MAX8215EPD Maxim Integrated, MAX8215EPD Datasheet - Page 9

• Manufacturer Part Number: MAX8215EPD
• Description: Supervisory Circuits
• Manufacturer: Maxim Integrated
• Series: MAX8215, MAX8216r

Specifications of MAX8215EPD

• Number Of Voltages Monitored: 5
• Monitored Voltage: - 12 V, - 5 V, 5 V, 12 V
• Undervoltage Threshold: 4.521 V, 10.431 V, - 10.431 V, - 4.348 V
• Overvoltage Threshold: 4 V, 10.749 V, - 10.749 V, - 4.482 V
• Output Type: Open Drain
• Manual Reset: Not Resettable
• Watchdog: No Watchdog
• Battery Backup Switching: No Backup
• Supply Voltage - Max: 11 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• Package / Case: PDIP N
• Chip Enable Signals: No
• Maximum Power Dissipation: 800 mW
• Minimum Operating Temperature: - 40 C
• Power Fail Detection: No
• Supply Current (typ): 250 uA
• Supply Voltage - Min: 2.7 V

Figure 7. Microprocessor Reset Circuit Monitoring Its Own
Supply Voltage
absolute maximum ratings have no effect on the refer-
ence. Within the absolute maximum ratings, the DIN
input has no effect on the reference.
In high-noise environments where the voltage connected
to V
“bounce,” causing false comparator outputs. Eliminate
this problem using Figure 8’s RC bypass network.
Although bypassing the reference may appear to help,
Figure 8’s solution is recommended; bypassing the ref-
erence reduces its voltage change, but doing so caus-
es a time delay prior to the reference voltage returning
to its correct level.
Although hysteresis is built into the auxiliary comparator,
output oscillation problems are still possible. Oscillation
can occur when a comparator’s output couples back to
its inverting input through stray board capacitance.
Make sure the board trace leading from the comparator
output does not pass near its inverting input (or vice
versa). Also, reducing the resistance connected to DIN
reduces its susceptibility to picking up output signals. In
+V
S
DD
Power-Supply Bypassing and Grounding
may change abruptly, the reference voltage may
Eliminating Output Oscillation when
1 F
3
7
2
DIN
GND
+5V
Using the Auxiliary Comparator
_______________________________________________________________________________________
MAX8215
MAX8216
0.1 F
PGND
8
DOUT
OUT1
V
DD
13
9
14
1k
Microprocessor Voltage Monitors
+5V
680k
680k
±5V, ±12V (±15V) Dedicated
RESET
most cases, using input resistor values on the order of
100k
values increases the supply current, another approach
is to bypass the input resistors as shown in Figure 9,
although this slows the circuit’s response. When much
larger valued input resistors are used, high valued resis-
tors on the output should be used.
When DOUT is required to sink larger currents (i.e.,
when smaller pull-up resistor values are used), oscilla-
tion problems are more likely to occur. To minimize
power consumption and to optimize stability, use the
largest value pull-up resistor feasible for the output
drive required. When lower pull-up resistor values are
used, lower values for the resistors connected to the
inputs can help alleviate oscillation problems.
Figure 8. Alternate Bypass Scheme
Figure 9. Alternative Means for Reducing Impedance Level
Seen at DIN
V
IN
creates no problem. Since using lower resistor
0.1 F
V+
7
MAX8215
MAX8216
1k
14
DIN
V
DD
MAX8215
MAX8216
OUT1
13
DOUT
9
9