MAX237C-D Ver la hoja de datos (PDF) - Maxim Integrated
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MAX237C-D Datasheet PDF : 36 Pages
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+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.)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Normal operation
SHDN = 5V (MAX223)
0.8
1.2
RS-232 Input Threshold Low
TA = +25°C,
VCC = 5V
SHDN = 0V (MAX235/236/240/241)
Shutdown (MAX223)
V
SHDN = 0V,
0.6
1.5
EN = 5V (R4IN, R5IN)
RS-232 Input Threshold High
TA = +25°C,
VCC = 5V
Normal operation
SHDN = 5V (MAX223)
SHDN = 0V (MAX235/236/240/241)
Shutdown (MAX223)
SHDN = 0V,
EN = 5V (R4IN‚ R5IN)
1.7
2.4
V
1.5
2.4
RS-232 Input Hysteresis
VCC = 5V, no hysteresis in shutdown
0.2
0.5
1.0
V
RS-232 Input Resistance
TA = +25°C, VCC = 5V
3
5
7
kΩ
TTL/CMOS Output Voltage Low
IOUT = 1.6mA (MAX231/232/233, IOUT = 3.2mA)
0.4
V
TTL/CMOS Output Voltage High
IOUT = -1mA
3.5 VCC - 0.4
V
TTL/CMOS Output Leakage Current
0V ≤ ROUT ≤ VCC; EN = 0V (MAX223);
EN = VCC (MAX235–241 )
0.05 ±10 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, SHDN = 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
6 _______________________________________________________________________________________
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