PM5381-BI PMC-Sierra, Inc., PM5381-BI Datasheet - Page 550

• Manufacturer Part Number: PM5381-BI
• Description: ATM UNI, Single Channel ATM PHY Interface for 2488.32Mbps
• Manufacturer: PMC-Sierra, Inc.

13.26 Termination Scheme
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-2000489, Issue 4
The S/UNI-2488 is to be AC coupled and double terminated, see Figure 34 to Figure 36 below for
several connects. Note that while the S/UNI-2488 could be DC coupled to a 3.3V CML ODL on
the Tx side, it has not been tested, thus is NOT recommended. Another note is that the
external termination in practice might be integrated in ODL transceiver.
Figure 34 S/UNI-2488 Tx Termination Scheme #1
Figure 35 S/UNI-2488 Tx Termination Scheme #2
16mA or
30.5mA
16mA or
30.5mA
AVDH1=3.3V
AVDH1=3.3V
Rloadint
Rloadint
25W
25W
Open Drain
Open Drain
Structure
Structure
TX2488
TX2488
Rloadint
Rloadint
25W
25W
Rloadext
S/UNI-2488 Telecom Standard Product Datasheet
V
49.9W
BIASODL
100nF
100nF
100nF
100nF
Rloadext
100W
Rloadext
49.9W
Transm itter
Transm itter
ODL
ODL
Released
550