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ZL40210LDG1
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
P16-P18
P19-P21
P22-P24
P25-P27
ZL40210
Data Sheet
12
Microsemi Corporation
3.2 Clock Output
s
L
VPECL has a very low output impedance and a differential signal swing between 1V and 1.6
V
. A simplified
diagram for the output stage is shown in Figure 13
.The L
VPECL to L
VDS output termination is not shown since
there is a separate device that has the same input and L
VDS outputs.
out_p
out_n
Figure 13 - Simplified Output Driver
The methods to terminate the ZL40210 L
VPECL dr
ivers are shown in the following figures.
LVP
E
CL
Rece
i
ver
50
Ohms
50
Ohms
VDD
VDD_
Rx
Z
o
= 50 Ohm
s
Z
o
= 50 Ohm
s
ZL40210
cl
k_p
cl
k_n
VDD -
2
Figure 14 - L
VPECL Basic Output T
ermination
LVP
E
CL
Rece
i
ver
50
Ohms
50
Ohms
VDD
VDD_
Rx
Z
o
= 50 Ohm
s
Z
o
= 50 Ohm
s
ZL40210
cl
k_p
cl
k_n
R
For
VDD
= 2.
5 V:
R = 20
O
hm
s
For
VDD
= 3.
3 V:
R = 50
O
hm
s
Figure 15
- L
VPECL Pa
rallel Outp
ut T
ermina
tion
ZL40210
Data Sheet
13
Microsemi Corporation
R2
R2
VDD
VDD_
Rx
Z
o
= 50 Ohm
s
Z
o
= 50 Ohm
s
ZL40210
cl
k_p
cl
k_n
For
VDD
= 2.
5 V:
R1 = 250 Ohm
s,
R2 = 62
.5
O
hm
s
For
VDD
= 3.
3 V:
R1 = 127 Ohm
s,
R2 = 82
O
hm
s
VDD
R1
R1
LVP
E
CL
Rece
i
ver
Figure 16 - L
VPECL Pa
ral
lel
The
ven
in-
Equ
iva
lent
Output T
ermination
VDD
VDD_Rx
Z
o
= 50 O
hm
s
Z
o
= 50 O
hm
s
ZL40210
cl
k_
p
cl
k_
n
100 nF
100 nF
R
LVPE
CL
Rec
ei
ver
50
Ohm
50
Ohm
R
VDD
= 3.
3V:
R
= 120 Ohm
VDD
= 2.
5 V: R = 60 Ohm
VD
D= 3.3V:
R2
= 50 Ohm
VDD =
2.
5 V:
R2 =
20 Ohm
R2
Figure 17 - L
VPECL AC Output T
erminati
on for Externally T
erminated L
VPECL Inputs
ZL40210
Data Sheet
14
Microsemi Corporation
VDD
VDD_Rx
Z
o
= 50 O
hm
s
Z
o
= 50 O
hm
s
ZL40210
cl
k_
p
cl
k_
n
100 nF
100 nF
R
LVPE
CL
Rec
ei
ver
2K
Ohm
2K
Ohm
R
VDD
= 3.
3V:
R
= 120 Ohm
VDD
= 2.
5 V: R = 60 Ohm
2K
Ohm
2K
Ohm
Figure 18 - L
VPECL AC Output T
ermination
for Internally T
erminated L
VPECL Inputs
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
P16-P18
P19-P21
P22-P24
P25-P27
ZL40210LDG1
Mfr. #:
Buy ZL40210LDG1
Manufacturer:
Microchip / Microsemi
Description:
Clock Buffer 2:8 LVPECL Fanout Buffer w/Ext. Term.
Lifecycle:
New from this manufacturer.
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