www.lansdale.com

ML145583

3.3 Volt Only Driver/Receiver with

an Integrated Standby Mode

RS 232/EIA–232–E and CCITT V.28

Page 1 of 7

Issue A

Legacy Device: Motorola MC145583

The ML145583 is a CMOS transceiver composed of three drivers and

five receivers that fulfills the electrical specifications of EIA–232–E,

EIA–562, and CCITT V.28 while operating from a single + 3.3 or + 5.0 V

power supply. This transceiver is a high–performance, low–power con-

sumption device that is equipped with a standby function.

A voltage tripler and inverter converts the + 3.3 V to ± 8.8 V, or a volt-

age doubler and inverter converts the + 5.0 V to ± 8.8 V. This is accom-

plished through an on–chip 40 kHz oscillator and five inexpensive exter-

nal capacitors.

FEATURES

Drivers:

• ± 5 V Minimum Output Swing at 3.3 or 5.0 V Power Supply

• 300

Ω Power–Off Impedance

• Output Current Limiting

• Three–State Outputs During Standby Mode

Receivers:

• ± 25 V Input Range

• 3 to 7 k

Ω Input Impedance

• 0.8 V Hysteresis for Enhanced Noise Immunity

• Three–State Outputs During Standby Mode

Ring Monitor Circuit:

• Invert the Input Level on Rx1 to Logic Output Level on RIMON at

Standby Mode

28

1

SOIC 28W = -7P

SOG PACKAGE

CASE 751F

MOTOROLA

SOIC 28W

MC145583DW

ML145583-7P

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

C5+

1

C2+

28

GND

2

VCC

27

C5–

3

C2–

26

RIMON

4

C1+

25

VSS

5

C1–

24

STB

6

VDD

23

Rx1

7

DO1

22

Rx2

8

DO2

21

Rx3

9

DO3

20

Tx1

10

DI1

19

Rx4

11

DO4

18

Tx2

12

DI2

17

Rx5

13

DO5

16

Tx3

14

DI3

15

RING

MONITOR

CIRCUIT

(INVERTING)