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Issue A

ML145406

Driver/Receiver

EIA 232–E and CCITT V.28

(Formerly RS–232–D)

Legacy Device: Motorola MC145406

The ML145406 is a silicon–gate CMOS IC that combines three drivers and

three receivers to fulfill the electrical specifications of standards EIA 232–E

and CCITT V.28. The drivers feature true TTL input compatibility,

slew–rate–limited output, 300–

Ω power–off source impedance, and output typ-

ically switching to within 25% of the supply rails. The receivers can handle up

to ±25 V while presenting 3 to 7 k

Ω impedance. Hysteresis in the receivers

aids reception of noisy signals. By combining both drivers and receivers in a

single CMOS chip, the ML145406 provides efficient, low–power solutions for

EIA 232–E and V.28 applications.

This device offers the following performance features:

• Operating Temperature Range = TA –40° to +85°C

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 k

Ω Input Impedance

• Hysteresis on Input Switchpoint

P DIP 16 = EP

PLASTIC

CASE 648

SO 16W = -5P

SOG

CASE 751G

16

1

16

1

CROSS REFERENCE/ORDERING INFORMATION

MOTOROLA

P DIP 16

MC145406P

ML145406EP

SO 16W

MC145406DW

ML145406-6P

LANSDALE

PACKAGE

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

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

R

D

VDD

Rx1

Tx1

Rx2

Tx2

Rx3

Tx3

VSS

VCC

DO1

DI1

DO2

DI2

DO3

DI3

GND

D = DRIVER

R = RECEIVER

R

R

D

D

BLOCK DIAGRAM

VDD

RECEIVER

VCC

DO

DI

1.4 V

HYSTERESIS

1.8 V

1.0 V

DRIVER

LEVEL

SHIFT

300

Tx

VSS

5.4 k

Rx

15 k

*Protection circuit

VCC

VDD

VDD

VCC

VSS

+

–

+

–

*