Micrel DSC557-052441KE1T Crystal-lessâ ¢ four output pcie clock generator Datasheet

DSC557-05
Crystal-less™ Four Output PCIe Clock Generator
General Description
The DSC557-05 is a Crystal-less™, four
output PCI express clock generator meeting
Gen1, Gen2, and Gen3 specifications. The
clock generator uses proven silicon MEMS
technology to provide excellent jitter and
stability over a wide range of supply
voltages and temperatures. By eliminating
the external quartz crystal, 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.
DSC557-05 has an Output Enable / Disable
feature allowing it to disable all outputs
when OE1 and OE2 are low. Each output
enable
pin
controls
two
banks
of
synchronous PCIe clocks.
See the OE
function diagram for more detail.
The
device is available in a 20 pin QFN.
Additional output formats are in any
combination of LVPECL, LVDS, and HCSL.
Features
 Meets PCIe Gen1, Gen2 & Gen3 specs
 Available Output Formats:
o
o
HCSL, LVPECL, or LVDS
Mixed Outputs: LVPECL/HCSL/LVDS
 Wide Temperature Range
o
Ext. Industrial: -40° to 105° C
o
Industrial: -40° to 85° C
o
Ext. commercial: -20° to 70° C
 Supply Range of 2.25 to 3.6 V
 Low Power Consumption
o
30% lower than competing devices
 Excellent Shock & Vibration Immunity
o
Qualified to MIL-STD-883
 Available Footprints:
o
20 QFN
 Lead Free & RoHS Compliant
 Short Lead Time: 2 Weeks
Block Diagram
Applications
 Communications/Networking
o
o
o
o
o
*
Clk0+/-, Clk1+/-, Clk2 +/- and Clk3 +/- are
100 MHz as per PCIe standards. For other
frequencies, please contact the factory.
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
o Industrial, Medical, and Avionics
o Security Systems and Office
Automation
o Digital Signage, POS and others
 Consumer Electronics
o Smart TV, Bluray, STB
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DSC557-05
Page 1
DSC557-05
Crystal-less Four Output PCIe Clock Generator
Specifications (Unless specified otherwise: T=25° C, VDD =3.3V)
Parameter
Supply Voltage
1
Condition
VDD
Supply Current
IDD
Supply Current2
(Four HCSL Outputs)
IDD
Frequency Stability
Δf
Startup Time3
Input Logic Levels
Input logic high
Input logic low
tSU
VIH
VIL
Output Disable Time4
Output Enable Time
Min.
Typ.
2.25
EN pin low – outputs are
disabled
EN pin high – outputs are
enabled
RL=50 Ω,
FO1=FO2=FO3= FO4=100 MHz
Includes frequency variations
due to initial tolerance, temp.
and power supply voltage
T=25°C
42
Max.
Unit
3.6
V
46
mA
120
mA
±100
±50
ppm
5
ms
0.25xVDD
V
tDA
5
ns
tEN
20
ns
2
Pull-Up Resistor
0.75xVDD
-
Pull-up on OE pin
40
kΩ
HCSL Outputs6
Parameter
Output Logic Levels
Output logic high
Output logic low
VOH
VOL
Pk to Pk Output Swing
tR
tF
Frequency
5
Period Jitter
Jitter, Phase
(Common Clock
Architecture)
RL=50Ω
0.725
-
Typ.
Max.
Unit
0.1
V
750
mV
20% to 80%
RL=50Ω, CL= 2pF
200
f0
Single Frequency
2.3
SYM
Differential
48
JPER
FO1=FO2= FO3 = FO4 =100 MHz
2.5
TJ
PCIe Gen 1.1
22.7
86.08
psp-p
JRMS-CCHF
PCIe Gen 2.1, 1.5MHz to Nyquist
2.20
3.18
psRMS
0.08
3.0
8
psRMS
8
psRMS
JRMS-CCLF
JRMS-CC
Integrated Phase Noise
(Data Clock
Architecture)
Min.
Single-Ended
Output Transition time4
Rise Time
Fall Time
Output Duty Cycle
Condition
JRMS-DCHF
JRMS-DCLF
JRMS-DC
PCIe Gen 2.1, 10 kHz to 1.5 MHz
1007
400
ps
460
MHz
52
%
psRMS
PCIe Gen 3.0
0.37
1.0
PCIe Gen 2.1, 1.5MHz to Nyquist
2.15
4.08
psRMS
0.06
0.32
8
psRMS
psRMS
PCIe Gen 2.1, 10 kHz to 1.5 MHz
PCIe Gen 3.0
7.5
1.08
Notes:
1. Each VDD pin should be filtered with 0.01uf capacitor.
2. Output is enabled if OE pin is floated or not connected.
3. tsu is time to 100PPM stable output frequency after VDD is applied and outputs are enabled.
