ics8536-01 Integrated Device Technology, ics8536-01 Datasheet - Page 10

• Manufacturer Part Number: ics8536-01
• Description: Xtal, Lvcmos, Differential Input Lvpecl Output 1 6 266-mhz Buffer
• Manufacturer: Integrated Device Technology

W
C
The ICS8536-01 has been characterized with 18pF parallel
resonant crystals. The capacitor values shown in Figure 2 below
IDT
Figure 1 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
RYSTAL
ICS8536-01
LOW SKEW, 1-TO-6, CRYSTAL/LVCMOS/DIFFERENTIAL-TO-3.3V, 2.5V LVPECL FANOUT BUFFER
IRING THE
™
/ ICS
™
3.3V, 2.5V LVPECL FANOUT BUFFER
I
NPUT
D
IFFERENTIAL
I
NTERFACE
I
NPUT TO
18pF Parallel Crystal
F
IGURE
Single Ended Clock Input
A
CCEPT
1. S
A
X1
PPLICATION
F
INGLE
IGURE
S
INGLE
E
C1
0.1u
2. C
NDED
V_REF
CC
/2 is
E
RYSTAL
NDED
S
C1
33p
C2
27p
IGNAL
10
I
L
NFORMATION
I
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
and R2/R1 = 0.609.
were determined using an 18pF parallel resonant crystal and
were chosen to minimize the ppm error.
NPU
XTAL_OUT
XTAL_IN
D
EVELS
1K
R1
1K
R2
RIVING
t I
VCC
NTERFACE
D
CLK
nCLK
IFFERENTIAL
I
NPUT
ICS8536AG-01 REV. B NOVEMBER 3, 2006
CC
= 3.3V, V_REF should be 1.25V
PRELIMINARY