DSC572-05
Crystal-less™ XAUI + GPON Clock Generator
General Description
The DSC572-05 is a Crystal-less™ XAUI +
GPON clock generator. The device uses
Discera’s
proven
PureSilicon™
MEMS
technology to provide excellent jitter and
stability over a wide range of supply
voltages and temperatures. By eliminating
dependency
on
quartz,
MEMS
clock
generators significantly enhance reliability
and accelerate product development, while
meeting stringent clock performance criteria
for a variety of communications, storage,
and networking applications.
DSC572-05 has an Output Enable / Disable
feature allowing it to disable all outputs
when OE1 and OE2 are low. See the OE
table 1 for more detail.
The device is available in a 20 pin QFN.
Additional output formats are in any
combination of LVPECL, LVDS, and HCSL.
Advance Datasheet
Features
Four outputs:
o
o
2 XAUI: 156.25MHz LVPECL
2 GPON: 155.25MHz LVPECL
XAUI + GPON Ready
Available Output Formats:
o
o
o
o
o
HCSL, LVPECL, or LVDS
Mixed Outputs: LVPECL/HCSL/LVDS
Ext. Industrial: -40° to 105° C
Industrial: -40° to 85° C
Ext. commercial: -20° to 70° C
Wide Temperature Range
Supply Range of 2.25 to 3.6 V
Low Power Consumption
o
o
30% lower than competing devices
Qualified to MIL-STD-883
Excellent Shock & Vibration Immunity
Block Diagram
Available Footprints: 5.0 x 3.2mm
Lead Free & RoHS Compliant
Short Lead Time: 2 Weeks
Applications
Communications/Networking
o
o
o
o
o
Ethernet
1G, 10GBASE-T/KR/LR/SR, and FcoE
Routers and Switches
Gateways, VoIP, Wireless AP’s
Passive Optical Networks
Storage
o
SAN, NAS, SSD, JBOD
Embedded Applications
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DSC572-05
Crystal-less™ XAUI + GPON Clock Generator
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DSC572-05
Crystal-less™ XAUI + GPON Clock Generator
Specifications
(Unless specified otherwise: T=25° C,
VDD =3.3V)
Parameter
Supply Voltage
1
Condition
V
DD
I
DD
I
DD
Δf
t
SU
V
IH
V
IL
t
DA
t
EN
Pull-up on OE pin
EN pin low – outputs are
disabled
EN pin high – outputs are
enabled
R
L
=50 Ω, All outputs running
Includes frequency variations
due to initial tolerance, temp.
and power supply voltage
T=25°C
Min.
2.25
Typ.
42
120
Max.
3.6
46
Unit
V
mA
mA
Supply Current
Supply Current
2
(Two HCSL Outputs)
Frequency Stability
Startup Time
3
Input Logic Levels
Input logic high
Input logic low
Output Disable Time
4
Output Enable Time
Pull-Up Resistor
2
Output Logic Levels
Output logic high
Output logic low
Pk to Pk Output Swing
Output Transition time
Rise Time
Fall Time
Frequency
Output Duty Cycle
Integrated Phase Noise
4
±100
±50
5
0.75xV
DD
-
-
0.25xV
DD
5
20
40
ppm
ms
V
ns
ns
kΩ
XAUI/GPON LVPECL Output
V
OH
V
OL
R
L
=50Ω
Single-Ended
t
R
t
F
f
0
SYM
J
PH
20% to 80%
R
L
=50Ω, C
L
= 0pF (to GND)
Single Frequency
Differential
1.875MHz to 20MHz @156.25MHz
12kHz to 20MHz @156.25MHz
2.3
48
0.2
1.7
V
DD
-1.08
-
800
250
460
52
2
-
V
DD
-1.55
V
mV
ps
MHz
%
ps
RMS
Notes:
1. Pin 4 V
DD
should be filtered with 0.01uf capacitor.
2. Output is enabled if Enable pad is floated or not connected.
3. t
su
is time to stable output frequency after V
DD
is applied and outputs are enabled.
4. Output Waveform and Test Circuit figures below define the parameters.
5. Measured over 50k cycles.
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Crystal-less™ XAUI + GPON Clock Generator
Absolute Maximum Ratings
Item
Supply Voltage
Input Voltage
Junction Temp
Storage Temp
Soldering Temp
ESD
HBM
MM
CDM
Min
-0.3
-0.3
-
-55
-
-
Max
+4.0
V
DD
+0.3
+150
+150
+260
4000
400
1500
Unit
V
V
°C
°C
°C
V
Condition
40sec max.
Solder Reflow Profile
20-40
Sec
Temperature (°C)
217
°
C
200
°
C
.
ax
3C
/
Se
cM
ax
60-150
Sec
260
°
C
.
S
6C/
6C/
6C/
c
c
ec
Ma
Ma
Ma
150
°
C
3C
/
Se
60-180
Sec
cM
Reflow
.
.
x.
Pre heat
8 min max
Cool
Time
25
°
C
20 QFN
MSL 1 @ 260°C refer to JSTD-020C
Ramp-Up Rate (200°C to Peak Temp)
3°C/Sec Max.
Preheat Time 150°C to 200°C
60-180 Sec
Time maintained above 217°C
60-150 Sec
Peak Temperature
255-260°C
Time within 5°C of actual Peak
20-40 Sec
Ramp-Down Rate
6°C/Sec Max.
Time 25°C to Peak Temperature
8 min Max.
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Crystal-less™ XAUI + GPON Clock Generator
Pin Description (20 QFN)
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Pin Name
OE1
NC
VSS
VSS
CLK0-
CLK0+
CLK1-
CLK1+
VDD
NC
OE2
NC
VSS
VSS
CLK2-
CLK2+
CLK3-
CLK3+
VDD
NC
Pin Type
I
NA
Power
Power
O
O
O
O
Power
NA
I
NA
Power
Power
O
O
O
O
Power
NA
Description
Output Enable; active high
Leave unconnected or grounded
Ground
Ground
Complement output of differential pair
True output of differential pair (XAUI)
Complement output of differential use
True output of differential pair (GPON)
Power Supply
Leave unconnected or grounded
Output Enable; active high
Leave unconnected or grounded
Ground
Ground
Complement output of differential pair
True output of differential pair (GPON)
Complement output of differential pair
True output of differential pair (XAUI)
Power Supply
Leave unconnected or grounded
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