M41T62LC6F datasheet(35/44 Pages) STMICROELECTRONICS

35 / 44 page

M41T62/63/64/65

DC and AC parameters

Doc ID 10397 Rev 19

35/44

Table 17.

Oscillator characteristics

Figure 26.

Bus timing requirements sequence

Table 18.

AC characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VSTA

Oscillator start voltage

≤ 10 seconds

1.5

tSTA

Oscillator start time

VCC = 3.0 V

XIN capacitance

XOUT capacitance

IC-to-IC frequency variation (1)(2)

Reference value. TA = 25 °C, VCC = 3.0 V, CMJ-145 (CL = 6 pF, 32,768 Hz) manufactured by Citizen,

CL = Cg • Cd / (Cg + Cd).

Devices in LCC8 package ((M41T62LC6F) are tested not to exceed

±20 ppm oscillator frequency error at

25 °C, which equates to about 52 seconds per month.

–10

+10

ppm

Sym

Parameter(1)

Valid for ambient operating temperature: TA = –40 to 85 °C; VCC = 1.3 to 4.4 V (except where noted).

Min

Max

Units

fSCL

SCL clock frequency

400

kHz

tLOW

Clock low period

1.3

µs

tHIGH

Clock high period

600

SDA and SCL rise time

300

SDA and SCL fall time

300

tHD:STA

START condition hold time

(after this period the first clock pulse is generated)

600

tSU:STA

START condition setup time

(only relevant for a repeated start condition)

600

tSU:DAT

(2)

Transmitter must internally provide a hold time to bridge the undefined region (300 ns max) of the falling

edge of SCL.

Data setup time

100

tHD:DAT

Data hold time

µs

tSU:STO

STOP condition setup time

600

tBUF

Time the bus must be free before a new

transmission can start

1.3

µs

trec

Watchdog output pulse width

AI00589

SDA

tSU:STO

tSU:STA

tHD:STA

SCL

tSU:DAT

tHD:DAT

tHIGH

tLOW

tHD:STA

tBUF

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