M41T11 datasheet(21/29 Pages) STMICROELECTRONICS

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M41T11

DC and AC parameters

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Figure 15.

Power down/up mode AC waveforms

Table 9.

Power down/up AC characteristics

Symbol

Parameter(1)(2)

Valid for ambient operating temperature: TA = –40 to 85°C; VCC = 2.0 to 5.5 V (except where noted).

VCC fall time should not exceed 5 mV/µs.

Min

Max

Unit

tPD

SCL and SDA at VIH before power down

tREC

SCL and SDA at VIH after power up

µs

Table 10.

Power down/up trip points DC characteristics

Symbol

Parameter(1)(2)

Valid for ambient operating temperature: TA = –40 to 85°C; VCC = 2.0 to 5.5 V (except where noted).

All voltages referenced to VSS.

Min

Typ

Max(3)

In 3.3 V application, if initial battery voltage is

≥ 3.4 V, it may be necessary to reduce battery voltage (i.e.,

through wave soldering the battery) in order to avoid inadvertent switchover/deselection for VCC – 10%

operation.

Unit

VSO

(4)

Switchover and deselect point.

Battery back-up switchover voltage

VBAT – 0.80

VBAT – 0.50

VBAT – 0.30

AI00596

VCC

tREC

tPD

VSO

SDA

SCL

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