MAX6747KA31+T Maxim Integrated Products, MAX6747KA31+T Datasheet - Page 11

• Manufacturer Part Number: MAX6747KA31+T
• Description: IC RESET MPU W/ADJ RESET SOT23-8
• Manufacturer: Maxim Integrated Products
• Type: Simple Reset/Power-On Resetr

Specifications of MAX6747KA31+T

• Number Of Voltages Monitored: 1
• Output: Open Drain or Open Collector
• Reset: Active Low
• Reset Timeout: Adjustable/Selectable
• Voltage - Threshold: 3.075V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-8
• Monitored Voltage: 1.575 V to 5 V
• Output Type: Active Low, Open Drain
• Manual Reset: Resettable
• Watchdog: Watchdog
• Battery Backup Switching: No Backup
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 1 V
• Supply Current (typ): 5 uA
• Maximum Power Dissipation: 714 mW
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Power Fail Detection: No
• Undervoltage Threshold: 3.014 V
• Overvoltage Threshold: 3.137 V
• Power-up Reset Delay (typ): 9.487 ms
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MAX6747KA31+T; MAX6747KA31+TTR

The open-drain RESET output can be used to interface
to a µP with other logic levels. As shown in Figure 6, the
open-drain output can be connected to voltages from 0
to 6V.
Generally, the pullup resistor connected to the RESET
connects to the supply voltage that is being monitored
at the IC’s V
the open-drain output to level-shift from the monitored
supply to reset circuitry powered by some other supply.
Keep in mind that as the supervisor’s V
towards 1V, so does the IC’s ability to sink current at
RESET. Also, with any pullup resistor, RESET is pulled
high as V
this occurs depends on the pullup resistor value and
the voltage to which it is connected.
Figure 7. Ensuring RESET Valid to V
µP Reset Circuits with Capacitor-Adjustable
CC
CC
Interfacing to Other Voltages for
decays toward zero. The voltage where
pin. However, some systems can use
______________________________________________________________________________________
MAX6746
MAX6748
MAX6450
MAX6752
GND
RESET
V
CC
Logic Compatibility
CC
V
CC
= 0V
100kΩ
Reset/Watchdog Timeout Delay
CC
decreases
When V
ities decline drastically. The high-impedance CMOS-
logic inputs connected to RESET can drift to undeter-
mined voltages. This presents no problems in most
applications, since most µPs and other circuitry do not
operate with V
In those applications where RESET must be valid down
to 0V, add a pulldown resistor between RESET and
GND for the MAX6746/MAX6748/MAX6750/MAX6752
push/pull outputs. The resistor sinks any stray leakage
currents, holding RESET low (Figure 7). The value of the
pulldown resistor is not critical; 100kΩ is large enough
not to load RESET and small enough to pull RESET to
ground. The external pulldown can not be used with
the open-drain reset outputs.
Ensuring a Valid RESET Down to V
CC
falls below 1V, RESET current sinking capabil-
CC
below 1V.
(Push-Pull RESET )
CC
= 0V
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