7

LT1130A/LT1140A Series

CC

HARA TERISTICS

A

TYPICALPERFOR

CE

Shutdown to Driver Output

Receiver Short-Circuit Current

Driver Short-Circuit Current

Driver Output Waveforms

LT1137A • TPC12

10

5

0

–10

–5

DRIVER OUTPUT

INPUT

DRIVER OUTPUT

PI FU CTIO S

the shutdown mode. This pin should be decoupled with a

0.1

µF ceramic capacitor close to the package pin. Insuffi-

cient supply bypassing can result in low output drive levels

and erratic charge pump operation.

GND: Ground Pin.

ON/OFF: Control the operation mode of the device and is

TTL/CMOS compatible. A logic low puts the device in the

shutdown mode which reduces input supply curent to zero

and places all of the drivers and receivers in high imped-

ance state. A logic high fully enables the transceiver.

DRIVER DISABLE: This pin provides an alternate control

for the charge pump and RS232 drivers. A logic high on

this pin shuts down the charge pump and places all drivers

in a high impedance state. Receivers remain active under

these conditions. Floating the DRIVER DISABLE pin or

driving it to a logic low level fully enables the transceiver.

A logic low on the ON/OFF pin supersedes the state of the

DRIVER DISABLE pin. Supply current drops to 4mA when

in driver disable mode.

1.5V. This pin requires an external charge storage capaci-

tor C

tors may be used to reduce supply ripple. With multiple

common capacitors. For large numbers of transceivers,

increasing the size of the shared common storage capaci-

tors is recommended to reduce ripple.

TEMPERATURE (°C)

–55

20

25

30

25

75

LT1137A • TPC10

15

10

–25

0

50

100

125

5

0

TEMPERATURE (°C)

–55

0

20

50

0

50

75

LT1137A • TPC11

10

40

30

–25

25

100

125

LT1137A • TPC13

DRIVER

OUTPUT HIGH

ON/OFF PIN

DRIVER

OUTPUT LOW