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MAX6728KAZGD4+T

Description
Monitoring circuit
Categorysemiconductor    Power management IC    Monitoring circuit   
File Size733KB,20 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
Download Datasheet Parametric View All

MAX6728KAZGD4+T Overview

Monitoring circuit

MAX6728KAZGD4+T Parametric

Parameter NameAttribute value
MakerMaxim
Product CategoryMonitoring circuit
typeVoltage Supervisory
Installation styleSMD/SMT
Package/boxSOT-23-8
threshold voltage1.8 V to 5 V, 0.9 V to 3.3 V
Number of monitored inputs3 Input
Output typeActive Low, Open Drain
manual resetManual Reset
watchdog timerWatchdog
Battery backup switchNo Backup
Reset delay time1680 ms
Supply voltage - max.5.5 V
Minimum operating temperature- 40 C
Maximum operating temperature+ 85 C
seriesMAX6728
EncapsulationReel
high1.1 mm
length2.9 mm
width1.63 mm
Overvoltage threshold2.375 V, 1.14 V, Adjustable
Undervoltage threshold2.25 V, 1.08 V, Adjustable
Chip enable signalNo Chip Enable
Working power current15 uA
Pd-power dissipation714 mW
Power failure detectionYes
Supply voltage - min.0.8 V
unit weight40 mg
19-2325; Rev 5; 12/05
Dual/Triple Ultra-Low-Voltage SOT23 µP
Supervisory Circuits
General Description
The MAX6715–MAX6729 are ultra-low-voltage microproces-
sor (µP) supervisory circuits designed to monitor two or three
system power-supply voltages. These devices assert a sys-
tem reset if any monitored supply falls below its factory-
trimmed or adjustable threshold and maintain reset for a
minimum timeout period after all supplies rise above their
thresholds. The integrated dual/triple supervisory circuits sig-
nificantly improve system reliability and reduce size com-
pared to separate ICs or discrete components.
These devices monitor primary supply voltages (V
CC
1) from
1.8V to 5.0V and secondary supply voltages (V
CC
2) from
0.9V to 3.3V with factory-trimmed reset threshold voltage
options (see
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 correct reset output logic state
when either V
CC
1 or V
CC
2 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/out-
put features are available (see
Selector Guide).
Select reset
timeout periods from 1.1ms to 1120ms (min) (see
Reset
Timeout Period Suffix Guide).
The MAX6715–MAX6729 are
available in small 5, 6, and 8-pin SOT23 packages and oper-
ate over the -40°C to +85°C temperature range.
Features
V
CC
1 (primary supply) Reset Threshold Voltages
from 1.58V to 4.63V
V
CC
2 (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 V
CC
1 or
V
CC
2 = 0.8V
Reset Output Logic Options
Immune to Short V
CC
Transients
Low Supply Current 14µA (typ) at 3.6V
Small 5, 6, and 8-Pin SOT23 Packages
MAX6715–MAX6729
Applications
Multivoltage Systems
Telecom/Networking Equipment
Computers/Servers
Portable/Battery-Operated Equipment
Industrial Equipment
Printer/Fax
Set-Top Boxes
PART
MAX6715UT_
_D_ -T
MAX6716UT_
_D_ -T
MAX6717UK_
_D_ -T
MAX6718UK_
_D_ -T
MAX6719UT_
_D_ -T
MAX6720UT_
_D_ -T
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
6 SOT23-6
6 SOT23-6
5 SOT23-5
5 SOT23-5
6 SOT23-6
6 SOT23-6
Typical Operating Circuit
OUT2
DC/DC
CONVERTER
OUT1
V
CC
1
R1
RST
RSTIN/PFI
MR
R2
PUSHBUTTON
SWITCH
MAX67_ _
WDI
PFO
RESET
I/O
NMI
µP
V
CC
2
UNREGULATED
DC
IN
1.8V
0.9V
I/O
CORE
SUPPLY SUPPLY
Note:
The first “_ _” are placeholders for the threshold voltage
levels of the devices. Desired threshold levels are set by the part
number suffix found in the Reset Voltage Threshold Suffix Guide.
The “_” after the D is a placeholder for the reset timeout delay
time. Desired delay time is set using the timeout period suffix
found in the Reset Timeout Period Suffix Guide. For example the
MAX6716UTLTD3-T is a dual-voltage supervisor V
TH
1 = 4.625V,
V
TH
2 = 3.075V, and 210ms (typ) timeout period.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing "-T" with "+T" when ordering.
Ordering Information continued at end of data sheet.
Pin Configurations and Selector Guide appear at end of
data sheet.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
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