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MAX3232CPE Datasheet(PDF) 11 Page - Maxim Integrated Products

Part No. MAX3232CPE
Description  3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232 Transceivers Using Four 0.1uF External Capacitors
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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 11 page
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3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232
Transceivers Using Four 0.1µF External Capacitors
______________________________________________________________________________________
11
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.
MAX3222
MAX3232
MAX3237
MAX3241
5k
R_ IN
R_ OUT
EN
*
C2-
C2+
C1-
C1+
V-
V+
VCC
C4
C3
C1
C2
0.1
µF
VCC
SHDN
*
T_ OUT
T_ IN
GND
VCC
0V
1000pF
* MAX3222/MAX3241 ONLY
T1IN
R1OUT
VCC = 3.3V
T1OUT
5V/div
5V/div
5V/div
5
µs/div
Figure 5. Loopback Test Circuit
Figure 6. MAX3241 Loopback Test Result at 120kbps
T1IN
R1OUT
VCC = 3.3V
T1OUT
5V/div
5V/div
2
µs/div
5V/div
Figure 7. MAX3241 Loopback Test Result at 235kbps
+5V
0V
+5V
0V
-5V
+5V
0V
T_IN
T_OUT = R_IN
5k + 250pF
R_OUT
150pF
200ns/div
VCC = 3.3V
Figure 8. MAX3237 Loopback Test Result at 1000kbps
(MBAUD = VCC)




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