MITSUMI
IC for System Reset PST591~595
IC for System Reset
Monolithic IC PST591~595 Series
Outline
October 15, 2004
This IC functions in a variety of CPU systems and other logic systems, to detect supply voltage and reset the
system accurately when the power is turned on or interrupted. It incorporates a fixed-delay time generation
circuit. These are other system reset ICs such as PST574 and PST575 (both conventional). In particular, this
IC is a low-reset type system reset IC having a counter timer comprising of analog/digital mixed circuits.
PST591- 595 have a different delay time respectively.
6. Each model has 9 detection voltage ranks.
Applications
1. Reset circuits for microcomputers, CPUs and MPUs
2. Reset circuits for logic circuits
3. Battery voltage check circuits
4. Back-up power supply switching circuits
5. Level detection circuits
6. Mechanical reset circuits
Pr
od
MMP-4A (PST59
M)
TO-92A (PST59
)
The box represents a rank of detection voltage.
(MMP-4A has a manual reset pin, which should be connected to GND or NC during normal operation.)
*
uc
ts
Packages
to
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.
on
1. Fixed delay time setting by counter timer
Excellent delay time temperature characteristics
2. Low operating limit voltage
3. Hysteresis voltage provided for detection voltage
4. No-load current consumption
5. 5 models are available for different delay times.
±800ppm/
°
C
0.65V typ.
50mV typ.
I
CCL
=300µA typ. I
CCH
=200µA typ.
di
sc
be
tin
ue
PST594 400ms
PST595 800ms
H : 3.1V typ.
I : 2.9V typ.
J : 2.7V typ.
K : 2.5V typ.
Features
d
MITSUMI
IC for 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
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
Max. Unit
4.7
4.4
4.1
3.8
3.5
V
3.3
3.05
2.85
2.65
100 mV
%/
°
C
0.4
±0.1
600
350
75
150
300
600
1200
V
µA
µA
µA
Symbol Measuring circuit
Detection voltage
V
S
1
tin
*
*
*
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
"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
to
be
di
2
1
1
1
Measuring Circuit
[1]
Pr
od
Note 3: V
OUT
pin is low when manual reset pin is high.
V
OUT
pin is high when manual reset pin is low.
uc
*
1 tpLH : V = (V typ.-0.4V)
*
2 V =V min.-0.15V
CC
S
CC
S
ts
(V
S
typ.+0.4V), tpHL : V
CC
= (V
S
typ.+0.4V)
sc
[2]
"H" transport delay time
t
PLH
2
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
on
V
RES
=2V
(V
S
typ.-0.4V)
Note: Input model is an example for PST591C.
ue
d
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
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