EM6354
Typical Reset Timeout Period
The Reset Timeout Period (t
POR
) is programmable using an external capacitor connected to pin C
D
of EM6354. A ceramic
chip capacitor rated at or above 10V is sufficient. The Reset Timeout Period (t
POR
) can be calculated using the following
formula for V
TH
=4.63V (EM6354-4.6):
t
POR
(ms) = C
D
(nF).
For example a C
D
of 100nF will achieve a t
POR
of 100 ms. The tolerance of the capacitor should be taken into account. If no
delay due to t
POR
is needed in a certain application, the circuit EM6352 should be used instead.
For threshold voltage between V
TH
=4.63V and V
TH
=1.31V , the following graphic applies :
130
120
[ ms ]
110
100
1.31
2.93
V
TH
4.63
Typical Reset Timeout Period t
POR
vs. V
TH
for C
D
=100nF at T
A
=+25°C
[ms]
10000
VTH = 1.31 V
1000
VTH = 4.63 V
100
10
1
1
10
100
1000
10000
[nF]
Reset Timeout Period t
POR
vs. Capacitor C
D
at T
A
=+25°C
Copyright
©
2006, EM Microelectronic-Marin SA
03/06 – rev.I
5
www.emmicroelectronic.com
EMMICRO [ EM MICROELECTRONIC - MARIN SA ]
