EM6325
Timing Waveforms
V
DD
V
TH
t
SEN
V
HYS
Overdrive
0.8V
t
logic "1"
MR
logic "0"
t
logic "1"
RESET
logic "0"
t
logic "1"
RESET
logic "0"
t
t
POR
t
POR
t
MD
t
P
t
PMD
Note 6:
t
SEN
= Maximum Transient Duration. Please refer to figure on the next page.
Note 7:
Overdrive = V
TH
-V
DD
. Please refer to figure on the next page.
Manual Reset Input
A logic low on
MR
asserts a reset. Reset remains asserted while
MR
is low, and for t
POR
(200ms nominal for EM6325C) after
it returns high.
MR
has an internal 15kΩ pull-up resistor, so it can be left open if unused. This input can be driven with
CMOS logic levels or with open-drain outputs. Connect a normally open momentary switch from
MR
to V
SS
to create a
manual-reset function; debounce circuitry is integrated. If
MR
is driven from long cable or the device is used in a noisy
environment, connect a 0.1μF capacitor from
MR
to V
SS
to provide additional noise immunity (stronger external additional
pull-up resistor can also be added).
Copyright
©
2005, EM Microelectronic-Marin SA
5
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EMMICRO [ EM MICROELECTRONIC - MARIN SA ]
