ICS8533AG-11 ICST [Integrated Circuit Systems], ICS8533AG-11 Datasheet - Page 10

• Manufacturer Part Number: ICS8533AG-11
• Description: LOW SKEW, 1-TO-4, CRYSTAL OSCILLATOR/ DIFFERENTIAL-TO-3.3V LVPECL FANOUT BUFFER
• Manufacturer: ICST [Integrated Circuit Systems]

Figure 12 shows how the differential input can be wired to accept single ended levels. The reference voltage V_REF ~ V
generated by the bias resistors R1, R2 and C1. This bias circuit should be located as close as possible to the input pin. The ratio of
R1 and R2 might need to be adjusted to position the V_REF in the center of the input voltage swing. For example, if the input clock
swing is only 2.5V and V
REV. D JULY 16, 2001
F
-20
-40
-60
60
40
20
IGURE
0
W
0
IRING THE
11 - C
CC
= 3.3V, V_REF should be 1.25V and R2/R1 = 0.609.
10
RYSTAL
F
IGURE
D
20
IFFERENTIAL
O
12: S
SCILLATOR
CLK_IN
30
Temperature (deg. C)
INGLE
0.1uF
C1
C
E
RCUIT
40
NDED
I
NPUT TO
D
F
S
IFFERENTIAL
REQUENCY
R1
1K
V_REF
R2
1K
IGNAL
50
10
A
V
L
D
CC
CCEPT
OW
RIVING
+
-
60
D
RIFTED
S
-
D
TO
KEW
IFFERENTIAL
S
70
D
-3.3V LVPECL F
INGLE
UE TO
, 1-
80
T
TO
EMPERATURE
E
I
NPUT
NDED
-4, C
L
RYSTAL
EVELS
ICS8533-11
V
ARIATION
19.44MHz
16.666MHz
ANOUT
O
SCILLATOR
B
UFFER
CC
/2 is
/