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ZL40223LDF1
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
P16-P18
P19-P21
P22-P23
2 µs
clk0
clk1
sel
out
n
1
0
ZL40223
Data Sheet
7
Microsemi Corporation
Figure 4 - Out
put During Clock Switch - Both
Clocks Running
3.1.2 Clock Input T
erminations
This following figures give the component
s values and conf
iguration for the variou
s circuits compatible with the
input stage and the us
e of the
Vt
and
ctrl
pins in each case.
In the following diagrams were the
ct
rl
pin is "1"
and the
Vt
pin is not connec
ted, the
Vt
pin can be instead
connected to V
DD
with a capacitor
. A capa
citor can also help in
Figure 5
betwee
n
Vt
and V
DD
. This capacitor will
minimize the noise at the point betwee
n the two inter
nal termination resistor
s an
d improve the overall performance
of the device.
LVPECL
Driver
R
VDD_driver
VDD
Z
o
= 50 Ohms
Z
o
= 50 Ohms
c
l
k
_
p
c
l
k
_
n
V
t
C
t
r
l
clk_p
clk_n
Vt
Ctrl
“0”
For 3.3 V: R= 50 Ohms
For 2.5 V: R= 22 Ohms
22 Ohms
22 Ohms
Figure 5 -
Clock Inpu
t -
L
VPECL - DC
Coupled
LVPECL
Driver
VDD_driver
VDD
Z
o
= 50 Ohms
Z
o
= 50 Ohms
clk_p
clk_n
Vt
Ctrl
“1”
For 3.3 V: R= 150 Ohms
For 2.5 V: R= 85 Ohms
NC
R
R
22 Ohms
22 Ohms
LVDS
Driver
VDD_driver
VDD
Z
o
= 50 Ohms
Z
o
= 50 Ohms
clk_p
clk_n
Vt
Ctrl
“0”
NC
ZL40223
Data Sheet
8
Microsemi Corporation
Figure 6 -
Clock Inpu
t -
L
VPECL - AC
Coupled
Figure 7 -
Clock Input -
L
VDS - DC Coupled
LVDS
Driver
VDD_driver
VDD
Z
o
= 50 Ohms
Z
o
= 50 Ohms
clk_p
clk_n
Vt
Ctrl
“1”
NC
R
For VDD_driver = 3.
3 V: R= 900 Ohms
For VDD_driver = 2.5 V: R = 680 Ohms
Note: This R is only needed to provide a DC
path for the LVDS driver. See driver data
sheet for more information.
CML
Driver
VDD_driver
VDD
Z
o
= 50 Ohms
Z
o
= 50 Ohms
clk_p
clk_n
Vt
Ctrl
“1”
R= 50 Ohms
NC
R
R
ZL40223
Data Sheet
9
Microsemi Corporation
Figure 8 -
Clock In
put -
L
VDS - AC Coupled
Figure 9 -
Clock Input -
CML- AC Coupled
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
P16-P18
P19-P21
P22-P23
ZL40223LDF1
Mfr. #:
Buy ZL40223LDF1
Manufacturer:
Microchip / Microsemi
Description:
Clock Buffer 2:8 LVDS Fanout Buffer w/Int. Term.
Lifecycle:
New from this manufacturer.
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