MAX6457UKD0A+T Maxim Integrated Products, MAX6457UKD0A+T Datasheet - Page 13

• Manufacturer Part Number: MAX6457UKD0A+T
• Description: IC SUPPLY VOLT MONITR SOT23-5
• Manufacturer: Maxim Integrated Products
• Type: Simple Reset/Power-On Resetr

Specifications of MAX6457UKD0A+T

• Number Of Voltages Monitored: 1
• Output: Open Drain or Open Collector
• Reset: Active Low
• Reset Timeout: 50 µs Typical
• Voltage - Threshold: Adjustable/Selectable
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-5, SC-74A, SOT-25
• Undervoltage Threshold: 1.155 V
• Overvoltage Threshold: 1.255 V
• Supply Voltage (max): 28 V
• Supply Voltage (min): 4 V
• Supply Current (typ): 6.5 uA (Typ)
• Operating Temperature Range: + 125 C
• Mounting Style: SMD/SMT
• Manual Reset: Not Resettable
• Watchdog: No Watchdog
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MAX6457UKD0A+T; MAX6457UKD0A+TTR

4) Calculate R1
The MAX6457–MAX6460 can monitor voltages other than
V
Programming the Trip Voltage (V
tored voltage (V
be within the specified operating range: 0 to V
CC
High-Voltage, Low-Current Voltage Monitors in
(Figure 12). Calculate V
R
2
R
=
=
1
Monitoring Voltages Other than V
=
=
( .
36 06
=
=
V
1 167
TH
.
R
4 2
3 94067
V
-
.
.
TRIPLOW
TOTAL
MON
×
18 9
k
M
______________________________________________________________________________________
V
Ω
R
) ( .
Ω
.
) is independent of V
TOTAL
4 2
V
-
M
-
TOP VIEW
223 273
R
Ω
M
2
Ω
.
-
)
-
R
R
-
OUTA
3
3
GND
GND
223 273
OUT
k
IN+
IN+
TRIP
Ω
TRIP
.
-
1
2
3
1
2
3
) section. The moni-
36 06
as shown in the
k
.
MAX6457
MAX6459
SOT23
SOT23
Ω
CC
k
Ω
CC
. V
.
IN
+ must
5
4
6
5
4
CC
V
CLEAR
V
OUTB
IN-
CC
CC
The open-drain outputs of the MAX6457–MAX6460
allow the output voltage to be selected independent of
V
V
OUTB and any desired voltage up to 28V (see Figure 13).
Figure 14 shows the typical application circuit for moni-
toring negative voltages (V
Select a value for R1 between 25kΩ and 1MΩ. Use the
following equation to select R2:
where V
be within the specified operating range: 0 to V
CC
CC
GND
GND
OUT
OUT
. For systems requiring an output voltage other than
, connect the pullup resistor between OUT, OUTA, or
IN+
IN+
Interfacing to Voltages Other than V
1
2
3
1
2
3
REF
MAX6458
MAX6460
SOT23
SOT23
= 2.25V and V
R
Monitoring Negative Voltages
2
=
SOT Packages
5
4
6
5
4
R
1
V
IN-
V
REF
IN-
CC
CC
×
Pin Configurations
NEG
NEG
-
V
V
REF
NEG
< 0. V
) using the MAX6460.
IN
+ must always
CC
.
CC
13