LT1341CSW 查看數據表（PDF） - Linear Technology

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LT1341CSW

5V RS232 Transceiver with One Receiver Active in Shutdown

Linear Technology 

TYPICAL PERFOR A CE CHARACTERISTICS

LT1341

Driver Short-Circuit Current

30

25

ISC+

20

15

ISC–

10

5

0

–55 –25

0 25 50 75 100 125

TEMPERATURE (°C)

LT1341 • TPC10

Receiver Output Waveforms

RX5 OUTPUT

CL = 50pF

RX1 TO RX4

OUTPUT

CL = 50pF

INPUT

LT1341 • TPC12

Receiver Short-Circuit Current

50

40

RX1 TO RX4 ISC–

30

RX1 TO RX4 ISC+

20

RX5 ISC–

10

RX5 ISC+

0

–55 –25

0 25 50 75 100 125

TEMPERATURE (°C)

LT1341 • TPC11

Driver Output Waveforms

DRIVER OUTPUT

RL = 3k

DRIVER OUTPUT

RL = 3k

CL = 2500pF

INPUT

LT1341 • TPC13

PI FU CTIO S

VCC: 5V Input Supply Pin. This pin should be decoupled

with a 0.1µF ceramic capacitor close to the package pin.

Insufficient supply bypassing can lead to low output drive

levels and erratic charge pump operation.

GND: Ground Pin.

ON/OFF: A TTL/CMOS logic low puts the device in the low

power shutdown mode. All of the drivers and four receiv-

ers go to a high impedance state. Receiver RX5 remains

active while the transceiver is in shutdown. The trans-

ceiver consumes only 60µA of supply current while in

shutdown. 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. All receivers remain active

under these conditions. Floating the driver disable pin or

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

Supply current drops to 3mA when in driver disable mode.

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

DRIVER DISABLE pin.

V+: Positive Supply Output (RS232 Drivers). V+ ≈ 2VCC –

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

tor C ≥ 0.1µF, tied to ground or VCC. Larger value

capacitors may be used to reduce supply ripple. With

multiple transceivers, the V+ and V – pins may be paral-

leled into common capacitors. For large numbers of

transceivers, increasing the size of the storage capaci-

tors is recommended to reduce ripple.

5

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