MITSUMI PST575

System Reset PST575
MITSUMI
System Reset
Monolithic IC PST575
Outline
This IC functions 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. This ultra-low current consumption low
reset type system reset IC has a built-in delay time generating circuit that can set the time by an external
capacitor and resistor. It is ideal for use in multi-CPU systems because a fast-rising output waveform can be
obtained.
Features
1. Ultra-low current consumption
2. Low operating limit voltage
3. Output current high for ON
4. Hysteresis voltage provided in detection voltage
5. Delay time can set over a wide range using
external capacitor and resistor.
6. 10 ranks of detection voltage
ICCH=7.5µA typ. ICCL=400µA typ.
0.65V typ.
30mA typ.
50mV typ.
10µS~10S
PST575 C : 4.5V typ.
D : 4.2V typ.
E : 3.9V typ.
F : 3.6V typ.
G : 3.3V typ.
H : 3.1V typ.
I : 2.9V typ.
J : 2.7V typ.
K : 2.5V typ.
L : 2.3V typ.
Package
MMP-4A (PST575 M)
DIP-8A (PST575 )
contains detection voltage rank
*
Applications
1. Reset circuits in microcomputers, CPUs and MPUs (especially multi-CPU sets)
2. Logic circuit reset circuits.
3. Battery voltage check circuits.
4. Back-up power supply switching circuits.
5. Level detection circuits.
Pin Assignment
8
1
7
2
6
3
DIP-8A
5
4
3
GND
4
Cd
5
VOUT
7
VCC
4
3
1
2
MMP-4A
1
VCC
2
VOUT
3
Cd
4
GND
System Reset PST575
MITSUMI
Equivalent Circuit Diagram
Absolute Maximum Ratings
Item
Storage temperature
Operating temperature
Power supply voltage
Symbol
TSTG
TOPR
VCC max.
Allowable loss
Pd
Electrical Characteristics
Item
Detection voltage
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
Operating power supply voltage
Output current while on I
Output current while on II
Threshold voltage for delay
time setting comparator (CO2)
*1 : tpLH : V = (V typ.-0.4V)
*2: V =V min.-0.15V
CC
CC
S
(Ta=25°C)
S
Rating
-40~+125
-20~+75
-0.3~10
200 (MMP-3A)
300 (TO-92A)
Units
°C
°C
V
mW
(Ta=25°C) (Except where noted otherwise, resistance unit is Ω)
Symbol Measuring circuit
1
Measurement conditions
PST575C
PST575D
PST575E
PST575F
RL=470
PST575G
VOL <= 0.4V
PST575H
VCC=H L
PST575I
PST575J
PST575K
PST575L
RL=470, VCC=L H L
V S/ T
1
RL=470, Ta=-20°C~+75°C
VOL
IOH
ICCL
ICCH
tpLH
tpHL
VopL
IOL I
IOL II
1
1
1
1
2
2
1
1
1
Vtsh
1
VS
VS
1
Typ.
4.5
4.2
3.9
3.6
3.3
3.1
2.90
2.70
2.50
2.30
50
Max. Units
4.7
4.4
4.1
3.8
3.5
V
3.3
3.05
2.85
2.65
2.45
100 mV
±0.01
%/°C
VCC=Vs min.-0.05V, RL=470
0.1
VCC=7.5V
VCC=Vs min.-0.05V, RL=∞
400
VCC=Vs typ./0.85V, RL=∞
7.5
Rd=100k, Cd=0.01µF 1
0.75 1.25
Rd=100k, Cd=0.01µF 1
6
RL=4.7kΩ, VOL =< 0.4V
0.65
VCC=Vs min.-0.05V, RL=0
8
30
Ta=-20°C~+75°C, RL=0 2
5
VCC=5.0V, Rd=100k, Cd=0.01µF
3.5 3.7
RL=4.7k, CL=100pF
0.4
V
±0.1 µA
650 µA
12.0 µA
1.75 mS
20
µS
0.85 V
mA
mA
(VS typ.+0.4V), tpHL : VCC= (VS typ.+0.4V)
Min.
