MAX240CMH-T Maxim Integrated, MAX240CMH-T Datasheet - Page 11

no-image

MAX240CMH-T

Manufacturer Part Number
MAX240CMH-T
Description
RS-232 Interface IC
Manufacturer
Maxim Integrated
Series
MAX220, MAX222, MAX223, MAX225, MAX230, MAX231, MAX232, MAX232A, MAX233, MAX233A, MAX234, MAX235, MAX236, MAX237, MAX238, MAX239, MAX240, MAX241, MAX242, MAX243, MAX244, MAX245, MAX246, MAX247, MAX248, MAX249r
Datasheet

Specifications of MAX240CMH-T

Data Rate
120 Kbps
Operating Supply Voltage
5 V
Supply Current
15 mA
Operating Temperature Range
0 C to + 70 C
Mounting Style
SMD/SMT
Function
Transceiver
Maximum Operating Temperature
+ 70 C
Minimum Operating Temperature
0 C
Number Of Drivers
5
Number Of I/os
20
Number Of Receivers
5
Propagation Delay Time Ns
10 us
Shutdown
Yes
Maxim Integrated
Figure 1. Transmitter Propagation-Delay Timing
Figure 3. Receiver-Output Enable and Disable Timing
INPUT
OUTPUT
b) ENABLE TIMING
c) DISABLE TIMING
a) TEST CIRCUIT
t
PLHT
+3V
RECEIVER
OUTPUTS
RECEIVER
OUTPUTS
EN INPUT
EN INPUT
R
V
X
V
EN
OH
OL
IN
+3V
0V
R
X
R
X
0V
OUT
150pF
+3V
0V
1kΩ
+5V-Powered, Multichannel RS-232
OUTPUT DISABLE TIME (t
OUTPUT ENABLE TIME (t
V
V
+3.5V
+0.8V
OH
OL
+ 0.5V
- 0.5V
EN
EN
V
V
CC
CC
- 2V
- 2V
t
PHLT
ER
DR
V+
0V
V-
)
)
Figure 2. Receiver Propagation-Delay Timing
Figure 4. Transmitter-Output Disable Timing
OUTPUT
*EXCEPT FOR R2 ON THE MAX243
INPUT
WHERE -3V IS USED.
t
t
PHLR
PHLS
Test Circuits/Timing Diagrams
SHDN
1 OR 0
b) TEST CIRCUIT
a) TIMING DIAGRAM
V+
V-
0V*
MAX220–MAX249
MAX220–MAX249
Drivers/Receivers
+3V
T
X
50%
50%
+3V
0V
3kΩ
+5V
-5V
OUTPUT DISABLE TIME (t
50pF
0V
50%
50%
GND
t
t
DT
PLHR
PLHS
)
V
CC
11