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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6747 Datasheet

uP Reset Circuits

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MAX6747 pdf
MAX6746–MAX6753
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 maximum
adjustability for reset and watchdog functions. These
devices assert a reset signal whenever the VCC
supply voltage or RESET IN falls below its reset threshold
or when manual reset is pulled low. The reset output
remains asserted for the reset timeout period after VCC
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
increments 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
timeout 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
Benefits and Features
Configurable Reset and Watchdog Options Enables
Wide Variety of Applications
Factory-Set Reset Threshold Options from 1.575V
to 5V in ~100mV Increments
Adjustable Reset Threshold Options
Single/Dual Voltage Monitoring
Capacitor-Adjustable Reset Timeout
Capacitor-Adjustable Watchdog Timeout
Min/Max (Windowed) Watchdog Option
Manual-Reset Input Option
Push-Pull or Open-Drain RESET Output Options
3.7μA Supply Current Reduces System Power
Consumption
Integrated Power Supply Protection Increases
Robustness
Power-Supply Transient Immunity
Guaranteed RESET Valid for VCC ≥ 1V
8-Pin SOT23 Packages Saves Board Space
Selector Guide and Ordering Information appear at end of
data sheet.
Typical Operating Circuit
VIN
VCC
R1
RESET IN
VCC
MAX6748
MAX6749
R2 MAX6750
MAX6751
GND RESET
MAX6749
MAX4751
µP
RESET
CSRT
CSWT
SRT
SWT
WDI I/O
WDS
WDS = 0 FOR NORMAL MODE
WDS = VCC FOR EXTENDED MODE
19-2530; Rev 15; 1/17


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6747 Datasheet

uP Reset Circuits

No Preview Available !

MAX6747 pdf
MAX6746–MAX6753
μP Reset Circuits with Capacitor-Adjustable
Reset/Watchdog Timeout Delay
Absolute Maximum Ratings
VCC to GND...........................................................-0.3V to +6.0V
SRT, SWT, SET0, SET1, RESET IN, WDS, MR,
WDI, to GND......................................…-0.3V to (VCC + 0.3V)
RESET (Push-Pull) to GND....................…-0.3V to (VCC + 0.3V)
RESET (Open-Drain) to GND.............................…-0.3V to +6.0V
Input Current (All Pins).....................................................±20mA
Output Current (RESET) ...................................................±20mA
Continuous Power Dissipation (TA = +70°C)
8-Pin SOT23 (derate 8.9mW/°C above +70°C)...........714mW
Operating Temperature Range .........................-40°C to +125°C
Storage Temperature Range ............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Electrical Characteristics
(VCC = +1.2V to +5.5V, TA = TMIN to TMAX, unless otherwise specified. Typical values are at VCC = +5V and TA = +25°C.) (Note 1)
PARAMETER
Supply Voltage
Supply Current
VCC Reset Threshold
Hysteresis
VCC Reset Threshold
(MAX6752AKA32 Only)
Hysteresis
(MAX6752AKA32 Only)
VCC to Reset Delay
Reset Timeout Period
SRT Ramp Current
SRT Ramp Threshold
Normal Watchdog Timeout Period
(MAX6746–MAX6751)
Extended Watchdog Timeout
(MAX6746–MAX6751)
Slow Watchdog Period
(MAX6752/MAX6753)
Fast Watchdog Timeout Period,
SET Ratio = 8,
(MAX6752/MAX6753)
Fast Watchdog Timeout Period,
SET Ratio = 16,
(MAX6752/MAX6753)
SYMBOL
VCC
ICC
VTH
CONDITIONS
TA = 0°C to +125°C
TA = -40°C to 0°C
VCC ≤ 5.5V
VCC ≤ 3.3V
VCC ≤ 2.0V
See VTH
selection table
TA = -40°C to +125°C
VHYST
TA = -40°C to +125°C
VHYST
tRP
IRAMP
VRAMP
tWD
tWD
tWD2
tWD1
tWD1
VCC falling from VTH + 100mV to VTH
-100mV at 1mV/µs
CSRT = 1500pF
CSRT = 100pF
VSRT = 0 to 1.23V; VCC = 1.6V to 5V
VCC = 1.6V to 5V (VRAMP rising)
CSWT = 1500pF
CSWT = 100pF
CSWT = 1500pF
CSWT = 100pF
CSWT = 1500pF
CSWT = 100pF
CSWT = 1500pF
CSWT = 100pF
CSWT = 1500pF
CSWT = 100pF
MIN
1.0
1.2
VTH -
2%
TYP
5
4.2
3.7
0.8
MAX
5.5
5.5
10
9
8
VTH +
2%
UNITS
V
µA
V
%
3.136
3.224
V
0.65 0.80 0.90
%
20
5.692
200
1.173
5.692
728.6
728.6
91.08
7.590 9.487
0.506
250 300
1.235 1.297
7.590 9.487
0.506
971.5 1214.4
64.77
971.5 1214.4
64.77
121.43 151.80
8.09
45.53 60.71 75.89
4.05
µs
ms
nA
V
ms
ms
ms
ms
ms
www.maximintegrated.com
Maxim Integrated │2


Part Number MAX6747
Description uP Reset Circuits
Maker Maxim
Total Page 15 Pages
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MAX6747 pdf
MAX6747 Datasheet PDF
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