On/Off Controller with Debounce and
15ꢀk ꢁED ꢂrotection
MAX16054
V
CC
UVLO
IN
t
t
t
DP
DP
DP
t
t
DP
DP
OUTPUT OF D
FLIP-FLOP
(INVERTED
IN AFTER
t
CO
DEBOUNCE)
OUT
CLEAR
Figure 1. MAX16054 Timing Eiagram
ꢀ
rises aboꢁe normal leꢁels. In some low-current sys-
Undervoltage Locꢀout
CC
tems, a zener diode on ꢀ
may be required.
The underꢁoltage-locꢂout circuitry ensures that the out-
CC
puts are at the correct state on power-up. While ꢀ
is
CC
15ꢀk ꢁED ꢂrotection
less than the ±.1ꢀ (typ) underꢁoltage threshold and
greater than 1.0ꢀ, OUT remains low and transitions at
IN are ignored.
VꢃE-protection structures are incorporated on all pins
to protect against electrostatic discharges encountered
during handling and assembly. The MAX16054 has
extra protection against static electricity to protect
against VꢃE of ±15ꢂꢀ at the switch input without dam-
age. The VꢃE structures withstand high VꢃE in all
states: normal operation, shutdown, and powered
down. A design adꢁantage of the MAX16054 is that it
continues worꢂing without latchup after an VꢃE eꢁent,
which eliminates the need to power-cycle the deꢁice.
Robust Ewitch Input
The switch input (IN) has oꢁerꢁoltage clamping diodes to
protect against damaging fault conditions. ꢃwitch input
ꢁoltages can safely swing ±±5ꢀ to ground. Proprietary
VꢃE-protection structures protect against high VꢃE
encountered in harsh industrial enꢁironments, membrane
ꢂeypads, and portable applications. They are designed
to withstand ±15ꢂꢀ per the IVC 61000-4-± Air-Gap
Eischarge test and ±8ꢂꢀ per the IVC 61000-4-± Contact-
Eischarge test.
VꢃE protection can be tested in ꢁarious ways; this
product is characterized for protection to the following
limits:
ꢃince there is a 63ꢂΩ (typ) pullup resistor connected to
1) ±15ꢂꢀ using the Human Body Model.
IN, driꢁing the input to -±5ꢀ draws approximately 0.5mA
±) ±8ꢂꢀ using the Contact-Eischarge method specified
in IVC 61000-4-±.
from the ꢀ
supply. Eriꢁing the input to +±5ꢀ causes
CC
approximately 0.3±mA of current to flow bacꢂ into the
supply. If the total system ꢀ supply current is
3) ±15ꢂꢀ using the IVC 61000-4-± Air-Gap method.
ꢀ
CC
CC
less than the current flowing bacꢂ into the ꢀ
supply,
CC
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