TXC-06412BIOG Transwitch Corporation, TXC-06412BIOG Datasheet - Page 58

• Manufacturer Part Number: TXC-06412BIOG
• Manufacturer: Transwitch Corporation

Specifications of TXC-06412BIOG

• Lead Free Status / RoHS Status: Not Compliant

PHAST-12P Device
DATA SHEET
TXC-06412B
PRELIMINARY TXC-06412B-MB, Ed. 2
June 2005
7.5 LVPECL I/O RECOMMENDATIONS:
LVPECL - Line Interfaces:
It is required to provide a pull-up and a pull-down resistor as close as possible to the
LINERXDATAxP and LINERXDATAxN (x = 1...4) pins on the PHAST-12P:
It is required to provide a pull-up and a pull-down resistor at the LINETXDATAxP and
LINETXDATAxN (x = 1...4) pins on the PHAST-12P:
The placement of these resistors should be near the PHAST-12P in AC coupled mode and
near the optical tranciever in DC coupled mode.
Provide optional 0.1 F series capacitors on all P and N lines between the PHAST-12P and
each optical transceiver. This allows for both AC- and DC-coupling: 0
mounted in case of DC coupling.
At the optical transceiver side, one should carefully follow the recommendations in the data
sheet of the optical transceiver. This should satisfy most vendors’ data sheets:
LVPECL - Tx Reference Clock:
It is required to provide a pull-up and a pull-down resistor as close as possible to the
REFTXCLK2P & REFTXCLK2N pins on the PHAST-12P:
One should follow the recommendations in the data sheet of the oscillator.
To achieve optimal jitter performance, it is recommended to connect a differential oscillator to
REFTXCLK2P/N (LVPECL), instead of a single-ended to REFTXCLK1 (LVTTL).
• pull-up value (towards +3.3V) = 130
• pull-down value (towards VSS) = 82
• pull-up value (towards +3.3V) = 130
• pull-down value (towards VSS) = 82
• Provide pull-up and pull-down resistors as close as possible to the optical transceiver’s
• Provide pull-up and pull-down resistors as close as possible to the optical transceiver’s
• Provide a resistor between P and N as close as possible to the optical transceiver’s Tx
• Provide enough resistors in the schematic. Some of them may not be required, and can
• pull-up value (towards +3.3V) = 130
• pull-down value (towards VSS) = 82
• Typically, pull-down resistors of approx. 150
• Provide enough resistors in the schematic. Some of them may not be required, and can
Rx output, on both P and N (Usually, only pull-down resistors are required).
Tx input, on both P and N.
input.
be treated as ‘do not install’.
oscillator outputs.
be treated as ‘do not install’.
-
Selected Parameter Values
-
on both P and N are required, close to the
resistors can be
5 8 o f 2 26