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STFPC320 Datasheet(PDF) 71 Page - STMicroelectronics

No. de pieza STFPC320
Descripción Electrónicos  Front panel controller/driver with standby power management and real-time clock
PDF  78 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STFPC320 Datasheet(HTML) 71 Page - STMicroelectronics

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STFPC320
Electrical characteristics
71/78
17.5
Crystal electrical characteristics
17.6
Oscillator characteristics
Table 18.
Crystal electrical characteristics
Symbol
Parameter (1) (2)
1.
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
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.
Min
Typ
Max
Units
fO
Resonant frequency
32.768
kHz
RS
Series resistance
35
40 (3)
3.
Guaranteed by design.
k
Ω
CL
Load capacitance
12.5
pF
Table 19.
Oscillator characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VSTA
Oscillator start voltage
≤10 seconds
1.5
V
tSTA
Oscillator start time
VCC = 3.0 V
1
s
CL1
XIN
25
pF
CL2
XOUT
25
pF
IC-to-IC frequency
variation (1)
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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