MITSUMI
System Reset PST591~595
System Reset
Monolithic IC PST591~595 Series
Outline
These 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, and has a built-in fixed delay time
generating circuit. This series has been represented in the past by PST574/PST575, but these new low reset
type system reset ICs expand the delay time series with a counter timer using an analog/digital hybrid circuit.
Features
1. Fixed delay time setting by counter timer
Excellent delay time temperature characteristics
2. Low operating limit voltage
3. Hysteresis voltage provided in detection voltage
4. Current consumption for no-load
5. 5 delay time products available
±800ppm/
°
C
0.65V typ.
50mV typ.
I
CCL
=300µA typ. I
CCH
=200µA typ.
PST591 50ms
PST592 100ms
PST593 200ms
C : 4.5V typ.
D : 4.2V typ.
E : 3.9V typ.
F : 3.6V typ.
G : 3.3V typ.
PST594 400ms
PST595 800ms
H : 3.1V typ.
I : 2.9V typ.
J : 2.7V typ.
K : 2.5V typ.
6. Each product has 9 detection voltage ranks.
Package
MMP-4A (PST59
M)
TO-92A (PST59
)
contains detection voltage rank.
(MMP-4A has a manual reset pin, which should be set at GND or NC during normal operation.)
*
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.
6. Mechanical reset circuits
MITSUMI
System Reset PST591~595
Electrical Characteristics
Item
(Ta=25
°
C) (Except where noted otherwise, resistance unit isΩ)
Measurement conditions
C
D
E
R
L
=470
F
G
V
OL
< 0.4V
=
V
CC
=H L
H
I
J
K
R
L
=470, V
CC
=L H L
R
L
=470, Ta=-20
°
C~+75
°
C
V
CC
=Vs min.-0.05V, R
L
=470
V
CC
=10V
V
CC
=Vs min.-0.05V, R
L
=∞
V
CC
=Vs typ./0.85V, R
L
=∞
PST591
PST592
R
L
=4.7k
PST593
C
L
=100PF 1
PST594
PST595
R
L
=4.7k, C
L
=100PF 1
R
L
=4.7k, V
OL
< 0.4V
=
V
CC
=V
S
min.-0.05V, R
L
=0
Ta=-20
°
C~+75
°
C, R
L
=0 2
Min.
4.3
4.0
3.7
3.4
3.1
2.9
2.75
2.55
2.35
30
Typ.
4.5
4.2
3.9
3.6
3.3
3.1
2.90
2.70
2.50
50
±0.01
0.1
0.4
±0.1
600
350
75
150
300
600
1200
Max. Unit
4.7
4.4
4.1
3.8
3.5
V
3.3
3.05
2.85
2.65
100 mV
%/
°
C
V
µA
µA
µA
Symbol Measuring circuit
Detection voltage
V
S
1
Hysteresis voltage
Detection voltage
temperature coefficient
Low-level output voltage
Output leakage current
Circuit current while on
Circuit current while off
V
S
V
S
/
V
OL
I
OH
I
CCL
I
CCH
T
1
1
1
1
1
1
"H" transport delay time
t
PLH
2
*
"L" transport delay time
Operating power supply voltage
Output current while on 1
Output current while on 2
Manual Input high voltage
reset
Input high current
pin
Input low voltage
t
PHL
V
OPL
I
OL
1
I
OL
2
V
RESH
V
RESH
V
RESL
2
1
1
1
*
*
V
RES
=2V
300
200
30
50
60 100
120 200
ms
240 400
480 800
10
µs
0.65 0.85 V
8
mA
6
mA
2.0
V
80 µA
0.8
V
*
1 tpLH : V = (V typ.-0.4V)
*
2 V =V min.-0.15V
CC
S
CC
S
(V
S
typ.+0.4V), tpHL : V
CC
= (V
S
typ.+0.4V)
(V
S
typ.-0.4V)
Note 3: V
OUT
pin is low when manual reset pin is high.
V
OUT
pin is high when manual reset pin is low.
Measuring Circuit
[1]
[2]
Note: Input model is an example for PST591C.
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