SCAN928028 Datasheet, PDF (1/18 Pages) National Semiconductor (TI) – 8 Channel 10:1 Serializer with IEEE 1149.1 and At-Speed BIST

September 2003
SCAN928028
8 Channel 10:1 Serializer with IEEE 1149.1 and At-Speed
BIST
General Description
The SCAN928028 integrates eight serializer devices into a
single chip. The SCAN928028 can simultaneously serialize
up to eight 10-bit data streams. The 10-bit parallel inputs are
LVTTL signal levels. The serialized outputs are LVDS signals
with extra drive current for point-to-point and lightly loaded
multidrop applications. Each serializer block in the
SCAN928028 operates independently by using strobes from
a single shared PLL.
The SCAN928028 uses a single +3.3V power supply with a
typical power dissipation of 740mW (3.3V / PRBS / 66 MHz).
Each serializer channel has a unique power down control to
further conserve power consumption.
For high-speed LVDS serial data transmission, line quality is
essential, thus the SCAN928028 includes an @SPEED
TEST function. Each Serializer channel has the ability to
internally generate a PRBS data pattern. This pattern is
received by specific deserializers (SCAN921224) which
have the complement PRBS verification circuit. The deseri-
alizer checks the data pattern for bit errors and reports any
errors on the test verification pins on the deserializer.
For additional information - please see the Applications
Information section in this datasheet.
Features
n IEEE 1149.1 (JTAG) Compliant and At-Speed BIST test
mode.
n All 8 channels synchronous to one parallel clock rate,
from 25 to 66 MHz
n Duplicates function of multiple DS92LV1021 and ’1023
10-bit Serializer devices
n Serializes from one to eight 10-bit parallel inputs into
data streams with embedded clock
n Eight 5 mA modified Bus LVDS outputs that are capable
to drive double terminations
n @Speed Test - PRBS generation to check LVDS
transmission path to SCAN921224, SCAN921226,
SCAN921260, or SCAN926260
n On chip filtering for PLL
n 740mW typ power dissipation (loaded, PRBS, 66MHz,
3.3V)
n High impedance inputs and outputs on power off
n Single power supply at +3.3V (+/-10%)
n 196-pin LBGA package
n Industrial temperature range operation: -40 to +85˚C
Block Diagram
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