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VSC8221 Datasheet(PDF) 117 Page - Microsemi Corporation

Part # VSC8221
Description  Single Port 10/100/1000BASE-T PHY with1.25 Gbps SerDes for SFPs/GBICs
PDF  138 Pages
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Manufacturer  MICROSEMI [Microsemi Corporation]
Direct Link  http://www.microsemi.com
Logo MICROSEMI - Microsemi Corporation

VSC8221 Datasheet(HTML) 117 Page - Microsemi Corporation

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VSC8221
Data Sheet
VMDS-10106 Revision 4.1
December 2006
117 of 123
123
27 SERDES SPECIFICATIONS
All specifications valid for TAmbient = 0°C to 70°C.
Table 52. SerDes Specifications
Symbol
Min
Typ
Max
Unit
Parameter Description & Conditions
T_lock
500
uS
Frequency Lock Time
Vidiff
100
2400
mV
Peak to peak differential voltage (TDP-TDN)
terminated with a 100
Ω (differential) Load
Vodiff1
1 Vodiff is controlled by Extended Mii Register 17E.4:2. The default output swing is 1200mV. For more information, see <HyperLink>Section 23.3.2 on page 98.
350
1200
1400
mV
Peak to peak differential voltage (RDP-RDN),
100
Ω (differential) termination in the module,
recommended voltage range is 500 mV to
1200 mV
Vicm
0.437 x VDD12 .45 x VDD12 0.464 x VDD12
V
input common mode voltage
Vocm
0.4 x VDD12
.45 x VDD12
0.5 x VDD12
V
Output common mode voltage
Tr_HS / Tf_HS
300
ps
20%-80% Transition time.
Trise / Tfall of high speed output driver.
RJ
18
ps RMS
Random jitter (1 sigma) as per 802.3 standard.
random jitter component at RDP, RDN in serial
MAC to CAT5 media category of PHY operating
modes.
DJ
38
ps pk-pk
With a K28.5+/K28.5- Pattern.
Deterministic jitter at RDP, RDN in serial MAC to
CAT5 media category of PHY operating modes.
SerDes
Data Rate
1249.375
1250
1250.625
Mbps
SerDes data rate. (+/- 500 ppm)



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