M41T256YMT7E datasheet(21/27 Pages) STMICROELECTRONICS

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M41T256Y

Figure 17. Power Down/Up Mode AC Waveforms

Table 10. Power Down/Up AC Characteristics

Note: 1. Valid for Ambient Operating Temperature: TA = –25 to 70°C; VCC = 4.5 to 5.5V (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.

4. At 25°C and VCC = 0V, using a BR2330 Li Battery. This drops to 7.2 years when using the M4T32-BR12SH with the oscillator run-

ning.

Symbol

Parameter(1)

Min

Typ

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

µs

tRB

VSS to VPFD (min) VCC Rise Time

1µs

tREC

Power up Deselect Time

200

tDR

Expected Data Retention Time (OSC On, Sleep Mode

Off)

15(4)

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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