M48T129V datasheet(23/28 Pages) STMICROELECTRONICS

23 / 28 page

M48T129V, M48T129Y

DC and AC parameters

Doc ID 5710 Rev 4

23/28

Figure 14.

Power down/up mode AC waveforms

Table 11.

Power down/up AC characteristics

Table 12.

Power down/up trip points DC characteristics

Symbol

Parameter(1)

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).

Min

Max

Unit

(2)

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 (max) to VPFD (min) VCC fall time

300

µs

tFB

(3)

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

VPFD (min) to VSS VCC fall time

M48T129Y

µs

M48T129V

150

µs

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

µs

tRB

VSS to VPFD (min) VCC rise time

µs

tREC

VPFD (max) to RST high

200

AI01805

VCC

INPUTS

OUTPUTS

DON'T CARE

HIGH-Z

tFB

tRB

VALID

RECOGNIZED

VPFD (max)

VPFD (min)

VSO

tREC

RST

Symbol

Parameter(1)(2)

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).

Min

Typ

Max

Unit

VPFD

Power-fail deselect voltage

M48T129Y

4.2

4.35

4.5

M48T129V

2.7

2.9

3.0

VSO

Battery backup switchover voltage

M48T129Y

3.0

M48T129V

VPFD –100mV

tDR

(3)

At 25 °C; VCC = 0 V.

Expected data retention time

YEARS

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