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LT1280A

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

Linear Technology 

LT1280A/LT1281A

U

ESD PROTECTIO

The RS232 line inputs of the LT1280A/LT1281A have on-

chip protection from ESD transients up to ±10kV. The

protection structures act to divert the static discharge

safely to system ground. In order for the ESD protection to

function effectively, the power supply and ground pins of

the circuit must be connected to ground through low

impedances. The power supply decoupling capacitors and

charge pump storage capacitors provide this low imped-

ance in normal application of the circuit. The only con-

straint is that low ESR capacitors must be used for

bypassing and charge storage. ESD testing must be done

with pins VCC, VL, V+, V –, and GND shorted to ground or

connected with low ESR capacitors.

ESD Test Circuit

1

NC

18

ON/OFF

+

0.1µF

2 C1+

0.1µF

+ 3 V+

LT1280A 5V VCC 17

GND 16

4 C1–

DR1 OUT 15

+

0.1µF

0.1µF

+

5 C2+

6 C2–

7 V–

RX1 IN 14

RX1 OUT 13

DR1 IN 12

RS232

LINE PINS

PROTECTED

TO ±10kV

8 DR2 OUT

9 RX2 IN

DR2 IN 11

RX2 OUT 10

+

0.1µF

RS232

LINE PINS

PROTECTED

TO ±10kV

1280A ESD TC

TYPICAL APPLICATI

Supporting an LT1039 (Triple Driver/Receiver)

SHUTDOWN

5V

TTL INPUT

18 ON/OFF

17

VCC

LT1280A

11

8

RS232 OUTPUT

18

VCC

ON/OFF 17

LT1039

15

TTL INPUT

4

RS232 OUTPUT

12

TTL INPUT

15 RS232 OUTPUT

13

TTL INPUT

6

RS232 OUTPUT

13

TTL OUTPUT

14

RS232 INPUT

5k

10

9

TTL OUTPUT

+

1µF

+

1µF

2 C1+

4 C1–

5 C2+

6 C2–

5k

V+ 3

V– 7

GND

16

RS232 INPUT

+

1µF

11

TTL INPUT

16

TTL OUTPUT

14

TTL OUTPUT

12

TTL OUTPUT

+ 1µF

1 V+

9 V–

8

3

30k

5

30k

7

30k

GND

10

RS232 OUTPUT

RS232 INPUT

RS232 INPUT

RS232 INPUT

LT1280A • TA04

6

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