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MAX6747 Datasheet

  • MAX6747

  • ?P Reset Circuits with Capacitor-Adjustable Reset/Watchdog T...

  • Maxim   Maxim

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19-2530; Rev 1; 1/03
碌P Reset Circuits with Capacitor-Adjustable
Reset/Watchdog Timeout Delay
General Description
The MAX6746鈥揗AX6753 low-power microprocessor
(碌P) supervisory circuits monitor single/dual system
supply voltages from 1.575V to 5V and provide maxi-
mum adjustability for reset and watchdog functions.
These devices assert a reset signal whenever the V
CC
supply voltage or RESET IN falls below its reset thresh-
old or when manual reset is pulled low. The reset output
remains asserted for the reset timeout period after V
CC
and RESET IN rise above the reset threshold. The reset
function features immunity to power-supply transients.
The MAX6746鈥揗AX6753 have 鹵2% factory-trimmed
reset threshold voltages in approximately 100mV incre-
ments from 1.575V to 5.0V and/or adjustable reset
threshold voltages using external resistors.
The reset and watchdog delays are adjustable with
external capacitors. The MAX6746鈥揗AX6751 contain a
watchdog select input that extends the watchdog time-
out period by 128x. The MAX6752/MAX6753 contain a
window watchdog timer that looks for activity outside an
expected window of operation.
The MAX6746鈥揗AX6753 are available with a push-pull
or open-drain active-low
RESET
output. The MAX6746鈥?/div>
MAX6753 are available in an 8-pin SOT23 package and
are fully specified over the automotive temperature
range (-40擄C to +125擄C).
Features
o
Factory-Set Reset Threshold Options from 1.575V
to 5V in ~100mV Increments
o
Adjustable Reset Threshold Options
o
Single/Dual Voltage Monitoring
o
Capacitor-Adjustable Reset Timeout
o
Capacitor-Adjustable Watchdog Timeout
o
Min/Max (Windowed) Watchdog Option
o
Manual Reset Input Option
o
Guaranteed
RESET
Valid for V
CC
鈮?/div>
1V
o
3.7碌A(chǔ) Supply Current
o
Push-Pull or Open-Drain
RESET
Output Options
o
Power-Supply Transient Immunity
o
Small 8-Pin SOT23 Packages
MAX6746鈥揗AX6753
Ordering Information
PART
MAX6746KA_
_-T
MAX6747KA_
_-T
MAX6748KA-T
MAX6749KA-T
MAX6750KA_
_-T
MAX6751KA_
_-T
MAX6752KA_
_-T
MAX6753KA_
_-T
TEMP RANGE
-40擄C to +125擄C
-40擄C to +125擄C
-40擄C to +125擄C
-40擄C to +125擄C
-40擄C to +125擄C
-40擄C to +125擄C
-40擄C to +125擄C
-40擄C to +125擄C
PIN-PACKAGE
8 SOT23-8
8 SOT23-8
8 SOT23-8
8 SOT23-8
8 SOT23-8
8 SOT23-8
8 SOT23-8
8 SOT23-8
Applications
Medical Equipment
Automotive
Intelligent Instruments
Portable Equipment
Battery-Powered
Computers/Controllers
Embedded Controllers
Critical 碌P Monitoring
Set-Top Boxes
Computers
Pin Configurations
TOP VIEW
RESET IN (MR) 1
SWT 2
SRT
3
8
7
V
CC
RESET
WDI
WDS
Note:
鈥淿 _鈥?represents the two number suffix needed when
ordering the reset threshold voltage value for the
MAX6746/MAX6747 and MAX6750鈥揗AX6753. The reset
threshold voltages are available in approximately 100mV incre-
ments. Table 2 contains the suffix and reset factory-trimmed
voltages. All devices are available in tape-and-reel only. There
is a 2500-piece minimum order increment for standard ver-
sions (see Table 3). Sample stock is typically held on standard
versions only. Nonstandard versions require a minimum order
increment of 10,000 pieces. Contact factory for availability.
MAX6746鈥?/div>
MAX6751
6
5
GND 4
Selector Guide appears at end of data sheet.
Typical Operating Circuit appears at end of data sheet.
SOT23-8
( ) ARE FOR MAX6746 AND MAX6747 ONLY.
Pin Configurations continued 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.

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