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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Order this document
by MC145403/D
MC145403
Drivers/Receivers
EIA–232–E and CCITT V.28
These devices are silicon gate CMOS ICs that combine both the transmitter
and receiver to fulfill the electrical specifications of EIA Standard 232–E and
CCITT V.28. The drivers feature true TTL input compatibility, slew rate limiting
outputs, 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 aid in the reception
of noisy signals. By combining both drivers and receivers in a single CMOS
chip, these devices provide efficient, low–power solutions for both EIA–232–E
and V.28 applications.
These devices offer the following performance features:
Drivers
•± 5 to ± 12 V Supply Range
• 300 Ω Power–Off Source Impedance
• Output Current Limiting
• TTL and CMOS Compatible Inputs
• Driver Slew Rate Range Limited to 30 V/µs Maximum
Receivers
•± 25 V Input Range
• 3 to 7 kΩ Input Impedance
• 0.8 V of Hysteresis for Enhanced Noise Immunity
• TTL and CMOS Compatible Outputs
Available Driver/Receiver Combinations
Device Drivers Receivers Figure No. of Pins
MC145403 3 5 1 20
MC145404 4 4 2 20
MC145405 5 3 3 20
MC145408 5 5 4 24
Alternative EIA–232 devices to consider are:
Three Supply Single Supply
MC145406 (3 x 3) MC145407 (3 x 3)
MC145705 (2 x 3) with Power Down
MC145706 (3 x 2) with Power Down
MC145707 (3 x 3) with Power Down
MC145404
MC145405
MC145408
PLASTIC DIP
20
1
PLASTIC DIP
24
1
DW SUFFIX
20
1
24
1
20
1
ORDERING INFORMATION
MC145403P Plastic DIP
MC145404P Plastic DIP
MC145405P Plastic DIP
MC145408P Plastic DIP
MC145403DW SOG Package
MC145404DW SOG Package
MC145405DW SOG Package
MC145408DW SOG Package
MC145405SD SSOP
SOG PACKAGE
CASE 751D
DW SUFFIX
SOG PACKAGE
CASE 751E
SD SUFFIX
CASE 940B
P SUFFIX
CASE 738
P SUFFIX
CASE 724
SSOP
REV 2
1/97 TN97010600
Motorola, Inc. 1997
MC145403•MC145404•MC145405•MC145408MOTOROLA
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PIN ASSIGNMENTS
(DIP, SOG, AND SSOP)
MC145403
3 DRIVERS/5 RECEIVERS
V
Rx1
Tx1
Rx2
Rx3
Tx2
Rx4
Rx5
Tx3
V
DD
SS
1
2
3
4
5
6
7
8
9
10
20
V
CC
19
R
R
R
R
R
DO1
18
D
DI1
17
DO2
16
DO3
15
D
DI2
14
DO4
13
DO5
12
D
DI3
11
GND
MC145404
4 DRIVERS/4 RECEIVERS
V
Rx1
Tx1
Rx2
Tx2
Rx3
Tx3
Rx4
Tx4
V
DD
SS
1
2
3
4
5
6
7
8
9
10
20
V
CC
19
R
R
R
R
DO1
18
D
DI1
17
DO2
16
D
DI3
15
DO3
14
D
DI3
13
DO4
12
D
DI4
11
GND
MC145405
5 DRIVERS/3 RECEIVERS
V
Rx1
Tx1
Tx2
Rx2
Tx3
Tx4
Rx3
Tx5
V
DD
SS
1
2
3
4
5
6
7
8
9
10
20
V
CC
19
R
R
R
DO1
18
D
DI1
17
D
DI2
16
DO2
15
D
DI3
14
D
DI4
13
DO3
12
D
DI5
11
GND
MC145408
5 DRIVERS/5 RECEIVERS
V
Rx1
Tx1
Rx2
Tx2
Rx3
Tx3
Rx4
Tx4
Rx5
Tx5
DD
1
2
3
4
5
6
7
8
9
10
11
24
V
CC
23
R
R
R
R
R
DO1
22
D
DI1
21
DO2
20
DI2
D
19
DO3
18
D
DI3
17
DO4
16
D
DI4
15
DO5
