Digi NS7520B-1-C36 Hardware Reference Manual page 276

O s c i l l a t o r C h a r a c t e r i s t i c s
Rise time = 18ns;
0.8V to 2.0V
RESET_
3R3V
TB1
Figure 31: Oscillator circuit details
2 6 4
U1
1
NC
2
LVC04
Optional 36.864-55.296MHz Oscillator
PLL bypassed - U1 & R2 OUT, R1 IN
Y2
4
VCC
2
GND
C3 1
TEST OUT
100nF SM_Oscillator
A 18.432MHz crystal or 55.296MHz
oscillator allows full speed operation.
C1
10pF
X2
C2
10pF 10-20MHz
PLL enabled - U1 & R2 IN, R1 OUT
N S 7 5 2 0 H a r d w a r e R e f e r e n c e , R e v G 9 / 2 0 0 7
3R3V
R1
5 10K
R2 L13
4
3 0 OHM
A10
R11
3
100 OHM
K14
XTAL1
R3
1M
R4
K12
XTAL2
0 OHM
SCANEN_
RESET_
NS7520
XTAL1
XTAL2