Datasheet
V
CC
to GND...........................................................-0.3V to +6.0V
SRT, SWT, SET0, SET1, RESET IN, WDS, MR,
WDI, to GND......................................…-0.3V to (V
CC
+ 0.3V)
RESET (Push-Pull) to GND....................…-0.3V to (V
CC
+ 0.3V)
RESET (Open Drain) to GND.............................…-0.3V to +6.0V
Input Current (All Pins).....................................................±20mA
Output Current (RESET) ...................................................±20mA
Continuous Power Dissipation (T
A
= +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
(V
CC
= +1.2V to +5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise specified. Typical values are at V
CC
= +5V and T
A
= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage V
CC
T
A
= 0°C to +125°C 1.0 5.5
V
T
A
= -40°C to 0°C 1.2 5.5
Supply Current I
CC
V
CC
≤ 5.5V 5 10
µAV
CC
≤ 3.3V 4.2 9
V
CC
≤ 2.0V 3.7 8
V
CC
Reset Threshold V
TH
See V
TH
selection table
T
A
= -40°C to +125°C
V
TH
-
2%
V
TH
+
2%
V
Hysteresis V
HYST
0.8 %
V
CC
to Reset Delay
V
CC
falling from V
TH
+ 100mV to V
TH
-100mV at 1mV/µs
20 µs
Reset Timeout Period t
RP
C
SRT
= 1500pF 5.692 7.590 9.487
ms
C
SRT
= 100pF 0.506
SRT
Ramp Current I
RAMP
V
SRT
= 0 to 1.23V; V
CC
= 1.6V to 5V 200 250 300 nA
SRT
Ramp Threshold V
RAMP
V
CC
= 1.6V to 5V (V
RAMP
rising) 1.173 1.235 1.297 V
Normal Watchdog Timeout Period
(MAX6746–MAX6751)
t
WD
C
SWT
= 1500pF 5.692 7.590 9.487
ms
C
SWT
= 100pF 0.506
Extended Watchdog Timeout
(MAX6746–MAX6751)
t
WD
C
SWT
= 1500pF 728.6 971.5 1214.4
ms
C
SWT
= 100pF 64.77
Slow Watchdog Period
(MAX6752/MAX6753)
t
WD2
C
SWT
= 1500pF 728.6 971.5 1214.4
ms
C
SWT
= 100pF 64.77
Fast Watchdog Timeout Period,
SET Ratio = 8,
(MAX6752/MAX6753)
t
WD1
C
SWT
= 1500pF 91.08 121.43 151.80
ms
C
SWT
= 100pF 8.09
Fast Watchdog Timeout Period,
SET Ratio = 16,
(MAX6752/MAX6753)
t
WD1
C
SWT
= 1500pF 45.53 60.71 75.89
ms
C
SWT
= 100pF 4.05
MAX6746–MAX6753 μP Reset Circuits with Capacitor-Adjustable
Reset/Watchdog Timeout Delay
www.maximintegrated.com
Maxim Integrated
│
2
Absolute Maximum Ratings
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