MAX6753KA29-T Datasheet, PDF (1/14 Pages) Maxim Integrated Products – μP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay

19-2530; Rev 6; 4/11
µP Reset Circuits with Capacitor-Adjustable
Reset/Watchdog Timeout Delay
General Description
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_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–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).
Applications
Medical Equipment
Automotive
Intelligent Instruments
Portable Equipment
Battery-Powered
Computers/Controllers
Embedded Controllers
Critical µP Monitoring
Set-Top Boxes
Computers
Pin Configurations
TOP VIEW
RESET IN (MR) 1
SWT 2
SRT 3
GND 4
MAX6746–
MAX6751
8 V_CC
7 RESET
6 WDI
5 WDS
SOT23-8
( ) ARE FOR MAX6746 AND MAX6747 ONLY.
Pin Configurations continued at end of data sheet.
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 ≥ 1V
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
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX6746KA_ _-T -40°C to +125°C 8 SOT23
MAX6746KA_ _/V+T -40°C to +125°C 8 SOT23
MAX6747KA_ _-T -40°C to +125°C 8 SOT23
MAX6747KA_ _/V+T -40°C to +125°C 8 SOT23
MAX6748KA-T
-40°C to +125°C 8 SOT23
MAX6749KA-T
-40°C to +125°C 8 SOT23
MAX6750KA_ _-T -40°C to +125°C 8 SOT23
MAX6750KA_ _/V+T -40°C to +125°C 8 SOT23
MAX6751KA_ _-T -40°C to +125°C 8 SOT23
MAX6752KA_ _-T -40°C to +125°C 8 SOT23
MAX6753KA_ _-T -40°C to +125°C 8 SOT23
MAX6753KA_ _/V+T -40°C to +125°C 8 SOT23
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.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
/V Denotes an automotive qualified part.
Selector Guide appears at end of data sheet.
Typical Operating Circuit appears at end of data sheet.
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