4. Output Waveform and Connection Diagram define the parameters.
5. Period Jitter includes crosstalk from adjacent output.
6. Contact [email protected] for alternate output options (LVPECL, LVDS, LVCMOS).
7. Contact [email protected] for alternative frequency options
8. Jitter limits established by Gen 1.1, Gen 2.1, and Gen 3.0 PCIe standards.
_____________________________________________________________________________________________________________________________ _________________
DSC557-05
Page 2
DSC557-05
Crystal-less Four Output PCIe Clock Generator
Absolute Maximum Ratings
Item
Min
Max
Unit
Supply Voltage
-0.3
+4.0
V
Input Voltage
-0.3
VDD+0.3
V
Junction Temp
-
+150
°C
Storage Temp
-55
+150
°C
Soldering Temp
-
+260
°C
ESD
HBM
MM
CDM
-
Condition
40sec max.
V
4000
400
1500
Solder Reflow Profile
Se
3C
/
217°C
200°C
60-150
Sec
S
6C/
ax
cM
3C
/S e
25°C
60-180
Sec
Pre heat
8 min max
Reflow
x.
150°C
Ma
.
ec
Temperature (°C)
cM
ax
.
260°C
20-40
Sec
Cool
Time
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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DSC557-05
Page 3
DSC557-05
Crystal-less Four Output PCIe 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
CLK0CLK0+
CLK1CLK1+
VDD
NC
OE2
NC
VSS
VSS
CLK2CLK2+
CLK3CLK3+
VDD
NC
Pin Type
I
NA
Power
Power
O
O
O
O
Power
NA
I
NA
Power
Power
O
O
O
O
Power
NA
Pin Diagram (20 QFN)
Description
Output Enable; active high
Leave unconnected or grounded
Ground
Ground
Complement output of differential
True output of differential pair
Complement output of differential
True output of differential pair
Power Supply
Leave unconnected or grounded
Output Enable; active high
Leave unconnected or grounded
Ground
Ground
Complement output of differential
True output of differential pair
Complement output of differential
True output of differential pair
Power Supply
Leave unconnected or grounded
pair
pair
pair
pair
Connection Diagram
NC
VDD
CLK3+
CLK3-
CLK2+
CLK2-
(20 QFN Four HCSL Outputs)
20
19
18
17
16
15
OE1
1
14
VSS
VSS
4
11
OE2
CLK0-
5
6
7
8
9
10
NC
NC
VDD
VSS
12
CLK1+
13
3
CLK1-
2
CLK0+
NC
VSS
20 QFN 5.0 x 3.2mm
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DSC557-05
Page 4
DSC557-05
Crystal-less Four Output PCIe Clock Generator
OE Function and Output Waveform: HCSL
tR
tF
CLK+
80%
50%
675mV
20%
CLK-
1/f0
tDA
tEN
VIH
OE
VIL
CLK1/CLK2 Synchronous
OE1
0
0
1
1
OE2
0
1
0
1
CLK0
Hi-Z
Hi-Z
EN
EN
CLK1
Hi-Z
EN
Hi-Z
EN
CLK2
Hi-Z
EN
Hi-Z
EN
CLK3
Hi-Z
Hi-Z
EN
EN
CLK0/CLK3 Synchronous
Ordering Information
DSC557-05 4 4 4 4 K I 0 T
4
T
4
CLK 3 Output Format
1: LVCMOS
4
2: LVPECL
4
3: LVDS
4
4: HCSL
4
CLK 2 Output Format
1: LVCMOS
2: LVPECL
3: LVDS
4: HCSL
CLK 1 Output Format
1: LVCMOS
2: LVPECL
3: LVDS
4: HCSL
Packing
T: Tape & Reel
Stability
0: ±100ppm
1: ±50ppm
Temp Range
E: -20 to 70
I: -40 to 85
L: -40 to 105
Package
K: 20 QFN
CLK 0 Output Format
1: LVCMOS
2: LVPECL
3: LVDS
4: HCSL
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DSC557-05
Page 5
DSC557-05
Crystal-less Four Output PCIe Clock Generator
Package Dimensions
20 QFN, 5.0 x 3.2 mm
Top View
units: mm[inches]
Bottom View
units: mm[inches]±
_____________________________________________________________________________________________________________________________ _________________
DSC557-05
Page 6
DSC557-05
Crystal-less Four Output PCIe Clock Generator
Side View
units: mm[inches]
Recommended Solder Pad Layout
units: mm[inches]
*Connect the center pad to VSS for best thermal performance
Disclaimer:
Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This information
is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry, specifications and
descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted
by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability whatsoever, and Micrel disclaims
any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties relating to fitness for a particular purpose,
merchantability, or infringement of any patent, copyright or other intellectual property right.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can
reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the
body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s use or
sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any
damages resulting from such use or sale.
MICREL, Inc.
Phone: +1 (408) 944-0800
●
●
2180 Fortune Drive,
Fax: +1 (408) 474-1000
San Jose, California
95131
● Email: [email protected]
●
●
USA
www.micrel.com
_____________________________________________________________________________________________________________________________ _________________
DSC557-05
Page 7
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