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ZL40209LDG1

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26
ZL40209 Data Sheet
15
Microsemi Corporation
3.4 Device Additive Jitter
The ZL40209 clock fanout buffer is not intended to filter clock jitter. The jitter performance of this type of device is
characterized by its additive jitter. Additive jitter is the jitter the device would add to a hypothetical jitter-free clock as
it passes through the device. The additive jitter of the ZL40209 is random and as such it is not correlated to the jitter
of the input clock signal.
The square of the resultant random RMS jitter at the output
of the ZL40209 is equal to the sum of the squares of the
various random RMS jitter sources including: input clock jitter; additive jitter of the buffer; and additive random jitter
due to power supply noise. There may be additional deterministic jitter sources that are not shown in Figure 19.
+
J
in
2
J
out
2
= J
in
2
+J
add
2
+J
ps
2
J
add
2
J
ps
2
J
in
= Random input clock jitter (RMS)
J
add
= Additive jitter due to the device (RMS)
J
ps
= Additive jitter due to power supply noise (RMS)
J
out
= Resultant random output clock jitter (RMS)
+
Figure 19 - Additive Jitter
ZL40209 Data Sheet
16
Microsemi Corporation
3.5 Power Supply
This device operates with either a 2.5V supply or 3.3V supply.
3.5.1 Sensitivity to power supply noise
Power supply noise from sources such as switching power supplies and high-power digital components such as
FPGAs can induce additive jitter on clock buffer outputs. The ZL40209 is equipped with an on-chip linear power
regulator and on-chip bulk capacitors to minimize additive jitter due to power supply noise. The on-chip regulation,
recommended power supply filtering, and good PCB layout all work together to minimize the additive jitter from
power supply noise.
3.5.2 Power supply filtering
For optimal jitter performance, the ZL40209 should be isolated from the power planes connected to its power
supply pins as shown in Figure 20.
• 10 µF capacitors should be size 0603 or size 080
5 X5R or X7R ceramic, 6.3 V minimum rating
• 0.1 µF capacitors should be
size 0402 X5R ceramic, 6.3 V minimum rating
• Capacitors should be placed next to the
connected device power pins
VDD
0.15 Ohms
10 µF
0.1 µF
0.1 µF
0.1 µF
ZL40209
11
16
18
23
0.1 µF
10 µF
25
30
Figure 20 - Decoupling Connections for Power Pins
3.5.3 PCB layout considerations
The power supply filtering shown in Figure 20 can be implemented either as a plane island, or as a routed power
topology with equal results.
Absolute Maximum Ratings*
Parameter Sym. Min. Max. Units
1 Supply voltage V
DD_R
-0.5 4.6 V
2 Voltage on any digital pin V
PIN
-0.5 V
DD
V
3 LVPECL output current I
out
30 mA
4 Soldering temperature T 260 °C
5 Storage temperature T
ST
-55 125 °C
6 Junction temperature T
j
125 °C
7 Voltage on input pin V
input
V
DD
V
8 Input capacitance each pin C
p
500 fF
ZL40209 Data Sheet
17
Microsemi Corporation
4.0 AC and DC Electrical Characteristics
* Exceeding these values may cause permanent damage. Functional operation under these conditions is not implied.
* Voltages are with respect to ground (GND) unless otherwise stated
Recommended Operating Conditions*
Characteristics Sym. Min. Typ. Max. Units
1 Supply voltage 2.5 V mode V
DD25
2.375 2.5 2.625 V
2 Supply voltage 3.3 V mode V
DD33
3.135 3.3 3.465 V
3 Operating temperature T
A
-40 25 85 °C
* Voltages are with respect to ground (GND) unless otherwise stated
DC Electrical Characteristics - Current Consumption
Characteristics Sym. Min. Typ. Max. Units Notes
1 Supply current LVPECL drivers -
un
loaded
I
dd_unload
110 mA
2
Supply current LVPECL drivers -
loa
ded (all outputs are active)
I
dd_load
214 mA Including power
to R
L
= 50Ω
DC Electrical Characteristics - Inputs and Outputs - for 3.3 V Supply
Characteristics Sym. Min. Typ. Max. Units Notes
1 CMOS control logic high-level
input
voltage
V
CIH
0.7*V
DD
V
2 CMOS control logic low
-level input
voltage
V
CIL
0.3*V
DD
V
3 CMOS control logic Input leakage
current
I
IL
1 µA V
I
= V
DD
or 0 V
4 Differential input common mode
volt
age
V
CM
1.1 2.0 V
5 Differential input voltage difference V
ID
0.25 1 V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-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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