TRSF3243_15 Datasheet, PDF (1/19 Pages) Texas Instruments – 3-V TO 5.5-V MULTICHANNEL RS-232 COMPATIBLE LINE DRIVER

TRSF3243
www.ti.com............................................................................................................................................ SLLS862A – AUGUST 2007 – REVISED SEPTEMBER 2008
3-V TO 5.5-V MULTICHANNEL RS-232 COMPATIBLE LINE DRIVER/RECEIVER
FEATURES
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• Operates With 3-V to 5.5-V V_CC Supply
• Always-Active Noninverting Receiver Output
(ROUT2B)
• Low Standby Current . . . 1 µA Typ
• External Capacitors . . . 4 × 0.1 µF
• Accepts 5-V Logic Input With 3.3-V Supply
• Inter-Operable With SN65C3238, SN75C3238
• Supports Operation From 250 kbit/s to
1 Mbit/s
• RS-232 Bus-Pin ESD Protection Exceeds
±15 kV Using Human-Body Model (HBM)
• Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class II
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 TRSF3243 consists of three line drivers, five line receivers, 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. In addition, this device includes an
always-active noninverting output (ROUT2B), which allows applications using the ring indicator to transmit data
while the device is powered down. The device operates at data signaling rates up to 1 Mbit/s and an increased
slew-rate range 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, 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.
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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 © 2007–2008, Texas Instruments Incorporated