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MAX232 Schematic ( PDF Datasheet ) - Maxim Integrated
| Teilenummer | MAX232 |
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| Beschreibung | Multichannel RS-232 Drivers/Receivers | |
| Hersteller | Maxim Integrated | |
| Logo |  |
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Gesamt 30 Seiten 
MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
General Description
The MAX220–MAX249 family of line drivers/receivers is
intended for all EIA/TIA-232E and V.28/V.24 communica-
tions interfaces, particularly applications where ±12V is
not available.
The MAX225, MAX233, MAX235, and MAX245/MAX246/
MAX247 use no external components and are
recommended for applications where printed circuit
board space is critical.
The MAX220-MAX249 are offered in 26 different pack-
ages with temperatures from 0 to +70°C up to -55°C to
+125°C. See ordering information table at the end of the
data sheet for all package and temperature options.
Applications
• Interface Translation
• Multidrop RS-232 Networks
• Portable Diagnostics Equipment
AutoShutdown and UCSP are trademarks of Maxim Integrated
Products, Inc.
Benefits and Features
Saves Board Space
• Integrated Charge Pump Circuitry
• Eliminates the Need for a Bipolar ±12V Supply
• Enables Single Supply Operation from +5V Supply
• Integrated Capacitors (MAX223, MAX233, MAX235,
MAX245-MAX247)
Saves Power for Reduced Power Requirements
• 5µW Shutdown Mode
Ordering Information and Selection Table appears at end
of data sheet.
MAX220/MAX232/MAX232A Pin Configuration and Typical Operating Circuit
TOP VIEW
+
C1+ 1
V+ 2
C1- 3
C2+ 4
C2- 5
V- 6
MAX220
MAX232
MAX232A
T2OUT 7
R2IN 8
16 VCC
15 GND
14 T1OUT
13 R1IN
12 R1OUT
11 T1IN
10 T2IN
9 R2OUT
DIP/SO
CAPACITANCE (μF)
DEVICE C1 C2 C3 C4 C5
MAX220 0.047 0.33 0.33 0.33 0.33
MAX232 1.0 1.0 1.0 1.0 1.0
MAX232A 0.1 0.1 0.1 0.1 0.1
+5V INPUT C3
C1
C2
TTL/CMOS
INPUTS
C5
16
1 C1+
3 C1-
4 C2+
5 C2-
VCC
+5V TO +10V
VOLTAGE DOUBLER
+10V TO -10V
VOLTAGE INVERTER
V+ 2 +10V
V- 6 -10V
C4
+5V
400kΩ
11 T1IN
T1OUT 14
+5V
400kΩ
10 T2IN
T2OUT 7
RS-232
OUTPUTS
TTL/CMOS
OUTPUTS
12 R1OUT
9 R2OUT
R1IN 13
5kΩ
R2IN 8
5kΩ
GND
15
RS-232
INPUTS
19-4323; Rev 17; 1/15
 
MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Electrical Characteristics—MAX223/MAX230–MAX241 (continued)
(MAX223/230/232/234/236/237/238/240/241, VCC = +5V ±10%; MAX233/MAX235, VCC = +5V ±5%‚ C1–C4 = 1.0µF;
MAX231/MAX239, VCC = +5V ±10%; V+ = +7.5V to +13.2V; TA = TMIN to TMAX; unless otherwise noted.) (Note 5)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
RS-232 Input Logic-Low Voltage
TA = +25°C,
VCC = +5V
Normal operation
VSHDN = +5V (MAX223)
VSHDN = 0V (MAX235/236/240/241)
Shutdown (MAX223)
VSHDN = 0V,
VEN = +5V (R4IN, R5IN)
0.8
0.6
1.2
1.5
V
RS-232 Input Logic-High Voltage
TA = +25°C,
VCC = +5V
Normal operation
VSHDN = 5V (MAX223)
VSHDN = 0V (MAX235/236/240/241)
