MAX3238
3 V TO 5.5 V MULTICHANNEL RS 232 LINE DRIVER/RECEIVER
WITH 15 kV ESD (HBM) PROTECTION
SLLS349J - JUNE 1999 - REVISED MARCH 2004
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D
RS-232 Bus-Pin ESD Protection Exceeds
15 kV Using Human-Body Model (HBM)
D
Meets or Exceeds the Requirements of
TIA/EIA-232-F and ITU v.28 Standards
D
Operates With 3-V to 5.5-V V
CC
Supply
D
Operates Up To 250 kbit/s
D
Five Drivers and Three Receivers
D
Low Standby Current . . . 1
A Typical
D
External Capacitors . . . 4
0.1
F
D
Accepts 5-V Logic Input With 3.3-V Supply
D
Always-Active Noninverting Receiver
Output (ROUT1B)
D
Alternative High-Speed Pin-Compatible
Device (1 Mbit/s)
- SNx5C3238
D
Applications
- Battery-Powered Systems, PDAs,
Notebooks, Subnotebooks, Laptops,
Palmtop PCs, Hand-Held Equipment,
Modems, and Printers
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/
s driver output slew rate.
ORDERING INFORMATION
TA
PACKAGE
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
SSOP (DB)
Tube of 50
MAX3238CDB
MAX3238C
-0
C to 70
C
SSOP (DB)
Reel of 2000
MAX3238CDBR
MAX3238C
-0
C to 70
C
TSSOP (PW)
Tube of 50
MAX3238CPW
MA3238C
TSSOP (PW)
Reel of 2000
MAX3238CPWR
MA3238C
SSOP (DB)
Tube of 50
MAX3238IDB
MAX3238I
-40
C to 85
C
SSOP (DB)
Reel of 2000
MAX3238IDBR
MAX3238I
-40
C to 85
C
TSSOP (PW)
Tube of 50
MAX3238IPW
MB3238I
TSSOP (PW)
Reel of 2000
MAX3238IPWR
MB3238I
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.
Copyright
2004, Texas Instruments Incorporated
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.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
C2 +
GND
C2-
V-
DOUT1
DOUT2
DOUT3
RIN1
RIN2
DOUT4
RIN3
DOUT5
FORCEON
FORCEOFF
C1+
V+
V
CC
C1-
DIN1
DIN2
DIN3
ROUT1
ROUT2
DIN4
ROUT3
DIN5
ROUT1B
INVALID
DB OR PW PACKAGE
(TOP VIEW)
PRODUCTION DATA information is 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.
MAX3238
3 V TO 5.5 V MULTICHANNEL RS 232 LINE DRIVER/RECEIVER
WITH 15 kV ESD (HBM) PROTECTION
SLLS349J - JUNE 1999 - REVISED MARCH 2004
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
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
A. 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
s. INVALID is low (invalid
data) if all receiver input voltages are between -0.3 V and 0.3 V for more than 30
s. Refer to Figure 5 for receiver
input levels.
Function Tables
EACH DRIVER
INPUTS
OUTPUT
DIN
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
Normal operation with
H
H
H
X
L
Normal operation with
auto-powerdown plus disabled
L
L
H
<30 s
H
Normal operation with
H
L
H
<30 s
L
Normal operation with
auto-powerdown plus enabled
L
L
H
>30 s
Z
Powered off by
H
L
H
>30 s
Z
Powered off by
auto-powerdown plus feature
H = high level, L = low level, X = irrelevant, Z = high impedance
EACH RECEIVER
INPUTS
OUTPUTS
RIN1
RIN2-RIN3
FORCEOFF
TIME ELAPSED SINCE LAST RIN
OR DIN TRANSITION
ROUT1B
ROUT
RECEIVER STATUS
L
X
L
X
L
Z
Powered off while
H
X
L
X
H
Z
Powered off while
ROUT1B is active
L
L
H
<30 s
L
H
L
H
H
<30 s
L
L
Normal operation with
H
L
H
<30 s
H
H
Normal operation with
auto-powerdown plus
disabled/enabled
H
H
H
<30 s
H
L
auto-powerdown plus
disabled/enabled
Open
Open
H
>30 s
L
H
H = high level, L = low level, X = irrelevant, Z = high impedance (off), Open = input disconnected or connected driver off
MAX3238
3 V TO 5.5 V MULTICHANNEL RS 232 LINE DRIVER/RECEIVER
WITH 15 kV ESD (HBM) PROTECTION
SLLS349J - JUNE 1999 - REVISED MARCH 2004
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
logic diagram (positive logic)
DIN3
DIN2
DIN1
DOUT3
DOUT2
DOUT1
Auto-powerdown
Plus
INVALID
RIN1
RIN2
RIN3
FORCEOFF
FORCEON
ROUT1
ROUT1B
ROUT2
ROUT3
24
23
22
14
13
21
16
20
18
5
6
7
15
8
9
11
DIN4
DOUT4
19
10
DIN5
DOUT5
17
12
MAX3238
3 V TO 5.5 V MULTICHANNEL RS 232 LINE DRIVER/RECEIVER
WITH 15 kV ESD (HBM) PROTECTION
SLLS349J - JUNE 1999 - REVISED MARCH 2004
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, V
CC
(see Note 1)
-0.3 V to 6 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Positive output supply voltage range, V+ (see Note 1)
-0.3 V to 7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Negative output supply voltage range, V- (see Note 1)
0.3 V to -7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply voltage difference, V+
-
V- (see Note 1)
13 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, V
I
: Driver (FORCEOFF, FORCEON)
-0.3 V to 6 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Receiver
-25 V to 25 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output voltage range, V
O
: Driver
-13.2 V to 13.2 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Receiver (INVALID)
-0.3 V to V
CC
+ 0.3 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance,
JA
(see Notes 2 and 3): DB package
62
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . .
