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PDF MAX3232 Data sheet ( Hoja de datos )

Número de pieza MAX3232
Descripción 3.0V to 5.5V / Low-Power / up to 1Mbps / True RS-232 Transceivers Using Four 0.1F External Capacitors
Fabricantes Maxim Integrated　
Logotipo Maxim Integrated Logotipo

max3232-transceiver


1. True RS-232 Transceiver - Maxim






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EVALUATION KIT AVAILABLE
MAX3222/MAX3232/
MAX3237/MAX3241*
3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232
Transceivers Using Four 0.1µF External Capacitors
________________General Description
The MAX3222/MAX3232/MAX3237/MAX3241 trans-
ceivers have a proprietary low-dropout transmitter out-
put stage enabling true RS-232 performance from a
3.0V to 5.5V supply with a dual charge pump. The
devices require only four small 0.1µF external charge-
pump capacitors. The MAX3222, MAX3232, and
MAX3241 are guaranteed to run at data rates of
120kbps while maintaining RS-232 output levels. The
MAX3237 is guaranteed to run at data rates of 250kbps
in the normal operating mode and 1Mbps in the
MegaBaud™ operating mode, while maintaining RS-232
output levels.
The MAX3222/MAX3232 have 2 receivers and 2
drivers. The MAX3222 features a 1µA shutdown mode
that reduces power consumption and extends battery
life in portable systems. Its receivers remain active in
shutdown mode, allowing external devices such as
modems to be monitored using only 1µA supply cur-
rent. The MAX3222 and MAX3232 are pin, package,
and functionally compatible with the industry-standard
MAX242 and MAX232, respectively.
The MAX3241 is a complete serial port (3 drivers/
5 receivers) designed for notebook and subnotebook
computers. The MAX3237 (5 drivers/3 receivers) is ideal
for fast modem applications. Both these devices feature
a shutdown mode in which all receivers can remain
active while using only 1µA supply current. Receivers R1
(MAX3237/MAX3241) and R2 (MAX3241) have extra out-
puts in addition to their standard outputs. These extra
outputs are always active, allowing external devices
such as a modem to be monitored without forward bias-
ing the protection diodes in circuitry that may have VCC
completely removed.
The MAX3222, MAX3232, and MAX3241 are available
in space-saving TSSOP and SSOP packages.
________________________Applications
Notebook, Subnotebook, and Palmtop Computers
High-Speed Modems
Battery-Powered Equipment
Hand-Held Equipment
Peripherals
Printers
__Next Generation Device Features
o For Smaller Packaging:
MAX3228E/MAX3229E: +2.5V to +5.5V RS-232
Transceivers in UCSP™
o For Integrated ESD Protection:
MAX3222E/MAX3232E/MAX3237E/MAX3241E*/
MAX3246E: ±15kV ESD-Protected, Down to 10nA,
3.0V to 5.5V, Up to 1Mbps, True RS-232
Transceivers
o For Low-Voltage or Data Cable Applications:
MAX3380E/MAX3381E: +2.35V to +5.5V, 1µA,
2Tx/2Rx RS-232 Transceivers with ±15kV
ESD-Protected I/O and Logic Pins
_______________Ordering Information
PART
TEMP RANGE
MAX3222CUP+ 0°C to +70°C
MAX3222CAP+ 0°C to +70°C
MAX3222CWN+ 0°C to +70°C
MAX3222CPN+ 0°C to +70°C
+Denotes lead-free package.
PIN-PACKAGE
PKG
CODE
20 TSSOP
U20+2
20 SSOP
A20+1
18 SO
W18+1
18 Plastic Dip P18+5
Ordering Information continued at end of data sheet.
_________________Pin Configurations
TOP VIEW
+
EN 1
C1+ 2
V+ 3
C1- 4
C2+ 5
MAX3222
C2- 6
V- 7
T2OUT 8
R2IN 9
18 SHDN
17 VCC
16 GND
15 T1OUT
14 R1IN
13 R1OUT
12 T1IN
11 T2IN
10 R2OUT
Typical Operating Circuits appear at end of data sheet.
DIP/SO
Pin Configurations continued at end of data sheet.
MegaBaud and UCSP are trademarks of Maxim Integrated Products, Inc.
*Covered by U.S. Patent numbers 4,636,930; 4,679,134; 4,777,577; 4,797,899; 4,809,152; 4,897,774; 4,999,761; and other patents pending.
For pricing, delivery, and ordering information, please contact Maxim Direct at
1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
19-0273; Rev 7; 1/07

