STLED325 datasheet(38/62 Pages) STMICROELECTRONICS

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Electrical ratings

STLED325

38/62

Doc ID 17576 Rev 1

4.4

Oscillator and crystal characteristics

Table 19.

Crystal electrical characteristics

Note:

Oscillator is not production tested.

Externally supplied. ST recommends the Citizen CFS-145 (1.5 x 5 mm) and the KDS DT-38

(3 x 8 mm) 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.

Guaranteed by design.

Table 18.

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 deg C, VCC = 3.0 V, CFM-145 (CL = 6 pF, 32.768 KHz) manufactured by Citizen.

-20

+20

Ppm

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

Resonant

frequency(1)

Externally supplied. ST recommends the Citizen CFS-145 (1.5 x 5 mm) and the KDS DT-38 (3 x 8 mm) 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

32.768

KHz

Series resistance(2)

Circuit board layout considerations for the 32.768KHz crystal of minimum trace lengths and isolation from

RF generating signals should be taken into account.

40(3)

Load capacitance

12.5

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