PW package
62
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . .
Operating virtual junction temperature, T
J
150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
-65
C to 150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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.
NOTES:
1. All voltages are with respect to network GND.
2. Maximum power dissipation is a function of TJ(max),
JA, and TA. The maximum allowable power dissipation at any allowable
ambient temperature is PD = (TJ(max) - TA)/
JA. Operating at the absolute maximum TJ of 150
C can affect reliability.
3. The package thermal impedance is calculated in accordance with JESD 51-7.
recommended operating conditions (see Note 4 and Figure 6)
MIN
NOM
MAX
UNIT
Supply voltage
VCC = 3.3 V
3
3.3
3.6
V
Supply voltage
VCC = 5 V
4.5
5
5.5
V
VIH
Driver and control high-level input voltage
DIN, FORCEOFF, FORCEON
VCC = 3.3 V
2
V
VIH
Driver and control high-level input voltage
DIN, FORCEOFF, FORCEON
VCC = 5 V
2.4
V
VIL
Driver and control low-level input voltage
DIN, FORCEOFF, FORCEON
0.8
V
VI
Driver and control input voltage
DIN, FORCEOFF, FORCEON
0
5.5
V
VI
Receiver input voltage
-25
25
V
TA
Operating free-air temperature
MAX3238C
0
70
C
TA
Operating free-air temperature
MAX3238I
-40
85
C
NOTE 4: Testing supply conditions are C1-C4 = 0.1
F at VCC = 3.3 V
0.15 V; C1-C4 = 0.22
F at VCC = 3.3 V
0.3 V; and C1 = 0.047
F
and C2-C4 = 0.33
F at VCC = 5 V
0.5 V.
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (see Note 4 and Figure 6)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
II
Input leakage current
FORCEOFF, FORCEON
0.01
1
A
Auto-powerdown plus
disabled
No load,
FORCEOFF and FORCEON at VCC
0.5
2
mA
ICC
Supply current
(T = 25 C)
Powered off
No load, FORCEOFF at GND
1
10
ICC
Supply current
(TA = 25
C)
Auto-powerdown plus
enabled
No load, FORCEOFF at VCC,
FORCEON at GND,
All RIN are open or grounded
1
10
A
All typical values are at VCC = 3.3 V or VCC = 5 V, and TA = 25
C.
NOTE 4: Testing supply conditions are C1-C4 = 0.1
F at VCC = 3.3 V
0.15 V; C1-C4 = 0.22
F at VCC = 3.3 V
0.3 V; and C1 = 0.047
F
and C2-C4 = 0.33
F at VCC = 5 V
0.5 V.
MAX3238
3 V TO 5.5 V MULTICHANNEL RS 232 LINE DRIVER/RECEIVER
WITH 15 kV ESD (HBM) PROTECTION
SLLS349J - JUNE 1999 - REVISED MARCH 2004
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
DRIVER SECTION
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (see Note 4 and Figure 6)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
VOH
High-level output voltage
All DOUT at RL = 3 k
to GND
5
5.4
V
VOL
Low-level output voltage
All DOUT at RL = 3 k
to GND
-5
-5.4
V
IIH
High-level input current
VI = VCC
0.01
1
A
IIL
Low-level input current
VI at GND
0.01
1
A
IOS
Short-circuit output current
VCC = 3.6 V,
VO = 0 V
35
60
mA
IOS
Short-circuit output current
VCC = 5.5 V,
VO = 0 V
40
100
mA
ro
Output resistance
VCC, V+, and V- = 0 V,
VO =
2 V
300
10M
Ioff
Output leakage current
FORCEOFF = GND
VO =
12 V,
VCC = 3 V to 3.6 V
25
A
Ioff
Output leakage current
FORCEOFF = GND
VO =
10 V,
VCC = 4.5 V to 5.5 V
25
A
All typical values are at VCC = 3.3 V or VCC = 5 V, and TA = 25
C.
Short-circuit durations should be controlled to prevent exceeding the device absolute power-dissipation ratings, and not more than one output
should be shorted at a time.
NOTE 4: Testing supply conditions are C1-C4 = 0.1
F at VCC = 3.3 V
0.15 V; C1-C4 = 0.22
F at VCC = 3.3 V
0.3 V; and C1 = 0.047
F
and C2-C4 = 0.33
F at VCC = 5 V
0.5 V.
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (see Note 4 and Figure 6)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Maximum data rate
CL = 1000 pF,
One DOUT switching,
RL = 3 k
,
See Figure 1
150
250
kbit/s
tsk(p)
Pulse skew
CL = 150 pF to 2500 pF
RL = 3 k
to 7 k
,
See Figure 2
100
ns
SR(tr)
Slew rate, transition region
VCC = 3.3 V
,
CL = 150 pF to 1000 pF
6
30
V/
s
SR(tr)
Slew rate, transition region
(see Figure 1)
VCC = 3.3 V
,
RL = 3 k
to 7 k
CL = 150 pF to 2500 pF
4
30
V/
s
All typical values are at VCC = 3.3 V or VCC = 5 V, and TA = 25
C.
Pulse skew is defined as |tPLH - tPHL| of each channel of the same device.
NOTE 4: Testing supply conditions are C1-C4 = 0.1
F at VCC = 3.3 V
0.15 V; C1-C4 = 0.22
F at VCC = 3.3 V
0.3 V; and C1 = 0.047
F
and C2-C4 = 0.33
F at VCC = 5 V
0.5 V.
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