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. In
particular, this IC is a system reset IC which realizes ultra-small size and low current consumption.
Features
1. Fixed delay time setting by counter timer
2. Low operating limit voltage
3. Hysteresis voltage provided for detection voltage
4. Low current consumption
5. 3 models are available for different delay times.
0.65V typ.
50mV typ.
I
CCH
=15µA typ.
PST596 50ms
PST597 100ms
PST598 200ms
C : 4.5V typ.
D : 4.2V typ.
E : 3.9V typ.
F : 3.6V typ.
G : 3.3V typ.
6. Each model has 10 detection voltage ranks.
H : 3.1V typ.
I : 2.9V typ.
J : 2.7V typ.
K : 2.5V typ.
L : 2.3V typ.
Package
SOT-25A (PST59
N) (with manual reset pin)
*
The box represents a rank of detection voltage.
Applications
1.
2.
3.
4.
5.
6.
Reset circuits for microcomputers, CPUs and MPUs
Reset circuits for logic circuits
Battery voltage check circuits
Back-up power supply switching circuits
Level detection circuits
Mechanical reset circuits
• Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
• The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.
MITSUMI
System Reset with Delay Time Circuit PST596~598
Equivalent Circuit Diagram
V
CC
5
OSC
Delay
T
R
Q
4
V
OUT
3
GND
SUB
M/R
1
2
Pin Assignment
1
5
4
M/R
SUB
GND
V
OUT
V
CC
2
3
4
5
1
2
3
SOT-25
(TOP VIEW)
Pin Description
Pin No.
1
2
3
4
5
Pin name
M/R
SUB
GND
V
OUT
V
CC
Function
Manual reset pin 1
SUB pin 2
GND pin
Reset signal output pin
Power supply pin/Voltage detection pin
1 : Note that the oscilloscope may mis-operate if the M/R pin falls below −0.3V.
2 : Connect to GND.
Absolute Maximum Ratings
Item
Storage temperature
Operating temperature
Power supply voltage
Manual reset input voltage
Allowable loss
(Except where noted otherwise Ta=25°C)
Symbol
T
STG
T
OPR
V
CC
max.
V
RES
max.
Pd
Ratings
- 40~+125
−20~+75
−0.3~+12
−0.3~+12
150
Units
°C
°C
V
V
mW
• Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
• The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.
MITSUMI
System Reset with Delay Time Circuit PST596~598
Recommended Operating Conditions
Item
Operating temperature
Power supply voltage
Symbol
T
OPR
V
CC
Ratings
-20~+75
- 0.3~+12
Units
°C
V
Electrical Characteristics
Item
(Ta=25°C) (Except where noted otherwise, resistance unit is
Ω)
Min. Typ. Max. Units
4.3
4.0
3.7
3.4
3.1
2.9
4.5
4.2
3.9
3.6
3.3
3.1
4.7
4.4
4.1
3.8
3.5
3.3
V
Symbol Measuring circuit Measurement conditions
C
D
E
V
CC
=H L
F
G
H
I
J
K
L
Detection voltage
Vs
1
R
L
= 470
V
OL
0.4V
2.75 2.90 3.05
2.55 2.70 2.85
2.35 2.50 2.65
2.15 2.30 2.45
30
50
± 0.01
0.1
0.4
±0.1
300 500
15
30
60
120
50
100
20
0.65 0.85
8
6
2.0
25
75
150
ms
µs
V
mA
mA
V
10
−0.3
60
0.8
µA
V
100
mV
%/°C
V
µA
µA
µA
Hysteresis voltage
Detection voltage
temperature coefficient
Vs
Vs/ T
V
OL
I
OH
I
CCL
I
CCH
T
PLH
T
PHL
V
OPL
I
OL
1
I
OL
2
V
RESH
I
RESH
V
RESL
1
1
1
1
1
1
2
2
1
1
1
V
CC
=L H L, R
L
= 470
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
=∞
R
L
= 4.7k
C
L
=100pF
1
PST596
PST597
PST598
Low-level output voltage
Output leakage current
Circuit current while on
Circuit current while off
"H" transport delay time
"L" transport delay time
Operating power supply voltage
Output current while on 1
Output current while on 2
M/R pin input H voltage
M/R pin input H current
M/R pin input low voltage
200 300
R
L
= 4.7k, C
L
=100pF, 2
R
L
= 4.7k, V
OL
0.4V
V
CC
=Vs min. −0.05V, R
L
= 0
V
CC
=Vs min. −0.05V, R
L
= 0
Ta=−20~+75°C
V
RESH
=2.0V
1 : T
PLH
; V
CC
= (Vs typ.−0.4V) (Vs typ.+0.4V)
2 : T
PLH
; V
CC
= (Vs typ.+0.4V) (Vs typ.−0.4V)
Note 3: Connect manual reset pin to GND when not using.
• Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
• The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.
MITSUMI
System Reset with Delay Time Circuit PST596~598
Measuring Circuit
[1]
R
L
A2
5
4
[2]
A1
INPUT
PULSE
5
V
CC
V1
+
R
L
PST
59X
1
2
3
C
L
=100pF
10µF
/10V
+
5.0V
4
PST
59X
V2
CRT
10µF
/10V
V
RES
1
2
3
A
: DC ammeter
V
: DC voltmeter
CRT : Osciloscope
INPUT PULSE
V
S
typ
V
S
typ
+0.4V
-0.4V
0V
Timing Chart
V
V
S
V
CC
V
S
V
V
OUT
T
PLH
T
PLH
T
PLH
V
V
RES
M/R
Time
Note : Thoroughly check the actual operation of the circuit, then set the manual reset when pressing the manual
switch ON to about 15µs.
• Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
• The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.
MITSUMI
System Reset with Delay Time Circuit PST596~598
Application Circuits
1. Normal hard reset
To
V
CC
5
R
L
4
To CPU reset pin
PST
59X
1
2
3
Note : Connect a capacitor between IC V
CC
and GND
pins if V
CC
line impedance is high.
2. Manual reset
To
V
CC
R
L
To CPU reset pin
Manual
SW
5
4
PST
59X
1
2
3
V
OUT
pin low for manual switch ON.
V
OUT
pin high for manual switch OFF.
Note1 : Mount a clamp diode if it is possible that the
M/R pin might go below −0.3V.
Note2 : Thoroughly check the actual operation of the
circuit, then set the manual reset when press-
ing the manual switch ON to about 15µs.
Clamp
Diode(
*
)
Characteristics
V
CC VS
V
OUT
V
OUT
V
S
V
S
V
CC
• Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
• The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.
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