SCAN921821 Datasheet, PDF (1/16 Pages) National Semiconductor (TI) – Dual 18-Bit Serializer with Pre-emphasis, IEEE 1149.1(JTAG), and At-Speed BIST

SCAN921821
www.ti.com
SNLS173C – SEPTEMBER 2004 – REVISED APRIL 2013
SCAN921821 Dual 18-Bit Serializer with Pre-emphasis, IEEE 1149.1 (JTAG), and At-Speed
BIST
Check for Samples: SCAN921821
FEATURES
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•2 15-66 MHz Dual 18:1 Serializer with 2.376 Gbps
Total Throughput
• 8-level Selectable Pre-emphasis on Each
Channel Drives Lossy Cables and Backplanes
• >15kV HBM ESD Protection on Bus LVDS I/O
Pins
• Robust BLVDS Serial Data Transmission with
Embedded Clock for Exceptional Noise
Immunity and Low EMI
• Power Saving Control Pin for Each Channel
• IEEE 1149.1 "JTAG" Compliant
• At-Speed BIST - PRBS Generation
• No External Coding Required
• Internal PLL, No External PLL Components
Required
• Single +3.3V Power Supply
• Low Power: 260 mW (typ) Per Channel at 66
MHz with PRBS-15 Pattern
• Single 3.3 V Supply
• Fabricated with Advanced CMOS Process
Technology
• Industrial −40 to +85°C Temperature Range
• Compact 100-ball NFBGA Package
DESCRIPTION
The SCAN921821 is a dual channel 18-bit serializer
featuring 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 embedded 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 channel 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
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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