±
SLLS349J − JUNE 1999 − REVISED MARCH 2004
D RS-232 Bus-Pin ESD Protection Exceeds
D
D
D
D
D
D
D
D
D
D
DB OR PW PACKAGE
(TOP VIEW)
±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 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)
− SNx5C3238
Applications
− Battery-Powered Systems, PDAs,
Notebooks, Subnotebooks, Laptops,
Palmtop PCs, Hand-Held Equipment,
Modems, and Printers
C2 +
GND
C2−
V−
DOUT1
DOUT2
DOUT3
RIN1
RIN2
DOUT4
RIN3
DOUT5
FORCEON
FORCEOFF
1
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
description/ordering information
The MAX3238 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. These devices operate
at data signaling rates up to 250 kbit/s and a maximum of 30-V/µs driver output slew rate.
ORDERING INFORMATION
ORDERABLE
PART NUMBER
PACKAGE†
TA
SSOP (DB)
−0°C to 70°C
TSSOP (PW)
SSOP (DB)
−40°C to 85°C
TSSOP (PW)
Tube of 50
MAX3238CDB
Reel of 2000
MAX3238CDBR
Tube of 50
MAX3238CPW
Reel of 2000
MAX3238CPWR
Tube of 50
MAX3238IDB
Reel of 2000
MAX3238IDBR
Tube of 50
MAX3238IPW
Reel of 2000
MAX3238IPWR
TOP-SIDE
MARKING
MAX3238C
MA3238C
MAX3238I
MB3238I
† Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.
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.
Copyright 2004, Texas Instruments Incorporated
!"#$%&'(!$" !) *+%%,"( ') $# -+./!*'(!$" 0'(,
%$0+*() *$"#$%& ($ )-,*!#!*'(!$") -,% (1, (,%&) $# ,2') ")(%+&,"()
)('"0'%0 3'%%'"(4 %$0+*(!$" -%$*,))!"5 0$,) "$( ",*,))'%!/4 !"*/+0,
(,)(!"5 $# '// -'%'&,(,%)
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
1
±
SLLS349J − JUNE 1999 − REVISED MARCH 2004
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.
Function Tables
EACH DRIVER
INPUTS
OUTPUT
DOUT
DRIVER STATUS
X
Z
Powered off
Normal operation with
auto-powerdown plus disabled
DIN
FORCEON
FORCEOFF
TIME ELAPSED SINCE LAST
RIN OR DIN TRANSITION
X
X
L
L
H
H
X
H
H
H
H
X
L
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
INPUTS
RIN1
RIN2−RIN3
FORCEOFF
OUTPUTS
TIME ELAPSED SINCE LAST RIN
OR DIN TRANSITION
ROUT1B
ROUT
L
X
L
X
L
Z
H
X
L
X
H
Z
L
L
H