TRSF3238IPW Datasheet, PDF (1/17 Pages) Texas Instruments – 3-V TO 5.5-V MULTICHANNEL RS-232 COMPATIBLE LINE DRIVER/RECEIVER

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TRSF3238
3-V TO 5.5-V MULTICHANNEL RS-232 COMPATIBLE LINE DRIVER/RECEIVER
SLLS859 – AUGUST 2007
FEATURES
• Auto-Powerdown Plus
• Operates With 3-V to 5.5-V V_CC Supply
• Always-Active Noninverting Receiver Output
(ROUT1B)
• Supports Operation From 250 kbit/s to
1 Mbit/s
• Low Standby Current . . . 1 μA Typical
• External Capacitors . . . 4 × 0.1 μF
• Accepts 5-V Logic Input With 3.3-V Supply
• Inter-Operable With TRSF3243
• RS-232 Bus-Pin ESD Protection Exceeds
±15 kV Using Human-Body Model (HBM)
APPLICATIONS
• Battery-Powered Systems
• PDAs
• Notebooks
• Subnotebooks
• Laptops
• Palmtop PCs
• Hand-Held Equipment
• Modems
• Printers
DB, DW, 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
DESCRIPTION/ORDERING INFORMATION
The TRSF3238 device consists of five line drivers, three line receivers, and a dual charge-pump circuit with
±15-kV ESD protection pin to pin (serial-port connection pins, including GND). 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 (ROUT1B), which allows applications using the ring indicator to transmit data
while the device is powered down. This device operates at data signaling rate up to 1 Mbit/s and at an increased
slew-rate range of 24 V/μs to 150 V/μs.
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 automatically activates 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