1 page




MAX3232 pdf
MAX3222/MAX3232/MAX3237/MAX3241
3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232
Transceivers Using Four 0.1µF External Capacitors
_____________________________Typical Operating Characteristics (continued)
(VCC = +3.3V, 235kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ, TA = +25°C, unless otherwise noted.)
MAX3241
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
7.5
VOUT+
5.0
2.5
1 TRANSMITTER AT 235kbps
2 TRANSMITTERS AT 30kbps
0
-2.5
-5.0 VOUT-
-7.5
0
1000 2000 3000 4000
LOAD CAPACITANCE (pF)
5000
MAX3237
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE (MBAUD = GND)
7.5
5.0
2.5
1 TRANSMITTER AT 240kbps
4 TRANSMITTERS AT 15kbps
0 3kΩ + CL LOADS
VCC = 3.3V
-2.5
-5.0
-7.5
0
1000 2000 3000 4000 5000
LOAD CAPACITANCE (pF)
MAX3237
SLEW RATE vs. LOAD CAPACITANCE
(MBAUD = VCC)
70
60
-SLEW, 1Mbps
50 +SLEW, 1Mbps
-SLEW, 2Mbps
40 +SLEW, 2Mbps
30
MAX3241
SLEW RATE
vs. LOAD CAPACITANCE
24
22
20
18
-SLEW
16
14
12
+SLEW
10
8 ALL OUTPUTS LOADED WITH 3kΩ +CL
6 0.1μF CHARGE-PUMP CAPACITORS
4 FOR ALL DATA RATES UP TO 235kbps
0 1000 2000 3000 4000
LOAD CAPACITANCE (pF)
5000
MAX3237
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE (MBAUD = VCC)
7.5
1Mbps
5.0
2Mbps
1.5Mbps
2.5
1 TRANSMITTER AT FULL DATA RATE
4 TRANSMITTERS AT 1/16 DATA RATE
0 3kΩ + CL LOAD, EACH OUTPUT
VCC = 3.3V
-2.5
2Mbps
1.5Mbps
-5.0
1Mbps
-7.5
0
500 1000 1500
LOAD CAPACITANCE (pF)
2000
MAX3237
SUPPLY CURRENT vs.
LOAD CAPACITANCE (MBAUD = GND)
60
50 240kbps
40 120kbps
30
20kbps
MAX3241
SUPPLY CURRENT vs. LOAD
CAPACITANCE WHEN TRANSMITTING DATA
45
235kbps
40
35
30 120kbps
25
20
20kbps
15
10
5
0
0
1000 2000 3000 4000 5000
LOAD CAPACITANCE (pF)
MAX3237
SLEW RATE vs. LOAD CAPACITANCE
(MBAUD = GND)
12
10 -SLEW
+SLEW
8
6
4
1 TRANSMITTER AT 240kbps
2
4 TRANSMITTERS AT 15kbps
3kΩ + CL LOADS
VCC = 3.3V
0
0 1000 2000 3000 4000
LOAD CAPACITANCE (pF)
MAX3237
SKEW vs. LOAD CAPACITANCE
(tPLH - tPHL)
70
1 TRANSMITTER AT 512kbps
60 4 TRANSMITTERS AT 32kbps
3kΩ + CL LOADS
50
VCC = 3.3V
MBAUD = VCC
5000
40 MAX
AVERAGE; 10 PARTS
30
20
1 TRANSMITTER AT FULL DATA RATE
10
4 TRANSMITTERS AT 1/16 DATA RATE
3kΩ + CL LOAD EACH OUTPUT
0 VCC = 3.3V
0 500 1000 1500
LOAD CAPACITANCE (pF)
2000
20
1 TRANSMITTER AT FULL DATA RATE
10
4 TRANSMITTERS AT 1/16 DATA RATE
3kΩ + CL LOADS
VCC = 3.3V
0
0 1000 2000 3000 4000
LOAD CAPACITANCE (pF)
5000
20
10
0
0
MIN
500 1000 1500 2000
LOAD CAPACITANCE (pF)
2500
Maxim Integrated
5

5 Page





MAX3232 arduino
MAX3222/MAX3232/MAX3237/MAX3241
3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232
Transceivers Using Four 0.1µF External Capacitors
VCC
0.1μF
C1+
C1
C1-
C2+
C2
C2-
T_ IN
VCC
MAX3222
MAX3232
MAX3237
MAX3241
V+
V-
T_ OUT
R_ OUT
0V EN*
R_ IN
5kΩ
VCC SHDN*
GND
*MAX3222/MAX3237/MAX3241 ONLY
C3
C4
1000pF
T1IN
T1OUT
R1OUT
5V/div
5V/div
5V/div
VCC = 3.3V
5μs/div
Figure 6. MAX3241 Loopback Test Result at 120kbps
T1IN
T1OUT
R1OUT
5V/div
5V/div
5V/div
Figure 5. Loopback Test Circuit
High Data Rates
The MAX3222/MAX3232/MAX3241 maintain the RS-232
±5.0V minimum transmitter output voltage even at high
data rates. Figure 5 shows a transmitter loopback test
circuit. Figure 6 shows a loopback test result at
120kbps, and Figure 7 shows the same test at 235kbps.
For Figure 6, all transmitters were driven simultaneously
at 120kbps into RS-232 loads in parallel with 1000pF.
For Figure 7, a single transmitter was driven at 235kbps,
and all transmitters were loaded with an RS-232 receiver
in parallel with 1000pF.
The MAX3237 maintains the RS-232 ±5.0V minimum
transmitter output voltage at data rates up to 1Mbps.
Figure 8 shows a loopback test result at 1Mbps with
MBAUD = VCC. For Figure 8, all transmitters were
loaded with an RS-232 receiver in parallel with 250pF.
VCC = 3.3V
2μs/div
Figure 7. MAX3241 Loopback Test Result at 235kbps
+5V
0V
+5V
0V
-5V
+5V
0V
VCC = 3.3V
200ns/div
T_IN
T_OUT = R_IN
5kΩ + 250pF
R_OUT
150pF
Figure 8. MAX3237 Loopback Test Result at 1000kbps
(MBAUD = VCC)
Maxim Integrated
11

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