TTI03570106
MAX232, MAX232I
DUAL EIA-232 DRIVER/RECEIVER
SLLS047D – FEBRUARY 1989 – REVISED MAY 1995
•
•
•
•
•
•
•
•
•
Operates With Single 5-V Power Supply
LinBiCMOS Process Technology
Two Drivers and Two Receivers
± 30-V Input Levels
Low Supply Current . . . 8 mA Typ
Meets or Exceeds ANSI EIA / TIA-232-E and
ITU Recommendation V.28
Designed to be Interchangeable With
Maxim MAX232
Applications
EIA/ TIA-232-E
Battery-Powered Systems
Terminals
Modems
Computers
ESD Protection Exceeds 2000 V Per
MIL-STD-883, Method 3015
DW OR N PACKAGE
(TOP VIEW)
C1 +
VS +
C1 –
C2 +
C2 –
VS –
T2OUT
R2IN
15
3
14
4
13
5
12
6
11
7
10
8
9
VCC
GND
T1OUT
R1IN
R1OUT
T1IN
T2IN
R2OUT
5V
16
C1+
C1 –
C2 +
The MAX232 is characterized for operation from
0°C to 70°C. The MAX232I is characterized for
operation from – 40°C to 85°C.
16
2
logic symbol†
description
The MAX232 is a dual driver/receiver that
includes a capacitive voltage generator to supply
EIA/TIA-232-E voltage levels from a single 5-V
supply. Each receiver converts EIA /TIA-232-E
inputs to 5-V TTL/CMOS levels. These receivers
have a typical threshold of 1.3 V and a typical
hysteresis of 0.5 V, and can accept ± 30-V inputs.
Each driver converts TTL/CMOS input levels into
EIA/TIA-232-E levels. The driver, receiver, and
voltage-generator functions are available as cells
in the Texas Instruments LinASIC library.
1
C2 –
T1IN
T2IN
R1OUT
R2OUT
1
3
4
5
C1+
VCC
C1–
2VCC – 1.5 V
C2+
–2VCC + 1.5 V
2
6
VS+
VS –
C2–
11
14
10
7
12
13
T1OUT
T2OUT
R1IN
8
9
0V
R2IN
15
GND
† This symbol is in accordance with ANSI/IEEE Std 91-1984 and
IEC Publication 617-12.
LinASIC and LinBiCMOS are trademarks of Texas Instruments Incorporated.
Copyright  1995, Texas Instruments Incorporated
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.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
2–1
MAX232, MAX232I
DUAL EIA-232 DRIVER/RECEIVER
SLLS047D – FEBRUARY 1989 – REVISED MAY 1995
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Input supply voltage range, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.3 V to 6 V
Positive output supply voltage range, VS+ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VCC – 0.3 V to 15 V
Negative output supply voltage range, VS – . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.3 V to –15 V
Input voltage range, VI:
Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.3 V to VCC + 0.3 V
Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 30 V
Output voltage range, VO: T1OUT, T2OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VS – – 0.3 V to VS+ + 0.3 V
R1OUT, R2OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.3 V to VCC + 0.3 V
Short-circuit duration: T1OUT, T2OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . unlimited
Operating free-air temperature range, TA: MAX232 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
MAX232I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 40°C to 85°C
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 65°C to 150°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°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.
NOTE 1: All voltage values are with respect to network ground terminal.
recommended operating conditions
Supply voltage, VCC
High-level input voltage, VIH (T1IN,T2IN)
MIN
NOM
MAX
4.5
5
5.5
2
V
V
Low-level input voltage, VIL (T1IN, T2IN)
Receiver input voltage, R1IN, R2IN
Operating free-air temperature,TA
UNIT
0
0.8
V
± 30
V
70
°C
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature range (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP†
7
T1OUT, T2OUT
RL = 3 kΩ to GND
5
R1OUT, R2OUT
3.5
T1OUT, T2OUT
IOH = – 1 mA
RL = 3 kΩ to GND
R1OUT, R2OUT
IOL = 3.2 mA
Receiver positive-going input
threshold voltage
R1IN, R2IN
VCC = 5 V,
TA = 25°C
Receiver negative-going input
threshold voltage
R1IN, R2IN
VCC = 5 V,
TA = 25°C
Vhys
ri
Input hysteresis voltage
R1IN, R2IN
Receiver input resistance
R1IN, R2IN
VCC = 5 V
VCC = 5,
ro
Output resistance
T1OUT, T2OUT
IOS§
IIS
Short-circuit output current
T1OUT, T2OUT
Short-circuit input current
T1IN, T2IN
ICC
Supply current
VOH
High-level output voltage
VOL
Low-level output voltage‡
VIT+
VIT–
VS+ = VS – = 0,
VCC = 5.5 V,
VI = 0
VCC = 5.5 V,
TA = 25°C
–7
MAX
V
–5
0.4
TA = 25°C
VO = ± 2 V
VO = 0
All outputs open,
1.7
UNIT
2.4
V
V
0.8
1.2
V
0.2
0.5
1
V
3
5
7
kΩ
Ω
300
±10
8
mA
200
µA
10
mA
† All typical values are at VCC = 5 V, TA = 25°C.
‡ The algebraic convention, in which the least positive (most negative) value is designated minimum, is used in this data sheet for logic voltage
levels only.
§ Not more than one output should be shorted at a time.
