M48T128Y datasheet(18/22 Pages) STMICROELECTRONICS

18 / 22 page

M48T128Y, M48T128V*

18/22

Figure 12. Power Down/Up Mode AC Waveforms

Table 10. Power Down/Up AC Characteristics

Note: 1. Valid for Ambient Operating Temperature: TA = 0 to 70°C; VCC = 4.5 to 5.5V or 3.0 to 3.6V (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 11. 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; VCC = 4.5 to 5.5V or 3.0 to 3.6V (except where noted).

3. At 25°C; VCC = 0V.

Symbol

Parameter(1)

Min

Max

Unit

(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

VPFD (max) to Inputs Recognized

200

Symbol

Parameter(1,2)

Min

Typ

Max

Unit

VPFD

Power-fail Deselect Voltage

M48T128Y

4.1

4.35

4.5

M48T128V

2.7

2.9

3.0

VSO

Battery Back-up Switchover Voltage

M48T128Y

3.0

M48T128V

VPFD –100mV

tDR

(3)

Expected Data Retention Time

YEARS

AI03612

VCC

INPUTS

OUTPUTS

DON'T CARE

HIGH-Z

tFB

tDR

tREC

tRB

VALID

RECOGNIZED

VPFD (max)

VPFD (min)

VSS

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