參數(shù)資料
型號(hào)： R3131N26BC5-TR
廠商： Ricoh Co., Ltd.
英文描述： Low Voltage Detector with built-in Delay Circuit
中文描述： 低電壓檢測(cè)器內(nèi)置延遲電路
文件頁(yè)數(shù)： 20/32頁(yè)
文件大小： 273K
代理商： R3131N26BC5-TR
R3130N×××A/C, R3131N×××A/C
19
Operation of R3131N Series
V
DD
OUT
Pch
Ra
Rb
Nch
GND
Comparator
Vref
-
+
Delay
Circuit
Block Diagram
CMOS Output Type
OUT pin is connected to the drain
of Nch Tr. and Pch Tr. in this IC.
Nch Open Drain Output Type: I
OUT pin is connected to the drain
of Nch Tr. in this IC. (OUT pin should be
pulled up to V
DD
or an external voltage
level.)
Minimum Operating
Voltage(V
DDL
)
GND
Tdelay
GND
B
A
1
2
3
4
5
Supply
Voltage
(V
DD
)
Output
Voltage
(V
OUT
)
Detector Threshold(V
DET)
=Released Voltage
Operation Diagram
In the above diagram,
!
Output Voltage becomes equal to GND level.
"
When Supply Voltage is down to the detector threshold level (Point A), Vref
≥
V
DD
×
Rb/(Ra+Rb) is true. Then,
Output of the comparator is reversed, thus output voltage becomes equal to Supply Voltage (Nch Open Drain
Output type; equal to pull-up Voltage).
#
When Supply Voltage is lower than minimum operating voltage, Output of transistor is indefinite, therefore Out-
put is also indefinite.(Nch Open Drain Output type; Output voltage level is equal to pull-up voltage.)
$
Output Voltage is equal to Supply Voltage. (Nch Open Drain Output type; equal to pull-up Voltage.)
%
When Supply voltage is higher than Released Voltage (Point B), Vref
≤
V
DD
×
Rb/(Ra+Rb) is true. Then Output of
the comparator is reversed, thus Output Voltage becomes equal to GND level after the output delay time.
* There is no hysteresis range between Detector threshold and Released Voltage.
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