1FEATURES

2• 250 Mbps – 2.5 Gbps Low Jitter Operation

• Optional Fixed Input Equalization

• Selectable Output De-Emphasis

• Individual Loopback Controls

• On-Chip Termination

• +3.3V Supply

• Lead-Less WQFN-60 Pin Package

– (9 mm x9 mm x0.8 mm, 0.5 mm Pitch)

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

• 6 kV ESD Rating, HBM

APPLICATIONS

• Backplane or Cable Driver

• Signal Buffering and Repeating

DESCRIPTION

The DS25BR400 is a quad 250 Mbps – 2.5 Gbps

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

backplane and cable applications. With operation

down to 250 Mbps, the DS25BR400 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 enabled through two control pins.

These control pins provide flexibility in applications

where ISI distortion may vary from one direction to

another. All output drivers have four selectable steps

of de-emphasis to compensate for transmission loss.

The de-emphasis blocks are also grouped in fours. In

addition, the DS25BR400 also has loopback control

capability on four channels. All the CML drivers have

50Ω termination to VCC. All receivers are internally

terminated with differential 100Ω.