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C2+
GND
C2−
V−
DOUT1
DOUT2
DOUT3
RIN1
RIN2
DOUT4
RIN3
DOUT5
EN
SHDN
C1+
V+
V
CC
C1−
DIN1
DIN2
DIN3
ROUT1
ROUT2
DIN4
ROUT3
DIN5
ROUT1B
MBAUD
DB, DW, OR PW PACKAGE
(TOP VIEW)
RHB PACKAGE
(TOP VIEW)
C1–
DIN1
IN2
DIN3
ROUT1
ROUT2
DIN4
ROUT3
DOUT1
DOUT2
DOUT3
RIN1
RIN2
DOUT4
RIN3
N.C.
V−
C2–
GND
C2+
C1+
V+
V
CC
N.C.
DOUT5
EN
SHDN
MBAUD
N.C.
ROUT1B
DIN5
N.C.
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2
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5
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8
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3132 30 29 28 27 26 25
109 11 12 13 14 15 16
N.C.– Not internally connected
TRS3237E
www.ti.com
SLLS796A –JUNE 2007–REVISED JANUARY 2010
3-V TO 5.5-V MULTICHANNEL RS-232 1-MBit/s LINE DRIVER/RECEIVER
Check for Samples: TRS3237E
1
FEATURES
• Meets or Exceeds the Requirements of • ESD Protection for RS-232 I/O Pins
TIA/EIA-232-F and ITU v.28 Standards
– ±15 kV – Human-Body Model (HBM)
• Operates With 3-V to 5.5-V V
CC
Supply
– ±8 kV – IEC61000-4-2, Contact Discharge
• Operates From 250 kbits/s to 1 Mbit/s
– ±15 kV – IEC61000-4-2, Air-Gap Discharge
• Low Standby Current . . . 1 mA Typical
APPLICATIONS
• External Capacitors . . . 4 × 0.1 mF
• Battery-Powered, Hand-Held, and Portable
• Accepts 5-V Logic Input With 3.3-V Supply
Equipment
• Designed to Be Interchangeable With Industry
• PDAs and Palmtop PCs
Standard '3237E Devices
• Notebooks, Sub-Notebooks, and Laptops
• Latch-Up Performance Exceeds 100 mA Per
• Digital Cameras
JESD 78, Class II
• Mobile Phones and Wireless Devices
DESCRIPTION/ORDERING INFORMATION
The TRS3237E 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 device meets the requirements of
TIA/EIA-232-F and 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. This device operates at data signaling rates of 250 kbit/s in normal operating mode
(MBAUD = GND) and 1Mbit/s when MBAUD = V
CC
. The driver output slew rate is a maximum of 30 V/ms.
1
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.
Copyright © 2007–2010, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.

TRS3237E
SLLS796A –JUNE 2007–REVISED JANUARY 2010
www.ti.com
The TRS3237E transmitters are disabled and the outputs are forced into high-impedance state when the device
is in shutdown mode (SHDN = GND) and the supply current falls to less than 1 mA. Also, during shutdown, the
onboard charge pump is disabled; V+ is lowered to V
CC
, and V– is raised toward GND. Receiver outputs also
can be placed in the high-impedance state by setting enable (EN) high. ROUT1B remains active all the time,
regardless of the EN and SHDN condition.
The TRS3237EC is characterized for operation from 0°C to 70°C. The TRS3237EI is characterized for operation
from –40°C to 85°C.
Table 1. ORDERING INFORMATION
(1)
T
A
PACKAGE
(2)
ORDERABLE PART NUMBER TOP-SIDE MARKING
SSOP – DB Reel of 2000 TRS3237ECDBR TRS3237EC
SOIC – DW Reel of 2000 TRS3237ECDWR TRS3237EC
0°C to 70°C
TSSOP – PW Reel of 2000 TRS3237ECPWR RS37EC
QFN – RHB Reel of 2000 TRS3237ECRHBR PREVIEW
SSOP – DB Reel of 2000 TRS3237EIDBR TRS3237EI
SOIC – DW Reel of 2000 TRS3237EIDWR TRS3237EI
–40°C to 85°C
TSSOP – PW Reel of 2000 TRS3237EIPWR RS37EI
QFN – RHB Reel of 2000 TRS3237EIRHBR PREVIEW
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
(2) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
Table 2. FUNCTION TABLE
INPUTS OUTPUTS
SHDN EN DOUT ROUT ROUT1B
0 0 Z
(1)
Active Active
0 1 Z
(1)
Z
(1)
Active
1 0 Active Active Active
1 1 Active Z
(1)
Active
(1) Z = high impedance (off)
2 Submit Documentation Feedback Copyright © 2007–2010, Texas Instruments Incorporated
Product Folder Link(s): TRS3237E

