1FEATURES

2• 250 Mbps – 4.25 Gbps Fully Differential Data

Paths

• Optional Fixed Input Equalization

• Selectable Output De-emphasis

• Individual Loopback Controls

• On-Chip Termination

• Lead-less WQFN-60 Pin Package (9 mm x 9

mm x 0.8 mm, 0.5 mm Pitch)

• −40°C to +85°C Industrial Temperature Range

• 6 kV ESD Rating, HBM

APPLICATIONS

• Backplane Driver or Cable Driver

• Signal Repeating, Buffering and Conditioning

Applications

DESCRIPTION

The DS42BR400 is a quad 250 Mbps – 4.25 Gbps

CML transceiver, or 8-channel buffer, for use in

backplane and cable applications. With operation

down to 250 Mbps, the DS42BR400 can be used in

applications requiring both low and high frequency

data rates. Each input stage has a fixed equalizer to

reduce ISI distortion from board traces. The

equalizers are grouped in fours and are enabled

through two control pins. These control pins provide

customers flexibility where ISI distortion may vary

from one direction to another.

All output drivers have four selectable steps of deemphasis

to compensate against transmission loss

across long FR4 backplanes. The de-emphasis

blocks are also grouped in fours. In addition, the

DS42BR400 also has loopback control capability on

four channels. All CML drivers have 50Ω termination

to VCC. All receivers are internally terminated with

differential 100Ω.