TRS3243 Datasheet, PDF (1/19 Pages) Texas Instruments – 3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER WITH ±15-kV ESD (HBM) PROTECTION

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TRS3243
3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER
WITH ±15-kV ESD (HBM) PROTECTION
SLLS806 – JUNE 2007
FEATURES
• Single-Chip and Single-Supply Interface
for IBM™ PC/AT™ Serial Port
• 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 V_CC Supply
• Three Drivers and Five Receivers
• Low Standby Current . . . 1 mA Typical
• External Capacitors . . . 4 × 0.1 mF
• Accepts 5-V Logic Input With 3.3-V Supply
• Always-Active Noninverting Receiver
Output (ROUT2B)
• Operating Speed
– TRS3243C, TRS3243I . . . 250 Kbit/s
– TRS3243FC, TRS3243FI . . . 1000 Kbit/s
• Operating Temperature
– TRS3243C, TRS3243FC . . . 0°C to 70°C
– TRS3243I, TRS3243FI . . . –40°C to 85°C
• Serial-Mouse Driveability
• Auto-Powerdown Feature to Disable Driver
Outputs When No Valid RS-232 Signal Is
Sensed
APPLICATIONS
• Battery-Powered
• Systems
• PDAs
• Notebooks
• Laptops
• Palmtop
• PCs
• Hand-Held Equipment
DB, DW, OR PW PACKAGE
(TOP VIEW)
C2+ 1
C2− 2
V− 3
RIN1 4
RIN2 5
RIN3 6
RIN4 7
RIN5 8
DOUT1 9
DOUT2 10
DOUT3 11
DIN3 12
DIN2 13
DIN1 ¹⁴
28 C1+
27 V+
26 V_CC
25 GND
24 C1−
23 FORCEON
22 FORCEOFF
21 INVALID
20 ROUT2B
19 ROUT1
18 ROUT2
17 ROUT3
16 _ROUT4
15 _ROUT5
DESCRIPTION/ORDERING INFORMATION
The TRS3243 consists of three line drivers, five line receivers, and a dual charge-pump circuit with ±15-kV ESD
(HBM) 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. This combination of drivers and receivers matches that needed for the typical serial port
used in an IBM PC/AT or compatible. The charge pump and four small external capacitors allow operation from
a single 3-V to 5.5-V supply. In addition, the device includes an always-active noninverting output (ROUT2B),
which allows applications using the ring indicator to transmit data while the device is powered down.
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, the driver outputs are disabled. If FORCEOFF is
set low, both drivers and receivers (except ROUT2B) 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 and should be done when driving
a serial mouse. With auto-powerdown enabled, the device is activated automatically when a valid signal is
applied to any receiver input. The INVALID output is used to notify the user if an RS-232 signal is present at any
receiver input. INVALID is high (valid data) if any 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 all receiver input
voltages are between –0.3 V and 0.3 V for more than 30 μs. Refer to Figure 5 for receiver input levels.
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.
IBM, PC/AT are trademarks of IBM.
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