+5V-Powered, Multichannel RS-232
Drivers/Receivers
MAX220–MAX249
ABSOLUTE MAXIMUM RATINGS—MAX225/MAX244–MAX249
Supply Voltage (V
CC
) ...............................................-0.3V to +6V
Input Voltages
T
IN
‚
ENA, ENB, ENR, ENT, ENRA,
ENRB, ENTA, ENTB..................................-0.3V
to (V
CC
+ 0.3V)
R
IN
.....................................................................................±25V
T
OUT
(Note 3).....................................................................±15V
R
OUT
........................................................-0.3V to (V
CC
+ 0.3V)
Short Circuit (one output at a time)
T
OUT
to GND ............................................................Continuous
R
OUT
to GND............................................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
28-Pin Wide SO (derate 12.50mW/°C above +70°C) .............1W
40-Pin Plastic DIP (derate 11.11mW/°C above +70°C) ...611mW
44-Pin PLCC (derate 13.33mW/°C above +70°C) ...........1.07W
Operating Temperature Ranges
MAX225C_ _, MAX24_C_ _ ..................................0°C to +70°C
MAX225E_ _, MAX24_E_ _ ...............................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering,10sec) ..............................+300°C
Note 4:
Input voltage measured with transmitter output in a high-impedance state, shutdown, or V
CC
= 0V.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS—MAX225/MAX244–MAX249
(MAX225, V
CC
= 5.0V ±5%; MAX244–MAX249, V
CC
= +5.0V ±10%, external capacitors C1–C4 = 1µF; T
A
= T
MIN
to T
MAX
; unless oth-
erwise noted.)
PARAMETER
RS-232 TRANSMITTERS
Input Logic Threshold Low
Input Logic Threshold High
Logic Pull-Up/lnput Current
Data Rate
Output Voltage Swing
Tables 1a–1d
Normal operation
Shutdown
±5
2
1.4
1.4
10
±0.01
120
±7.5
±0.01
±0.01
300
±7
10M
±30
±25
V
CC
= 5V
V
CC
= 5V
V
CC
= 5V
I
OUT
= 3.2mA
I
OUT
= -1.0mA
Sourcing V
OUT
= GND
Shrinking V
OUT
= V
CC
Normal operation, outputs disabled,
Tables 1a–1d, 0V
≤
V
OUT
≤
V
CC
,
ENR_
= V
CC
3.5
-2
10
0.2
3
0.8
1.3
1.8
0.5
5
0.2
V
CC
- 0.2
-10
30
±0.05
±0.10
2.4
1.0
7
0.4
±25
µA
±25
Ω
mA
V
V
V
V
kΩ
V
V
mA
µA
50
±1
64
0.8
V
V
µA
kbits/sec
V
CONDITIONS
MIN
TYP
MAX
UNITS
Tables 1a–1d, normal operation
All transmitter outputs loaded with 3kΩ to GND
ENA, ENB, ENT, ENTA, ENTB
=
V
CC,
V
OUT
= ±15V
V
CC
= 0V,
V
OUT
= ±15V
Output Leakage Current (shutdown)
Tables 1a–1d
Transmitter Output Resistance
Output Short-Circuit Current
RS-232 RECEIVERS
RS-232 Input Voltage Operating Range
RS-232 Input Threshold Low
RS-232 Input Threshold High
RS-232 Input Hysteresis
RS-232 Input Resistance
TTL/CMOS Output Voltage Low
TTL/CMOS Output Voltage High
TTL/CMOS Output Short-Circuit Current
TTL/CMOS Output Leakage Current
V
CC
= V+ = V- = 0V, V
OUT
= ±2V (Note 4)
V
OUT
= 0V
8
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
