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ADM803 Datasheet

  • ADM803

  • Microprocessor Supervisory Circuits in 3-Lead SC70 and SOT-2...

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ADM803/ADM809/ADM810
400
Benefits of a Very Accurate Reset Threshold
MAXIMUM TRANSIENT DURATION ( s)
350
300
250
200
150
100
ADM8_R/S/T/Z
50
0
1
10
100
RESET COMPARATOR OVERDRIVE, V
TH
鈥?V
CC
(mV)
1000
ADM8_L/M/J
In other microprocessor supervisory circuits, tolerances in supply
voltages lead to an overall increase in reset tolerance levels due
to the deterioration of the microprocessor reset circuit鈥檚 power
supply. The possibility of a malfunction during a power failure is
greatly reduced because the ADM803/ADM809/ADM810 series
can operate effectively even when there are large degradations
of the supply voltages. Another advantage of the ADM803/
ADM809/ADM810 series is its very accurate internal voltage
reference circuit. These benefits combine to produce an excep-
tionally reliable voltage monitor circuit.
Interfacing to Microprocessors with Multiple Interrupts
TPC 7. Maximum Transient Duration without Causing a
Reset Pulse vs. Reset Comparator Overdrive
In a number of cases, it is necessary to interface many interrupts
from different devices (e.g., thermal, altitude, and velocity sensors).
The ADM803/ADM809/ADM810 can easily be integrated into
existing interrupt-handling circuits (Figure 4) or be used as a
standalone device.
INTERFACING TO OTHER DEVICES鈥?OUTPUT
PRIORITY ENCODER
74LS147
V
CC
The ADM803/ADM809/ADM810 series is designed to integrate
with as many devices as possible and, therefore, has a standard
output dependent on V
CC
. This enables the part to be used in
both 3 V and 5 V or any nominal voltage within the minimum
and maximum specifications for V
CC
. Because of this design
approach, interfacing this device to other devices is simplified.
Ensuring a Valid Reset Output Down to V
CC
= 0 V
4-LINE BCD TO
MICROPROCESSOR
V
CC
ADM809
RESET
OTHER SENSING
DEVICES
When V
CC
falls below 0.8 V, the ADM803/ADM809鈥檚
RESET
no longer sinks current. A high impedance CMOS logic input
connected to
RESET
may, therefore, drift to undetermined
logic levels. To eliminate this problem, a 100 k鈩?resistor should
be connected from
RESET
to ground.
V
CC
GND
V
CC
Figure 4. Interfacing to Microprocessors with
Multiple Interrupts
ADM809
RESET
GND
Figure 3. Ensuring a Valid Reset Output Down
to V
CC
= 0 V
REV. C
鈥?鈥?/div>

ADM803相關(guān)型號PDF文件下載

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  • 英文版
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