MAX6746 查看數據表（PDF） - Maxim Integrated
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MAX6746 Datasheet PDF : 14 Pages
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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
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
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
MIN
1.0
1.2
VTH -
2%
TYP MAX UNITS
5.5
V
5.5
5
10
4.2
9
µA
3.7
8
VTH +
2%
V
Hysteresis
VCC to Reset Delay
VHYST
VCC falling from VTH + 100mV to VTH -
100mV at 1mV/µs
0.8
%
20
µs
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)
tRP
IRAMP
VRAMP
tWD
tWD
tWD2
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
5.692 7.590 9.487
ms
0.506
200
250
300
nA
1.173 1.235 1.297
V
5.692 7.590 9.487
ms
0.506
728.6 971.5 1214.4
ms
64.77
728.6 971.5 1214.4
ms
64.77
Fast Watchdog Timeout Period,
SET Ratio = 8,
(MAX6752/MAX6753)
tWD1
CSWT = 1500pF
CSWT = 100pF
91.08 121.43 151.80
ms
8.09
Fast Watchdog Timeout Period,
SET Ratio = 16,
(MAX6752/MAX6753)
tWD1
CSWT = 1500pF
CSWT = 100pF
45.53 60.71 75.89
ms
4.05
2 _______________________________________________________________________________________
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