MAX6746 Maxim, MAX6746 Datasheet
MAX6746
Manufacturer Part Number
MAX6746
Description
UP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay
Manufacturer
Maxim
Datasheet
1.MAX6746.pdf
(14 pages)
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The MAX6746–MAX6753 low-power microprocessor
(µP) 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
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
and RESET IN rise above the reset threshold. The reset
function features immunity to power-supply transients.
The MAX6746–MAX6753 have ±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–MAX6751 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–MAX6753 are available with a push-pull
or open-drain active-low RESET output. The MAX6746–
MAX6753 are available in an 8-pin SOT23 package and
are fully specified over the automotive temperature
range (-40°C to +125°C).
19-2530; Rev 2; 8/03
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.
Pin Configurations continued at end of data sheet.
Medical Equipment
Automotive
Intelligent Instruments
Portable Equipment
Battery-Powered
Computers/Controllers
TOP VIEW
( ) ARE FOR MAX6746 AND MAX6747 ONLY.
µP Reset Circuits with Capacitor-Adjustable
RESET IN (MR)
SWT
GND
SRT
________________________________________________________________ Maxim Integrated Products
1
2
4
3
General Description
MAX6746–
Pin Configurations
SOT23-8
MAX6751
Embedded Controllers
Critical µP Monitoring
Set-Top Boxes
Computers
Applications
6
8
7
5
V
RESET
WDI
WDS
Reset/Watchdog Timeout Delay
CC
CC
CC
o Factory-Set Reset Threshold Options from 1.575V
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
o 3.7µA Supply Current
o Push-Pull or Open-Drain RESET Output Options
o Power-Supply Transient Immunity
o Small 8-Pin SOT23 Packages
Selector Guide appears at end of data sheet.
Typical Operating Circuit appears at end of data sheet.
Note: “_ _” represents the two number suffix needed when
ordering the reset threshold voltage value for the
MAX6746/MAX6747 and MAX6750–MAX6753. 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.
MAX6746KA_ _-T
MAX6747KA_ _-T
MAX6748KA-T
MAX6749KA-T
MAX6750KA_ _-T
MAX6751KA_ _-T
MAX6752KA_ _-T
MAX6753KA_ _-T
to 5V in ~100mV Increments
PART
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
Ordering Information
TEMP RANGE
CC
≥ 1V
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
Features
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