LT1180A Просмотр технического описания (PDF) - Linear Technology

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производитель

LT1180A

Low Power 5V RS232 Dual Driver/Receiver with 0.1µF Capacitors

Linear Technology 

TYPICAL PERFOR A CE CHARACTERISTICS

LT1180A/LT1181A

Receiver Short-Circuit Current

50

40

RX ISC–

30

RX ISC+

20

10

0

–55 –25

0 25 50 75 100 125

TEMPERATURE (°C)

LT1180A • TPC10

Shutdown to Driver Outputs

10V

DRIVER 1 5V

OUTPUT

GND

GND

DRIVER 2 – 5V

OUTPUT

– 10V

ON/OFF PIN

LT1180A • TPC12

Slew Rate vs Load Capacitance

16

14

12

10

8

+SLEW

6

–SLEW

4

2

0

0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

LOAD CAPACITANCE (nF)

LT1180A • TPC11

Driver Output Waveforms

DRIVER OUTPUT

RL = 3k

CL = 2500pF

DRIVER OUTPUT

RL = 3k

INPUT

LT1180A • 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 result in low output

drive levels and erratic charge pump operation.

GND: Ground Pin.

ON/OFF: A TTL/CMOS Compatible Operating Mode Con-

trol. A logic low puts the LT1180A in shutdown mode.

Supply current drops to zero and both driver and receiver

outputs assume a high impedance state. A logic high fully

enables the device.

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 capaci-

tors may be used to reduce supply ripple. With multiple

transceivers, the V+ and V – pins may be paralleled into

common capacitors.

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

– 2.5V). This pin requires an external charge storage

capacitor C ≥ 0.1µF. Larger value capacitors may be used

to reduce supply ripple. With multiple transceivers, the V+

and V – pins may be paralleled into common capacitors.

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