MAX6422US37-T Maxim Integrated, MAX6422US37-T Datasheet - Page 4

• Manufacturer Part Number: MAX6422US37-T
• Description: Supervisory Circuits
• Manufacturer: Maxim Integrated
• Series: MAX6340, MAX6421, MAX6422, MAX6423, MAX6424, MAX6425, MAX6426r

Specifications of MAX6422US37-T

• Number Of Voltages Monitored: 1
• Monitored Voltage: 1.6 V to 5 V
• Undervoltage Threshold: 3.608 V
• Overvoltage Threshold: 3.793 V
• Output Type: Active High, Push-Pull
• Manual Reset: Not Resettable
• Watchdog: No Watchdog
• Battery Backup Switching: No Backup
• Power-up Reset Delay (typ): 4.375 ms
• Supply Voltage - Max: 5.5 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Package / Case: SOT-143
• Chip Enable Signals: No
• Maximum Power Dissipation: 320 mW
• Minimum Operating Temperature: - 40 C
• Power Fail Detection: No
• Supply Current (typ): 2.5 uA
• Supply Voltage - Min: 1 V

Low-Power, SC70/SOT µP Reset Circuits with
Capacitor-Adjustable Reset Timeout Delay
The reset output is typically connected to the reset input
of a µP. A µP’s reset input starts or restarts the µP in a
known state. The MAX6340/MAX6421–MAX6426 µP
supervisory circuits provide the reset logic to prevent
code-execution errors during power-up, power-down,
and brownout conditions (see Typical Operating
Characteristics).
RESET changes from high to low whenever V
below the threshold voltage. Once V
threshold voltage, RESET remains low for the capacitor-
adjustable reset timeout period.
The MAX6422 active-high RESET output is the inverse
logic of the active-low RESET output. All device outputs
are guaranteed valid for V
The MAX6340/MAX6423/MAX6425/MAX6426 are open-
drain RESET outputs. Connect an external pullup resis-
tor to any supply from 0 to 5.5V. Select a resistor value
large enough to register a logic low when RESET is
asserted and small enough to register a logic high
while supplying all input current and leakage paths
connected to the RESET line. A 10kΩ to 100kΩ pullup
is sufficient in most applications.
4
MAX6340
SOT23
_______________________________________________________________________________________
—
1
2
3
4
5
SOT143
—
3
1
2
4
MAX6421
MAX6422
MAX6423
Detailed Description
SC70
PIN
—
3
2
1
4
CC
> 1V.
MAX6424
MAX6425
SOT23
—
5
3
4
2
1
Reset Output
CC
MAX6426
exceeds the
SOT23
2, 3
—
—
1
5
4
CC
drops
RESET
RESET
NAME
GND
N.C.
SRT
V
CC
The reset timeout period is adjustable to accommodate
a variety of µP applications. Adjust the reset timeout
period (t
SRT and ground. Calculate the reset timeout capacitor
as follows:
Figure 1. MAX6340/MAX6423/MAX6425/MAX6426 Open-Drain
RESET Output Allows Use with Multiple Supplies
Set Reset Timeout Input. Connect a capacitor between SRT
and ground to set the timeout period. Determine the period as
follows: t
and C
Ground
Not Internally Connected. Can be connected to GND.
Supply Voltage and Reset Threshold Monitor Input
RESET changes from high to low whenever V
the selected reset threshold voltage. RESET remains low for
the reset timeout period after V
threshold.
RESET changes from low to high whenever V
the selected reset threshold voltage. RESET remains high for
the reset timeout period after V
threshold.
C
SRT
SRT
SRT
RP
RP
in farads.
= 2.73
) by connecting a capacitor (C
TIMEOUT
RESET
✕
10
Selecting a Reset Capacitor
6
✕
LASER-TRIMMED
MAX6340
MAX6423
MAX6425
MAX6426
FUNCTION
V
RESISTORS
C
REF
SRT
CC
CC
+ 275µs with t
V
exceeds the reset
exceeds the reset
CC
Pin Description
3.3V
RESET
GND
N
CC
CC
RP
10kΩ
SRT
drops below
drops below
in seconds
) between
SYSTEM
5.0V
5V