PDF SCAN921821 Data sheet ( Hoja de datos )

Número de pieza	SCAN921821
Descripción	Dual 18-Bit Serializer
Fabricantes	National Semiconductor
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No Preview Available ! November 2004 www.DataSheet4U.com SCAN921821 Dual 18-Bit Serializer with Pre-emphasis, IEEE 1149.1 (JTAG), and At-Speed BIST General Description The SCAN921821 is a dual channel 18-bit serializer featur- ing signal conditioning, boundary SCAN, and at-speed BIST. Each serializer block transforms an 18-bit parallel LVCMOS/ LVTTL data bus into a single Bus LVDS data stream with embedded clock. This single serial data stream with embed- ded clock simplifies PCB design and reduces PCB cost by narrowing data paths that in turn reduce PCB size and layers. The single serial data stream also reduces cable size, the number of connectors, and eliminates clock-to-data and data-to-data skew. Each channel also has an 8-level selectable pre-emphasis feature that significantly extends performance over lossy interconnect. Each channel also has its own powerdown pin that saves power by reducing supply current when the chan- nel is not being used. The SCAN921821 also incorporates advanced testability features including IEEE 1149.1 and at-speed BIST PRBS pattern generation to facilitate verification of board and link integrity Features n 15-66 MHz Dual 18:1 Serializer with 2.376 Gbps total throughput n 8-level selectable pre-emphasis on each channel drives lossy cables and backplanes n >15kV HBM ESD protection on Bus LVDS I/O pins n Robust BLVDS serial data transmission with embedded clock for exceptional noise immunity and low EMI n Power saving control pin for each channel n IEEE 1149.1 "JTAG" Compliant n At-Speed BIST - PRBS generation n No external coding required n Internal PLL, no external PLL components required n Single +3.3V power supply n Low power: 260 mW (typ) per channel at 66 MHz with PRBS-15 pattern n Single 3.3 V supply n Fabricated with advanced CMOS process technology n Industrial −40 to +85˚C temperature range n Compact 100-ball FBGA package Block Diagram © 2004 National Semiconductor Corporation DS200844 20084401 www.national.com 1 page AC Timing Diagrams and Test Circuits www.DataSheet4U.com 20084403 FIGURE 1. “Worst Case” Serializer IDD Test Pattern 20084405 FIGURE 2. Serializer Bus LVDS Distributed Output Load and Transition Times 20084407 FIGURE 3. Serializer Input Clock Transition Time 20084408 FIGURE 4. Serializer Setup/Hold Times 5 www.national.com 5 Page Physical Dimensions inches (millimeters) unless otherwise noted www.DataSheet4U.com Dimensions shown in millimeters only Order Number SCAN921821TSM NS Package Number SLC100A National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. For the most current product information visit us at www.national.com. LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. BANNED SUBSTANCE COMPLIANCE National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. National Semiconductor Americas Customer Support Center Email: [email protected] Tel: 1-800-272-9959 www.national.com National Semiconductor Europe Customer Support Center Fax: +49 (0) 180-530 85 86 Email: [email protected] Deutsch Tel: +49 (0) 69 9508 6208 English Tel: +44 (0) 870 24 0 2171 Français Tel: +33 (0) 1 41 91 8790 National Semiconductor Asia Pacific Customer Support Center Email: [email protected] National Semiconductor Japan Customer Support Center Fax: 81-3-5639-7507 Email: [email protected] Tel: 81-3-5639-7560 11 Page

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