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ST3243BSTN/a240avai3 TO 5.5V 400KBPS, RS-232 TRANSCEIVER WITH AUTO-POWERDOWN
ST3243CSTN/a1333avai3 TO 5.5V 400KBPS, RS-232 TRANSCEIVER WITH AUTO-POWERDOWN


ST3243C ,3 TO 5.5V 400KBPS, RS-232 TRANSCEIVER WITH AUTO-POWERDOWNST32433 TO 5.5V, 400KBPS, RS-232TRANSCEIVER WITH AUTO-POWERDOWN

ST3243B-ST3243C
3 TO 5.5V 400KBPS, RS-232 TRANSCEIVER WITH AUTO-POWERDOWN
1/14January 2004 1μA SUPPLY CURRENT ACHIEVED WHEN AUTO-POWERDOWN 250Kbps MINIMUM GUARANTEED DATA
RATE GUARANTEED 6V/μsSLEW RATERANGE GUARANTEED MOUSE DRIVEABILITY 0.1μF EXTERNAL CAPACITORS MEET EIA/TIA-232 SPECIFICATIONS DOWN 3V AVAILABLEIN SO-28, SSOP-28 AND
TSSOP28
DESCRIPTION

TheST3243deviceconsists of 3drivers,5
receivers anda dual charge-pump circuit. The
device meets the requirementsof EIA/TIA and
V.28/V.24 communication standards providing
high data rate capability.
The receiver R2is always activeto implementa
wake-up featurefor serial port.
The ST3243 has a proprietary low-dropout
transmitter output stage enabling true RS-232
performance froma 3.0Vto 5.5V supply witha
dual charge pump. The deviceis guaranteedto
runat data ratesof 250kbps while maintaining
RS-232 output levels.
The Auto-powerdown feature functions when
FORCEONis low and FORCEOFFis high. During
this modeof operation,if the device does not
sensea valid RS-232 signal, the driver outputs are
disabled.If FORCEOFFis set low, both drivers
and receivers (expert R2B) are shut off, and
supply currentis reducedto 1mA. Disconnecting
the serial portor turning off the peripheral drives
causes the auto-powerdown conditionto occur.
Auto-powerdown can be disabled when
FORCEON and FORCEOFF are high, and should done when drivinga serial mouse. With
Auto-powerdown enabled, the deviceis activated
automatically whena valid signalis appliedto any
receiver input.
Typical application arein notebook, subnotebook,
palmtop computers, battery-powered equipment,
hand-held equipment, peripherals and printers.
ST3243
TO 5.5V, 400KBPS, RS-232
TRANSCEIVER WITH AUTO-POWERDOWN
ST3243
2/14
ORDERING CODES
PIN DESCRIPTION
ST3243
3/14
PIN CONFIGURATION
TRUTH TABLE
Ifthepartisin auto-powerdown mode (FORCE OFF =VCC,FORCEON= GND)itis shutdown,ifno valid RS-232levelsare presentonall
receiver input
ABSOLUTE MAXIMUM RATINGS

AbsoluteMaximum Ratingsare those values beyond which damagetothe device may occur. Functional operation under theseconditionis
not implied.V+ andV-can havea maximum magnitudeof +7V,but their absolute additioncannot exceed13V.
(*) The device doesn’t meet 1KV ESD HBM
ST3243
4/14
ELECTRICAL CHARACTERISTICS

(C1 -C4 =0.1μF, VCC =3V to5.5V,TA= -40to 85°C, unless otherwise specified.
Typical values are referredtoTA =25°C)
LOGIC INPUT ELECTRICAL CHARACTERISTICS

(C1 -C4 =0.1μF, VCC =3V to5.5V,TA= -40to 85°C, unless otherwise specified.
Typical values are referredtoTA =25°C)
AUTO-POWERDOWN ELECTRICAL CHARACTERISTICS
1 -C4 =0.1μF,VCC =3V to5.5V,TA= -40to 85°C, unless otherwise specified.
Typical values are referredtoTA =25°C)
ST3243
5/14
TRANSMITTER ELECTRICAL CHARACTERISTICS

(C1 -C4 =0.1μF, VCC =3V to5.5V,TA= -40to 85°C, unless otherwise specified.
Typical values are referredtoTA =25°C)
RECEIVER ELECTRICAL CHARACTERISTICS
1 -C4 =0.1μF,VCC =3V to5.5V,TA= -40to 85°C, unless otherwise specified.
Typical values are referredtoTA =25°C)
TIMING CHARACTERISTICS
1 -C4 =0.1μF,VCC =3V to5.5V,TA= -40to 85°C, unless otherwise specified.
Typical values are referredtoTA =25°C)
ST3243
6/14
APPLICATION CIRCUITS
CAPACITANCE VALUE (μF)
ST3243
7/14
TYPICAL PERFORMANCE CHARACTERISTICS
(unless otherwise specifiedTj =25°C)
Figure1:
INVALID HIGH Threshold Time
Figure2:
INVALID LOW Threshold Time
Figure3:
Receiver Propagation Delay
Figure4:
Receiver Output Enable& Disable
Time
Figure5:
Output Currentvs Output High Voltage
Figure6:
Output Currentvs Output Low Voltage
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