DS92LV1021TMSA/NOPB National Semiconductor, DS92LV1021TMSA/NOPB Datasheet - Page 10

• Manufacturer Part Number: DS92LV1021TMSA/NOPB
• Description: IC SERIALIZER 10-BIT 28-SSOP
• Manufacturer: National Semiconductor

Specifications of DS92LV1021TMSA/NOPB

• Function: Serializer
• Data Rate: 400Mbps
• Input Type: LVTTL/LVCMOS
• Output Type: LVDS
• Number Of Inputs: 10
• Number Of Outputs: 1
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-SSOP
• Serdes Function: Serializer
• Ic Output Type: LVDS
• No. Of Inputs: 10
• No. Of Outputs: 1
• Supply Voltage Range: 3V To 3.6V
• Driver Case Style: SSOP
• No. Of Pins: 28
• Filter Terminals: SMD
• Rohs Compliant: Yes
• Data Rate Max: 400Mbps
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: *DS92LV1021TMSA; *DS92LV1021TMSA/NOPB; DS92LV1021TMSA

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Application Information
PCB CONSIDERATIONS
The Bus LVDS devices Serializer and Deserializer should be
placed as close to the edge connector as possible. In mul-
tiple Deserializer applications, the distance from the Deseri-
alizer to the slot connector appears as a stub to the Serial-
izer driving the backplane traces. Longer stubs lower the
impedance of the bus increasing the load on the Serializer
and lowers threshold margin at the Deserializers. Deserial-
izer devices should be placed no more than 1 inch from the
slot connector.
TRANSMISSION MEDIA
The Serializer and Deserializer are designed for data trans-
mission over a multi-drop bus. Multi-drop buses use a single
Serializer and multiple Deserializer devices. Since the Seri-
Pin Diagram
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DS92LV1021AMSA - Serializer
10
alizer can be driving from any point on the bus, the bus must
be terminated at both ends. For example, a 100 Ohm differ-
ential bus must be terminated at each end with 100 Ohms
lowering the DC impedance that the Serializer must drive to
50 Ohms. This load is further lowered by the addition of
multiple Deserializers. Adding up to 20 Deserializers to the
bus (depending upon spacing) will lower the total load to
about 27 Ohms (54 Ohm bus). The Serializer is designed for
DC loads between 27 and 100 Ohms.
The Serializer and Deserializer can also be used in point-to-
point configuration of a backplane, PCB trace or through a
twisted pair cable. In point-to-point configurations the trans-
mission media need only be terminated at the receiver end.
In the point-to-point configuration the potential of offsetting
the ground levels of the Serializer vs. the Deserializer must
be considered. Bus LVDS provides a plus / minus one volt
common mode range at the receiver inputs.
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