IC for System Reset PST591~595
MITSUMI
IC for System Reset
Monolithic IC PST591~595 Series
October 15, 2004
Outline
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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.
on
tin
±800ppm/°C
0.65V typ.
50mV typ.
ICCL=300µA typ. ICCH=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.
Packages
st
o
be
6. Each model has 9 detection voltage ranks.
di
sc
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.
ue
Features
PST594 400ms
PST595 800ms
H : 3.1V typ.
I : 2.9V typ.
J : 2.7V typ.
K : 2.5V typ.
Pr
od
*
uc
t
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.)
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
