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103030028

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
MAX3222/MAX3232/MAX3237/MAX3241
3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232
Transceivers Using Four 0.1µF External Capacitors
10 ______________________________________________________________________________________
MAX3241
EN
23
R5OUT
15
R4OUT
16
R3OUT
17
R2OUT
18
R1OUT
19
R2OUTB
20
R1OUTB
21
5k
5k
5k
5k
5k
R5IN 8
R4IN
7
6
R2IN 5
R1IN 4
SHDN
22
GND
25
T3IN
12
T2IN
13
T1IN
14
C2-
2
C2+
1
C1-
24
C1+
28
T3OUT
11
+V
COMPUTER SERIAL PORT
MOUSE
+V
-V
GND
Tx
T2OUT
10
T1OUT
9
V-
3
V+
27
V
CC
V
CC
C4
C3 C
1
C
2
0.1µF
V
CC
= 3V
to 5.5V
26
R3IN
Figure 4b. Mouse Driver Test Circuit
-6
-5
-4
-3
-2
-1
0
1
2
3
4
5
6
01234567
MAX3222-04
LOAD CURRENT PER TRANSMITTER (mA)
TRANSMITTER OUTPUT VOLTAGE (V)
V
OUT
+
V
CC
= 3.0V
V
OUT
-
V
OUT
+
V
CC
V
OUT
-
T1
T2
T3
Figure 4a. MAX3241 Transmitter Output Voltage vs. Load Current per Transmitter
MAX3222/MAX3232/MAX3237/MAX3241
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 = V
CC
. 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+
V
CC
C4
C3
C1
C2
0.1µF
V
CC
SHDN*
T_ OUT
T_ IN
GND
V
CC
0V
1000pF
* MAX3222/MAX3241 ONLY
T1IN
R1OUT
V
CC
= 3.3V
T1OUT
5V/div
5V/div
5V/div
5
µ
s/div
Figure 5. Loopback Test Circuit
Figure 6. MAX3241 Loopback Test Result at 120kbps
T1IN
R1OUT
V
CC
= 3.3V
T1OUT
5V/div
5V/div
2µs/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
V
CC
= 3.3V
Figure 8. MAX3237 Loopback Test Result at 1000kbps
(MBAUD = V
CC
)
MAX3222/MAX3232/MAX3237/MAX3241
3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232
Transceivers Using Four 0.1µF External Capacitors
12 ______________________________________________________________________________________
__________________________________________________Typical Operating Circuits
MAX3222
R2OUT10
1
R1OUT13
R2IN
9
18
GND
16
RS-232
OUTPUTS
TTL/CMOS
INPUTS
T2IN
11
T1IN
12
C2-
6
C2+
5
C1-
4
C1+
2
R1IN
14
T2OUT
8
T1OUT
15
V-
7
V+
3
V
CC
17
C1
0.1µF
C2
0.1µF
0.1µF
+3.3V
RS-232
INPUTS
TTL/CMOS
OUTPUTS
5k
5k
EN
SHDN
C3*
0.1µF
C4
0.1µF
PIN NUMBERS REFER TO DIP/SO PACKAGES.
* C3 CAN BE RETURNED TO EITHER V
CC
OR GROUND.
MAX3232
R2OUT9
R1OUT12
R2IN
8
GND
15
RS-232
OUTPUTS
TTL/CMOS
INPUTS
T2IN
10
T1IN
11
C2-
5
C2+
4
C1-
3
C1+
1
R1IN
13
T2OUT
7
T1OUT
14
V-
6
V+
2
V
CC
C4
0.1µF
16
0.1µF
0.1µF
0.1µF
+3.3V
RS-232
INPUTS
TTL/CMOS
OUTPUTS
C3*
0.1µF
5k
5k
* C3 CAN BE RETURNED TO EITHER V
CC
OR GROUND.
SEE TABLE 2 FOR CAPACITOR SELECTION
Interconnection with 3V and 5V Logic
The MAX3222/MAX3232/MAX3237/MAX3241 can
directly interface with various 5V logic families, includ-
ing ACT and HCT CMOS. See Table 3 for more informa-
tion on possible combinations of interconnections.
Table 3. Logic-Family Compatibility
with Various Supply Voltages
Compatible with ACT and
HCT CMOS, and with TTL.
Incompatible with AC, HC,
and CD4000 CMOS.
3.35
SYSTEM
POWER-
SUPPLY
VOLTAGE
(V)
Compatible with all TTL
and CMOS-logic families.
55
Compatible with all CMOS
families.
3.33.3
COMPATIBILITY
MAX32_ _
V
CC
SUPPLY
VOLTAGE
(V)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

103030028

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Manufacturer:
Seeed Studio
Description:
Interface Development Tools Raspberry Pi RS232 Board v1.0
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