M41T94 datasheet(32/40 Pages) STMICROELECTRONICS

部品番号	M41T94

部品情報	Serial Real Time Clock with 44Bytes NVRAM and Reset

PDF	40 Pages

Scroll/Zoom	100%

メーカー	STMICROELECTRONICS [STMicroelectronics]

ホームページ	http://www.st.com

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32 / 40 page

DC and AC parameters

M41T94

32/40

Figure 17.

Power down/up mode AC Waveforms

Table 15.

Power Down/Up AC Characteristics

Symbol

Parameter(1)

Valid for ambient operating temperature: TA = –40 to 85°C; VCC = 2.7 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

(4)

Programmable (seeTable 8 on page 28).

Power up deselect time

200

tDR

Expected data retention time

10(5)

At 25°C, VCC = 0V (when using SOH28 + M4T28-BR12SH SNAPHAT top).

YEARS

AI03687

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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