NOT RECOMMENDED FOR NEW DESIGNS
Micrel
ULTRA PRECISION 8:1 MUX WITH
INTERNAL TERMINATION AND 1:2
400mV LVPECL FANOUT BUFFER
Precision Edge™
SY58039U
Precision Edge™
SY58039U
FEATURES
- Selects between 1 of 8 inputs, and provides 2
precision, low skew LVPECL output copies
- Ultra-low jitter design:
• 80fsrms phase jitter (typ)
- Guaranteed AC performance over temperature and
voltage:
• DC to 5Gbps throughput
• 100mV)
• 100mV
(SEL-to-Q)
Δtpd Tempco
Output-to-Output Skew
Part-to-Part Skew
Max
GHz
500
ps
600
ps
220
fs/°C
Note 9
15
ps
Note 10
150
ps
tJITTER
RMS Phase Jitter
Output = 622MHz
Integration Range: 12kHz - 20MHz
tr, tf
Output Rise/Fall Time
At full output swing, 20% to 80%.
80
25
60
fsrms
85
Notes:
8. High-frequency AC-parameters are guaranteed by design and characterization.
9. Output-to-output skew is measured between two different outputs under identical input transitions.
10. Part-to-part skew is defined for two parts with identical power supply voltages at the same temperature and with no skew of the edges at the
respective inputs.
PHASE NOISE
Noise Power (dBc/Hz)
RMS PHase Jitter (Random)
12kHz to 20MHz = 80fs (Typical)
OFFSET FREQUENCY (Hz)
Phase Noise Plot: 622MHz @ 3.3V
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Units
Gbps
150
Differential Propagation Delay
Temperature Coefficient
tSKEW
Typ
6
ps
Precision Edge™
SY58039U
Micrel
SINGLE-ENDED AND DIFFERENTIAL SWINGS
VDIFF_IN,
VDIFF_OUT 800mV (Typ.)
VIN,
VOUT 400mV (Typ.)
Figure 1a. Single-Ended Voltage Swing
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Figure 1b. Differential Voltage Swing
7
Precision Edge™
SY58039U
Micrel
TYPICAL OPERATING CHARACTERISTICS
VCC = 3.3V, GND = 0, VIN = 100mV, TA = 25°C, unless otherwise stated.
300
200
100
1000 2000 3000 4000 5000
FREQUENCY (MHz)
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Within Device Skew
vs. Temperature
350
PROPAGATION DELAY (ps)
400
0
0
1.2
WITHIN DEVICE SKEW (ps)
OUTPUT AMPLITUDE (mV)
500
Output Amplitude
vs. Frequency
1.0
0.8
0.6
0.4
0.2
0
-40 -20
0
20
40
60
80 100
TEMPERATURE (°C)
8
Propagation Delay
vs. Temperature
345
340
335
330
325
320
315
-40 -20
0
20
40
60
80 100
TEMPERATURE (°C)
Precision Edge™
SY58039U
Micrel
FUNCTIONAL CHARACTERISTICS
VCC = 3.3V, GND = 0, VIN = 100mV, TA = 25°C, unless otherwise stated.
1.25Gbps Output (Q – /Q)
Output Swing
(200mV/div.)
Output Swing
(200mV/div.)
2.5Gbps Output (Q – /Q)
TIME (100ps/div.)
3.2Gbps Output (Q – /Q)
5Gbps Output (Q – /Q)
Output Swing
(200mV/div.)
Output Swing
(200mV/div.)
TIME (200ps/div.)
TIME (50ps/div.)
200MHz Output
1.25GHz Output
Output Swing
(100mV/div.)
Output Swing
(100mV/div.)
TIME (75ps/div.)
TIME (100ps/div.)
TIME (600ps/div.)
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Precision Edge™
SY58039U
Micrel
FUNCTIONAL CHARACTERISTICS (CONTINUED)
5GHz Output
Output Swing
(100mV/div.)
