LT1039CN16 데이터 시트보기 (PDF) - Linear Technology

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LT1039CN16

RS232 Driver/Receiver with Shutdown

Linear Technology 

LT1039/LT1039-16

APPLICATIONS INFORMATION

The driver output stage of the LT1039 offers significantly

improved protection over older bipolar and CMOS de-

signs. In addition to current limiting, the driver output

can be externally forced to ±30V with no damage or

excessive current flow, and will not disrupt the supplies.

LT1039 Driver

Sharing a Receiver Line

RS232

INPUT A

LT1039 #1

RECEIVER

LT1039

OUTPUT CAN

BE FORCED

EXTERNALLY

30V

– 30V

1039 AI01

Some drivers have diodes connected between the out-

puts and the supplies, so externally applied voltages can

cause excessive supply voltage to develop

Older RS232 Drivers and Other CMOS Drivers

RS232

INPUT B

ON/OFF

(CHANNEL SELECT)

INPUT

LT1039 #2

RECEIVER

LOGIC

INVERTER

1039 AI04

Transceiver

LOGIC

OUTPUT

V+

WITH SOME DRIVERS,

EXTERNALLY APPLIED

VOLTAGE CAN FORCE

THE SUPPLIES

V–

1039 AI02

Placing the LT1039 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

LOGIC

INPUT A

LT1039 #1

DRIVER

LOGIC

TRANSMIT/RECEIVE

LINE

LT1039 #1

DRIVER

RS232

TRANSMIT/RECEIVE

LINE

LT1039 #2

RECEIVER

ON/OFF

(TRANSMIT/RECEIVE)

INPUT

LOGIC

INVERTER

1039 AI05

The shutdown mode also drops all supply currents (VCC,

V +, V –) to zero for power conscious systems.

LOGIC

INPUT B

ON/OFF

(CHANNEL SELECT)

INPUT

6

LT1039 #2

DRIVER

LOGIC

INVERTER

1039 AI03

RS232

TRANSMISSION

LINE

1039fd

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