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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
4 _______________________________________________________________________________________
__________________________________________Typical Operating Characteristics
(V
CC
= +3.3V, 235kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ, T
A
= +25°C, unless otherwise noted.)
-6
-5
-4
-3
-2
-1
0
1
2
3
4
5
6
0
MAX3222/MAX3232
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3222-01
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE (V)
2000 30001000 4000 5000
V
OUT
+
V
OUT
-
0
2
4
6
8
10
12
14
16
18
20
22
150
MAX3222/MAX3232
SLEW RATE
vs. LOAD CAPACITANCE
MAX3222-02
LOAD CAPACITANCE (pF)
SLEW RATE (V/µs)
2000 30001000 4000 5000
FOR DATA RATES UP TO 235kbps
+SLEW
-SLEW
0
5
10
15
20
25
30
35
40
0
MAX3222/MAX3232
SUPPLY CURRENT vs. LOAD CAPACITANCE
WHEN TRANSMITTING DATA
MAX3222-03
LOAD CAPACITANCE (pF)
SUPPLY CURRENT (mA)
2000 30001000 4000 5000
235kbps
120kbps
20kbps
R
L
= 3kΩ, C
L
= 1000pF, one transmitter switching,
MBAUD = GND
Normal operation
CONDITIONS
Normal operation ns200Receiver Output Disable Time
| t
PHL
- t
PLH
|, MBAUD = GND
ns100
0.15
250
µs
0.15
Receiver Propagation Delay
ns200Receiver Output Enable Time
UNITS
MIN TYP MAX
PARAMETER
TIMING CHARACTERISTICS—MAX3237
(V
CC
= +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
V
CC
= 3.0V to 4.5V, R
L
= 3kΩ, C
L
= 250pF,
one transmitter switching, MBAUD = V
CC
1000
V
CC
= 4.5V to 5.5V, R
L
= 3kΩ, C
L
= 1000pF,
one transmitter switching, MBAUD = V
CC
kbps
1000
Maximum Data Rate
R_IN to R_OUT, C
L
= 150pF
| t
PHL
- t
PLH
|, MBAUD = V
CC
ns25
Transmitter Skew
| t
PHL
- t
PLH
|
ns50Receiver Skew
630
V/µs
430
t
PHL
t
PLH
C
L
= 150pF to 2500pF,
MBAUD = GND
C
L
= 150pF
to 1000pF
MBAUD =
GND
V
CC
= 3.3V, R
L
= 3Ω to 7kΩ,
+3V to -3V or -3V to +3V,
T
A
= +25°C
Transition-Region Slew Rate
MBAUD =
V
CC
24 150
Note 2: MAX3222/MAX3232/MAX3241: C1–C4 = 0.1µF tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF tested at 5.0V ±10%.
MAX3237: C1–C4 = 0.1µF tested at 3.3V ±5%; C1–C4 = 0.22µF tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF tested
at 5.0V ±10%.
Note 3: Transmitter input hysteresis is typically 250mV.
MAX3222/MAX3232/MAX3237/MAX3241
3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232
Transceivers Using Four 0.1µF External Capacitors
_______________________________________________________________________________________
5
-7.5
-5.0
-2.5
0
2.5
5.0
7.5
0
MAX3241
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3222-04
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE (V)
2000 30001000 4000 5000
V
OUT
+
1 TRANSMITTER AT 235kbps
2 TRANSMITTERS AT 30kbps
V
OUT
-
ALL OUTPUTS LOADED WITH 3kΩ +C
L
0.1µF CHARGE-PUMP CAPACITORS
FOR ALL DATA RATES UP TO 235kbps
4
6
8
10
12
14
16
18
20
22
24
0
MAX3241
SLEW RATE
vs. LOAD CAPACITANCE
MAX3222-05
LOAD CAPACITANCE (pF)
SLEW RATE (V/µs)
2000 30001000 4000 5000
+SLEW
-SLEW
0
5
10
15
20
25
30
35
45
40
0
MAX3241
SUPPLY CURRENT vs. LOAD
CAPACITANCE WHEN TRANSMITTING DATA
MAX3222-06
LOAD CAPACITANCE (pF)
SUPPLY CURRENT (mA)
2000 30001000 4000 5000
235kbps
120kbps
20kbps
-7.5
-5.0
-2.5
0
2.5
5.0
7.5
0
MAX3237
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE (MBAUD = GND)
MAX3222-07
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE (V)
2000 30001000 4000 5000
1 TRANSMITTER AT 240kbps
4 TRANSMITTERS AT 15kbps
3kΩ + C
L
LOADS
V
CC
= 3.3V
0
10
20
30
50
40
60
70
0
MAX3237
SLEW RATE vs. LOAD CAPACITANCE
(MBAUD = V
CC
)
MAX3222-10
LOAD CAPACITANCE (pF)
SLEW RATE (V/µs)
500 1000 1500 2000
-SLEW, 1Mbps
+SLEW, 1Mbps
1 TRANSMITTER AT FULL DATA RATE
4 TRANSMITTERS AT 1/16 DATA RATE
3kΩ + C
L
LOAD EACH OUTPUT
V
CC
= 3.3V
-SLEW, 2Mbps
+SLEW, 2Mbps
-7.5
-5.0
-2.5
0
2.5
5.0
7.5
0
MAX3237
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE (MBAUD = V
CC
)
MAX3222-08
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE (V)
500 1000 1500 2000
1 TRANSMITTER AT FULL DATA RATE
4 TRANSMITTERS AT 1/16 DATA RATE
3kΩ + C
L
LOAD, EACH OUTPUT
V
CC
= 3.3V
2Mbps
1.5Mbps
1Mbps
2Mbps
1Mbps
1.5Mbps
0
10
20
30
40
50
60
0
MAX3237
SUPPLY CURRENT vs.
