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ZL40209LDG1
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
P16-P18
P19-P21
P22-P24
P25-P26
ZL40209
Data Sheet
12
Microsemi Corporation
3.3 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 different device with the same input
s and L
VDS outputs.
Figure 13 - Simplified Output Driver
out_p
out_n
The methods to terminate the ZL40209 L
VPECL dr
ivers are shown in the following figures.
LVP
E
CL
Rece
i
ver
50
Ohms
50
Ohms
VDD
VDD
Z
o
= 50 Ohm
s
Z
o
= 50 Ohm
s
ZL40209
cl
k_p
cl
k_n
VDD -
2
Figure 14 - L
VPEC
L 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
ZL40209
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
ZL40209
Data Sheet
13
Microsemi Corporation
R2
R2
VDD
VDD_
Rx
Z
o
= 50 Ohm
s
Z
o
= 50 Ohm
s
ZL40209
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_
Rx
R1
R1
LVP
E
CL
Rece
i
ver
Figure 16 - L
VPECL Pa
ral
lel
The
ven
in-
Equ
iva
lent
Output T
ermination
R2
R2
VDD
VDD_Rx
Z
o
= 50 Ohms
Z
o
= 50 Ohms
ZL40209
clk_p
clk_n
For VDD_Rx = 2.5
V: R1 = 250 Ohms,
R2 = 62.5 Ohms
For VDD_Rx = 3.3
V: R1 = 127 Ohms,
R2 = 82 Ohms
VDD_Rx
R1
R1
LVPECL
Receiver
RR
For VDD = 2.5 V: R
= 60 Ohms
For VDD = 3.3 V: R
= 120 Ohms
100 nF
100 nF
Figure 17 - L
VPECL AC
Output T
ermination
ZL40209
Data Sheet
14
Microsemi Corporation
VDD
VDD_
Rx
Z
o
= 50 Ohm
s
Z
o
= 50 Ohm
s
ZL40209
cl
k_p
cl
k_n
100 nF
100 nF
50
CM
L
Rece
i
ver
50
R
For
VD
D = 2.5 V:
R
= 60 Ohm
s
For
VD
D = 3.
3 V:
R = 120 Ohm
s
R
Figure 18 - L
VPECL AC Output T
ermination for CML Input
s
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
P16-P18
P19-P21
P22-P24
P25-P26
ZL40209LDG1
Mfr. #:
Buy ZL40209LDG1
Manufacturer:
Microchip / Microsemi
Description:
Clock Buffer 2:6 LVPECL Fanout Buffer w/Int. Term.
Lifecycle:
New from this manufacturer.
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