NJU7704 New Japan Radio Co.,Ltd, NJU7704 Datasheet - Page 10

• Manufacturer Part Number: NJU7704
• Description: Voltage Detector
• Manufacturer: New Japan Radio Co.,Ltd

NJU7704/05
(1) Basic Operation
(2) Description of Delay Time
- 10 -
FUNCTIONAL DESCRIPTION
Minimum operation
Detection voltage
Delay time can be set by the external capacitor. The delay time is given by the following:
voltage (V
(*8): C-MOS output product (NJU7705) : When V
(V
DET
Supply voltage
Output voltage
V
V
)
SS
SS
OPL
(V
)
(V
OUT
DD
)
)
External delay capacitor (nF) = Required delay time : td(ms) / 10(ms) x 4.7(nF)
10000
1000
0.01
100
0.1
10
1
0.001
Hysteresis voltage
NJU7704/05 Delay time vs Delay Capacitor (Cd)
(V
HYS
)
0.01
Delay time
Delay Capacitor : Cd(nF)
Release voltage
0.1
(V
DD
DET
less than V
+ V
HYS
)
1
(1) When supply voltage(V
(2) The reset state is kept while V
(3) When V
(*7) V
OPL
detection voltage(V
changes "H" to "L" to alert reset state.
release voltage. The release voltage is a sum
of V
refer to the (*7) below.
voltage and reset release delay time set by
the external capacitors is past, then V
changes from "L" to "H" to resume normal
state.
by rapid voltage change at nearby V
, V
HYS
OUT
DET
10
is to avoid unstable V
is free of the shaded region.
and Hysterisis voltage (V
DD
becomes higher than the release
100
DET
), Output voltage(V
DD
1000
OUT
) drops below
DD
state caused
is lower than
HYS
Ver.2008-07-04
DET
). Please
.
OUT
OUT
)