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TRS3222
3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER
WITH ±15-kV ESD PROTECTION
FEATURES
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RS-232 Bus-Pin ESD Protection Exceeds
±15 kV Using Human-Body Model (HBM)
Meets or Exceeds the Requirements of
TIA/EIA-232-F and ITU v.28 Standards
Operates With 3-V to 5.5-V VCC Supply
Operates up to 250 kbit/s
Two Drivers and Two Receivers
Low Standby Current . . . 1 μA Typical
External Capacitors . . . 4 × 0.1 μF
Accepts 5-V Logic Input With 3.3-V Supply
Alternative High-Speed Pin-Compatible Device
(1 Mbit/s)
– TRSF3222
SLLS815 – JULY 2007
DB, DW, OR PW PACKAGE
(TOP VIEW)
EN
C1+
V+
C1−
C2+
C2−
V−
DOUT2
RIN2
ROUT2
1
20
2
3
19
18
4
17
5
16
6
7
15
14
8
9
13
12
10
11
PWRDOWN
VCC
GND
DOUT1
RIN1
ROUT1
NC
DIN1
DIN2
NC
NC − No internal connection
APPLICATIONS
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Battery-Powered Systems
PDAs
Notebooks
Laptops
Palmtop PCs
Hand-Held Equipment
DESCRIPTION/ORDERING INFORMATION
The TRS3222 consists of two line drivers, two line receivers, and a dual charge-pump circuit with ±15-kV ESD
protection pin to pin (serial-port connection pins, including GND). The device meets the requirements of
TIA/EIA-232-F and 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. The device operates at data signaling rates up to 250 kbit/s and a maximum of 30-V/μs driver
output slew rate.
The TRS3222 can be placed in the power-down mode by setting PWRDOWN low, which draws only 1 μA from
the power supply. When the device is powered down, the receivers remain active while the drivers are placed in
the high-impedance state. Also, during power down, the onboard charge pump is disabled; V+ is lowered to VCC,
and V– is raised toward GND. Receiver outputs also can be placed in the high-impedance state by setting
EN high.
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 the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2007, Texas Instruments Incorporated
