MITSUMI
System Reset PST575
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 ICCH=7.5µA typ. ICCL=400µA typ.
2. Low operating limit voltage 0.65V typ.
3. Output current high for ON 30mA typ.
4. Hysteresis voltage provided in detection voltage 50mV typ.
5. Delay time can set over a wide range using
external capacitor and resistor. 10µS~10S
6. 10 ranks of detection voltage PST575 C : 4.5V typ. H : 3.1V typ.
D : 4.2V typ. I : 2.9V typ.
E : 3.9V typ. J : 2.7V typ.
F : 3.6V typ. K : 2.5V typ.
G : 3.3V 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
1234
8567
DIP
-
8A
12
43
MMP
-
4A
3 GND
4 Cd
5 V
OUT
7 VCC
1 VCC
2 VOUT
3 Cd
4 GND
Products to be discontinued
MITSUMI
System Reset PST575
Equivalent Circuit Diagram
Absolute Maximum Ratings
(Ta=25
°
C)
Electrical Characteristics
(Ta=25
°
C) (Except where noted otherwise, resistance unit is Ω)
*
1 : tpLH : V
CC
= (V
S
typ.
-
0.4V) (V
S
typ.+0.4V), tpHL : V
CC
= (V
S
typ.+0.4V) (V
S
typ.
-
0.4V), C
L
=100pF
*
2: VCC=VS min.
-
0.15V
Item Symbol Rating Units
Storage temperature T
STG
-
40~+125
°
C
Operating temperature T
OPR
-
20~+75
°
C
Power supply voltage V
CC max.
-
0.3~10 V
Allowable loss Pd
200 (MMP-3A)
mW
300 (TO-92A)
Item Symbol
Measuring circuit
Measurement conditions Min. Typ. Max. Units
PST575C 4.3 4.5 4.7
PST575D 4.0 4.2 4.4
PST575E 3.7 3.9 4.1
R
L=470
PST575F 3.4 3.6 3.8
Detection voltage V
S 1VOL
<
=
0.4V
PST575G 3.1 3.3 3.5
V
V
CC=H L
PST575H 2.9 3.1 3.3
PST575I 2.75 2.90 3.05
PST575J 2.55 2.70 2.85
PST575K 2.35 2.50 2.65
PST575L 2.15 2.30 2.45
Hysteresis voltage V
S 1RL=470, VCC=L H L 25 50 100 mV
Detection voltage
temperature coefficient
V
S/ T 1
R
L
=470, Ta=
-
20
°
C
~+75
°
C
±0.01
%/
°
C
Low-level output voltage V
OL 1
V
CC
=Vs min.
-
0.05V, R
L
=470
0.1 0.4 V
Output leakage current I
OH 1VCC=7.5V ±0.1 µA
Circuit current while on I
CCL 1
V
CC
=Vs min.
-
0.05V, R
L
=∞
400 650 µA
Circuit current while off I
CCH 1VCC=Vs typ./0.85V, RL=∞ 7.5 12.0 µA
"H" transport delay time tpLH 2 Rd=100k, Cd=0.01µF
*
1 0.75 1.25 1.75 mS
"L" transport delay time tpHL 2 Rd=100k, Cd=0.01µF
*
1620µS
Operating power supply voltage
VopL 1 RL=4.7kΩ, VOL
<
=
0.4V 0.65 0.85 V
Output current while on II
OL I1
V
CC
=Vs min.
-
0.05V, R
L
=0
830 mA
Output current while on II I
OL II 1
Ta=
-
20
°
C
~+75
°
C
, R
L
=0
*
2
5mA
Threshold voltage for delay
Vtsh 1
V
CC
=5.0V, Rd=100k, Cd=0.01µF
3.5 3.7 3.9 V
time setting comparator (CO2)
RL=4.7k, CL=100pF
Products to be discontinued