SN65C3221IPWRQ1 ,Automotive Catalog 3-V to 5.5-V Multichannel RS-232 Line Driver/Receiver 16-TSSOP -40 to 85 SLLS616B − APRIL 2004 ..
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SN65C3221PWRE4 ,3-V To 5.5-V Multichannel RS-232 Line Driver/Receiver 16-TSSOP -40 to 85/sc/package.Please be aware that an important notice concerning availability, standard warranty, an ..
SN65C3222DBR ,3-V To 5.5-V Multichannel RS-232 Compatible Line Driver/Receiver SLLS534B − MAY 200 ..
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SN74HC245PW ,Octal Bus Transceivers With 3-State OutputsElectrical Characteristics....... 512.1 Related Links.. 116.6 Switching Characteristics, C = 50 pF. ..
SN65C3221IPWRQ1
Automotive Catalog 3-V to 5.5-V Multichannel RS-232 Line Driver/Receiver
External Capacitors ...4 × 0.1 µF Accepts 5-V Logic Input With 3.3-V Supply RS-232 Bus-Pin ESD Protection Exceeds±15 kV Using Human-Body Model (HBM)
Auto-Powerdown Feature Automatically
Disables Drivers for Power Savings Applications
− Battery-Powered, Hand-Held, and
Portable Equipment
− PDAs and Palmtop PCs
− Notebooks, Sub-Notebooks, and Laptops
− Digital Cameras
− Mobile Phones and Wireless Devices
description/ordering informationThe SN65C3221 consists 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). This device provides 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. This device operates 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 device does 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. See Figure 5 for receiver input levels.
ORDERING INFORMATION�
†For the most current package and ordering information, see the Package Option Addendum at the end of this
document, or see the TI web site at http://www.ti.com.
‡Package drawings, thermal data, and symbolization are available at http://www.ti.com/packaging.
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.
C1−
C2+
C2−
RIN
GND
DOUT
FORCEON
DIN
INVALID
ROUT
