SN65C3221_06 Datasheet, PDF (1/16 Pages) Texas Instruments – 3-V TO 5.5-V SINGLE CHANNEL RS-232 COMPATIBLE LINE DRIVER/RECEIVER

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SN65C3221, SN75C3221
3ĆV TO 5.5ĆV SINGLEĆCHANNEL RSĆ232 COMPATIBLE LINE DRIVER/RECEIVER
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SLLS351E − APRIL 2002 − REVISED OCTOBER 2004
D Operate With 3-V to 5.5-V V_CC Supply
D Operate Up To 1 Mbit/s
D Low Standby Current . . . 1 µA Typ
D External Capacitors . . . 4 × 0.1 µF
D Accepts 5-V Logic Input With 3.3-V Supply
D RS-232 Bus-Pin ESD Protection Exceeds
±15 kV Using Human-Body Model (HBM)
D Auto-Powerdown Feature Automatically
Disables Drivers for Power Savings
D Applications
− Battery-Powered, Hand-Held, and
Portable Equipment
− PDAs and Palmtop PCs
− Notebooks, Sub-Notebooks, and Laptops
− Digital Cameras
− Mobile Phones and Wireless Devices
DB OR PW PACKAGE
(TOP VIEW)
EN 1
C1+ 2
V+ 3
C1− 4
C2+ 5
C2− ⁶
V− ⁷
RIN ⁸
16 FORCEOFF
15 V_CC
14 GND
13 DOUT
12 FORCEON
11 _DIN
10 _INVALID
9 _ROUT
description/ordering information
The SN65C3221 and SN75C3221 consist of one line driver, one line receiver, and a dual charge-pump circuit
with ±15-kV ESD protection pin to pin (serial-port connection pins, including GND). These devices provide the
electrical interface between an asynchronous communication controller and the serial-port connector. The
charge pump and four small external capacitors allow operation from a single 3-V to 5.5-V supply. These devices
operate at data signaling rates up to 1 Mbit/s and a driver output slew rate of 24 V/µs to 150 V/µs.
Flexible control options for power management are available when the serial port is inactive. The
auto-powerdown feature functions when FORCEON is low and FORCEOFF is high. During this mode of
operation, if the devices do not sense a valid RS-232 signal on the receiver input, the driver output is disabled.
If FORCEOFF is set low and EN is high, both the driver and receiver are shut off, and the supply current is
reduced to 1 µA. Disconnecting the serial port or turning off the peripheral drivers causes the auto-powerdown
condition to occur. Auto-powerdown can be disabled when FORCEON and FORCEOFF are high. With
auto-powerdown enabled, the device is activated automatically when a valid signal is applied to the receiver
input. The INVALID output notifies the user if an RS-232 signal is present at the receiver input. INVALID is high
(valid data) if the receiver input voltage is greater than 2.7 V or less than −2.7 V, or has been between −0.3 V
and 0.3 V for less than 30 µs. INVALID is low (invalid data) if the receiver input voltage is between −0.3 V and
0.3 V for more than 30 µs. Refer to Figure 5 for receiver input levels.
ORDERING INFORMATION
TA
PACKAGE†
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
SSOP (DB)
Reel of 2000 SN75C3221DBR
CA3221
−0°C to 70°C
TSSOP (PW)
Tube of 90
Reel of 2000
SN75C3221PW
SN75C3221PWR
CA3221
SSOP (DB)
Reel of 2000 SN65C3221DBR
CB3221
−40°C to 85°C
TSSOP (PW)
Tube of 90
Reel of 2000
SN65C3221PW
SN65C3221PWR
CB3221
† _{Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are}
available at www.ti.com/sc/package.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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Copyright  2004, Texas Instruments Incorporated
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