M48Z02 datasheet(11/16 Pages) STMICROELECTRONICS

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M48Z02, M48Z12

Table 9. Power Down/Up AC Characteristics

Note: 1. Valid for Ambient Operating Temperature: TA = 0 to 70°C or –40 to 85°C; VCC = 4.75 to 5.5V or 4.5 to 5.5V (except where noted).

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

es VPFD (min).

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

Table 10. Power Down/Up Trip Points DC Characteristics

Note: 1. All voltages referenced to VSS.

2. Valid for Ambient Operating Temperature: TA = 0 to 70°C or –40 to 85°C; VCC = 4.75 to 5.5V or 4.5 to 5.5V (except where noted).

3. At 25°C, VCC = 0V.

Figure 11. Crystal Accuracy Across Temperature

Symbol

Parameter(1)

Min

Max

Unit

tPD

E or W at VIH before Power Down

0µs

(2)

VPFD (max) to VPFD (min) VCC Fall Time

300

µs

tFB

(3)

VPFD (min) to VSS VCC Fall Time

µs

VPFD (min) to VPFD (max) VCC Rise Time

0µs

tRB

VSS to VPFD (min) VCC Rise Time

1µs

tREC

E or W at VIH after Power Up

2ms

Symbol

Parameter(1,2)

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)

Expected Data Retention Time

YEARS

AI02124

-80

-60

-100

-40

-20

∆F

= -0.038

(T - T

± 10%

ppm

0 = 25 °C

ppm

°C

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