Features DC - 3.125 Gbps low jitter, low skew, low power operation Pin selectable transmit pre-emphasis and receive equalization eliminate data dependant jitter Wide input common mode voltage range allows DC-coupled interface to LVDS, CML and LVPECL drivers ^LOS circuitry detects open inputs fault Integrated 100Ω input and output terminations 8 kV ESD on LVDS I/O pins protects adjoining components Small 6 mm x 6 mm LLP-40 space saving package Description The DS25BR440 is a 3.125 Gbps Quad LVDS buffer optimized for high-speed signal routing and repeating over lossy FR-4 printed circuit board backplanes and balanced cables. Fully differential signal paths ensure exceptional signal integrity and noise immunity. The DS25BR440 features two levels of transmit pre-emphasis (PE) and two levels of receive equalization (EQ). Both of these features compensate for interconnect losses and ultimately maximize noise margin. A loss-of-signal ( ^LOS) circuit monitors each input channel and a unique ^LOS pin is asserted when no signal is detected at that input Wide input common mode range allows the switch to accept signals with LVDS, CML and LVPECL levels; the output levels are LVDS. A very small package footprint requires a minimal space on the board while the flow-through pinout allows easy board layout. Each differential input and output is internally terminated with a 100Ω resistor to lower device return losses, reduce component count and further minimize board space. Applications Clock and data buffering and repeating Copper cable driving and equalization FR-4 equalization OC-48 / STM-16

Typical Application *click for larger image	Block Diagram *click for larger image
Typical Performance *click for larger image Equalization with 20 and 40 inch striplines

Datasheets

Title		Size	Date	Other Language
	DS25BR440 3.125 Gbps Quad LVDS Buffer with Transmit Pre-Emphasis and Receive Equalization	396 Kbytes	17-May-11

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
DS25BR440TSQ/NOPB RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 250 DIGI-KEY Worldwide 885 FARNELL Europe and Asia 38 MOUSER Worldwide 222 NEWARK Americas 335 TAYLOR Americas 250	$4.45 each at 100+ pcs	reel of 250
DS25BR440TSQX/NOPB RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$4.45 each at 100+ pcs	reel of 2500

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 DS25BR440.

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 DS25BR440 is located at RoHS Status.

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
DS25BR440TSQ/NOPB	99.658	LLP	40	3	260	Detail	Download	ibis file	NS UZXYTTE# 2BR440SQ
DS25BR440TSQX/NOPB	99.658	LLP	40	3	260	Detail	Download	ibis file	NS UZXYTTE# 2BR440SQ

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 DS25BR440.

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 DS25BR440 is located at RoHS Status.

CAD Symbols and Models Download DS25BR440 CAD Symbols

Models ibis file

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
DS25BR440TSQ	BICMOS8B+	0	3632	0	0	2762292	2	783807897
DS25BR440TSQX	BICMOS8B+	0	3632	0	0	2762292	2	783807897

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 DS25BR440.

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 DS25BR440 is located at RoHS Status.