MAX6728A(2019) 데이터 시트보기 (PDF) - Maxim Integrated
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MAX6728A Datasheet PDF : 19 Pages
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MAX6715A–MAX6729A/
MAX6797A
Dual/Triple, Ultra-Low-Voltage, SOT23 μP
Supervisory Circuits
General Description
The MAX6715A–MAX6729A/MAX6797A are ultra-low-
voltage microprocessor (μP) supervisory circuits designed to
monitor two or three system power-supply voltages. These
devices assert a system reset if any monitored supply falls
below its factory-trimmed or adjustable threshold and main-
tain reset for a minimum timeout period after all supplies rise
above their thresholds. The integrated dual/triple superviso-
ry circuits significantly improve system reliability and reduce
size compared to separate ICs or discrete components.
These devices monitor primary supply voltages (VCC1)
from 1.8V to 5.0V and secondary supply voltages (VCC2)
from 0.9V to 3.3V with factory-trimmed reset threshold
voltage options (see the Reset Voltage Threshold Suffix
Guide). An externally adjustable RSTIN input option
allows customers to monitor a third supply voltage down
to 0.62V. These devices are guaranteed to be in the cor-
rect reset output logic state when either VCC1 or VCC2
remains greater than 0.8V.
A variety of push-pull or open-drain reset outputs along
with watchdog input, manual-reset input, and power-fail
input/output features are available (see the Selector
Guide). Select reset timeout periods from 1.1ms to
1120ms (min) (see the Reset Timeout Period Suffix
Guide). The MAX6715A–MAX6729A/MAX6797A are
available in small 5-, 6-, and 8-pin SOT23 packages and
operate over the -40°C to +125°C temperature range.
Applications
●● Multivoltage Systems
●● Telecom/Networking
Equipment
●● Computers/Servers
●● Portable/Battery-
Operated Equipment
●● Industrial Equipment
●● Printers/Fax Machines
●● Set-Top Boxes
Features
●● VCC1 (Primary Supply) Reset Threshold Voltages
from 1.58V to 4.63V
●● VCC2 (Secondary Supply) Reset Threshold Voltages
from 0.79V to 3.08V
●● Externally Adjustable RSTIN Threshold for Auxiliary/
Triple-Voltage Monitoring (0.62V Internal Reference)
●● Watchdog Timer Option
• 35s (min) Long Startup Period
• 1.12s (min) Normal Timeout Period
●● Manual-Reset Input Option
●● Power-Fail Input/Power-Fail Output Option
(Push-Pull and Open-Drain Active-Low)
●● Guaranteed Reset Valid Down to VCC1 or
VCC2 = 0.8V
●● Reset Output Logic Options
●● Immune to Short VCC Transients
●● Low Supply Current 14μA (typ) at 3.6V
●● Watchdog Disable Feature
●● Small 5, 6, and 8-Pin SOT23 Packages
●● AEC-Q100 Qualified: MAX6719AUTTWD1/V+T
Ordering Information continued at end of data sheet.
Pin Description and Selector Guide appear at end of data
sheet.
Typical Operating Circuit
UNREGULATED
DC
R1
R2
DC-DC OUT2
IN CONVERTER
OUT1
PUSHBUTTON
SWITCH
VCC1
VCC2
MAX6715A-
MAX6729A/
MAX6797A
RST
RSTIN/PFI
WDI
MR
PFO
MAX67_ _
1.8V 0.9V
I/O CORE
SUPPLY SUPPLY
RESET
I/O µP
NMI
19-0536; Rev 6; 7/19
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