MAX802_CSLASHD datasheet(4/13 Pages) MAXIM

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(VCC = 3.17V to 5.5V for the MAX690T/MAX704T/MAX80_T, VCC = 3.02V to 5.5V for the MAX690S/MAX704S/MAX80_S, VCC = 2.72V to

5.5V for the MAX690R/MAX704R/MAX80_R; VBATT = 3.6V; TA = TMIN to TMAX; unless otherwise noted. Typical values are at TA = +25C.)

Note 1: VCC supply current, logic input leakage, watchdog functionality (MAX690_/802_/805_/804_), MR functionality

(MAX704_/806_), PFI functionality, state of RESET (MAX690_/704_/802_/806_), and RESET (MAX804_/805_) tested at

VBATT = 3.6V, and VCC = 5.5V. The state of RESET or RESET and PFO is tested at VCC = VCC min.

Note 2: Tested at VBATT = 3.6V, VCC = 3.5V and 0V. The battery current will rise to 10µA over a narrow transition window around

VCC = 1.9V.

Note 3: Leakage current into the battery is tested under the worst-case conditions at VCC = 5.5V, VBATT = 1.8V and at VCC = 1.5V,

VBATT= 1.0V.

Note 4: Guaranteed by design.

Note 5: When VSW > VCC > VBATT, VOUT remains connected to VCC until VCC drops below VBATT. The VCC-to-VBATT compara-

tor has a small 25mV typical hysteresis to prevent oscillation. For VCC < 1.75V (typ), VOUT switches to VBATT regardless

of the voltage on VBATT.

Note 6: When VBATT > VCC > VSW, VOUT remains connected to VCC until VCC drops below the battery switch threshold (VSW).

Note 7: VOUT switches from VBATT to VCC when VCC rises above the reset threshold, independent of VBATT. Switchover back to

VCC occurs at the exact voltage that causes RESET to go high (on the MAX804_/805_, RESET goes low); however

switchover occurs 200ms prior to reset.

Note 8: The reset threshold tolerance is wider for VCC rising than for VCC falling to accommodate the 10mV typical hysteresis,

which prevents internal oscillation.

Note 9: The leakage current into or out of the RESET pin is tested with RESET asserted (RESET output high impedance).

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

PFI Input Threshold

VPFT

VCC < 3.6V

VPFI falling

MAX802_C/E, MAX804_C/E,

MAX806_C/E

1.212

1.237

1.262

MAX690_/MAX704_/MAX805_

1.187

1.237

1.287

PFI Input Current

MAX690_C/E, MAX704_C/E, MAX80_ _C/E

-25

MAX690_M, MAX704_M, MAX80_ _M

-500

500

PFI Hysteresis, PFI Rising

VPFH

VCC < 3.6V

MAX690_C/E, MAX704_C/E,

MAX80_ _C/E

MAX690_M, MAX704_M,

MAX80_ _M

PFI Input Current

MAX690_C/E, MAX704_C/E, MAX80_ _C/E

-25

MAX690_M, MAX704_M, MAX80_ _M

-500

500

MR Input Threshold

VIH

MAX704_/MAX806_ only

0.7 x VCC

VIL

0.3 x VCC

MR Pulse Width

tMR

MAX704_/MAX806_ only

100

MR to Reset Delay

tMD

MAX704_/MAX806_ only

500

MR Pull-Up Current

MAX704_/MAX806_ only, MR = 0V, VCC = 3V

350

µA

WDI Input Threshold

VIH

MAX690_/MAX802_/MAX804_/MAX805_ only

0.7 x VCC

VIL

0.3 x VCC

WDI Input Current

0V< VCC <

5.5V

MAX690_C/E, MAX802_C/E,

MAX804_C/E, MAX805_C/E

-1

+0.01

µA

MAX690_M, MAX802_M,

MAX804_M, MAX805_M

-10

+0.01

+10

Watchdog Timeout Period

tWD

VCC < 3.6V

MAX690/MAX802/MAX804/

MAX805 only

1.12

1.60

2.24

WDI Pulse Width

MAX690_/MAX802_/MAX804_/MAX805_ only

100

MAX690T/S/R, MAX704T/S/R,

MAX802T/S/R, MAX804−MAX806T/S/R

3.0V/3.3V Microprocessor

Supervisory Circuits

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Electrical Characteristics (continued)

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