HFC-S+ Cologne Chip AG, HFC-S+ Datasheet - Page 60

• Manufacturer Part Number: HFC-S+
• Description: Isdn S/t HDLC Basic Rate Controller
• Manufacturer: Cologne Chip AG

863 C
7.3
Figure 9: Oscillator Circuitry
The values of C1, C2 and R1, R2 depend on the used quartz.
For a load-free check of the oscillator frequency the C4O clock of the GCI/IOM2 bus should be
measured (HFC-S+ as master, S/T interface deactivated, 4.096 MHz frequency intented on the C4IO).
The input signal on OSC_IN should be as big as possible.
& _V '
Oscillator circuitry
C 1
C 2
Q 1
R 1
R 2
O S C _ I N
O S C _ O U T
Part list:
Q1
R1
R2
C1, C2 47 pF
12.288 MHz quartz
0..50
1 M
:Q^eQbi " !
Cologne
Chip