ML145407
5 Volt Only Driver/Receiver
RS232 EIA–232–E and CCITT V.28
Legacy Device:
Motorola MC145407
The ML145407 is a silicon–gate CMOS IC that combines three
drivers and three receivers to fulfill the electrical specifications of
RS232 EIA–232–E and CCITT V while operating from a single + 5
.28
V power supply. A voltage doubler and inverter convert the + 5V to ±
10 V This is accomplished through an on–board 20 kHz oscillator
.
and four inexpensive external electrolytic capacitors. The three drivers
and three receivers of the ML145407 are virtually identical to those of
the ML145406. Therefore, for applications requiring more than three
drivers and/or three receivers, an ML145406 can be powered from an
ML145407, since the ML145407 charge pumps have been designed to
guarantee ± 5 V at the output of up to six drivers. Thus, the
ML145407 provides a high–performance, low–power, stand–alone
solution or, with the ML145406, a + 5 V only, high–performance
two–chip solution.
This device offers the following performance features:
• Operating Temperature Range = TA –40° to +85°C
Drivers
• ± 7.5 V Output Swing
• 300Ω Power–Off Impedance
• Output Current Limiting
• TTL and CMOS Compatible Inputs
• Slew Rate Range Limited from 4 V/µs to 30 V/µs
Receivers
• + 25 V Input Range
• 3 to 7 kΩ Input Impedance
• 0.8 V Hysteresis for Enhanced Noise Immunity
Charge Pumps
• + 5 V to ± 10 V Dual Charge Pump Architecture
• Supply Outputs Capable of Driving Three On–Chip Drivers and
Three Drivers on the ML145406 Simultaneously
• Requires Four Inexpensive Electrolytic Capacitors
• On–Chip 20 kHz Oscillator
20
1
P DIP 20 = RP
PLASTIC DIP
CASE 738
20
1
SOG 20 = -6P
SOG PACKAGE
CASE 751D
CROSS REFERENCE/ORDERING INFORMATION
PACKAGE
MOTOROLA
LANSDALE
P DIP 20
SOG 20
MC145407P
MC145407DW
ML145407RP
ML145407-6P
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
C2+
GND
C2–
VSS
Rx1
Tx1
Rx2
Tx2
Rx3
Tx3
1
2
3
4
5
6
7
8
9
10
20 C1+
19
18
17
16
VCC
C1–
VDD
DO1
R
D 15 DI1
R
14
DO2
D 13 DI2
R
12
DO3
D 11 DI3
D = DRIVER
R = RECEIVER
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