ST3293BDR ,RS-422 HIGH SPEED TRANSCEIVER WITH DIGITAL EMPHASISfeatures driver output short circuit current limitinghigh data rate by reducing inter symbolicand a ..
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ST3293BDR
RS-422 HIGH SPEED TRANSCEIVER WITH DIGITAL EMPHASIS
1/11January 2003 FULL DUPLEX COMMUNICATIONS DEVICE
RS-422 PROGRAMMABLE EMPHASIS INCREASES
THEDISTANCE AND DATARATE HIGH SPEED: DATA RATE UP TO 25Mbps -7V TO 7V COMON-MODE INPUT VOLTAGE
RANGE LVTTL LOGIC INPUT THRESHOLDS
DESCRIPTIONThe ST3293isa high-speed RS-422 transceiver
with an emphasis circuitry on the driver which
allows reliable long distance communicationat
high data rate by reducing inter symbolic
interference. The differential amplitude of the
ST3293 is digitally programmable in7 steps
through3 control pins. The emphasis reduces the
inter symbolic interference by increasing the
signal amplitude under the micro control and
counteracting the effectsof the cable with the
varying data stream. The ST3293isa full duplex
device that operates froma single +5V supply.It
features driver output short circuit current limiting
andan open circuit fail-safe receiver input. The PE
input canbe usedasan emphasis enable. The PE
held LOW disable the emphasis instead setto
HIGH enable the emphasis with the configuration C0, C1 and C2 whenDI change logic level. The input can direct drive the outputs witha fixed
emphasisor without emphasis as shownin the
timing diagram.
ORDERING CODES
ST3293RS-422 HIGH SPEED TRANSCEIVER
WITH DIGITAL EMPHASIS
ST32932/11
PIN CONFIGURATION
PIN DESCRIPTION
TRUTH TABLE
TRANSMITTING INPUTS Don’t Care; Z=High Impedance
ST32933/11
EMPHASIS CONTROL INPUT
ABSOLUTE MAXIMUM RATINGSAbsoluteMaximum Ratingsare those values beyond which damagetothe device mayoccur.Functional operation under these conditionsis
not implied.
RECOMMENDED OPERATING CONDITIONS
ST32934/11
DRIVER ELECTRICAL CHARACTERISTICSCC= 5V± 5%, -40°C
RECEIVER DC ELECTRICAL CHARACTERISTICS
(VCC= 5V± 5%, -40°C< TA< 85°C, unless otherwise noted. Typical values are referredtoTa= 25°C)
ST3293
5/11
SWITCHING CHARACTERISTICS
(VCC= 5V± 5%, -40°CST3293
6/11
LOGIC DIAGRAM
Figure1: Test Circuit
