Features 5-bit DDR LVDS parallel data interface Programmable transmit de-emphasis Configurable output levels (VOD) Selectable DC-balanced encoder Selectable data scrambler Remote Sense for automatic detection and negotiation of link status On chip LC VCOs Redundant serial output (ELX device only) Data valid signaling to assist with synchronization of multiple receivers Supports AC- and DC-coupled signaling Integrated CML and LVDS terminations Configurable PLL loop bandwidth Programmable output termination (50Ω or 75Ω). Built-in test pattern generator Loss of lock and error reporting Configurable via SMBus 48-pin LLP package with exposed DAP Description The DS32EL0421/ DS32ELX0421 is a 125 MHz to 312.5 MHz (DDR) serializer for high-speed serial transmission over FR-4 printed circuit board backplanes, balanced cables, and optical fiber. This easy-to-use chipset integrates advanced signal and clock conditioning functions, with an FPGA friendly interface. The DS32EL0421/DS32ELX0421 serializes up to 5 parallel input LVDS channels to create a maximum data payload of 3.125 Gbps. If the integrated DC-balance encoding is enabled, the maximum data payload achievable is 2.5 Gbps. The DS32EL0421/DS32ELX0421 serializers feature remote sense capability to automatically detect and negotiate link status with its companion DS32EL0124/DS32ELX0124 deserializers without requiring an additional feedback path. The parallel LVDS interface reduces FPGA I/O pins, board trace count and alleviates EMI issues, when compared to traditional single-ended wide bus interfaces. The DS32EL0421/DS32ELX0421 is programmable through a SMBus interface as well as through control pins. Key Specification 1.25 to 3.125 Gbps serial data rate 125 to 312.5 MHz DDR parallel clock -40° to +85°C temperature range >8 kV ESD (HBM) protection Low Intrinsic Jitter — 35ps at 3.125 Gbps

Also Recommended DS32ELX0124▲ Matching 3.125 Gbps DeSerializer With 5-bit DDR LVDS Interface Fig 1 Typ App Diagram

Typical Application click for larger image Fig 1 Typ App Diagram	Connection Diagram click for larger image EL Pin Diagram
Typical Performance click for larger image Typ Perf 1.25G_Differential

Datasheets

Title		Size	Date	Other Language
	DS32ELX0421 125 – 312.5 MHz FPGA-Link Serializer with DDR LVDS Parallel Interface	1304 Kbytes	20-Oct-10

Application Notes

Title		Size	Date	Other Language
	AN-1979: Application Note 1979 LVDS Timing DS32ELX0421 and DS32ELX0124 Serializers and Deserializers	146 Kbytes	2-Jul-09	日本語
	AN-1887: Application Note 1887 Expanding the Payload with National’s FPGA-Link DS32ELX0421 and DS32ELX0124 Serializer and Deserializer	122 Kbytes	12-Sep-08

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
DS32ELX0421SQ/NOPB RoHS Status	LLP	Full production Lead Time: 22 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$10.60 each at 1K+ pcs	reel of 1000
DS32ELX0421SQE/NOPB RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 250 DIGI-KEY Worldwide 1883 MOUSER Worldwide 250 TAYLOR Americas 250	$10.60 each at 1K+ pcs	reel of 250
DS32ELX0421SQX/NOPB RoHS Status	LLP	Full production Lead Time: 22 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$10.60 each at 1K+ 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 DS32ELX0421.

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 DS32ELX0421 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
DS32ELX0421SQ/NOPB	123.191	LLP	48	3	260	Detail	Download	ibis file	NS UZXYTTE# 32ELX0421
DS32ELX0421SQE/NOPB	123.191	LLP	48	3	260	Detail	Download	ibis file	NS UZXYTTE# 32ELX0421
DS32ELX0421SQX/NOPB	123.191	LLP	48	3	260	Detail	Download	ibis file	NS UZXYTTE# 32ELX0421

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 DS32ELX0421.

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 DS32ELX0421 is located at RoHS Status.

Design Tools

Title	Size	Date
Interfacing National's FPGA-Link Ser/Des with Altera Cyclone III FPGAs
Avnet DS32ELX0421/0124 EXP SerDes Rapid Development Module/Board for Xilinx Spartan?-3 FPGAs

CAD Symbols and Models Download DS32ELX0421 CAD Symbols

Models ibis file

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
DS32ELX0421SQ	BICMOS8B+	0	3632	0	0	2762292	2	783807897
DS32ELX0421SQE	BICMOS8B+	0	3632	0	0	2762292	2	783807897
DS32ELX0421SQX	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 DS32ELX0421.

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 DS32ELX0421 is located at RoHS Status.