Features 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 eLLP-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 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 de-emphasis 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. Applications Backplane driver or cable driver Signal repeating, buffering and conditioning applications

Typical Application *click for larger image	Block Diagram click for larger image
Typical Performance *click for larger image

Parameters Values Channels 4 Channels Max Speed 4.25 Gbps OUT SigCon De-E Input Compatibility CML Output Compatibility CML Power Consumption_ 1300 mW PowerWise Rating 4 39 mW/Gbps Special Features Loopback SupplyVoltage 3.3 Volt Temperature Min -40 deg C Temperature Max 85 deg C JTAG1149.1 No Function Buffer PowerWise Yes Total Throughput 33600 Mbps Protocol Gen. Purpose

Datasheets

Title		Size	Date	Other Language
	DS42BR400 Quad 4.25 Gbps CML Transceiver with Transmit De-Emphasis and Receive Equalization	320 Kbytes	2-Mar-09	日本語

Application Notes

Title		Size	Date	Other Language
	AN-1541: Application Note 1541 Driving Signals Over XAUI Backplanes Using DS42MB100, DS40MB200, or DS42BR400	49070 Kbytes	17-Mar-07	中文

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
DS42BR400TSQ/NOPB DS42BR400TSQ RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 514 MOUSER Worldwide 200	$6.45 each at 100+ pcs	reel of 250

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for DS42BR400.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for DS42BR400 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
DS42BR400-EVK	DS42BR400-EVK Evaluation Kit	Preliminary	Distributor Region Qty DIGI-KEY Worldwide 0 MOUSER Worldwide 1	$275.00 each	1

National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

Lead Free product status is available through the search tool located here

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
DS42BR400TSQ/NOPB DS42BR400TSQ	224.792 225.803	LLP	60	3 3	260 260	Detail	Download	N/A	NS UZXYTTE# DS42BR400 TSQ

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for DS42BR400.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for DS42BR400 is located at RoHS Status.

CAD Symbols and Models Download DS42BR400 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
DS42BR400TSQ	BICMOS8	2	15238	132	0	1812500	2	514301823

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for DS42BR400.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for DS42BR400 is located at RoHS Status.

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