MITSUMI
IC for System Reset PST591~595
IC for System Reset
Monolithic IC PST591~595 Series
Outline
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.
Features
1. Fixed delay time setting by counter timer
Excellent delay time temperature characteristics ±800ppm/
°
C
2. Low operating limit voltage 0.65V typ.
3. Hysteresis voltage provided for detection voltage 50mV typ.
4. No-load current consumption I
CCL=300µA typ. ICCH=200µA typ.
5. 5 models are available for different delay times.
PST591 50ms PST594 400ms
PST592 100ms PST595 800ms
PST593 200ms
6. Each model has 9 detection voltage ranks. 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.
Packages
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
October 15, 2004
Products to be discontinued
MITSUMI
IC for System Reset PST591~595
Equivalent Circuit Diagram
Absolute Maximum Ratings
(Ta=25
°
C)
Pin Assignment
123
TO
-
92A
12
43
MMP
-
4A
(TOP VIEW)
1 VCC
2 GND
3 V
OUT
1 VOUT
2
Manual
Reset
3 V
CC
4 GND
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
Manual reset input voltage V
RES max.
-
0.3~10 V
Allowable loss Pd
200 (MMP-4P)
mW
300 (TO-92)
Products to be discontinued