Output Swing
(100mV/div.)
2.5GHz Output
TIME (30ps/div.)
TIME (50ps/div.)
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Precision Edge™
SY58039U
Micrel
INPUT AND OUTPUT STAGES
VCC
VCC
IN
50Ω
VT
50Ω
GND
/Q
/IN
Q
Figure 2a. Simplified Differential Input Stage
Figure 2b. Simplified LVPECL Output Stage
INPUT INTERFACE APPLICATIONS
VCC
VCC
VCC
IN
IN
LVPECL
VCC
GND
VT
NC
Rpd
SY58039U
VCC
GND
VT
VREF-AC
GND
For VCC = 3.3V, Rpd = 50Ω.
For VCC = 2.5V, Rpd = 19Ω.
Figure 3a. LVPECL
Interface (DC-Coupled)
/IN
SY58039U
Rpd
VREF-AC
Rpd
CML
/IN
SY58039U
0.01μF
IN
LVPECL
/IN
0.01μF
For 3.3V, Rpd = 100Ω.
For 2.5V, Rpd = 50Ω.
Figure 3b. LVPECL
Interface (AC-Coupled)
VCC
VCC
IN
CML
IN
/IN
SY58039U
GND
VCC
LVDS
/IN
SY58039U
VT
VREF-AC
0.01μF
Figure 3d. CML
Interface (AC-Coupled)
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GND
NC
VT
NC
VREF-AC
Figure 3e. LVDS Interface
11
GND
NC
VT
NC
VREF-AC
Option: May connect VT to VCC.
Figure 3c. CML
Interface (DC-Coupled)
Precision Edge™
SY58039U
Micrel
OUTPUT INTERFACE APPLICATIONS
+3.3V
+3.3V
ZO = 50Ω
R1
130Ω
+3.3V
R1
130Ω +3.3V
+3.3V
Zo = 50Ω
Zo = 50Ω
ZO = 50Ω
VCC
R2
82Ω
R2
82Ω
50Ω
C1
0.01μF
(optional)
Figure 4a. Parallel Thevenin-Equivalent
Termination
50Ω
Rb
Figure 4b. Parallel Termination
(3-Resistor)
Note:
Note:
For +2.5V system, R1 = 250ohms, R2 = 62.5ohms.
For +2.5V system, Rb =19ohms.
For +3.3V system, Rb = 50ohms.
RELATED MICREL PRODUCTS AND SUPPORT DOCUMENTATION
Part Number
Function
Data Sheet Link
SY58037U
Ultra Precision 8:1 MUX with Internal Termination
and 1:2 CML Fanout Buffer
http://www.micrel.com/product-info/products/sy58037u.shtml
SY58038U
Ultra Precision 8:1 MUX with Internal Termination
and 1:2 LVPECL Fanout Buffer
http://www.micrel.com/product-info/products/sy58038u.shtml
SY58039U
Ultra Precision 8:1 MUX with Internal Termination
and 1:2 400mV LVPECL Fanout Buffer
http://www.micrel.com/product-info/products/sy58039u.shtml
MLF™ Application Note
www.amkor.com/products/notes_papers/MLF_AppNote_0902.pdf
New Products and Applications
www.micrel.com/product-info/products/solutions.shtml
HBW Solutions
M9999-102711
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12
Precision Edge™
SY58039U
Micrel
44 LEAD QFN (QFN-44)
Package
EP- Exposed Pad
Die
CompSide Island
Heat Dissipation
Heat Dissipation
Heavy Copper Plane
Heavy Copper Plane
VEE
VEE
PCB Thermal Consideration for 44-Pin QFN Package
(Always solder, or equivalent, the exposed pad to the PCB)
Package Notes:
1. Package meets Level 2 qualification.
2. All parts are dry-packaged before shipment.
3. Exposed pads must be soldered to a ground for proper thermal management.
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com
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.
© 2005 Micrel, Incorporated.
M9999-102711
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