DS25BR400 Datasheet | National Semiconductor

Description The DS25BR400 is a quad 250 Mbps - 2.5 Gbps CML transceiver, or 8-channel buffer, for use in XAUI Fibre Channel 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 grouped in fours and are enabled through two control pins. These control pins provide customers flexibility in XAUI applications where ISI distortion may vary from one direction to another. All output drivers have four selectable steps of de-emphasis to pensate against transmission loss across long FR4 backplanes. The de-emphasis blocks are also grouped in fours. In addition, the DS25BR400 also has loopback control capability on four channels. All CML drivers and receivers are internally terminated with 50Ω pull-up resistors. Features n Quad 2.5 Gbps Transceiver or 8-Channel CML Serial Buffer n 250 Mbps - 2.5 Gbps Fully Differential Data Paths n Optional Fixed Input Equalization n Selectable Output De-emphasis n Individual Loopback Controls n On-chip Termination n +3.3V supply n Low Power, 1.3 Watts MAX n Lead-less e LLP-60 pin package (9mmx9mmx0.8mm, 0.4mm pitch) n - 40˚C to +85˚C Industrial Temperature Range n 6 k V ESD Rating, HBM Functional Block Diagram © 2006 National Semiconductor Corporation DS201942 .national. Connection Diagram Leadless e LLP-60 Pin Package (9mmx9mmx0.8mm, 0.4mm pitch) Order number DS25BR400TSQ See NS Package Number SQA060 .national. Pin Descriptions Pin Name Pin Number 51 52 48 49 43 42 40 39 33 34 36 37 25 24 28 27 58 57 55 54 6 7 3 4 10 9 13 12 18 19 21 28 60 I/O Description DIFFERENTIAL I/O IB_0+ IB_0- OA_0+ OA_0- IB_1+ IB_1- OA_1+ OA_1- IB_2+ IB_2- OA_2+ OA_2- IB_3+ IB_3- OA_3+ OA_3- IA_0+ IA_0- OB_0+ OB_0- IA_1+ IA_1- OB_1+ OB_1- IA_2+ IA_2- OB_2+ OB_2- IA_3+ IA_3- OB_3+ OB_3- EQA I O I O I O I O I O I O...