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. High precision voltage detection
V
S
2% max.
2. Ultra-low current consumption
I
CCH
=2.0A typ. I
CCL
=2.0A typ.
3. Low operating limit voltage
0.65V typ.
4. Hysteresis voltage provided in detection voltage
50mV typ.
5. Output current high for ON
5mA min.
6. 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. Reset circuits in microcomputers, CPUs and MPUs.
2. Logic circuit reset circuits.
3. Battery voltage check circuits.
4. Back-up power supply switching circuits.
5. Level detection circuits.
Pin Assignment
1
2
4
3
SC-82ABA
(TOP VIEW)
1
NC
2
GND
3
V
OUT
4
V
CC
MITSUMI
System Reset PST93XX
Electrical Characteristics
(Ta=25
C)
Item
Symbol
Measurement
Measurement conditions
Min. Typ. Max. Units
circuit
PST9346 4.508 4.600 4.692
PST9345 4.410 4.500 4.590
PST9344 4.312 4.400 4.488
PST9343 4.214 4.300 4.386
PST9342 4.116 4.200 4.284
PST9341 4.018 4.100 4.182
PST9340 3.920 4.000 4.080
PST9339 3.822 3.900 3.978
PST9338 3.724 3.800 3.876
PST9337 3.626 3.700 3.774
PST9336 3.528 3.600 3.672
PST9335 3.430 3.500 3.570
V
CC
=H L
PST9334 3.332 3.400 3.468
Detection voltage
V
S
1
R
L
=4.7k
PST9333 3.234 3.300 3.366
V
V
OL
<
= 0.4V
PST9332 3.136 3.200 3.264
PST9331 3.038 3.100 3.162
PST9330 2.940 3.000 3.060
PST9329 2.842 2.900 2.958
PST9328 2.744 2.800 2.856
PST9327 2.646 2.700 2.754
PST9326 2.548 2.600 2.652
PST9325 2.450 2.500 2.550
PST9324 2.352 2.400 2.448
PST9323 2.254 2.300 2.346
PST9322 2.156 2.200 2.244
PST9321 2.058 2.100 2.142
PST9320 1.960 2.000 2.040
PST9319 1.862 1.900 1.938
Hysteresis voltage
Vs
1
V
CC
=L H L, R
L
=4.7k
30
50
100
mV
Detection voltage
Vs / T
1
R
L
=4.7k, Ta=-20~+75
C
0.01
%/
C
temperature coefficient
Low-level output voltage
V
OL
1
V
CC
=Vs min.-0.05V, R
L
=4.7k
0.1
0.4
V
Output leakage current
I
OH
1
V
CC
=Vo=10V
0.1
A
Circuit current while on
I
CCL
1
V
CC
=Vs min.-0.05V, R
L
=
2.0
4.0
A
Circuit current while off
I
CCH
1
V
CC
=Vs typ./0.85, R
L
=
2.0
4.0
A
"H"transport delay time
T
PLH
2
R
L
=4.7k, C
L
=100pF
*
1
20
60
s
"L"transport delay time
T
PHL
2
R
L
=4.7k, C
L
=100pF
*
2 20
60
s
Operation limit voltage
V
OPL
1
R
L
=4.7k, V
OL
<
= 0.4V
0.65
0.85
V
Output current while on 1
I
OL
1
1
V
CC
=Vs min.-0.05V, Vo=0.4V
5
mA
Output current while on 2
I
OL
2
1
Vo=0.4V V
CC
=Vs min.-0.05V,
3
mA
Ta=-20~+75
C
*
1 : t
PLH
: V
CC
= (V
S
typ.-0.4v) (V
S
typ.+0.4v)
*
2 : t
PHL
: V
CC
= (V
S
typ.+0.4v) (V
S
typ.-0.4v)
MITSUMI
System Reset PST93XX
Measuring Circuit
(1)
(2)
Vs typ.+0.4V
INPUT PULSE
0V
Vs typ.-0.4V
A : DC ammeter
V : DC voltmeter
CRT : Oscilloscope
S1=ON, S2=OFF : when measuring I
OH
, I
OL
1, I
OL
2
S1=OFF, S2=ON : for measuring other than the above
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
.
=.500k
*
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
Vs Vs
V
CC
V
OUT
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