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參數(shù)資料
| 型號(hào)： | 88C50-AF5-R |
| 廠商： | 友順科技股份有限公司 |
| 英文描述： | BUILT-IN DELAY CIRCUIT HIGH-PRECISION VOLTAGE DETECTOR |
| 中文描述： | 內(nèi)置延遲電路高精度電壓檢測(cè)器 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 227K |
| 代理商： | 88C50-AF5-R |
88CXX
CMOS IC
UNISONIC TECHNOLOGIES CO., LTD
9
www.unisonic.com.tw
QW-R502-040,A
OPERAT ION
1. Basic operation: CMOS active low output
(1) When power supply voltage V
DD
is greater than the release voltage +V
DET
, the Nch transistor is OFF and the
Pch transistor ON, causing V
DD
(high) to appear at the output.
(2) When power supply voltage V
DD
goes below +V
DET
, the output maintains the power supply voltage level, as
long as V
DD
remains above the detection voltage -V
DET
. When V
DD
does fall below -V
DET
(A in Figure 7),
the Nch
transistor goes ON the Pch transistor goes OFF, and V
SS
appears at the output.
(3) When V
DD
falls below the minimum operating voltage, the output becomes undefined. However, output will
revert to V
DD
if a pull-up has been employed.
(4) V
SS
will again be output when V
DD
rises above the minimum operating voltage. V
SS
will continue to be output
even when V
DD
surpasses -V
DET
, as long as it does not exceed the release voltage +V
DET
.
(5) When V
DD
rises above +V
DET
(B in Figure 7),
the Nch transistor goes OFF the Pch transistor goes ON, and V
DD
appears at the output. Then V
DD
at the OUT terminal appears with delay time (td) due to delay circuit.
*Parasitic diode
V
REF
*
C
D
OUT
Delay
circuit
*
N
RC
RB
RA
+
-
C
D
C
D
Nch
Pch
Figure 6
A
B
Hysteresis
width(V
HYS
)
Release voltage (+V
DET
)
Detection voltage (-V
DET
)
Min.operating voltage
V
ss
OUT terminal output
V
DD
V
ss
td
Figure 7
(1)
(2)
(3)
(4)
(5)
V
DD
V
ss
V
DD
2. Delay circuit
The delay circuit outputs the signal delayed from the release voltage (+V
DET
) point of the power voltage V
DD
rising. The output signal is not delayed when the V
DD
goes down the detection voltage (-V
DET
) or less. (See Figure 7).
The delay time (td) is determined by the time constant of the built-in constant current (approx. 100nA in the case
of products with detection voltage of 1.5V or more, approx. 570nA in the case of products with detection voltage of
1.4V or less) and the attached external capacitor (C
D
), and calculated from the following formula.
td (ms) = Delay factor×C
D
(nF)
Delay factor: (25
)
Products with detection voltage of 1.4V or less: Min.0.57, Typ.0.77, Max.0.96
Products with detection voltage of 1.5V or more: Min.3.8, Typ. 5.1, Max.6.4
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| 88C50L-AF5-R | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:BUILT-IN DELAY CIRCUIT HIGH-PRECISION VOLTAGE DETECTOR |
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| 88C51L-AF5-R | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:BUILT-IN DELAY CIRCUIT HIGH-PRECISION VOLTAGE DETECTOR |
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