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MAX6728KAVFD6-T Datasheet

  • MAX6728KAVFD6-T

  • Analog IC

  • 314.11KB

  • 19页

  • MAXIM   MAXIM

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19-2325; Rev 0; 1/02
Dual/Triple Ultra-Low-Voltage SOT23 碌P
Supervisory Circuits
General Description
The MAX6715鈥揗AX6729 are ultra-low-voltage microproces-
sor (碌P) 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鈥揗AX6729 are
available in small 5, 6, and 8-pin SOT23 packages and oper-
ate over the -40掳C to +85掳C temperature range.
Features
o
V
CC
1 (primary supply) Reset Threshold Voltages
from 1.58V to 4.63V
o
V
CC
2 (secondary supply) Reset Threshold
Voltages from 0.79V to 3.08V
o
Externally Adjustable RSTIN Threshold for
Auxiliary/Triple-Voltage Monitoring
(0.62V internal reference)
o
Watchdog Timer Option
35s (min) Long Startup Period
1.12s (min) Normal Timeout Period
o
Manual Reset Input Option
o
Power-Fail Input/Power-Fail Output Option
(Push-Pull and Open-Drain Active-Low)
o
Guaranteed Reset Valid Down to V
CC
1 or
V
CC
2 = 0.8V
o
Reset Output Logic Options
o
Immune to Short V
CC
Transients
o
Low Supply Current 14碌A (typ) at 3.6V
o
Small 5, 6, and 8-Pin SOT23 Packages
MAX6715鈥揗AX6729
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掳C to +85掳C
-40掳C to +85掳C
-40掳C to +85掳C
-40掳C to +85掳C
-40掳C to +85掳C
-40掳C to +85掳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
碌P
V
CC
2
UNREGULATED
DC
IN
1.8V
0.9V
I/O
CORE
SUPPLY SUPPLY
Note:
The first 鈥淿 _鈥?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 鈥淿鈥?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.
Ordering Information continued at end of data sheet.
Pin Configurations appear at end of data sheet.
Selector Guide appears 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鈥檚 website at www.maxim-ic.com.

MAX6728KAVFD6-T 产品属性

  • Maxim Integrated Products

  • 3

  • 1.8 V to 5 V, 0.9 V to 3.3 V

  • 1.53 V, 1.02 V, Adjustable

  • 1.62 V, 1.08 V, Adjustable

  • Active Low, Open Drain

  • Resettable

  • Watchdog

  • No Backup

  • 840 ms

  • 5.5 V

  • 0.8 V

  • 15 uA

  • 714 mW

  • + 85 C

  • SMD/SMT

  • SOT-23

  • Reel

  • - 40 C

  • Yes

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