MOTOROLA
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by MC145407/D
SEMICONDUCTOR TECHNICAL DATA
MC145407
Advance Information
5 Volt Only Driver/Receiver
EIA–232–E and CCITT V.28
P SUFFIX
PLASTIC DIP
CASE 738
20
1
The MC145407 is a silicon–gate CMOS IC that combines three drivers and
three receivers to fulfill the electrical specifications of EIA–232–E and CCITT
.
DW SUFFIX
V.28 while operating from a single + 5 V power supply. A voltage doubler and
NC SOG PACKAGE
inverter convert the + 5 V to ± 10 V. This is accomplished through an on–board
I
20
,
CASE 751D
20 kHz oscillator and four inexpensive external electrolytic capacitors. The
1
OR
three drivers and three receivers of the MC145407 are virtually identical to
T
those of the MC145406. Therefore, for applications requiring more than three
UC ORDERING INFORMATION
D
drivers and/or three receivers, an MC145406 can be powered from an
MC145407P
Plastic DIP
MC145407, since the MC145407 charge pumps have been designed to
ON
MC145407DW
SOG Package
IC
guarantee ± 5 V at the output of up to six drivers. Thus, the MC145407 provides
M
a high–performance, low–power, stand–alone solution or, with the MC145406,
SE
a + 5 V only, high–performance two–chip solution.
E
PIN ASSIGNMENT
Drivers
AL
C
• ± 7.5 V Output Swing
S
20 C1+
C2+ 1
EE
• 300 Ω Power–Off Impedance
R
F
• Output Current Limiting
19
2
VCC
GND
• TTL and CMOS Compatible Inputs
BY
D to 30 V/µs
• Slew Rate Range Limited from 4 E
V/µs
18
3
V
I
Receivers
CH
• + 25 V Input Range R
A
• 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 MC145406 Simultaneously
• Requires Four Inexpensive Electrolytic Capacitors
• On–Chip 20 kHz Oscillator
C1–
C2–
VSS
Rx1
Tx1
Rx2
Tx2
Rx3
Tx3
17
4
5
R
R
10
14
DO2
D 13 DI2
8
9
DO1
D 15 DI1
6
7
16
VDD
R
12
DO3
D 11 DI3
D = DRIVER
R = RECEIVER
This document contains information on a new product. Specifications and information herein are subject to change without notice.
REV 1
10/95
© Motorola, Inc. 1995
MOTOROLA
MC145407
1
