M48T86 datasheet(27/36 Pages) STMICROELECTRONICS

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M48T86

DC and AC parameters

27/36

Figure 14.

Power down/up mode AC waveforms

AI01646

VCC

trec

4.5V

VPFD

VSO

Table 13.

Power down/up mode AC characteristics

Symbol

Parameter(1)

Min

Max

Unit

(2)

VCC fall time

300

µs

VCC rise time

100

µs

trec

VPFD to E high

200

Valid for ambient operating temperature: TA = 0 to 70°C; VCC = 4.5 to 5.5V (except where noted).

VCC fall time of less than tF may result in deselection/write protection not occurring until 200µs after VCC passes VPFD.

Table 14.

Power down/up trip points DC characteristics

Symbol

Parameter(1)(2)

Min

Typ

Max

Unit

VPFD

Power-fail deselect voltage

4.0

4.35

VSO

Battery back-up switchover voltage

3.0

tDR

(3)

Expected data retention time

YEARS

Valid for ambient operating temperature: TA = 0 to 70°C; VCC = 4.5 to 5.5V (except where noted).

All voltages referenced to VSS.

At 25°C, VCC = 0V.

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