MC145705

•MC145706•MC145707

MOTOROLA

1

Product Preview

5 Volt Only

Driver/Receiver with an

Integrated Standby Mode

EIA–232–E and CCITT V.28

The MC145705/06/07 are a series of silicon–gate CMOS transceiver ICs that

fulfill the electrical specifications of EIA–232–E and CCITT V.28 while operating

from a single + 5 V power supply. These transceiver series are high

performance and low power consumption devices that are equipped with

standby and output enable function.

A voltage doubler and inverter convert the + 5 V to

± 10 V. This is

accomplished through an on–board 20 kHz oscillator and four inexpensive

external electrolytic capacitors.

The MC145705 is composed of two drivers and three receivers, the

MC145706 has three drivers and two receivers, and the MC145707 has three

drivers and three receivers. These drivers and receivers are virtually identical to

those of the MC145407.

Available Driver/Receiver Combinations

Device

Drivers

Receivers

No. of Pins

MC145705

2

3

20

MC145706

3

2

20

MC145707

3

3

24

Drivers:

• ± 7.5 Output Swing

• 300 Ω Power–Off Impedance

• Output Current Limiting

• TTL and CMOS Compatible Inputs

• Three–State Outputs During Standby Mode

• Hold Output OFF (MARK) State by TxEN Pin

Receivers:

• ± 25 V Input Range

• 3 to 7 kΩ Input Impedance

• 0.8 V Hysteresis for Enhanced Noise Immunity

• Three–State Outputs During Standby Mode

Charge Pumps:

• + 5 to ± 10 V Dual Charge Pump Architecture

• Supply Outputs Capable of Driving Three Drivers on the MC145403/06

Simultaneously

• Requires Four Inexpensive Electrolytic Capacitors

• On–Chip 20 kHz Oscillators

This document contains information on a product under development. Motorola reserves the right to change or discontinue this product without notice.

Order this document

by MC145705/D

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

MC145705

MC145706

MC145707

P SUFFIX

PLASTIC DIP

CASE 738

ORDERING INFORMATION

MC145705P

Plastic DIP

MC145706P

Plastic DIP

MC145707P

Plastic DIP

MC145705DW

SOG Package

MC145706DW

SOG Package

MC145707DW

SOG Package

P SUFFIX

PLASTIC DIP

CASE 724

DW SUFFIX

SOG PACKAGE

CASE 751E

DW SUFFIX

SOG PACKAGE

CASE 751D

20

1

24

1

20

1

24

1

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