M48Z35 datasheet(12/23 Pages) STMICROELECTRONICS

12 / 23 page

Operating modes

M48Z35, M48Z35Y

12/23

For more information on Battery Storage Life refer to the Application Note AN1012.

Figure 8.

Power down/up mode AC waveforms

Table 5.

Power down/up AC characteristics

Table 6.

Power down/up trip points DC characteristics

Note:

All voltages referenced to VSS.

Symbol

Parameter(1)

Valid for ambient operating temperature: TA = 0 to 70°C; VCC = 4.75 to 5.5V or 4.5 to 5.5V (except where noted).

Min

Max

Unit

tPD

E or W at VIH before power down

µs

(2)

VPFD (max) to VPFD (min) fall time of less than tF may result in deselection/write protection not occurring until 200µs after

VCC passes VPFD (min).

VPFD (max) to VPFD (min) VCC fall time

300

µs

tFB

(3)

VPFD (min) to VSS fall time of less than tFB may cause corruption of RAM data.

VPFD (min) to VSS VCC fall time

µs

VPFD (min) to VPFD (max) VCC rise time

µs

tRB

VSS to VPFD (min) VCC rise time

µs

trec

VPFD (max) to inputs recognized

200

Symbol

Parameter(1)

Valid for ambient operating temperature: TA = 0 to 70°C; VCC = 4.75 to 5.5V or 4.5 to 5.5V (except where noted).

Min

Typ

Max

Unit

VPFD

Power-fail deselect voltage

M48Z35

4.5

4.6

4.75

M48Z35Y

4.2

4.35

4.5

VSO

Battery back-up switchover voltage

M48Z35/Y

3.0

tDR

(2)

At 25°C, VCC = 0V.

Expected data retention time

YEARS

AI01168C

VCC

INPUTS

(PER CONTROL INPUT)

OUTPUTS

DON'T CARE

HIGH-Z

tFB

tPD

tRB

tDR

VALID

(PER CONTROL INPUT)

RECOGNIZED

VPFD (max)

VPFD (min)

VSO

trec

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