78P2351R-IM TERIDIAN [Teridian Semiconductor Corporation], 78P2351R-IM Datasheet - Page 21

• Manufacturer Part Number: 78P2351R-IM
• Description: Serial 155M NRZ to CMI Converter
• Manufacturer: TERIDIAN [Teridian Semiconductor Corporation]

Page: 21 of 31
PARAMETER
Peak-to-peak Output Voltage
(Fuse-trimmed to nominal target at
final test)
Rise/ Fall Time
Transition Timing Tolerance
PARAMETER
Output Impedance
Return Loss
ELECTRICAL SPECIFICATIONS
TRANSMITTER SPECIFICATIONS FOR CMI INTERFACE
Bit Rate: 155.52Mbits/s ± 20ppm
Code: Coded Mark Inversion (CMI)
Relevant Specification: ITU-T G.703, Telcordia GR-253, ANSI T1.102
With the coaxial output port driving a 75Ω load, the output pulses conform to the templates in Figures 8 and 9.
These specifications are tested during production test. Consult application note for reference schematic, layout
guidelines, and recommended transformers.
The following specifications are not tested during production test. They are included for information only.
Note that the return loss depends on the board layout and the particular transformer used.
CONDITION
Template, steady state
10-90%
Negative Transitions
Positive Transitions at Interval
Boundaries
Positive Transitions at mid-
interval
CONDITION
Driver is open drain
7MHz to 240MHz

2006 Teridian Semiconductor Corporation
(continued)
-0.35
MIN
MIN
-0.1
-0.5
0.9
15
NRZ to CMI Converter
NOM
NOM
1.04
1
8
MAX
MAX
0.35
1.1
0.1
0.5
Serial 155M
2
78P2351R
UNIT
UNIT
Rev. 2.1
MΩ
dB
pF
ns
ns
V