M48Z512AV datasheet(17/24 Pages) STMICROELECTRONICS

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M48Z512A M48Z512AY M48Z512AV

DC and ac parameters

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Table 10.

Power Down/Up ac characteristics

Symbol

Parameter(1)

Valid for ambient operating temperature: TA = 0 to 70°C or -40 to 85°C; VCC = 4.75 to 5.5V, 4.5 to 5.5V, or

3.0 to 3.6V (except where noted).

Min

Max

Unit

(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

M48Z512A/Y

µs

M48Z512AV

150

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

µs

tRB

VSS to VPFD (min) VCC rise time

µs

tWPT

WRITE Protect time

M48Z512A/Y

150

µs

M48Z512AV

250

tER

E Recovery time

120

Table 11.

Power Down/Up trip points dc characteristics

Symbol

Parameter(1)(2)

All voltages referenced to VSS.

Valid for ambient operating temperature: TA = 0 to 70°C or -40 to 85°C; VCC = 4.75 to 5.5V, 4.5 to 5.5V, or

3.0 to 3.6V (except where noted).

Min

Typ

Max

Unit

VPFD

Power-fail deselect voltage

M48Z512A

4.5

4.6

4.75

M48Z512AY

4.2

4.3

4.5

M48Z512AV

2.8

2.9

3.0

VSO

Battery back-up switchover voltage

M48Z512A/Y

3.0

M48Z512AV

2.5

tDR

(3)

At 25°C; VCC = 0V.

Expected data retention time

Years

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