2–2
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
MAX232, MAX232I
DUAL EIA-232 DRIVER/RECEIVER
SLLS047D – FEBRUARY 1989 – REVISED MAY 1995
switching characteristics, VCC = 5 V, TA = 25°C
PARAMETER
tPLH(R)
tPHL(R)
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Receiver propagation delay time, low- to high-level output
See Figure 2
500
ns
Receiver propagation delay time, high- to low-level output
See Figure 2
500
ns
SR
Driver slew rate
RL = 3 kΩ to 7 kΩ,
See Figure 3
SR(tr)
Driver transition region slew rate
See Figure 4
30
3
V/µs
V/µs
APPLICATION INFORMATION
5V
16
1 µF
C1+
3
From CMOS or TTL
To CMOS or TTL
2
VS –
C2+
5
8.5 V
VS +
C1–
4
1 µF
1 µF
VCC
1
6
– 8.5 V
+
C2–
11
14
10
7
12
13
9
8
0V
1 µF
EIA/TIA-232 Output
EIA/TIA-232 Output
EIA/TIA-232 Input
EIA/TIA-232 Input
15
GND
Figure 1. Typical Operating Circuit
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
2–3
MAX232, MAX232I
DUAL EIA-232 DRIVER/RECEIVER
SLLS047D – FEBRUARY 1989 – REVISED MAY 1995
PARAMETER MEASUREMENT INFORMATION
VCC
Pulse
Generator
(see Note A)
RL = 1.3 kΩ
R1OUT
or
R2OUT
R1IN
or
R2IN
See Note C
CL = 50 pF
(see Note B)
TEST CIRCUIT
≤ 10 ns
≤ 10 ns
Input
10%
90%
50%
90%
50%
3V
10%
0V
500 ns
tPLH
tPHL
VOH
Output
1.5 V
1.5 V
VOL
WAVEFORMS
NOTES: A. The pulse generator has the following characteristics: ZO = 50 Ω, duty cycle ≤ 50%.
B. CL includes probe and jig capacitance.
C. All diodes are 1N3064 or equivalent.
Figure 2. Receiver Test Circuit and Waveforms for tPHL and tPLH Measurement
2–4
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
MAX232, MAX232I
DUAL EIA-232 DRIVER/RECEIVER
SLLS047D – FEBRUARY 1989 – REVISED MAY 1995
PARAMETER MEASUREMENT INFORMATION
T1IN or T2IN
Pulse
Generator
(see Note A)
T1OUT or T2OUT
EIA/TIA-232 Output
CL = 10 pF
(see Note B)
RL
TEST CIRCUIT
≤ 10 ns
≤ 10 ns
90%
50%
Input
10%
3V
90%
50%
10%
0V
5 µs
tPLH
tPHL
90%
Output
90%
10%
10%
VOL
tTLH
tTHL
SR
+
VOH
0.8 (V
t
–V )
OH OL
0.8 (V
or
–V
)
OL OH
t
TLH
THL
WAVEFORMS
NOTES: A. The pulse generator has the following characteristics: ZO = 50 Ω, duty cycle ≤ 50%.
B. CL includes probe and jig capacitance.
Figure 3. Driver Test Circuit and Waveforms for tPHL and tPLH Measurement (5-µs input)
Pulse
Generator
(see Note A)
EIA/TIA-232 Output
3 kΩ
CL = 2.5 nF
TEST CIRCUIT
≤ 10 ns
≤ 10 ns
Input
90%
1.5 V
10%
90%
1.5 V
10%
20 µs
tTLH
tTHL
Output
3V
3V
–3 V
–3 V
SR
+t
THL
6 V
or t
VOH
VOL
TLH
WAVEFORMS
NOTE A:
The pulse generator has the following characteristics: ZO = 50 Ω, duty cycle ≤ 50%.
Figure 4. Test Circuit and Waveforms for tTHL and tTLH Measurement (20-µs input)
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
2–5
2–6
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
IMPORTANT NOTICE
Texas Instruments (TI) reserves the right to make changes to its products or to discontinue any semiconductor
product or service without notice, and advises its customers to obtain the latest version of relevant information
to verify, before placing orders, that the information being relied on is current.
TI warrants performance of its semiconductor products and related software to the specifications applicable at
the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are
utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each
device is not necessarily performed, except those mandated by government requirements.
Certain applications using semiconductor products may involve potential risks of death, personal injury, or
severe property or environmental damage (“Critical Applications”).
TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, INTENDED, AUTHORIZED, OR WARRANTED
TO BE SUITABLE FOR USE IN LIFE-SUPPORT APPLICATIONS, DEVICES OR SYSTEMS OR OTHER
CRITICAL APPLICATIONS.
Inclusion of TI products in such applications is understood to be fully at the risk of the customer. Use of TI
products in such applications requires the written approval of an appropriate TI officer. Questions concerning
potential risk applications should be directed to TI through a local SC sales office.
In order to minimize risks associated with the customer’s applications, adequate design and operating
safeguards should be provided by the customer to minimize inherent or procedural hazards.
TI assumes no liability for applications assistance, customer product design, software performance, or
infringement of patents or services described herein. Nor does TI warrant or represent that any license, either
express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property
right of TI covering or relating to any combination, machine, or process in which such semiconductor products
or services might be or are used.
Copyright  1995, Texas Instruments Incorporated
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