MOTOROLA
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by MC145406/D
SEMICONDUCTOR TECHNICAL DATA
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 impedance, 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
E
AL
Receivers
C
• ± 25 V Input Voltage Range When VDD = 12 V, VSS = – 12 V
ES
• 3 to 7 kΩ Input Impedance
E
• Hysteresis on Input Switchpoint
FR
BY
D
E
IV
BLOCK DIAGRAM
H
RC RECEIVER
A
VDD
*
Rx
S
O
IC
EM
P SUFFIX
PLASTIC
CASE 648
16
1
,
OR
T
16
UC
ND
15 kΩ
PIN ASSIGNMENT
VDD
Rx1
VCC
Tx1
DO
–
Rx2
VSS
1.0 V
Tx2
1.8 V
Rx3
HYSTERESIS
VDD
Tx3
LEVEL
SHIFT
Tx
1
2
16
3
4
D
7
14
13
R
5
6
15
R
D
12
11
R
D
10
VCC
DO1
DI1
DO2
DI2
DO3
DI3
DRIVER
VSS
VCC
300 Ω
DW SUFFIX
SOG
CASE 751G
SD SUFFIX
SSOP
CASE 940B
+
5.4 k
.
1
VDD
VCC
C
IN
+
–
8
9
GND
D = DRIVER
R = RECEIVER
DI
1.4 V
VSS
*Protection circuit
© Motorola, Inc. 1995
MOTOROLA
REV 4
1/95
MC145406
1
