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ST75285CTR
MULTIPLE RS-232 DRIVERS AND RECEIVERS
1/13December 2002 MEETS AND EXCEEDS THE
REQUIREMENTSOF EIA/TIA-232-E AND
ITUV.28 STANDARD SINGLE CHIP WITH EASY INTERFACE
BETWEEN UART AND SERIAL PORT
CONNECTOROF IBM PC/ATTM AND
COMPATIBLES DESIGNEDTO SUPPORT DATA RATESUP 120 Kbps
DESCRIPTIONThe ST75285 contains six drivers and ten
receivers. The pinout matches the DB9S
connector designin orderto decrease the part
count, reducethe board space required and allow
easy interconnectionofthe UART and serial port
connectorof IBM PC/ATTM and compatibles. The
bipolar circuits and processingof the ST75285
providesa rugged low-cost solution for this
functionatthe expenseof quiescent power and
external passive components relativeto the
ST75C185.
The ST75285 complies withthe requirementsof
the EIA/TIA 232-E and ITU (formally CCITT) v.28
standards. These standards are for data
interchange betweena host computer and
peripheralat signalling ratesupto 20k-bits/s. The
switching speedsofthe ST75285are fast enough support ratesupto 120K-bits/s with lower
capacitive loads (shorter cables). Interoperabilitythe higher signalling rates cannotbe assured
unless the designer has design controlof the
cable andthe interface circuitsatthe both ends.
For interoperabilityat signalling ratesto 120
K-bits/s, useof EIA/ITA-423-B (ITU v.10) and EIA/
ITA-422-B (ITU v.11) standards are
recommended.It allows space saving in
applications wheretwo ST75185are needed.
ORDERING CODES
ST75285MULTIPLE RS-232 DRIVERS AND RECEIVERS
ST752852/13
PIN DESCRIPTION
ST752853/13
PIN CONNECTION IEC LOGIC SYMBOL AND LOGIC DIAGRAM
ABSOLUTE MAXIMUM RATINGS OVER OPERATING FREE-AIR TEMPERATURE RANGEAbsoluteMaximum Ratingsare those values beyond which damagetothe devicemay occur. Functional operation under these conditionis
not implied.
NOTE1:All voltagearewith respecttothe network ground terminal.
DISSIPATION RATING TABLE(*)Thisisthe reverseofthe traditional junction-case thermal resistance RtJ-C
ST752854/13
RECOMMENDED OPERATING CONDITIONS
SUPPLY CURRENTS
DRIVER ELECTRICAL CHARACTERISTICS OVER OPERATING FREE-AIR TEMPERATURE
RANGE (VDD =9V, VSS =-9V, VCC=5V, unless otherwise specified)
NOTE3:The algebraic convention, wherethemorepositive (lessnegative) limits designatedas maximum, isusedinthis datasheetforlogic
levelsonly(e.g.if-10Visa maximum,the typical valueisa more negative voltage).
NOTE4: Output short circuit conditions must maintainthetotal power dissipation below absolute maximum ratings.
NOTE5:Test conditionsare those specifiedby EIA-232-Eandas listed above.
ST752855/13
DRIVER SWITCHING CHARACTERISTICS(VDD= 12V,VSS= -12V,VCC =5V,TA =25°C)
NOTE6: Measured between-3Vand3V pointsof output waveform (EIA-232-E conditions),all unused inputsaretied.
RECEIVER ELECTRICAL CHARACTERISTICS OVER OPERATING CONDITIONSAll typical valuesareatTA= 25°C,VCC=5V,VDD=9Vand VSS=-9V
RECEIVER SWITCHING CHARACTERISTICS (VDD =12V, VSS =-12V, VCC =5VTA= 25°C)
ST752856/13
Figure1: Driver Test Circuitfor VOH,ISO(H) and ISO(L)
Figure2: Driver Test CircuitforIIH andIIL
Figure3: Driver Test Circuit
ST752857/13
Figure4: Driver Voltage Waveforms
Figure5: Receiver Test CircuitforIOS
Figure6: Receiver Test Circuitfor VT,VOH,VOL
