6

LT1039A/LT1039A-16

The driver output stage of the LT1039A offers signifi-

cantly improved protection over older bipolar and CMOS

designs. In addition to current limiting, the driver output

can be externally forced to

±30V with no damage or

excessive current flow.

LT1039A Driver

– 30V

30V

LT1039A

OUTPUT CAN

BE FORCED

EXTERNALLY

1039A AI01

The driver outputs utilize high impedance overvoltage

protection, eliminating the flow of fault currents into

supplies, as will happen with conventional diode clamp

configurations.

WITH SOME DRIVERS,

EXTERNALLY APPLIED

VOLTAGE CAN FORCE

THE SUPPLIES

1039A AI02

Older RS232 Drivers and Other CMOS Drivers

Placing the LT1039A in the shutdown mode (Pin 17 low)

puts both the driver and receiver outputs in a high imped-

ance state. This allows data line sharing and transceiver

applications.

Sharing a Transmitter Line

LT1039A #1

DRIVER

LT1039A #2

DRIVER

LOGIC

INPUT A

LOGIC

INPUT B

1039A AI03

ON/OFF

(CHANNEL SELECT)

INPUT

LOGIC

INVERTER

RS232

TRANSMISSION

LINE

LT1039A #1

DRIVER

LOGIC

TRANSMIT/RECEIVE

LINE

RS232

TRANSMIT/RECEIVE

LINE

1039A AI05

ON/OFF

(TRANSMIT/RECEIVE)

INPUT

LOGIC

INVERTER

LT1039A #2

RECEIVER

Transceiver

Sharing a Receiver Line

LT1039A #1

RECEIVER

RS232

INPUT A

RS232

INPUT B

1039A AI04

ON/OFF

(CHANNEL SELECT)

INPUT

LOGIC

INVERTER

LOGIC

OUTPUT

LT1039A #2

RECEIVER