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PDF PST3352 Data sheet ( Hoja de datos )
| Número de pieza | PST3352 | |
| Descripción | CMOS System Reset | |
| Fabricantes | ETC | |
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MITSUMI
CMOS System Reset PST3XXX
CMOS System Reset
Monolithic IC PST3XXX Series
Outline
This IC is a system reset IC developed using the CMOS process. Super low consumption current of 0.25µA
typ. has been achieved through use of the CMOS process. Also, detection voltage is high precision detection
of ±2%.
Features
(1) Super low consumption current
(2) High precision detection voltage
(3) Hysteresis characteristic
(4) Operating range
(5) Wide operating temperature range
(6) Detection voltage
Package
SC-82AB (PST31XX, PST32XX)
SOT-25 (PST33XX, PST34XX)
Applications
(1) Microcomputer, CPU, MPU reset circuits
(2) Logic circuit reset circuits
(3) Battery voltage check circuits
(4) Back-up circuit switching circuits
(5) Level detection circuits
Pin Assignment
0.25µA typ. (when VDD = Vs + 1V)
±2%
5% typ.
0.95 ~ 10V
-30 ~ +85°C
2 ~ 6V (0.1V step)
54
123
SC-82AB
1 OUT
2 VDD
3 VSS
4 NC
5
43
12
SOT-25
1 OUT
2 VDD
3 NC
4 VSS
1 page  
MITSUMI
Description of Operation
CMOS System Reset PST3XXX
(1) VDD > VS, VOUT: H (M1: ON, M2, M3: OFF)
When VDD is gradually lowered from the above state, detection voltage is as follows.
Detection voltage: (R1 + R2 + R3) / (R2 + R3) VREF
(2) VDD < VS, VOUT: L (M1: OFF, M2, M3: ON)
When VDD is gradually raised from the above state, release voltage is as follows.
Release voltage = (R1 + R2) / (R2) VREF
(3) Hysteresis voltage = (release voltage) - (detection voltage).
(4) When VDD drops and goes below the minimum operating voltage, output is undefined; when output is
pulled up, output becomes VDD.
(5) VREF and detection resistors
1) The reference voltage source (VREF) for this IC is 0.8V typ. This gives excellent low power consumption
and temperature characteristics.
2) The high resistance process is used for resistors R1, R2 and R3 to achieve low consumption current for
the IC.
(6) Through current flows momentarily for detection and release. When using high VDD pin impedance, the
through current may cause oscillation.
(Example) Detection voltage changed by external settings
* The IC input voltage fluctuates due to the
through current R11 voltage drop, and
an oscillation state where detection and
release are repeated may occur.
* With CMOS output types, do not use as
shown in the diagram at left.
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet PST3352.PDF ] | |
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