5

LT1332

TYPICAL PERFOR A CE CHARACTERISTICS

Receiver Input Thresholds

vs Supply Voltage

SUPPLY VOLTAGE (V)

2.0

3

4

5

3.5

4.5

6.0

LT1332 • TPC10

2

1

0

2.5

3.0

4.0

5.0

5.5

TEMPERATURE (°C)

–50

1.5

2.0

2.5

25

75

150

LT1332 • TPC11

1.0

0.5

0

–25

0

50

100 125

Receiver Input Thresholds

vs Temperature

SUPPLY VOLTAGE (V)

2.0

0

0.1

0.2

0.3

0.4

3.0

4.0

5.0

6.0

LT1332 • TPC12

0.5

0.6

2.5

3.5

4.5

5.5

RECEIVER

OUTPUT LOW

SINKING 500

µA

RECEIVER

OUTPUT LOW

SINKING 250

µA

RECEIVER

OUTPUT HIGH

SOURCING

Receiver Output Voltage

vs Supply Voltage

PI FU CTIO S

be greater than 6.5V and less than 13.2V to assure valid

RS232 output signals. An additional decoupling ca-

away from the LT1332.

quires an external capacitor. When the device is powered

from a switching regulator, the filter capacitor should be

selected based on the maximum tolerable ripple for the

specified minimum regulator on time. For some low

frequency Burst Mode

should be relatively large (C

≥ 10µF). Low ESR tantalum

accommodate a wide range of logic levels, yet the system

still responds correctly to RS232 signals. Supply current

drops to 40

µA in the SHUTDOWN mode. This pin should

be decoupled with a 0.1

µF ceramic capacitor.

GND: Ground Pins. Pins 13 and 23 (S Package) must both

be grounded for proper operation.

ON/OFF: Controls the operation mode of the device and

is CMOS compatible. A logic low puts the device in the

SHUTDOWN mode which reduces input supply current

to 40

µA and places all of the drivers and four of the

receivers in a high impedance state. A logic high fully

enables the device.

Receiver Output Waveforms

LT1332 • TPC13

INPUT

5V/DIV

RX OUTPUT

2V/DIV

Driver Output Waveforms

LT1332 • TPC13

INPUT

5V/DIV

DRIVER

OUTPUT

10V/DIV

DRIVER

OUTPUT

10V/DIV