MAX16063 Datasheet, PDF (12/13 Pages) Maxim Integrated Products – 1% Accurate, Low-Voltage, Quad Window Voltage Detector

1% Accurate, Low-Voltage,
Quad Window Voltage Detector
Margin Output Disable (MARGIN)
MARGIN allows system-level testing while power sup-
plies are adjusted from their nominal voltages. Drive
MARGIN low to deassert all outputs (UVOUT_,
OVOUT_, and RESET) regardless of the voltage at any
monitored input. The state of each output does not
change while MARGIN = GND. While MARGIN is low,
the IC continues to monitor all voltages. When MARGIN
is deasserted, the outputs go to their monitored states
after a short propagation delay. The MARGIN input is
internally pulled up to V_CC. Leave unconnected or con-
nect to V_CC if unused.
Undervoltage Lockout (UVLO)
The MAX16063 features a V_CC undervoltage lockout
(UVLO) that preserves a reset status even if V_CC falls as
low as 1V. The undervoltage lockout circuitry monitors
the voltage at V_CC. If V_CC falls below the UVLO falling
threshold (typically 1.735V), RESET is asserted and all
detector outputs are asserted low. This eliminates an
incorrect RESET or detector output state as V_CC drops
below the normal V_CC operational voltage range of
1.98V to 5.5V.
During power-up as V_CC rises above 1V, RESET is assert-
ed and all detector outputs are asserted low until V_CC
exceeds the UVLO threshold. As V_CC exceeds the UVLO
threshold, all inputs are monitored and the correct output
state appears at all the outputs. This also ensures that
RESET and all detector outputs are in the correct state
once V_CC reaches the normal V_CC operational range.
Power-Supply Bypassing
In noisy applications, bypass V_CC to ground with a
0.1µF capacitor as close to the device as possible. In
addition, the additional capacitor improves transient
immunity. For fast-rising V_CC transients, additional
capacitance may be required.
12 ______________________________________________________________________________________