ADM812 Analog Devices, ADM812 Datasheet - Page 8

• Manufacturer Part Number: ADM812
• Description: Microprocessors Supervisory Circuit in 4-Lead SOT-143, Logic High RESET Output
• Manufacturer: Analog Devices

Specifications of ADM812

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

ADM811/ADM812
INTERFACING TO OTHER DEVICES
OUTPUT
The ADM811/ADM812 are designed to integrate with as many
devices as possible. One feature of the ADM811/ADM812 is the
reset output, which is directly proportional to V
anteed only while V
to be used with both 3 V and 5 V, or any nominal voltage within
the minimum and maximum specifications for V
BENEFITS OF A VERY ACCURATE RESET
THRESHOLD
Because the ADM811/ADM812 can operate effectively even
when there are large degradations of the supply voltages, the
possibility of a malfunction during a power failure is greatly
reduced. Another advantage of the ADM811/ADM812 is its
very accurate internal voltage reference circuit. Combined,
these benefits produce an exceptionally reliable microprocessor
supervisory circuit.
CC
is greater than 1 V). This enables the part
CC
CC
(this is guar-
.
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ENSURING A VALID RESET/RESET
OUTPUT DOWN TO V
When V
ADM812 no longer sinks current. Therefore, a high impedance
CMOS logic input connected to RESET /RESET can drift to
undetermined logic levels. To eliminate this problem, a 100 kΩ
resistor should be connected from RESET /RESET to ground.
Figure 11. Ensuring a Valid RESET Output Down to V
CC
falls below 0.8 V, the RESET /RESET of the ADM811/
ADM811
GND
V
V
CC
CC
CC
RESET
= 0 V
CC
= 0 V