CLINK3V48BT-133 National Semiconductor, CLINK3V48BT-133 Datasheet - Page 2

• Manufacturer Part Number: CLINK3V48BT-133
• Description: BOARD EVAL FOR DS90CR485, 486
• Manufacturer: National Semiconductor

Specifications of CLINK3V48BT-133

• Main Purpose: Interface, SerDes (Serializer / De-Serializer)
• Embedded: No
• Utilized Ic / Part: DS90CR485, DS90CR486
• Primary Attributes: Serializes 48 LVCMOS/LVTTL to 8 LVDS, 66 ~ 133 MHz
• Secondary Attributes: Transmits over 2 Meter 3M MDR LVDS Cable
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Introduction
National Semiconductor’s DS90CR2xx and DS90CR4xx
Channel Link serializers/deserializers (SerDes) are
among the easiest to use SerDes in the market. Unlike
most SerDes, Channel Link serialize wide buses, require
no synchronization training characters or patterns, re-
quire no clock source at the receiver end. Channel Link
SerDes have the lowest cost per gigabit and are among
the lowest power SerDes chipsets in the industry.
Channel Link Operation
Channel Link SerDes are normally used as “virtual
ribbon cable” to serialize wide “data+address+control”
parallel buses such as PCI, UTOPIA, processor buses,
and control buses, etc. Instead of tackling the whole
bus with one multiplexer, the parallel clock SerDes
architecture employs a bank of 7-to-1 multiplexers, each
serializing its section of the bus separately. The result-
ing serial data streams travel to the receiver in parallel
with an additional clock signal pair that the receiver
uses to latch in and recover the data. This multi-channel
mux with parallel framing clock approach allows Chan-
nel Link to serialize very wide parallel buses up to 48
bits automatically without external system intervention
or alignment procedures.
Channel Link SerDes deliver benefits over non-serializa-
tion such as fewer wires (especially grounds), lower
power, longer cable driving capability, lower noise/EMI,
and lower cable/connector costs. Not being confined to
using one serial pair, Channel Link SerDes can be made
arbitrarily wide and also avoid the design issues associ-
ated with ultra high speed serial data rates. Channel
Link offers excellent price/performance and is often the
only practical way to transmit a traditional wide parallel
bus over several meters of cable. Channel Link SerDes
chipsets are available in 21-, 28-, and 48- bit parallel
bus widths.
2
Channel Link LVDS SerDes
“Virtual Ribbon Cable”