MAX6351LTUT+T Maxim Integrated Products, MAX6351LTUT+T Datasheet - Page 7

• Manufacturer Part Number: MAX6351LTUT+T
• Description: IC SUPERVISOR MPU SOT23-6
• Manufacturer: Maxim Integrated Products
• Type: Multi-Voltage Supervisorr

Specifications of MAX6351LTUT+T

• Number Of Voltages Monitored: 2
• Output: Push-Pull, Totem Pole
• Reset: Active Low
• Reset Timeout: 100 ms Minimum
• Voltage - Threshold: 3.08V, 4.63V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-6
• Monitored Voltage: 1.8 V, 2.5 V, 3 V, 3.3 V, 5 V
• Undervoltage Threshold: 4.54 V, 3.03 V
• Overvoltage Threshold: 3.14 V, 4.72 V
• Output Type: Active Low, Push-Pull
• Manual Reset: Resettable
• Watchdog: No Watchdog
• Battery Backup Switching: No Backup
• Power-up Reset Delay (typ): 280 ms
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 1 V
• Supply Current (typ): 20 uA
• Maximum Power Dissipation: 695 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Power Fail Detection: No
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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.
7