M41T256YMT7E datasheet(25/30 Pages) STMICROELECTRONICS

25 / 30 page

M41T256Y

DC and AC parameters

25/30

Figure 14.

Power down/up mode AC waveforms

Table 10.

Power down/up AC characteristics

Symbol

Parameter(1)

Valid for ambient operating temperature: TA = –25 to 70°C; VCC = 4.5 to 5.5V (except where noted).

Min

Typ

Max

Unit

(2)

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

µs

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

µs

tRB

VSS to VPFD (min) VCC rise time

µs

tREC

Power up deselect time

200

tDR

Expected data retention time (OSC on, sleep mode off)

7.2(4)

At 25°C and VCC = 0V with the oscillator running and using M4T32-BR12SH SNAPHAT battery top.

years

AI04757

VCC

INPUTS

(PER CONTROL INPUT)

OUTPUTS

DON'T CARE

HIGH-Z

tFB

tRB

tDR

VALID

(PER CONTROL INPUT)

RECOGNIZED

VPFD (max)

VPFD (min)

VSO

tREC

RST

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