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MAX6356 Datasheet(PDF) 7 Page - Maxim Integrated Products

Part No. MAX6356
Description  Dual/Triple-Voltage μP Supervisory Circuits
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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MAX6356 Datasheet(HTML) 7 Page - Maxim Integrated Products

 
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Dual/Triple-Voltage
µP Supervisory Circuits
_______________________________________________________________________________________
7
Detailed Description
Supply Voltages
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 VCC1 or VCC2 is above +1V.
Threshold Levels
All the possible input voltage threshold level combina-
tions are indicated by a two-letter code in the Voltage
Threshold Levels table.
Reset Outputs
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 VCC1. The MAX6354/MAX6357/MAX6360 have an
active-low, push-pull reset output that is referenced to
VCC2. The MAX6352/MAX6355/MAX6358 provide an
active-low open-drain reset. The reset outputs are
maintained as long as at least one of the supplies is
above +1V.
Negative-Going VCC Transients
The MAX6351–MAX6360 are designed to ignore short
negative-going VCC1 and VCC2 transients. See the
Maximum VCC Transient Duration vs. Reset Threshold
Overdrive graph in the Typical Operating Characteristics.
Third Input Voltage
(MAX6355/MAX6356/MAX6357)
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 VEXT is:
Note that RSTIN is powered by VCC1, and its voltage
must therefore remain lower than or equal to VCC1.
Watchdog Input
(MAX6358/MAX6359/MAX6360)
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.
V
1.22V
R1
R2
R2
EXT_TH =
+


WATCHDOG
TIMER
VCC1
(5) 6
4
(5)
(5)
2
GND
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 VCC1 FOR THE MAX6352/MAX6353/MAX6354.
VCC2
MR
(RSTIN)
RST (1)
RST2 (5)
(1)
RST1
(WDI)
RESET
GENERATOR
GLITCH
FILTER
MAX6351–MAX6360
VTH1
VTH2
1.22V
3
Figure 1. Functional Diagram
Figure 2. Monitoring a Third Voltage
VEXT
R1
R2
VCC1
≥ VRSTIN
RSTIN
MAX6355
MAX6356
MAX6357


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