M41T256YMT7 查看數據表（PDF） - STMicroelectronics

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M41T256YMT7

256 Kbit (32K x8) Serial RTC

STMicroelectronics 

Figure 17. Power Down/Up Mode AC Waveforms

VCC

VPFD (max)

VPFD (min)

VSO

tF

tFB

tRB

tDR

INPUTS

RECOGNIZED

DON'T CARE

M41T256Y

tR

tREC

RECOGNIZED

RST

OUTPUTS

VALID

(PER CONTROL INPUT)

HIGH-Z

VALID

(PER CONTROL INPUT)

AI04757

Table 10. Power Down/Up AC Characteristics

Symbol

Parameter(1)

Min

Typ

Max

Unit

tF(2)

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

300

µs

tFB(3)

VPFD (min) to VSS VCC Fall Time

10

µs

tR

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

10

µs

tRB

VSS to VPFD (min) VCC Rise Time

1

µs

tREC

Power up Deselect Time

40

200

ms

tDR

Expected Data Retention Time (OSC On, Sleep Mode

Off)

15(4)

YEARS

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.

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