M48Z02 datasheet(16/20 Pages) STMICROELECTRONICS

16 / 20 page

DC and AC parameters

M48Z02, M48Z12

16/20

Table 9.

Power down/up AC characteristics

Table 10.

Power down/up trip points DC characteristics

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

E or W at VIH after power up

Symbol

Parameter(1)(2)

All voltages referenced to VSS.

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

M48Z02

4.5

4.6

4.75

M48Z12

4.2

4.3

4.5

VSO

Battery back-up switchover voltage

3.0

tDR

(3)

At 25°C, VCC = 0V.

Expected data retention time

YEARS

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