14
D
DI5
ESD
PROTECTION
Rx
5.4 k
15 k
Ω
FUNCTIONAL DIAGRAM
RECEIVER DRIVER
V
DD
V
Ω
V
+
–
SS
CC
1.0 V
1.8 V
DO
Tx
300
Ω
CC
13
GND
V
CC
+
+
–
–
DI
1.4 V
12
V
SS
V
DD
LEVEL
SHIFT
V
SS
V
MC145403•MC145404•MC145405•MC145408 MOTOROLA
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ABSOLUTE MAXIMUM RATINGS
(Voltages referenced to GND, except where noted)
Rating
DC Supply Voltage (VDD ≥ VCC) V
Input Voltage Range
Rx1 – Rx
DI1 – DI
DC Current Drain per Pin I ± 00 mA
Power Dissipation P
Operating Temperature Range T
Storage Temperature Range T
Symbol V alue Unit
DD
V
SS
V
CC
V
IR
n
n
D
A
stg
– 0.5 to + 13.5
+ 0.5 to – 13.5
– 0.5 to + 6.0
VSS – 15 to VDD+ 15
0.5 to VCC+ 15
1 W
– 40 to + 85 °C
– 85 to + 150 °C
This device contains circuitry to protect the
V
V
inputs and outputs against damage due to high
static voltages or electric fields; however, it is
advised that normal precautions be taken to
avoid applications of any voltage higher than
maximum rated voltages to this high impedance circuit.
For proper operation it is recommended that
V
and Vin be constrained to the ranges
out
described as follows:
Digital I/O: Driver Inputs (DI):
(GND ≤ VDI ≤ VCC).
Receiver Outputs (DO):
(GND ≤ VDO ≤ VCC).
EIA–232 I/O: Driver Outputs (Tx):
(VSS ≤ V
Receiver Inputs (Rx):
VSS – 15 V ≤ V
Reliability of operation is enhanced if unused
outputs are tied off to an appropriate logic
voltage level (e.g., either GND or VCC for DI,
and GND for Rx).
Tx1 – Tx
+ 15 V).
≤ VDD).
n
Rx1 – Rx
n
≤ V
DD
DC ELECTRICAL CHARACTERISTICS (All polarities referenced to GND = 0 V , T
Parameter
DC Supply Voltage V
Quiescent Supply Current (Outputs Unloaded, Inputs Low) VDD = + 12 V
VSS = – 12 V
VCC = + 5 V
= – 40 to + 85°C)
A
Symbol Min Typ Max Unit
DD
V
SS
V
CC
I
DD
I
SS
I
CC
4.5
– 4.5
4.5
—
—
—
5 to 12
– 5 to – 12
5
425
– 400
110
RECEIVER ELECTRICAL SPECIFICATIONS
(Voltage polarities referenced to GND = 0 V, VDD = + 12 V, VSS = – 12 V, TA = – 40 to + 85°C, VCC = + 5 V, ± 10%)
Characteristic
Input Turn–On Threshold Rx1 – Rx
VDO = V
Input Turn–Off Threshold Rx1 – Rx
VDO = V
Input Threshold Hysteresis
∆ = Von – V
Input Resistance
(VSS – 15 V) ≤ V Rx1 – Rx
High Level Output Voltage I
VRx = – 3 to – 25 V* (DO1 – DO
Low Level Output Voltage I
VRx = + 3 to + 25 V* (DO1 – DO
*This is the range of input voltages as specified by EIA–232–E to cause a receiver to be in the high or low.
OL
OH
off
n
≤ (VDD + 15 V)
= – 20 µA
n
)I
n
)I
out
= – 1.0 mA
out
= + 2 mA
out
= + 4 mA
out
Symbol Min Typ Max Unit
n
V
on
n
V
off
V
hys
R
in
V
OH
V
OL
1.35 1.8 2.35 V
0.75 1 1.25 V
0.6 0.8 — V
3 5.4 7 kΩ
4.9
3.8
—
—
4.9
4.3
0.02
0.5
13.2
– 13.2
5.5
635
– 600
200
—
—
0.5
0.7
V
µA
V
V
MC145403•MC145404•MC145405•MC145408MOTOROLA
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