STFPC320 datasheet(71/78 Pages) STMICROELECTRONICS

71 / 78 page

STFPC320

Electrical characteristics

71/78

17.5

Crystal electrical characteristics

17.6

Oscillator characteristics

Table 18.

Crystal electrical characteristics

Symbol

Parameter (1) (2)

Externally supplied. ST 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-americal.com or http://www.citizencrystal.com

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

40 (3)

Guaranteed by design.

Ω

Load capacitance

12.5

Table 19.

Oscillator characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VSTA

Oscillator start voltage

≤10 seconds

1.5

tSTA

Oscillator start time

VCC = 3.0 V

CL1

XIN

CL2

XOUT

IC-to-IC frequency

variation (1)

Reference value. TA = 25° C, VCC = 3.0V, CFM-145 (CL = 6pF, 32.768 KHz) manufactured by Citizen

-10

+10

ppm

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