ML145406
Driver/Receiver
EIA 232–E and CCITT V.28
(Formerly RS–232–D)
Legacy Device:
Motorola MC145406
The ML145406 is a silicon–gate CMOS IC that combines three drivers and
three receivers to fulfill the electrical specifications of standards EIA 232–E
and CCITT V The drivers feature true TTL input compatibility,
.28.
slew–rate–limited output, 300–Ω power–off source impedance, and output typ-
ically switching to within 25% of the supply rails. The receivers can handle up
to ±25 V while presenting 3 to 7 kΩ impedance. Hysteresis in the receivers
aids reception of noisy signals. By combining both drivers and receivers in a
single CMOS chip, the ML145406 provides efficient, low–power solutions for
EIA 232–E and V applications.
.28
This device offers the following performance features:
• Operating Temperature Range = TA –40° to +85°C
Drivers
• ± 5 V to ±12 V Supply Range
• 300–Ω Power–Off Source Impedance
• Output Current Limiting
• TTL Compatible
• Maximum Slew Rate = 30 V/µs
Receivers
• ± 25 V Input Voltage Range When VDD = 12 V VSS = – 12 V
,
• 3 to 7 kΩ Input Impedance
• Hysteresis on Input Switchpoint
BLOCK DIAGRAM
VDD
RECEIVER
VDD
VCC
15 k
+
–
VSS
1.0 V
Rx2
1.8 V
HYSTERESIS
VDD
Rx3
DRIVER
VCC
300
Tx
LEVEL
SHIFT
+
–
1.4 V
DI
Tx3
VSS
7
D
10
DI3
GND
6
R
11
DO3
Tx2
DO
VCC
VDD
Rx1
Tx1
1
2
3
4
5
R
D
R
D
16
15
14
13
12
VCC
DO1
DI1
DO2
DI2
P DIP 16 = EP
PLASTIC
CASE 648
16
1
16
1
SO 16W = -5P
SOG
CASE 751G
CROSS REFERENCE/ORDERING INFORMATION
LANSDALE
PACKAGE
MOTOROLA
P DIP 16
SO 16W
MC145406P
MC145406DW
ML145406EP
ML145406-6P
Note:
Lansdale lead free (Pb) product, as it
becomes available, will be identified by a part
number prefix change from
ML
to
MLE.
PIN ASSIGNMENT
*
Rx
5.4 k
8
9
D = DRIVER
R = RECEIVER
VSS
*Protection circuit
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