M41T62 datasheet(33/40 Pages) STMICROELECTRONICS

33 / 40 page

M41T62/63/64/65

DC and AC parameters

33/40

Table 16.

Oscillator characteristics

Figure 25.

Bus timing requirements sequence

Table 15.

Crystal electrical characteristics

Sym

Parameter(1)(2)

Externally supplied if using the QFN16 package. STMicroelectronics recommends the Citizen CFS-145

(1.5x5mm) and the KDS DT-38 (3x8mm) for thru-hole, or the KDS DMX-26S (3.2x8mm) for surface-mount,

tuning fork-type quartz crystals.

KDS can be contacted at kouhou@kdsj.co.jp or http://www.kdsj.co.jp.

Citizen can be contacted at csd@citizen-america.com or http://www.citizencrystal.com.

Load capacitors are integrated within the M41T6x. Circuit board layout considerations for the 32.768kHz

crystal of minimum trace lengths and isolation from RF generating signals should be taken into account.

Min

Typ

Max

Units

Resonant frequency

32.768

kHz

Series resistance (T

A = –40 to 70°C, oscillator start-up at 2.0V)

75(3)(4)

Guaranteed by design.

RS (max) = 65kΩ for TA = –40 to 85°C and oscillator start-up at 1.5V.

Ω

Load capacitance

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VSTA

Oscillator start voltage

≤10 seconds

1.5

tSTA

Oscillator start time

VCC = 3.0V

XIN

XOUT

IC-to-IC frequency variation (1)

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

–10

+10

ppm

AI00589

SDA

tSU:STO

tSU:STA

tHD:STA

SCL

tSU:DAT

tHD:DAT

tHIGH

tLOW

tHD:STA

tBUF

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