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PDF MAX3232E Data sheet ( Hoja de datos )
| Número de pieza | MAX3232E | |
| Descripción | 15kV ESD-Protected / Down to 10nA / 3.0V to 5.5V / Up to 1Mbps / True RS-232 Transceivers | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-1298; Rev 3a; 1/00
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
________________General Description ____________________________Features
The MAX3222E/MAX3232E/MAX3237E/MAX3241E are
3V-powered EIA/TIA-232 and V.28/V.24 communications
interfaces with low power requirements, high data-
rate capabilities, and enhanced electrostatic discharge
(ESD) protection. All transmitter outputs and receiver
inputs are protected to ±15kV using IEC 1000-4-2 Air-
Gap Discharge, ±8kV using IEC 1000-4-2 Contact Dis-
charge, and ±15kV using the Human Body Model. The
MAX3237E’s logic and receiver I/O pins are protected to
the above standards, while the transmitter output pins are
protected to ±15kV using the Human Body Model.
The transceivers have a proprietary low-dropout transmit-
ter output stage, delivering true RS-232 performance from
a +3.0V to +5.5V supply with a dual charge pump. The
charge pump requires only four small 0.1µF capacitors
for operation from a +3.3V supply. Each device is guaran-
teed to run at data rates of 250kbps while maintaining RS-
232 output levels. The MAX3237E is guaranteed to run at
data rates of 250kbps in the normal operating mode and
1Mbps in the MegaBaud™ operating mode while main-
taining RS-232-compliant output levels.
The MAX3222E/MAX3232E have two receivers and two
drivers. The MAX3222E features a 1µA shutdown mode
that reduces power consumption and extends battery
life in portable systems. Its receivers can remain active
in shutdown mode, allowing external devices such as
modems to be monitored using only 1µA supply current.
Both the MAX3222E and MAX3232E are pin, package,
and functionally compatible with the industry-standard
MAX242 and MAX232, respectively.
The MAX3241E is a complete serial port (three drivers/five
receivers) designed for notebook and subnotebook com-
puters. The MAX3237E (five drivers/three receivers) is ideal
for peripheral applications that require fast data transfer.
Both devices feature a shutdown mode in which all
receivers can remain active while using a supply cur-
rent of only 1µA (MAX3241E) or 10nA (MAX3237E). The
MAX3237E/MAX3241E have additional receiver outputs
that always remain active.
The MAX3222E and MAX3232E are available in space-
saving SO, SSOP, and TSSOP packages. The MAX3241E
is available in SO and SSOP packages. The MAX3237E is
available in an SSOP package.
o ESD Protection for RS-232 I/O Pins
(MAX3222E/MAX3232E/MAX3241E)
±15kV—Human Body Model
±8kV—IEC 1000-4-2, Contact Discharge
±15kV—IEC 1000-4-2, Air-Gap Discharge
o ESD Protection for All Logic and Receiver I/O
Pins (MAX3237E)
±15kV—Human Body Model
±8kV—IEC 1000-4-2, Contact Discharge
±15kV—IEC 1000-4-2, Air-Gap Discharge
o ESD Protection for Transmitter Output Pins
(MAX3237E)
±15kV—Human Body Model
o Guaranteed Data Rate
250kbps (MAX3222E/MAX3232E/MAX3241E
and MAX3237E, normal operation)
1Mbps (MAX3237E, MegaBaud operation)
o Latchup Free
o Low-Power Shutdown with Receivers Active
1µA (MAX3222E/MAX3241E)
10nA (MAX3237E)
o Flow-Through Pinout (MAX3237E)
o Guaranteed Mouse Driveability (MAX3241E)
o Meets EIA/TIA-232 Specifications Down to 3.0V
_______________Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX3222ECUP 0°C to +70°C
20 TSSOP
MAX3222ECAP
0°C to +70°C
20 SSOP
Ordering Information continued at end of data sheet.
