ADM6711 Analog Devices, ADM6711 Datasheet - Page 8

• Manufacturer Part Number: ADM6711
• Description: Microprocessor Supervisory Circuit in 4-Lead SC70
• Manufacturer: Analog Devices

Specifications of ADM6711

• # Of Monitored Voltages: 1
• Backup-battery Switch: No
• Manual Reset Capability: Yes
• Package: SC70
• Reset Threshold Summary: 6 Options--2.32 to 4.63V
• Reset Output-stage: Active-Low/Push-Pull
• Min Reset Timeout (ms): 140
• Watchdog Timer: No

ADM6711/ADM6713
CIRCUIT DESCRIPTION
The
of a system’s operation by ensuring the proper operation of the
system during power-up, power-down, and brownout conditions.
When the
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
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 environment,
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
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
use in noisy environments. Mounting a 0.1 μF decoupling
capacitor as close as possible to the V
immunity further.
ADM6711/ADM6713
ADM6711/ADM6713
ADM6711/ADM6713
ADM6711/ADM6713
are designed to protect the integrity
manual reset ( MR ) input allows the
contain internal filtering circuitry
ADM6711/ADM6713
are powered up, the RESET
CC
pin improves glitch
suitable for
Rev. B | Page 8 of 12
ADM6713 RESET OUTPUT LOGIC LEVELS
The
an external pull-up resistor. This resistor can be tied to V
any other reasonable voltage level, offering the flexibility to use
the
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
ADM6713
V
ADM6713
= 0 V
MR
CC
Figure 10. Ensuring a Valid RESET Output Down to V
CC
falls below 0.8 V, the
V
REF
ADM6711
to drive a variety of different logic level circuitry.
open-drain RESET output is designed for use with
DEBOUNCE
ADM6711
GND
V
V
CC
CC
RESET
GENERATOR
RESET
240ms
ADM6711/ADM6713
100kΩ
Data Sheet
CC
= 0 V
RESET
GND
RESET
CC
or