ADM6711MAKS-REEL7 Analog Devices Inc, ADM6711MAKS-REEL7 Datasheet - Page 8

• Manufacturer Part Number: ADM6711MAKS-REEL7
• Description: IC SUPERVISOR P/P 4.38V SC70-4
• Manufacturer: Analog Devices Inc
• Type: Simple Reset/Power-On Resetr

Specifications of ADM6711MAKS-REEL7

• Rohs Status: RoHS non-compliant
• Number Of Voltages Monitored: 1
• Output: Push-Pull, Totem Pole
• Reset: Active Low
• Reset Timeout: 140 ms Minimum
• Voltage - Threshold: 4.38V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: SC-70-4, SC-82-4, SOT-323-4, SOT-343

ADM6711/ADM6713
CIRCUIT DESCRIPTION
The ADM6711/ADM6713 are designed to protect the integrity
of a system’s operation by ensuring the proper operation of the
system during power-up, power-down, and brownout conditions.
When the ADM6711/ADM6713 are powered up, the RESET
output remains low for a period equal to the typical reset active
timeout period. This is designed to give the system time to
power up correctly and for the power supply to stabilize before
any devices are brought out of reset and allowed to begin
executing instructions. Initializing a system in this way provides
a more reliable startup for microprocessor systems.
MANUAL RESET INPUT
The ADM6711/ADM6713 manual reset ( MR ) input allows the
system operator to reset a system by means of an external
manual switch. Alternatively, a logic signal from another digital
circuit can be used to trigger a reset via the MR input.
The MR input ignores negative-going pulses faster than 100 ns
(typical) and is guaranteed to accept any negative-going input
pulse of a duration greater than or equal to 1 μs. The RESET
output remains low while MR is held low and for 240 ms
(typical) after MR returns high.
If MR is connected to long cables or is used in a noisy environ-
ment, then placing a 0.1 μF capacitor between the MR input
and ground helps to remove any fast, negative-going transients.
POWER SUPPLY GLITCH IMMUNITY
The ADM6711/ADM6713 contain internal filtering circuitry
that provides immunity to fast transient glitches on the power
supply line. Figure 9 illustrates glitch immunity performance by
showing the maximum transient duration without causing a reset
pulse for glitches with amplitudes in the range of 1 mV to 1000 mV.
Glitch immunity makes the ADM6711/ADM6713 suitable for
use in noisy environments. Mounting a 0.1 μF decoupling
capacitor as close as possible to the V
immunity further.
CC
pin improves glitch
Rev. A | Page 8 of 12
ADM6713 RESET OUTPUT LOGIC LEVELS
The ADM6713 open-drain RESET output is designed for use
with an external pull-up resistor. This resistor can be tied to V
or any other reasonable voltage level, offering the flexibility
to use the ADM6713 to drive a variety of different logic level
circuitry.
ENSURING A VALID RESET OUTPUT DOWN TO
V
When V
output no longer sinks current, and a high impedance CMOS
logic input connected to RESET may drift to undetermined
logic levels. To eliminate this problem, a pull-down resistor is
connected from RESET to ground. A 100 kΩ resistor is large enough
not to load RESET and small enough to pull RESET to ground.
CC
V
= 0 V
MR
CC
Figure 10. Ensuring a Valid RESET Output Down to V
CC
falls below 0.8 V, the ADM6711/ADM6713 RESET
V
REF
ADM6711
DEBOUNCE
ADM6711
GND
V
V
CC
CC
RESET
GENERATOR
RESET
240ms
100kΩ
CC
= 0 V
RESET
GND
CC