4.3
4.0
3.7
3.4
3.1
2.9
2.75
2.55
2.35
2.15
25
*
*
*
(VS typ.-0.4V), CL=100pF
3.9
V
System Reset PST575
MITSUMI
Measuring Circuit
(Example: PST575C)
[1]
[2]
Input pulse
0.8V
4.9
VS
4.1
0V
Note: Input model is an example for PST575C (MMP-4P).
Characteristics
(Example: PST575C)
VCC vs. VOUT
VCC vs. ICC
500
8
7
VOUT
(V)
Ta=-20°C
400
6
5
Ta=25°C
4
ICC 300
(µA)
3
Ta=-25°C
Ta=25°C
Ta=75°C
2
1
0
1
2
3
Ta=75°C
200
4
5
6
7
8
VCC (V)
100
0
0
1
2
3
4
5
6
7
8
VCC (V)
VS vs. Ta
VS
(V)
VS vs. Ta
4.53
80
4.52
70
4.51
60
4.50
VS 50
(mV)
4.49
40
4.48
30
4.47
-40
20
-20
0
20
Ta
(°C)
40
60
80
-40
-20
0
20
Ta
(°C)
40
60
80
System Reset PST575
MITSUMI
IOL vs. Ta
VOL vs. Ta
60
300
50
250
IOL
(mA)
40
VOL
(mV)
30
20
200
150
100
10
-40
-20
0
20
40
60
80
50
-40
-20
0
Ta (°C)
ICCH vs. Ta
20
40
60
80
40
60
80
Ta (°C)
ICCL vs. Ta
10
500
9
8
lCCH
(µA)
ICCL 400
(µA)
7
6
300
5
4
-40
-20
0
20
40
60
80
-40
-20
0
20
Ta (°C)
Ta (°C)
tpLH vs. Ta
Cd (Rd) vs. tpLH
Rd=100k Cd=0.01µF (Mylar)
10.0
1.7
7
5
3
2
1.6
0
=1
d
R
1.0
Cd
(µF)
7
5
1.5
k
0k
0
=1
d
R
3
2
1.3
1.2
k
70
=4
Rd
0.1
7
5
3
2
0.01
tpLH 1.4
(mS)
1.1
-40
0
20
Ta (°C)
1
2 34 5 7 10
2 34 5 7 100
2 3 4 5 7 1000
tpLH (mS)
Pd vs. Ta
300
200
Pd
(mW)
100
0
-20
0
25
50
Ta
75
(°C)
100
125
40
60
80
System Reset PST575
MITSUMI
Timing Chart
7
6
5
VCC
VS
4
3
VCC/VOUT
(V)
2
VOUT
1
0
Variable
Time
Undefined
RESET
ON
OFF
Application Circuits
(Pin numbers are for an example of MMP-4P.)
1. Normal hard reset
Delay time (tPLH)
··1.3Cd Rd+0.007 (mS)
=
Cd : µF
Rd : kΩ
Note: Connect a capacitor between IC pins 1 and 2 if
VCC line impedance is high.
2. Manual reset added
Note: Use RL, CL and Rm to prevent manual switch
chattering. Connect a capacitor between IC
pins 1 and 2 if VCC line impedance is high.
MITSUMI
System Reset PST575
3. Battery checker (LED ON for high voltage)
Note: Connect a capacitor between IC pins 1 and 2 if
VCC line impedance is high.
4. Battery checker (LED ON for low voltage)
Note: Connect a capacitor between IC pins 1 and 2 if
VCC line impedance is high.
5. Hysteresis voltage UP method
When increasing hysteresis voltage for stable system
operation, determine RH as follows and connect
externally.
However, ICCH is -5000PPM/°C, so perform
temperature compensation at RH when using over a
wide temperature range.
Hysteresis voltage UP amount ( Vsup) is
·· RH ICCL
Vsup =
Total hysteresis voltage ( Vstotal) is
·· Vs+ Vsup
Vstotal =
(Operation will be destabilized is RH is raised too
much.)
Note: Connect a capacitor between IC pins 1 and 2 if
VCC line impedance is high.