TRS3238 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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TRS3238
3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER
WITH ±15-kV ESD (HBM) PROTECTION
SLLS817 – JULY 2007
FEATURES
• 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
• Operates up to 250 kbit/s
• Five Drivers and Three Receivers
• Low Standby Current . . . 1 μA Typical
• External Capacitors . . . 4 × 0.1 μF
• Accepts 5-V Logic Input With 3.3-V Supply
• Always-Active Noninverting Receiver Output
(ROUT1B)
• Alternative High-Speed Pin-Compatible Device
(1 Mbit/s)
– TRSF3238
DB OR PW PACKAGE
(TOP VIEW)
C2 + 1
GND 2
C2− 3
V− 4
DOUT1 5
DOUT2 6
DOUT3 7
RIN1 8
RIN2 9
DOUT4 10
RIN3 11
DOUT5 12
FORCEON 13
FORCEOFF ¹⁴
28 C1+
27 V+
26 V_CC
25 C1−
24 DIN1
23 DIN2
22 DIN3
21 ROUT1
20 ROUT2
19 DIN4
18 ROUT3
17 DIN5
16 ROUT1B
15 _INVALID
APPLICATIONS
• Battery-Powered Systems
• PDAs
• Notebooks
• Subnotebooks
• Laptops
• Palmtop PCs
• Hand-Held Equipment
• Modems
• Printers
DESCRIPTION/ORDERING INFORMATION
The TRS3238 consists of five line drivers, three 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 notebook and subnotebook computer applications.
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 (ROUT1B), which allows applications using
the ring indicator to transmit data while the device is powered down. The TRS3238 operates at data signaling
rates up to 250 kbit/s and a maximum of 30-V/μs driver output slew rate.
Flexible control options for power management are featured when the serial port and driver inputs are inactive.
The auto-powerdown plus feature functions when FORCEON is low and FORCEOFF is high. During this mode
of operation, if the device does not sense valid signal transitions on all receiver and driver inputs for
approximately 30 s, the built-in charge pump and drivers are powered down, reducing the supply current to
1 μA. By disconnecting the serial port or placing the peripheral drivers off, auto-powerdown plus occurs if there
is no activity in the logic levels for the driver inputs. Auto-powerdown plus can be disabled when FORCEON and
FORCEOFF are high. With auto-powerdown plus enabled, the device activates automatically when a valid signal
is applied to any receiver or driver 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.
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