DIN3
DIN2
DIN1
DOUT3
DOUT2
DOUT1
RIN1
RIN2
RIN3
ROUT1
ROUT1B
ROUT2
ROUT3
24
23
22
21
16
20
18
5
6
7
8
9
11
DIN4
DOUT4
19 10
DIN5
DOUT5
17 12
13
EN
SHDN
14
MBAUD
15
TRS3237E
www.ti.com
SLLS796A –JUNE 2007–REVISED JANUARY 2010
LOGIC DIAGRAM (POSITIVE LOGIC)
Copyright © 2007–2010, Texas Instruments Incorporated Submit Documentation Feedback 3
Product Folder Link(s): TRS3237E

TRS3237E
SLLS796A –JUNE 2007–REVISED JANUARY 2010
www.ti.com
ABSOLUTE MAXIMUM RATINGS
(1)
over operating free-air temperature range (unless otherwise noted)
MIN MAX UNIT
V
CC
Supply voltage range
(2)
–0.3 6 V
V+ Positive-output supply voltage range
(2)
–0.3 7 V
V– Negative-output supply voltage range
(2)
0.3 –7 V
V+ – V– Supply voltage difference
(2)
13 V
Driver (SHDN, MBAUD, EN) –0.3 6
V
I
Input voltage range V
Receiver –25 25
Driver –13.2 13.2
V
O
Output voltage range V
Receiver –0.3 V
CC
+ 0.3
Short-circuit duration DOUT to GND Unlimited
q
JA
Package thermal impedance
(3)
62 °C/W
T
stg
Storage temperature range –65 150 °C
(1) Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating
conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) All voltages are with respect to network GND.
(3) The package thermal impedance is calculated in accordance with JESD 51-7.
RECOMMENDED OPERATING CONDITIONS
(1)
See Figure 5
MIN NOM MAX UNIT
V
CC
= 3.3 V 3 3.3 3.6
Supply voltage V
V
CC
= 5 V 4.5 5 5.5
V
CC
= 3.3 V 2 5.5
V
IH
Driver and control high-level input voltage DIN, SHDN, MBAUD, EN V
V
CC
= 5 V 2.4 5.5
V
IL
Driver and control low-level input voltage DIN, SHDN, MBAUD, EN 0 0.8 V
V
I
Receiver input voltage –25 25 V
TRS3237EC 0 70
T
A
Operating free-air temperature °C
TRS3237EI –40 85
(1) Test conditions are C1–C4 = 0.1 mF at V
CC
= 3 V to 5 V.
ELECTRICAL CHARACTERISTICS
(1)
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) (see Figure 5)
PARAMETER TEST CONDITIONS MIN TYP
(2)
MAX UNIT
I
I
Input leakage current DIN, SHDN, MBAUD, EN 9 18 mA
No load, SHDN = V
CC
0.5 2 mA
Supply current SHDN = GND 1 10 mA
I
CC
(T
A
= 25°C)
Shutdown supply current
SHDN = RIN = GND,
10 300 nA
DIN = GND or V
CC
(1) Test conditions are C1–C4 = 0.1 mF at V
CC
= 3 V to 5 V.
(2) All typical values are at V
CC
= 3.3 V or V
CC
= 5 V, and T
A
= 25°C.
4 Submit Documentation Feedback Copyright © 2007–2010, Texas Instruments Incorporated
Product Folder Link(s): TRS3237E
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