+5V-Powered, Multichannel RS-232
Drivers/Receivers
ABSOLUTE MAXIMUM RATINGS—MAX225/MAX244–MAX249
Supply Voltage (V ) ...............................................-0.3V to +6V
CC
Input Voltages
Continuous Power Dissipation (T = +70°C)
A
28-Pin Wide SO (derate ±2.50mW/°C above +70°C) .............±W
40-Pin Plastic DIP (derate ±±.±±mW/°C above +70°C) ...6±±mW
44-Pin PLCC (derate ±3.33mW/°C above +70°C) ...........±.07W
Operating Temperature Ranges
T
F ENA, ENB, ENR, ENT, ENRA,
IN
ENRB, ENTA, ENTB..................................-0.3V to (V
+ 0.3V)
CC
R
IN
.....................................................................................±25V
T
R
MAX225C_ _, MAX24_C_ _ ..................................0°C to +70°C
MAX225E_ _, MAX24_E_ _ ...............................-40°C to +85°C
Storage Temperature Range.............................-65°C to +±60°C
Lead Temperature (soldering,±0sec) ..............................+300°C
OUT
OUT
Short Circuit (one output at a time)
T
OUT
R
OUT
Note 4: Input voltage measured with transmitter output in a high-impedance state, shutdown, or V
= 0V.
CC
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
= 5.0V ±5ꢀ; MAX244–MAX249, V
= +5.0V ±±0ꢀ, external capacitors C±–C4 = ±µꢁ; T = T
to T ; unless oth-
MAX
CC
CC
A
MIN
erwise noted.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
RS-232 TRANSMITTERS
Input Logic Threshold Low
Input Logic Threshold High
±.4
±.4
0.8
V
V
2
Normal operation
Shutdown
±0
50
±±
64
Logic Pull-Up/lnput Current
Tables ±a–±d
µA
±0.0±
±20
±7.5
Data Rate
Tables ±a–±d, normal operation
kbits/sec
V
Output Voltage Swing
All transmitter outputs loaded with 3kΩ to GND
±5
ENA, ENB, ENT, ENTA, ENTB =
±0.0±
±0.0±
±25
±25
V
V
= ±±5V
CC, OUT
Output Leakage Current (shutdown)
Tables ±a–±d
µA
V
V
= 0V,
= ±±5V
CC
OUT
Transmitter Output Resistance
Output Short-Circuit Current
RS-232 RECEIVERS
V
V
= V+ = V- = 0V, V
= ±2V (Note 4)
300
±7
±0M
±30
Ω
mA
CC
OUT
= 0V
OUT
RS-232 Input Voltage Operating Range
RS-232 Input Threshold Low
RS-232 Input Threshold High
RS-232 Input Hysteresis
±25
V
V
V
V
V
= 5V
= 5V
= 5V
0.8
±.3
±.8
0.5
5
CC
CC
CC
2.4
±.0
7
V
0.2
3
V
RS-232 Input Resistance
kΩ
V
TTL/CMOS Output Voltage Low
TTL/CMOS Output Voltage High
I
I
= 3.2mA
= -±.0mA
0.2
0.4
OUT
3.5
-2
V
- 0.2
V
OUT
CC
Sourcing V
= GND
-±0
OUT
TTL/CMOS Output Short-Circuit Current
TTL/CMOS Output Leakage Current
mA
µA
Shrinking V
= V
±0
30
OUT
CC
Normal operation, outputs disabled,
Tables ±a–±d, 0V ≤ V ≤ V , ENR_ = V
CC
±0.05
±0.±0
OUT
CC
8
_______________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