Shutdown (MAX223)
VSHDN = 0V,
VEN = +5V (R4IN‚ R5IN)
1.7 2.4
V
1.5 2.4
RS-232 Input Hysteresis
VCC = +5V, no hysteresis in shutdown
RS-232 Input Resistance
TA = +25°C, VCC = +5V
TTL/CMOS Output Voltage Low
IOUT = 1.6mA (MAX231/232/233, IOUT = 3.2mA)
TTL/CMOS Output Voltage High
IOUT = -1mA
TTL/CMOS Output Leakage Current
0V ≤ ROUT ≤ VCC; VEN = 0V (MAX223);
VEN = VCC (MAX235–241)
0.2 0.5 1.0
357
0.4
3.5 VCC - 0.4
±0.05 ±10
V
kΩ
V
V
µA
Receiver Output Enable Time
Normal
operation
MAX223
MAX235/236/239/240/241
600
ns
400
Receiver Output Disable Time
Normal
operation
MAX223
MAX235/236/239/240/241
900
ns
250
Propagation Delay
Transition Region Slew Rate
RS-232 IN to
Normal operation
TTL/CMOS OUT, VSHDN = 0V
CL = 150pF
(MAX223)
tPHLS
tPLHS
0.5 10
4 40 µs
6 40
MAX223/MAX230/MAX234–241, TA = +25°C, VCC = +5V,
RL = 3kΩ to 7kΩ‚ CL = 50pF to 2500pF, measured from
3
5.1
30
+3V to -3V or -3V to +3V
V/µs
MAX231/MAX232/MAX233, TA = +25°C, VCC = +5V,
RL = 3kΩ to 7kΩ, CL = 50pF to 2500pF, measured from
4 30
+3V to -3V or -3V to +3V
Transmitter Output Resistance
VCC = V+ = V- = 0V, VOUT = ±2V
300 Ω
Transmitter Output Short-Circuit
Current
±10 mA
mA
Note 5: All units are production tested at hot except for the MAX240, which is production tested at TA = +25°C. Specifications over
temperature are guaranteed by design.
www.maximintegrated.com
Maxim Integrated | 6
6 Page 
MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Control Pin Configuration Tables
Table 1a. MAX245 Control Pin Configurations
ENT
ENR
OPERATION STATUS
TRANSMITTERS
0 0 Normal Operation
All Active
0 1 Normal Operation
All Active
1 0 Shutdown
All High-Z
1 1 Shutdown
All High-Z
RECEIVERS
All Active
All High-Z
All Low-Power Receive Mode
All High-Z
Table 1b. MAX245 Control Pin Configurations
ENT
ENR
OPERATION
STATUS
TRANSMITTERS
TA1–TA4
TB1–TB4
0
0 Normal Operation
All Active
All Active
0
1 Normal Operation
All Active
All Active
1 0 Shutdown
All High-Z
All High-Z
1 1 Shutdown
All High-Z
All High-Z
RECEIVERS
RA1–RA5
RB1–RB5
All Active
All Active
RA1–RA4 High-Z, RB1–RB4 High-Z,
RA5 Active
RB5 Active
All Low-Power
Receive Mode
All Low-Power
Receive Mode
RA1–RA4 High-Z,
RA5 Low-Power
Receive Mode
RB1–RB4 High-Z,
RB5 Low-Power
Receive Mode
Table 1c. MAX246 Control Pin Configurations
ENA
ENB
OPERATION
STATUS
TRANSMITTERS
TA1–TA4
TB1–TB4
0
0 Normal Operation
All Active
All Active
0
1 Normal Operation
All Active
All High-Z
1 0 Shutdown
All High-Z
All Active
1 1 Shutdown
All High-Z
All High-Z
RECEIVERS
RA1–RA5
RB1–RB5
All Active
All Active
All Active
RB1–RB4 High-Z,
RB5 Active
RA1–RA4 High-Z,
RA5 Active
All Active
RA1–RA4 High-Z,
RA5 Low-Power
Receive Mode
RB1–RB4 High-Z,
RA5 Low-Power
Receive Mode
www.maximintegrated.com
Maxim Integrated | 12
12 Page | ||
| Seiten | Gesamt 30 Seiten | |
| PDF Download | [ MAX232 Schematic.PDF ] | |
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