M48T58 datasheet(16/27 Pages) STMICROELECTRONICS

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M48T58, M48T58Y

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Table 9. Power Down/Up AC Characteristics

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

2. All voltages referenced to VSS.

3. At 25°C.

Symbol

Parameter(1)

Min

Max

Unit

tPD

E1 or W at VIH or E2 at VIL before Power Down

0µs

(2)

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

300

µs

tFB

(3)

VPFD (min) to VSS VCC Fall Time

M48T58

µs

M48T58Y

µs

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

µs

tRB

VSS to VPFD (min) VCC Rise Time

1µs

tREC

VPFD (max) to Inputs Recognized

200

Symbol

Parameter(1,2)

Min

Typ

Max

Unit

VPFD

Power-fail Deselect Voltage

M48T58

4.5

4.6

4.75

M48T58Y

4.2

4.35

4.5

VSO

Battery Back-up Switchover Voltage

3.0

tDR

(3)

Expected Data Retention Time

YEARS

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