PM5380-BI PMC-Sierra, Inc., PM5380-BI Datasheet - Page 409

• Manufacturer Part Number: PM5380-BI
• Description: Network Interface, SATURN User Network Interface (8x155) Telecom Standard Product
• Manufacturer: PMC-Sierra, Inc.

Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC- 2010299, Issue 2
13.17 Clock Synthesis and Recovery
Figure 37 Interfacing S/UNI-8x155 APS PECL Pins to 5.0V Devices
Figure 38 Interfacing S/UNI-8x155 APS PECL Pins to 3.3V Devices
Figure 39 Interfacing S/UNI-8x155 APS PECL Pins to 5.0V ECL Buffer
Please refer to the S/UNI-16x155 reference design (PMC-200-0506) for further
recommendations.
The Clock Synthesizer unit (CSU) in the S/UNI-8x155 requires an external reference clock
REFCLK to generate the 155.52 MHz transmit clock. The REFCLK input is a PECL input in
order to reduce the amount of noise coupled into the CSU. In most cases, the reference clock
must be generated and propagated using PECL logic in order for the CSU to meet SONET/SDH
intrinsic jitter specifications.
APSO+
APSO+
APSO+
APSO-
APSO-
APSO-
49.9W
49.9W
49.9W
49.9W
49.9W
49.9W
0.1uF
0.1uF
0.1uF
19.2W
19.2W
63.4W
+5.0
volts
+5.0 volts
+3.3 volts
S/UNI®-8x155 ASSP Telecom Standard Product Data Sheet
50W Trace Impedance
50W Trace Impedance
50W Trace Impedance
50W Trace Impedance
50W Trace Impedance
50W Trace Impedance
APSI-
APSI-
APSI-
APSI-
APSI+
APSI-
Released
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