M48Z2M1Y datasheet(13/17 Pages) STMICROELECTRONICS

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M48Z2M1Y, M48Z2M1V

Figure 11. Power Down/Up Mode AC Waveforms

Table 9. 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 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; 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

tER

E Recovery Time

120

(2)

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

300

µs

tFB

(3)

VPFD (min) to VSO VCC Fall Time

M48Z2M1Y

µs

M48Z2M1V

150

µs

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

µs

tWP

Write Protect Time from VCC = VPFD

M48Z2M1Y

150

µs

M48Z2M1V

250

µs

Symbol

Parameter(1,2)

Min

Typ

Max

Unit

VPFD

Power-fail Deselect Voltage

M48Z2M1Y

4.2

4.3

4.5

M48Z2M1V

2.8

2.9

3.0

VSO

Battery Back-up Switchover Voltage

M48Z2M1Y

3.0

M48Z2M1V

2.45

tDR

(3)

Expected Data Retention Time

YEARS

AI01031

VCC

(PER CONTROL INPUT)

OUTPUTS

DON'T CARE

HIGH-Z

tFB

tRB

tWP

tDR

VALID

(PER CONTROL INPUT)

RECOGNIZED

VPFD (max)

VPFD (min)

VSO

tER

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