MAX802RESA+ Maxim Integrated, MAX802RESA+ Datasheet - Page 7

• Manufacturer Part Number: MAX802RESA+
• Description: Supervisory Circuits
• Manufacturer: Maxim Integrated
• Series: MAX690R, MAX690S, MAX690T, MAX704R, MAX704S, MAX704T, MAX802, MAX802R, MAX802S, MAX802T, MAX804, MAX804R, MAX804S, MAX804T, MAX805, MAX805R, MAX805S, MAX805T, MAX806, MAX806R, MAX806S, MAX806Tr

Specifications of MAX802RESA+

• Number Of Voltages Monitored: 1
• Monitored Voltage: 1.1 V to 5.5 V
• Undervoltage Threshold: 2.59 V
• Overvoltage Threshold: 2.72 V
• Output Type: Active Low, Push-Pull
• Manual Reset: Not Resettable
• Watchdog: Watchdog
• Battery Backup Switching: Backup
• Power-up Reset Delay (typ): 200 ms
• Supply Voltage - Max: 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SOIC-8 Narrow
• Chip Enable Signals: No
• Maximum Power Dissipation: 471 mW
• Minimum Operating Temperature: - 40 C
• Power Fail Detection: Yes
• Supply Current (typ): 50 uA
• Supply Voltage - Min: 1.1 V

The MAX6351–MAX6360 microprocessor (µP) superviso-
ry circuits maintain system integrity by alerting the µP to
fault conditions. These ICs monitor multiple-supply sys-
tems. The output reset state is guaranteed to remain
viable while either V
All the possible input voltage threshold level combina-
tions are indicated by a two-letter code in the Voltage
Threshold Levels table.
Figure 1. Functional Diagram
(5) 6
(5)
(5)
4
2
NOTE: PIN 1 IS RST1 FOR THE MAX6351 AND RST FOR THE
MAX6352–MAX6360. PIN 5 IS RST2 FOR THE MAX6351, RSTIN
FOR THE MAX6355/MAX6356/MAX6357, WDI FOR THE MAX6358/
MAX6359/MAX6360, AND V
V
V
(RSTIN)
(WDI)
GND
CC
CC
1
2
1.22V
V
V
TH
TH
1
2
_______________________________________________________________________________________
CC
1 or V
Detailed Description
CC
1 FOR THE MAX6352/MAX6353/MAX6354.
CC
WATCHDOG
TIMER
2 is above +1V.
MAX6351–MAX6360
GENERATOR
Threshold Levels
MR
Supply Voltages
RESET
GLITCH
FILTER
3
RST2 (5)
RST1
RST (1)
(1)
µP Supervisory Circuits
The MAX6351 provides two active-low, push-pull reset
outputs, one corresponding to each of its two moni-
tored voltages. The MAX6353/MAX6356/MAX6359 have
an active-low, push-pull reset output that is referenced
to V
active-low, push-pull reset output that is referenced to
V
active-low open-drain reset. The reset outputs are
maintained as long as at least one of the supplies is
above +1V.
The MAX6351–MAX6360 are designed to ignore short
negative-going V
Maximum V
Overdrive graph in the Typical Operating Characteristics.
The MAX6355/MAX6356/MAX6357 provide an addition-
al input to monitor a third voltage. The threshold voltage
at RSTIN is typically 1.22V. To monitor a voltage higher
than 1.22V, connect a resistive divider to the circuit as
shown in Figure 2. The threshold at V
Note that RSTIN is powered by V
must therefore remain lower than or equal to V
The MAX6358/MAX6359/MAX6360 include a dual-
mode watchdog timer to monitor µP activity. The flexi-
ble timeout architecture provides a startup mode,
allowing complicated systems to complete lengthy
boots, and a normal mode, allowing the supervisor to
provide quick alerts when processor activity fails.
Figure 2. Monitoring a Third Voltage
CC
CC
2. The MAX6352/MAX6355/MAX6358 provide an
1. The MAX6354/MAX6357/MAX6360 have an
Dual/Triple-Voltage
V
EXT
CC
V
CC
V
1 ≥ V
Negative-Going V
EXT_TH
Transient Duration vs. Reset Threshold
(MAX6355/MAX6356/MAX6357)
(MAX6358/MAX6359/MAX6360)
RSTIN
CC
1 and V
R1
R2
=
1.22V
RSTIN
CC
Third Input Voltage
MAX6355
MAX6356
MAX6357



2 transients. See the
R1
CC
Watchdog Input
R2
EXT
Reset Outputs
+
CC
1, and its voltage
R2
is:
Transients



CC
1.
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