www.ti.com
TRSF3238E
3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER
WITH ±15-kV ESD (HBM) PROTECTION
SLLS826 – AUGUST 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 VCC Supply
Operates up to 1000 kbit/s
Five Drivers and Three Receivers
Auto-Powerdown Plus Feature Enables
Flexible Power-Down Mode
Low Standby Current . . . 1 μA Typical
External Capacitors . . . 4 × 0.1 μF
Accept 5-V Logic Input With 3.3-V Supply
Always-Active Noninverting Receiver Output
(ROUT1B)
ESD Protection for RS-232 Interface Pins
– ±15-kV Human-Body Model (HBM)
– ±8-kV IEC61000-4-2, Contact Discharge
– ±15-kV IEC61000-4-2, Air-Gap Discharge
DB, DW, OR PW PACKAGE
(TOP VIEW)
C2 +
GND
C2−
V−
DOUT1
DOUT2
DOUT3
RIN1
RIN2
DOUT4
RIN3
DOUT5
FORCEON
FORCEOFF
Battery-Powered Systems
PDAs
Notebooks
Subnotebooks
Laptops
Palmtop PCs
Hand-Held Equipment
Modems
Printers
28
2
27
3
26
4
25
5
24
6
23
7
22
8
21
9
20
10
19
11
18
12
17
13
16
14
15
C1+
V+
VCC
C1−
DIN1
DIN2
DIN3
ROUT1
ROUT2
DIN4
ROUT3
DIN5
ROUT1B
INVALID
RHB PACKAGE
(TOP VIEW)
APPLICATIONS
•
•
•
•
•
•
•
•
•
1
V−
C2–
GND
C2+
C1+
V+
VCC
NC
•
32 31 30 29 28 27 26 25
DOUT1
DOUT2
DOUT3
RIN1
RIN2
DOUT4
RIN3
NC
1
2
3
4
5
6
7
8
24
23
22
21
20
19
18
17
C1–
DIN1
DIN2
DIN3
ROUT1
ROUT2
DIN4
ROUT3
DOUT5
FORCEON
FORCEOFF
INVALID
NC
ROUT1B
DIN5
NC
9 10 11 12 13 14 15 16
DESCRIPTION/ORDERING INFORMATION
The TRSF3238E consists of five line drivers, three line receivers, and a dual charge-pump circuit with ±15-kV
ESD (HBM) protection on the driver output (DOUT) and receiver input (RIN) terminals. 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 TRSF3238E
operates at data signaling rates up to 1000 kbit/s.
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.
UNLESS OTHERWISE NOTED this document contains
PRODUCTION DATA information current as of publication date.
Products conform to specifications per the terms of Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2007, Texas Instruments Incorporated
TRSF3238E
3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER
WITH ±15-kV ESD (HBM) PROTECTION
www.ti.com
SLLS826 – AUGUST 2007
DESCRIPTION/ORDERING INFORMATION (CONTINUED)
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.
ORDERING INFORMATION
PACKAGE (1) (2)
TA
QFN – RHB
SOIC – DW
0°C to 70°C
SSOP – DB
TSSOP – PW
QFN – RHB
SOIC – DW
–40°C to 85°C
SSOP – DB
TSSOP – PW
(1)
(2)
2
ORDERABLE PART NUMBER
Reel of 2000
TRSF3238ECRHBR
Tube of 50
TRSF3238ECDW
Reel of 2000
TRSF3238ECDWR
Tube of 50
TRSF3238ECDB
Reel of 2000
TRSF3238ECDBR
Tube of 50
TRSF3238ECPW
Reel of 2000
TRSF3238ECPWR
Reel of 2000
TRSF3238EIRHBR
Tube of 50
TRSF3238EIDW
Reel of 2000
TRSF3238EIDWR
Tube of 50
TRSF3238EIDB
Reel of 2000
TRSF3238EIDBR
Tube of 50
TRSF3238EIPW
Reel of 2000
TRSF3238EIPWR
TOP-SIDE MARKING
RS38EC
TRS3238EC
TRS3238EC
RS38EC
RS38EI
TRS3238EI
TRS3238EI
RS38EI
Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
website at www.ti.com.
Submit Documentation Feedback
TRSF3238E
3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER
WITH ±15-kV ESD (HBM) PROTECTION
www.ti.com
SLLS826 – AUGUST 2007
FUNCTION TABLES
abc
Each Driver (1)
INPUTS
DIN
(1)
FORCEON
FORCEOFF
TIME ELAPSED SINCE LAST
RIN OR DIN TRANSITION
OUTPUT
DOUT
DRIVER STATUS
X
X
L
X
Z
Powered off
L
H
H
X
H
H
H
H
X
L
Normal operation with
auto-powerdown plus disabled
L
L
H
30 s
Z
Normal operation with
auto-powerdown plus enabled
Powered off by
auto-powerdown plus feature
H = high level, L = low level, X = irrelevant, Z = high impedance
Each Receiver (1)
INPUTS
OUTPUTS
RIN1
RIN2 AND
RIN3
FORCEOFF
TIME ELAPSED SINCE LAST
RIN OR DIN TRANSITION
ROUT1B
ROUT2 AND
ROUT3
RECEIVER STATUS
Powered off while
ROUT1B is active
L
X
L
X
L
Z
H
X
L
X
H
Z
L
L
H
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