___________________________Selector Guide
PART
MAX3222E
MAX3232E
MAX3237E
(Normal)
NO. OF
DRIVERS/
RECEIVERS
2/2
2/2
5/3
LOW-
POWER
SHUTDOWN
✔
—
GUARANTEED
DATA RATE
(kbps)
250
250
✔ 250
________________________Applications
Notebooks, Subnotebooks, Smart Phones
and Palmtop Computers
XDSL Modems
Battery-Powered Equipment Printers
Cell-Phone Data Cables
Cell Phones
MAX3237E
(MegaBaud)
MAX3241E
5/3
3/5
✔
✔
1M
250
Pin Configurations appear at end of data sheet.
Typical Operating Circuits appear at end of data sheet.
MegaBaud is a trademark of Maxim Integrated Products.
†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.
________________________________________________________________ Maxim Integrated Products 1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
1 page  
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
Typical Operating Characteristics (continued)
(VCC = +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ and CL, TA = +25°C, unless otherwise noted.)
MAX3241E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
6
5
4
VOUT+
3
1 TRANSMITTER AT 250kbps
2 2 TRANSMITTERS AT 15.6kbps
1
0
-1
-2
-3
-4
-5
VOUT-
-6
0
1000 2000 3000 4000 5000
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
6
5
4
VOUT+
3
2 FOR DATA RATES UP TO 250kbps
1 1 TRANSMITTER 250kbps
0 4 TRANSMITTERS 15.6kbps
-1 ALL TRANSMITTERS LOADED
-2 WITH 3kΩ + CL
-3
-4
-5 VOUT-
-6
0 500 1000 1500 2000 2500 300
LOAD CAPACITANCE (pF)
MAX3237E
SLEW RATE vs. LOAD CAPACITANCE
(MBAUD = VCC)
70
60
-SLEW, 1Mbps
50 +SLEW, 1Mbps
-SLEW, 2Mbps
40 +SLEW, 2Mbps
MAX3241E
SLEW RATE vs. LOAD CAPACITANCE
14
12
10
8
6
4
2
0
0 1000 2000 3000 4000 5000
LOAD CAPACITANCE (pF)
MAX3237E
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
-2.5
2Mbps
1.5Mbps
-5.0
1Mbps
-7.5
0
500 1000 1500
LOAD CAPACITANCE (pF)
2000
MAX3237E
SUPPLY CURRENT vs. LOAD CAPACITANCE
WHEN TRANSMITTING DATA (MBAUD = GND)
50
250kbps
40 120kbps
20kbps
30
MAX3241E
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
60
1 TRANSMITTER AT 250kbps
50 2 TRANSMITTERS AT 15.6kbps
250kbps
40
120kbps
30
20kbps
20
10
0
0
1000 2000 3000 4000
LOAD CAPACITANCE (pF)
5000
MAX3237E
SLEW RATE vs. LOAD CAPACITANCE
(MBAUD = GND)
12
10
SR-
8
SR+
6
4
1 TRANSMITTER AT 250kbps
4 TRANSMITTERS 15.6kbps
2 ALL TRANSMITTERS LOADED
WITH 3kΩ + CL
0
0 500 1000 1500 2000 2500
LOAD CAPACITANCE (pF)
3000
MAX3237E
TRANSMITTER SKEW vs. LOAD CAPACITANCE
(MBAUD = VCC)
100
80
60
30
20
1 TRANSMITTER AT FULL DATA RATE
10
4 TRANSMITTERS AT 1/16 DATA RATE
3kΩ + CL LOAD EACH OUTPUT
0
0 500 1000 1500
LOAD CAPACITANCE (pF)
2000
20
1 TRANSMITTER AT 20kbps, 120kbps, 250kbps
10
4 TRANSMITTERS AT 15.6kbps
ALL TRANSMITTERS LOADED
WITH 3kΩ + CL
0
0
500 1000 1500 2000 2500 3000
LOAD CAPACITANCE (pF)
40
|tPLH - tPHL|
20 1 TRANSMITTER AT 500kbps
4 TRANSMITTERS AT 1/16 DATA RATE
ALL TRANSMITTERS LOADED
0 WITH 3kΩ + CL
0 500 1000 1500
LOAD CAPACITANCE (pF)
2000
_______________________________________________________________________________________ 5
5 Page 
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
Table 2. Required Minimum Capacitor
Values
VCC C1 C2, C3, C4
(V) (µF)
(µF)
MAX3222E/MAX3232E/MAX3241E
3.0 to 3.6
0.1
4.5 to 5.5
0.047
3.0 to 5.5
0.1
MAX3237E
3.0 to 3.6
0.22
3.15 to 3.6
0.1
4.5 to 5.5
0.047
3.0 to 5.5
0.22
0.1
0.33
0.47
0.22
0.1
0.33
1.0
