LTC1384IN 查看數據表（PDF） - Linear Technology

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LTC1384IN

5V Low Power RS232 Transceiver with 2 Receivers Active in Shutdown

Linear Technology 

FEATURES

■ Operates from a Single 5V Supply

Low Supply Current: ICC = 220µA

■ ICC = 35µA in Shutdown Mode with Both

Receivers Kept Alive

■ ESD Protection Over ±10kV

■ Uses Small Capacitors: 0.1µF

■ Operates to 120kBaud

■ Output Overvoltage Does Not Force Current

Back into Supplies

■ RS232 I/O Lines Can Be Forced to ±25V

Without Damage

■ Pin Compatible with LT1180A

U

APPLICATIO S

■ Notebook Computers

■ Palmtop Computers

TYPICAL APPLICATIO

2-Drivers/2-Receivers with Shutdown

and Receiver Enable

0.1µF

0.1µF

LOGIC INPUT

LOGIC INPUT

LOGIC OUTPUT

2

4

5

LTC1384

6 VCC

300k

12

VCC

300k

11

13

5k

17 VCC = 5V

3

7

0.1µF

0.1µF

15

232 OUTPUT

8

232 OUTPUT

14

232 INPUT

10

LOGIC OUTPUT

18

ON/OFF

9

232 INPUT

5k

16

1

RX EN

LTC1384 • TA01

LTC1384

5V Low Power RS232

Transceiver with 2 Receivers

Active in Shutdown

DESCRIPTIO

The LTC®1384 is an ultra-low power 2-driver/2-receiver

RS232 transceiver that operates from a single 5V

supply. The charge pump requires only four space-

saving 0.1µF capacitors.

The transceiver operates in one of two modes, Normal and

Shutdown. In the Normal mode, ICC is only 220µA with the

driver outputs unloaded. In the Shutdown mode, the

charge pump is turned off, the driver outputs are forced

into three-state, both receivers are kept active and ICC

drops to 35µA. The receiver outputs may be forced into

three-state at any time using the receiver enable (RX EN)

pin.

The LTC1384 is fully compliant with all data rate and

overvoltage RS232 specifications. The transceiver can

operate up to 120kbaud with a 2500pF, 3kΩ load. Both

driver outputs and receiver inputs can be forced to

±25V without damage and can survive multiple ±10kV

ESD strikes.

, LTC and LT are registered trademarks of Linear Technology Corporation.

Quiescent and Shutdown Supply Current

vs Temperature

1200

60

TEST CONDITION: VCC = 5V

1000

50

800

SHUTDOWN

CURRENT

40

600

30

400

QUIESCENT

20

CURRENT

200

10

0

–20

0

0

20

40

60

80

TEMPERATURE (°C)

LTC1384 • TA02

1384fa

1

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