MAX6746 datasheet(2/14 Pages) MAXIM

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µP Reset Circuits with Capacitor-Adjustable

Reset/Watchdog Timeout Delay

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ABSOLUTE MAXIMUM RATINGS

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)

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.

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

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

TA = 0°C to +125°C

1.0

5.5

Supply Voltage

VCC

TA = -40°C to 0°C

1.2

5.5

VCC

≤ 5.5V

VCC

≤ 3.3V

4.2

Supply Current

ICC

VCC

≤ 2.0V

3.7

µA

VCC Reset Threshold

VTH

See VTH

selection table

TA = -40°C to+125°C

VTH -

VTH +

Hysteresis

VHYST

0.8

VCC to Reset Delay

VCC falling from VTH + 100mV to VTH -

100mV at 1mV/µs

µs

CSRT = 1500pF

5.692

7.590

9.487

Reset Timeout Period

tRP

CSRT = 100pF

0.506

SRT Ramp Current

IRAMP

VSRT = 0 to 1.23V; VCC = 1.6V to 5V

200

250

300

SRT Ramp Threshold

VRAMP

VCC = 1.6V to 5V (VRAMP rising)

1.173

1.235

1.297

CSWT = 1500pF

5.692

7.590

9.487

Normal Watchdog Timeout Period

(MAX6746–MAX6751)

tWD

CSWT = 100pF

0.506

CSWT = 1500pF

728.6

971.5

1214.4

Extended Watchdog Timeout

(MAX6746–MAX6751)

tWD

CSWT = 100pF

64.77

CSWT = 1500pF

728.6

971.5

1214.4

Slow Watchdog Period

(MAX6752/MAX6753)

tWD2

CSWT = 100pF

64.77

CSWT = 1500pF

91.08

121.43

151.80

Fast Watchdog Timeout Period,

SET Ratio = 8,

(MAX6752/MAX6753)

tWD1

CSWT = 100pF

8.09

CSWT = 1500pF

45.53

60.71

75.89

Fast Watchdog Timeout Period,

SET Ratio = 16,

(MAX6752/MAX6753)

tWD1

CSWT = 100pF

4.05

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