___________Applications Information
Capacitor Selection
The capacitor type used for C1–C4 is not critical for
proper operation; polarized or nonpolarized capacitors
can be used. The charge pump requires 0.1µF capaci-
tors for 3.3V operation. For other supply voltages, see
Table 2 for required capacitor values. Do not use val-
ues smaller than those listed in Table 2. Increasing the
capacitor values (e.g., by a factor of 2) reduces ripple
on the transmitter outputs and slightly reduces power
consumption. C2, C3, and C4 can be increased without
changing C1’s value. However, do not increase C1
without also increasing the values of C2, C3, C4,
and CBYPASS to maintain the proper ratios (C1 to
the other capacitors).
When using the minimum required capacitor values,
make sure the capacitor value does not degrade
excessively with temperature. If in doubt, use capaci-
tors with a larger nominal value. The capacitor’s equiv-
alent series resistance (ESR), which usually rises at low
temperatures, influences the amount of ripple on V+
and V-.
Power-Supply Decoupling
In most circumstances, a 0.1µF VCC bypass capacitor
is adequate. In applications that are sensitive to power-
supply noise, use a capacitor of the same value as
charge-pump capacitor C1. Connect bypass capaci-
tors as close to the IC as possible.
Operation Down to 2.7V
Transmitter outputs will meet EIA/TIA-562 levels of
±3.7V with supply voltages as low as 2.7V.
6
5
4
3 VCC = 3.0V
VOUT+
2
1 VOUT+
0
-1
-2
-3 VCC
-4
VOUT-
VOUT-
-5
-6
0 1 2 3 4 5 6 7 8 9 10
LOAD CURRENT PER TRANSMITTER (mA)
Figure 6a. MAX3241E Transmitter Output Voltage vs. Load
Current per Transmitter
Transmitter Outputs when
Recovering from Shutdown
Figure 3 shows two transmitter outputs when recover-
ing from shutdown mode. As they become active, the
two transmitter outputs are shown going to opposite
RS-232 levels (one transmitter input is high, the other is
low). Each transmitter is loaded with 3kΩ in parallel with
2500pF. The transmitter outputs display no ringing or
undesirable transients as they come out of shutdown.
Note that the transmitters are enabled only when the
magnitude of V- exceeds approximately -3V.
Mouse Driveability
The MAX3241E has been specifically designed to
power serial mice while operating from low-voltage
power supplies. It has been tested with leading mouse
brands from manufacturers such as Microsoft and
Logitech. The MAX3241E successfully drove all serial
mice tested and met their respective current and volt-
age requirements. Figure 6a shows the transmitter out-
put voltages under increasing load current at 3.0V.
Figure 6b shows a typical mouse connection using the
MAX3241E.
High Data Rates
The MAX3222E/MAX3232E/MAX3237E/MAX3241E
maintain the RS-232 ±5.0V minimum transmitter output
voltage even at high data rates. Figure 7 shows a trans-
mitter loopback test circuit. Figure 8 shows a loopback
test result at 120kbps, and Figure 9 shows the same test
at 250kbps. For Figure 8, all transmitters were driven
simultaneously at 120kbps into RS-232 loads in parallel
with 1000pF. For Figure 9, a single transmitter was driv-
en at 250kbps, and all transmitters were loaded with an
RS-232 receiver in parallel with 1000pF.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet MAX3232E.PDF ] | |
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