M48Z129Y datasheet(15/20 Pages) STMICROELECTRONICS

15 / 20 page

M48Z129Y, M48Z129V

DC and AC parameters

Doc ID 5716 Rev 7

15/20

Figure 10.

Power down/up mode AC waveforms

AI03610

VCC

OUTPUTS

DON'T CARE

HIGH-Z

tFB

tRB

VALID

RECOGNIZED

VPFD (max)

VPFD (min)

VSO

tREC

RST

(PER CONTROL INPUT)

tWPT

tDR

Table 9.

Power down/up AC characteristics

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

M48Z129Y

µs

M48Z129V

150

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

µs

tRB

VSS to VPFD (min) VCC rise time

µs

tWPT

Write protect time

M48Z129Y

150

µs

M48Z129V

250

tREC

VPFD (max) to RST high

200

Valid for ambient operating temperature: TA = 0 to 70 °C; VCC = 4.5 to 5.5 V or 3.0 to 3.6 V (except where noted).

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

VCC passes VPFD (min).

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

Symbol

Parameter(1)(2)

Min

Typ

Max

Unit

VPFD

Power-fail deselect voltage

M48Z129Y

4.2

4.35

4.5

M48Z129V

2.7

2.9

3.0

VSO

Battery backup switchover voltage

M48Z129Y

3.0

M48Z129V

2.45

tDR

(3)

Expected data retention time

Years

All voltages referenced to VSS.

Valid for ambient operating temperature: TA = 0 to 70 °C; VCC = 4.5 to 5.5 V or 3.0 to 3.6 V (except where noted).

At 25 °C, VCC = 0 V.

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