MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Order this document
by MC145406/D
MC145406
Driver/Receiver
EIA 232–E and CCITT V.28 (Formerly RS–232–D)
The MC145406 is a silicon–gate CMOS IC that combines three drivers
and three receivers to fulfill the electrical specifications of standards
E I A 2 3 2 – E a n d C C I T T V. 2 8 . T h e d r i v e r s f e a t u r e t r u e T T L i n p u t
compatibility, slew–rate–limited output, 300–Ω power–off source imped-
ance, and output typically 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 MC145406 provides
efficient, low–power solutions for EIA 232–E and V.28 applications.
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
P SUFFIX
PLASTIC
CASE 648
16
1
16
1
DW SUFFIX
SOG
CASE 751G
SD SUFFIX
SSOP
CASE 940B
BLOCK DIAGRAM
VDD
RECEIVER
VDD
VCC
15 kΩ
+
–
VSS
1.0 V
Tx2
1.8 V
HYSTERESIS
VDD
Tx3
DRIVER
VCC
300
Ω
Tx
LEVEL
SHIFT
+
–
1.4 V
DI
VSS
Rx3
DO
Rx2
VCC
Tx1
VDD
Rx1
PIN ASSIGNMENT
1
2
3
4
5
6
7
R
D
R
D
R
D
16
15
14
13
12
11
10
VCC
DO1
DI1
DO2
DI2
DO3
DI3
GND
*
Rx
5.4 k
8
9
D = DRIVER
R = RECEIVER
VSS
*Protection circuit
©
Motorola, Inc. 1995
MOTOROLA
REV 4
1/95
MC145406
1
MOTOROLA [ MOTOROLA, INC ]
