MITSUMI
System Reset PST93XX
System Reset
Monolithic IC PST93XX Series
Outline
These low reset type ICs function in a variety of CPU systems and other logic systems, to detect power
supply voltage and reset the system accurately when power is turned on or interrupted.
They are ideal for use in battery check circuits for products using batteries, as they have ultra-low current
consumption and a high precision voltage detection function.
Features
1.
2.
3.
4.
5.
6.
High precision voltage detection
V
S
±2% max.
Ultra-low current consumption
I
CCH
=2.0µA typ.
I
CCL
=2.0µA typ.
Low operating limit voltage
0.65V typ.
Hysteresis voltage provided in detection voltage
50mV typ.
Output current high for ON
5mA min.
Detection voltage can be selected as desired within a range of 1.9V ~ 4.6V
in 0.1V steps, as indicated below.
PST93XX
detection voltage value
(Example: for 4.2V ....... PST9342)
Package
SC-82ABA (PST93
U)
Applications
1.
2.
3.
4.
5.
Reset circuits in microcomputers, CPUs and MPUs.
Logic circuit reset circuits.
Battery voltage check circuits.
Back-up power supply switching circuits.
Level detection circuits.
Pin Assignment
4
3
1
2
3
NC
GND
V
OUT
V
CC
1
2
4
SC-82ABA
(TOP VIEW)
MITSUMI
System Reset PST93XX
Electrical Characteristics
Item
(Ta=25
°
C)
Measurement
circuit
Measurement conditions
PST9346
PST9345
PST9344
PST9343
PST9342
PST9341
PST9340
PST9339
PST9338
PST9337
PST9336
PST9335
PST9334
PST9333
PST9332
PST9331
PST9330
PST9329
PST9328
PST9327
PST9326
PST9325
PST9324
PST9323
PST9322
PST9321
PST9320
PST9319
L, R
L
=4.7k
Min. Typ. Max. Units
4.508
4.410
4.312
4.214
4.116
4.018
3.920
3.822
3.724
3.626
3.528
3.430
3.332
3.234
3.136
3.038
2.940
2.842
2.744
2.646
2.548
2.450
2.352
2.254
2.156
2.058
1.960
1.862
30
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
50
±0.01
0.1
2.0
2.0
20
20
0.65
5
3
0.4
±0.1
4.0
4.0
60
60
0.85
4.692
4.590
4.488
4.386
4.284
4.182
4.080
3.978
3.876
3.774
3.672
3.570
3.468
3.366 V
3.264
3.162
3.060
2.958
2.856
2.754
2.652
2.550
2.448
2.346
2.244
2.142
2.040
1.938
100 mV
%/
°
C
V
µA
µA
µA
µs
µs
V
mA
mA
Symbol
Detection voltage
V
S
1
V
CC
=H L
R
L
=4.7k
V
OL
< 0.4V
=
Hysteresis voltage
Detection voltage
temperature coefficient
Low-level output voltage
Output leakage current
Circuit current while on
Circuit current while off
"H"transport delay time
"L"transport delay time
Operation limit voltage
Output current while on 1
Output current while on 2
Vs
Vs / T
V
OL
I
OH
I
CCL
I
CCH
T
PLH
T
PHL
V
OPL
I
OL
1
I
OL
2
1
1
1
1
1
1
2
2
1
1
1
V
CC
=L
H
R
L
=4.7k, Ta=-20~+75
°
C
V
CC
=Vs min.-0.05V, R
L
=4.7k
V
CC
=Vo=10V
V
CC
=Vs min.-0.05V, R
L
=∞
V
CC
=Vs typ./0.85, R
L
=∞
R
L
=4.7k, C
L
=100pF
1
R
L
=4.7k, C
L
=100pF
2
R
L
=4.7k, V
OL
< 0.4V
=
V
CC
=Vs min.-0.05V, Vo=0.4V
Vo=0.4V V
CC
=Vs min.-0.05V,
Ta=-20~+75
°
C
*
*
*
1 :: tt
*
2
: V
CC
= (V
S
typ.-0.4v) (V
S
typ.+0.4v)
PHL
: V
CC
= (V
S
typ.+0.4v)
(V
S
typ.-0.4v)
PLH
MITSUMI
System Reset PST93XX
Measuring Circuit
(1)
S1=ON, S2=OFF : when measuring I
OH
, I
OL
1, I
OL
2
S1=OFF, S2=ON : for measuring other than the above
(2)
A : DC ammeter
V : DC voltmeter
CRT : Oscilloscope
INPUT PULSE
Vs typ.+0.4V
Vs typ.-0.4V
0V
MITSUMI
System Reset PST93XX
Application circuits
[CL setting]
Several tens of mV of oscillation may appear in V
OUT
when V
CC
is near operating limit (approx. 0.7V)~1.0V, if R
L
is set at more than R
L
. .500kΩ in the above application
=
circuit. If this presents a problem, set the CL value
slightly higher (1000pF or more recommended).
*
*
: Varies slightly depending on V
S
rank.
Characteristics
V
OUT
Vs
Vs
V
CC
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