LOAD CAPACITANCE (MBAUD = GND)
MAX3222-11
LOAD CAPACITANCE (pF)
SUPPLY CURRENT (mA)
2000 30001000 4000 5000
240kbps
120kbps
20kbps
1 TRANSMITTER AT FULL DATA RATE
4 TRANSMITTERS AT 1/16 DATA RATE
3kΩ + C
L
LOADS
V
CC
= 3.3V
0
2
4
6
8
10
12
0
MAX3237
SLEW RATE vs. LOAD CAPACITANCE
(MBAUD = GND)
MAX3222-09
LOAD CAPACITANCE (pF)
SLEW RATE (V/µs)
2000 30001000 4000 5000
+SLEW
-SLEW
1 TRANSMITTER AT 240kbps
4 TRANSMITTERS AT 15kbps
3kΩ + C
L
LOADS
V
CC
= 3.3V
_____________________________Typical Operating Characteristics (continued)
(V
CC
= +3.3V, 235kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ, T
A
= +25°C, unless otherwise noted.)
MAX3222/MAX3232/MAX3237/MAX3241
3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232
Transceivers Using Four 0.1µF External Capacitors
6 _______________________________________________________________________________________
—
FUNCTION
—
MAX3222
Noninverting Complementary Receiver Outputs.
Always active.
DIP/SO SSOP
— 11, 14
1 1 Receiver Enable. Active low.
2 2
Positive Terminal of Voltage-Doubler Charge-Pump
Capacitor
6 6
Negative Terminal of Inverting Charge-Pump
Capacitor
5 5
Positive Terminal of Inverting Charge-Pump
Capacitor
4 4
Negative Terminal of Voltage-Doubler Charge-Pump
Capacitor
3 3 +5.5V Generated by the Charge Pump
11, 12 12, 13 TTL/CMOS Transmitter Inputs
10, 13 10, 15 TTL/CMOS Receiver Outputs
9, 14 9, 16 RS-232 Receiver Inputs
8, 15 8, 17 RS-232 Transmitter Outputs
7 7 -5.5V Generated by the Charge Pump
18 20 Shutdown Control. Active low.
17 19 +3.0V to +5.5V Supply Voltage
16 18 Ground
No Connection
MAX3237MAX3232
— 16
— 13
1 28
5 3
4 1
3 25
2 27
10, 11
17, 19, 22,
23, 24
9, 12 18, 20, 21
8, 13 8, 9, 11
7, 14
5, 6, 7,
10, 12
6 4
— 14
16 26
15 2
— —
NAME
EN
C1+
C2-
C2+
C1-
V+
T_IN
R_OUT
R_IN
T_OUT
V-
SHDN
V
CC
GND
R_OUTB
N.C.
MAX3241
20, 21
23
28
2
1
24
27
12, 13, 14
15–19
4–8
9, 10, 11
3
22
26
25
—
PIN
— —
MegaBaud Control Input. Connect to GND for normal
operation; connect to V
CC
for 1Mbps transmission rates.
— 15 MBAUD—
______________________________________________________________Pin Description
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

103030028

Mfr. #:
Buy 103030028
Manufacturer:
Seeed Studio
Description:
Interface Development Tools Raspberry Pi RS232 Board v1.0
Lifecycle:
New from this manufacturer.
Delivery:
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