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参数资料
| 型号： | PST3439U |
| 厂商： | MITSUMI ELECTRIC CO LTD |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO4 |
| 封装： | SC-82AB, 4 PIN |
| 文件页数： | 5/9页 |
| 文件大小： | 92K |
| 代理商： | PST3439U |
MITSUMI
CMOS System Reset PST31XX~34XX
Description of Operation
(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.
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相关代理商/技术参数 |
参数描述 |
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| PST3440 | 制造商:MITSUMI 制造商全称:Mitsumi Electronics, Corp. 功能描述:IC for CMOS System Reset |
| PST3441 | 制造商:MITSUMI 制造商全称:Mitsumi Electronics, Corp. 功能描述:IC for CMOS System Reset |
| PST3442 | 制造商:MITSUMI 制造商全称:Mitsumi Electronics, Corp. 功能描述:IC for CMOS System Reset |
| PST3443 | 制造商:MITSUMI 制造商全称:Mitsumi Electronics, Corp. 功能描述:IC for CMOS System Reset |
| PST3444 | 制造商:MITSUMI 制造商全称:Mitsumi Electronics, Corp. 功能描述:IC for CMOS System Reset |
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