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ST3222EBPR-ST3222EBTR-ST3222ECPR-ST3222ECTR
15 KV ESD PROTECTED 3 TO 5.5V, LOW POWER, UP TO 250KBPS RS-232 DRIVERS AND RECEIVERS
1/10October 2002 ESD PROTECTIO FOR RS-232 I/O PINS
±15KV HUMAN BODY MODEL
±8KV IEC 1000-4-2 CONTACT DISCHARGE 300μA SUPPLY CURRENT 250Kbps MINIMUM GUARENTEED DATA
RATE 6V/μs MINIMUM GUARANTEED SLEW RATE MEET EIA/TIA-232 SPECIFICATIONS DOWN 3V AVAILABLEIN SO-18, SSOP20 AND
TSSOP20
DESCRIPTIONThe ST3222Eisa 3V powered EIA/TIA-232 and
V.28/V.24 communications interface with low
power requirements, high data-rate capabilities
and enhanced electrostatic discharge (ESD)
protection to ±8kV using IEC1000-4-2 Contact
Discharge and ±15kV using the Human Body
Model. ST3222E hasa proprietary low dropout
transmitter output stage providing true RS-232
performance from3to 5V supplies witha dual
charge pump. The charge pump requires only four
small 0.1mF external capacitorsfor operation form supply.
The device has two receivers and two drivers. The
ST3222E featuresa 1μA shutdown mode that
reduces power consumption and extends battery
lifein portable systems. Its receivers can remain
active in shutdown mode, allowing external
devices such as modemsto be monitored using
only 1μA supply current.
The deviceis guaranteedto runat data ratesof
250Kbps while maintaining RS-232 output levels.
Typical applications are Notebook, Subnotebook
and Palmtop Computers, Battery Powered
Equipment, Hand-Held Equipment, Peripherals
and Printers.
ORDERING CODES
ST3222E±15KV ESD-PROTECTED,3 TO 5.5V, LOW POWER, TO 250KBPS, RS-232 DRIVERS AND RECEIVERS
ST3222E2/10
PIN CONFIGURATION
PIN DESCRIPTION
ST3222E3/10
ABSOLUTE MAXIMUM RATINGSAbsoluteMaximum Ratingsare those values beyond which damagetothe device may occur. Functional operation under these conditionis
not implied.V+ andV-can havea maximum magnitudeof +7V,but their absolute additioncannot exceed13V.
SHUTDOWN AND ENABLE CONTROL TRUTH TABLE
ESD PERFORMANCE: TRANSMITTER OUTPUTS, RECEIVER INPUTS
ELECTRICAL CHARACTERISTICS1 -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)
Note1: Transmitter input hysteresisis typically 250mV
ST3222E4/10
TRANSMITTER ELECTRICAL CHARACTERISTICS(C1 -C4 =0.1μFVCC =3V to5.5V,TA= -40to 85°C, unless otherwise specified.
Typical values are referredtoTA =25°C)
RECEIVER ELECTRICAL CHARACTERISTICS1 -C4 =0.1μFVCC =3V to5.5V,TA= -40to 85°C, unless otherwise specified.
Typical values are referredtoTA =25°C)
TIMING CHARACTERISTICS(C1 -C4 =0.1μF, VCC =3V to5.5V,TA= -40to 85°C, unless otherwise specified.
Typical values are referredtoT =25°C)
(Note1) Transmitter Skewis measuredatthe transmitter zero cross points
ST3222E5/10
APPLICATION CIRCUITS
CAPACITANCE VALUE (μF)
ST3222E6/10
TYPICAL PERFORMANCE CHARACTERISTICS (unless otherwise specifiedTj= 25°C)
Figure1: Output Currentvs Output High Voltage
Figure2: Output Currentvs Output High Voltage
Figure3: Output Currentvs Output Low Voltage
Figure4: Output Currentvs Output Low Voltage
Figure5: Voltage Transfer Characteristics
for Trasmitter Inputs
Figure6: Receiver Input Resistance
