7

LT1331

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

ESD PROTECTIO

ESD Test Circuit

The RS232 line inputs of the LT1331 have on-chip protec-

tion 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

LT1331 must be connected to ground through low imped-

ances. The power supply decoupling capacitors and charge

pump storage capacitors provide this low impedance in

normal application of the circuit. The only constraint is that

low ESR capacitors must be used for bypassing and

low ESR capacitors.

1

2

3

4

5

6

7

8

9

10

11

12

13

14

28

27

26

25

24

23

22

21

20

19

18

17

16

15

DRIVER 1 IN

RX1 OUT

DRIVER 2 IN

RX2 OUT

RX3 OUT

RX4 OUT

DRIVER 3 IN

RX5 OUT (LOW-Q)

0.1

µF

0.2

µF

0.2

µF

0.1

µF

GND

DRIVER DISABLE

NC

RS232

LINE PINS

PROTECTED

TO

±10kV

LT1331

DRIVER 1 OUT

RX1 IN

DRIVER 2 OUT

RX2 IN

RX3 IN

RX4 IN

DRIVER 3 OUT

RX5 IN (LOW-Q)

ON/OFF

0.1

µF

1331 ESD TC

0.1

µF

3.3V

+

+

+

+

PACKAGE DESCRIPTIO

Dimensions in inches (millimeters) unless otherwise noted.

N28 1197

0.009 – 0.015

(0.229 – 0.381)

0.625

+0.035

–0.015

+0.889

–0.381

15.87

()

0.600 – 0.625

(15.240 – 15.875)

0.505 – 0.560*

(12.827 – 14.224)

1.455*

(36.957)

MAX

12

3

4

5

6

7

8

9

10

27

19

20

21

22

24

23

25

26

28

11

12

13

14

15

16

17

18

0.070

(1.778)

TYP

0.015

(0.381)

MIN

0.125

(3.175)

MIN

0.150

± 0.005

(3.810

± 0.127)

0.018

± 0.003

(0.457

± 0.076)

0.035 – 0.080

(0.889 – 2.032)

0.100

± 0.010

(2.540

± 0.254)

0.045 – 0.065

(1.143 – 1.651)

*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.

MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)

NW Package

28-Lead PDIP (Wide 0.600)

(LTC DWG # 05-08-1520)

G Package

28-Lead Plastic SSOP (0.209)

(LTC DWG # 05-08-1640)

G28 SSOP 0694

0.301 – 0.311

(7.65 – 7.90)

12 3

4

5

6 7 8

9 10 11 12

14

13

0.397 – 0.407*

(10.07 – 10.33)

25

26

22 21 20 19 18 17 16 15

23

24

27

28

0.068 – 0.078

(1.73 – 1.99)

0.002 – 0.008

(0.05 – 0.21)

0.0256

(0.65)

BSC

0.010 – 0.015

(0.25 – 0.38)

0.005 – 0.009

(0.13 – 0.22)

0

° – 8°

0.022 – 0.037

(0.55 – 0.95)

0.205 – 0.212**

(5.20 – 5.38)

DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH

SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

DIMENSIONS DO NOT INCLUDE INTERLEAD FLASH. INTERLEAD

FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE

*

**