage
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
SOT-25 SC-82
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CMOS System Reset PST3XXX
Electrical Characteristics
Item Symbol
Hysteresis voltage Vs 1
Detection voltage
temperature coefficient
Consumption current I
N-ch output current 1 2
N-ch output current 2 2
N-ch output current 3 2
P-ch output current 1 *2
P-ch output current 2 *2
Notes:*1 Vs is detection voltage
2 Only for CMOS output products
*
Vs/ T 1 Ta=
CC 1VDD=Vs+1V
(Except where noted otherwise, Ta=25°C)
Measurement
circuit
3
3
Measurement conditions Min. Typ. Max. Unit
-
30~+85°C ±0.01 %/°C
1 0.25 1 µA
*
DS=0.5V
*
*
*
*
1
1
1
1
Nch : V
Nch : V
Pch : V
Pch : V
V
DD=1.2V,
Nch : V
DD=2.4V,
V
DS=0.5V,Vs>2.5V
DD=3.6V,
V
DS=0.5V,Vs>3.7V
DD=4.8V,
V
DS=0.5V,Vs<4.7V
DD=6.0V,
V
DS=0.5V,Vs<5.9V
Vs 0.03 Vs 0.05 Vs 0.08
0.23 0.5 mA
1.6 3.7 mA
3.2 7.0 mA
0.36 0.62 mA
0.46 0.75 mA
V
Measuring Circuit
Measuring Circuit 1
RL is not needed for CMOS output.
Measuring Circuit 3
Measuring Circuit 2
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Description of Operation
(1) VDD > VS, VOUT: H (M1: ON, M2, M3: OFF)
When V
Detection voltage: (R1 + R2 + R3) / (R2 + R3) VREF
(2) V
When V
Release voltage = (R1 + R2) / (R2) VREF
DD is gradually lowered from the above state, detection voltage is as follows.
DD < VS, VOUT: L (M1: OFF, M2, M3: ON)
DD is gradually raised from the above state, release voltage is as follows.
CMOS System Reset PST3XXX
(3) Hysteresis voltage = (release voltage) - (detection voltage).
(4) When V
pulled up, output becomes V
DD drops and goes below the minimum operating voltage, output is undefined; when output is
DD.
(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 V
DD 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.
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(2)
V
DD
VOUT
V
V
(1) (3)
(4)
V
S
VS
Timing Chart
CMOS System Reset PST3XXX
(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)
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T (S)
V
DD (V)
T (S)
OUT (V)
T(S)
V
DD (V)
T (S)
OUT (V)
CMOS System Reset PST3XXX
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)
If there is a problem with delay in rise time, insert a Di.
If power supply rises suddenly, output may go "H" momentarily when below minimum operating
voltage (0.95V), as shown in the above diagram.
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0
-
40 1008040 60200
-
20
Consumption current (µA)
Temperature (°C)
0.5
0.4
0.45
0.35
0.3
0.25
0.2
0.15
0.1
0.05
2.5
-
40 1008040 60200
-
20
Detection voltage (V)
Temperature (°C)
2.9
2.95
2.85
2.8
2.75
2.7
2.65
2.6
2.55
3
2.5
-
40 1008040 60200
-
20
Release voltage (V)
Temperature (°C)
2.8
2.9
2.7
2.6
3
0
-
40 1008040 60200
-
20
Hysteresis voltage (mV)
Temperature (°C)
100
150
50
200
0
-
40 1008040 60200
-
20
N-ch output current (mA)
Temperature (°C)
1.5
2.5
2
1
0.5
3
0
-
40 1008040 60200
-
20
P-ch output current (mA)
Temperature (°C)
1.5
2.5
2
1
0.5
3
CMOS System Reset PST3XXX
Characteristics
(For products with PST3128 detection voltage 2.8V typ.)
Consumption current (VDD= 3.8V) temperature
Release voltage temperature
Detection voltage temperature
Hysteresis voltage temperature
N-ch output current temperature (VDS = 0.5V)
P-ch output current temperature (VDS= 0.5V)
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3
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1
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054321
Detection Release
Output voltage (V)
Power supply voltage (V)
1
0
0.2
0.4
0.6
0.8
0108642
Consumption current (µA)
Power supply voltage (V)
0.001
0.01
0.1
1
10
0.00001 0.10.010.0010.0001
Response time (mS)
Output capacitance (µF)
100
tPHL
tPLH
0.001
0.01
0.1
1
10
0.00001 0.10.010.0010.0001
Response time (mS)
Output capacitance (µF)
100
tPHL
tPLH
VS+2.0V
Input
voltage
Output
voltage
1.2V
7.0V
3.5V
V
SS
VSS
tPHL tPLH
VS+2.0V
1.2V
V
SS
CMOS System Reset PST3XXX
Output voltage power supply voltage
Consumption current power supply voltage
Transfer delay time characteristics (N-ch open drain output products)
PST3428 response characteristics PST3446 response characteristics
Transfer delay time measurement circuit
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