4

LT1080/LT1081

10801fe

TEMPERATURE (

°C)

–55

–25

0

25

50

75

100

125

1080/81 G01

10

8

6

4

2

0

–2

–4

–6

–8

–10

OUTPUT HIGH

OUTPUT LOW

TIME (ms)

0

0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0

1080/81 G03

10

8

6

4

2

0

–2

–4

–6

–8

–10

C1 TO C4 = 1

µF

OUTPUT CURRENT (mA)

02468

10 12 14 16 18 20

1080/81 G02

10

8

6

4

2

0

–2

–4

–6

–8

–10

LOADED TO GROUND

LOADED TO GROUND

Driver Output Voltage

Supply Generator Outputs

or Shutdown

capacitor (

supply. When a separate positive supply is used, C1 can be

deleted.

for charge storage. May be loaded (up to 15mA) for

graphs). Capacitor may be tied to ground or +5V input

be paralleled into common capacitors.

(

≥1µF) for charge stroage. May be loaded (up to –15mA)

pins may be paralleled into common capacitors.

TR2 OUT; TR1 OUT (Pins 8, 15): Driver Outputs with

RS232 Voltage Levels. Outputs are in a high impedance

state when in the SHUTDOWN mode or when power is off

power on, off or in the SHUTDOWN mode. Typical output

breakdowns are greater than

±45V and higher applied

voltages will not damage the device if moderately current

limited. Shorting one output will affect output from the

other.

REC2 IN; REC1 IN (Pins 9, 14): Receiver Inputs. Accepts

RS232 voltage levels (

±30V) and has 0.4V of hysteresis to

provide noise immunity. Input impedance is nominally

5k

Ω.

REC2 OUT; REC1 OUT (Pins 10, 13): 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

mode.

TR2 IN; TR1 IN (Pins 11, 12): RS232 Driver Input Pins.

Inputs are TTL/CMOS compatible. Inputs should not be

GND (Pin 16): Ground Pin.

zero in the SHUTDOWN mode.

ON/OFF (Pin 18): Contols the operation mode of the

LT1080 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. A logic high fully

enables the device.

TYPICAL PERFOR A CE CHARACTERISTICS