M41T94 datasheet(31/41 Pages) STMICROELECTRONICS

Il numero della parte	M41T94

Spiegazioni elettronici	Serial real-time clock with 44 bytes NVRAM and reset

PDF	41 Pages

Scroll/Zoom	100%

Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

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31 / 41 page

M41T94

DC and AC parameters

31/41

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 5.5 V (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 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

µs

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

µs

tRB

VSS to VPFD (min) VCC rise time

µs

tREC

(4)

Programmable (see Table 8 on page 27).

Power up deselect time

200

tDR

Expected data retention time

10(5)

At 25°C, VCC = 0 V (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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