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參數(shù)資料
| 型號： | R3115Z |
| 廠商： | Ricoh Co., Ltd. |
| 英文描述： | LOW VOLTAGE DETECTOR WITH OUTPUT DELAY |
| 中文描述： | 低的電壓檢測器輸出延遲 |
| 文件頁數(shù)： | 8/28頁 |
| 文件大?。?/td> | 821K |
| 代理商： | R3115Z |
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R3115Z
OPERATION
8
Current
Source
Rd
Rb
Rc
Vref
Tr.1
Tr.2
C
D
Nch
Pch
V
DD
OUT
GND
Schmitt Trigger
Comparator
Ra
Fig. 1 Block Diagram with an external capacitor
Released Voltage
+
V
DET
Detector Threshold
V
DET
1
2
3
4
5
Supply Voltage(V
DD
)
Minimum Operating
V
DEL
Voltage
GND
Output Voltage(OUT)
GND
A
B
HYSTERESIS
RANGE
Delay
Time
Operation Status
1
2
3
4
5
Compartor (
) Pin
Input Voltage
Compartor Output
L
H
Indefinite
ON OFF
Tr.1,2
OFF ON
Indefinite
ON OFF
Nch
OFF ON
Indefinite
ON OFF
Output
Tr.
Pch
ON OFF
Indefinite
OFF ON
×
V
DD
Ra
+
Rb
+
Rc
Rb
+
Rc
×
V
DD
Rb
Ra
+
Rb
Fig. 2 Operation Diagram
1. Output voltage is equal to supply voltage. (As for Nch open drain type, equal to pull-up voltage.)
2. When the supply voltage is down to the detector threshold voltage level(Point A),
Vref
>
=
V
DD
×
(
Rb
+
Rc)/(Ra
+
Rb
+
Rc) is true, then output of the comparator is reversed from “L” to “H”, therefore
output voltage becomes GND level.
3. When the supply voltage is lower than minimum operating voltage, the operation of output transistor is
indefinite. In the case of Nch open drain type, output voltage is equal to pull-up voltage.
4. Output Voltage becomes GND level.
5. When the supply voltage is higher than released voltage (Point B), Vref
<
output of the comparator reaches the threshold level, and Output of Shmitt Trigger is reversed from “H” to
“L”, then output voltage is equal to supply voltage. (As for Nch open drain type, equal to pull-up voltage.)
) The difference between released voltage and detector threshold voltage means hysteresis range voltage.
=
V
DD
×
Rb/(Ra
+
Rb) is true, then
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