5

LT1039/LT1039-16

1039fd

Shutdown to Receiver Output

BIAS Pin Response Time

drops to zero in shutdown mode. Driver outputs are in a

BIAS (Pin 2): Keeps receiver 1 on while the LT1039 is in

the shutdown mode. Leave BIAS pin open when not in use.

See Applications Information for proper use.

REC IN (Pins 3, 5, 7): Receiver Input Pins. Accepts RS232

voltage levels (

±30V) and has 0.4V of hysteresis to pro-

vide noise immunity. Input impedance is nominally 30k

Ω.

TR OUT (Pins 4, 6, 8): Driver Outputs with RS232 Voltage

Levels. Outputs are in a high impedance state when in the

allow data line sharing. Outputs are fully short-circuit

in the shutdown mode. Typical output breakdowns are

greater than

±45V and higher applied voltages will not

damage the device if moderately current limited.

GND (Pin 10): Ground Pin.

TR IN (Pins 11, 13, 15): RS232 Driver Input Pins. Inputs

are TTL/CMOS compatible. Inputs should not be allowed

REC OUT (Pins 12, 14, 16): Receiver Outputs with TTL/

CMOS Voltage Levels. Outputs are in a high impedance

state when in the shutdown mode to allow data line

sharing. Outputs are fully short-circuit protected to ground

ON/OFF (Pin 17): Controls the operation mode of the

LT1039 and is TTL/CMOS compatible. A logic low puts the

device in the shutdown mode which reduces input supply

current to zero and places both driver and receiver outputs

in a high impedance state.

6V

4V

2V

0V

RECEIVER

OUTPUT

5V

0V

ON/OFF

INPUT

1ms/DIV

1039 G11

5V

BIAS INPUT

(THRU 25k

Ω)

0.2

µs/DIV

1039 G12

0V

2V

4V

6V

RECEIVER 1

OUTPUT

0V