LTC487

8

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7487

LTC487 • TA13

120

Ω

DRIVER

Z

Y

Figure 12. ESD Protection with TransZorbs

S

APPLICATI

I FOR ATIO

PACKAGE DESCRIPTIO

Dimensions in inches (millimeters) unless otherwise noted.

N Package, 16-Lead Plastic DIP

S Package, 16-Lead Plastic SOL

N16 0594

0.260 ± 0.010*

(6.604 ± 0.254)

0.770*

(19.558)

MAX

16

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

0.015

(0.381)

MIN

0.125

(3.175)

MIN

0.130 ± 0.005

(3.302 ± 0.127)

0.065

(1.651)

TYP

0.045 – 0.065

(1.143 – 1.651)

0.018 ± 0.003

(0.457 ± 0.076)

0.045 ± 0.015

(1.143 ± 0.381)

0.100 ± 0.010

(2.540 ± 0.254)

0.009 – 0.015

(0.229 – 0.381)

0.300 – 0.325

(7.620 – 8.255)

0.325

+0.025

–0.015

+0.635

–0.381

8.255

()

*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.

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

SOL16 0494

NOTE:

1. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS.

THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS.

NOTE 1

0.398 – 0.413

(10.109 – 10.490)

(NOTE 2)

16

15

14

13

12

11

10

9

1

23

4

5

6

78

0.394 – 0.419

(10.007 – 10.643)

0.037 – 0.045

(0.940 – 1.143)

0.004 – 0.012

(0.102 – 0.305)

0.093 – 0.104

(2.362 – 2.642)

0.050

(1.270)

TYP

0.014 – 0.019

(0.356 – 0.482)

TYP

0° – 8° TYP

NOTE 1

0.005

(0.127)

RAD MIN

0.009 – 0.013

(0.229 – 0.330)

0.016 – 0.050

(0.406 – 1.270)

0.291 – 0.299

(7.391 – 7.595)

(NOTE 2)

× 45°

0.010 – 0.029

(0.254 – 0.737)

2. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.

MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm).

A TransZorb is a silicon transient voltage suppressor that

has exceptional surge handling capabilities, fast response

time, and low series resistance. They are available from

General Semiconductor Industries and come in a variety of

breakdown voltages and prices. Be sure to pick a break-

down voltage higher than the common-mode voltage

required for your application (typically 12V). Also, don’t

forget to check how much the added parasitic capacitance

will load down the bus.

APPLICATI

TYPICAL

RS232 to RS485 Level Translator with Hysteresis

LTC487 • TA14

HYSTERESIS = 10k

Ω •

≈

⎜VY - VZ ⎜

————

R

19k

————

R

120

Ω

DRIVER

Y

Z

R = 220k

10k

RS232 IN

5.6k

1/4 LTC487

©LINEAR TECHNOLOGY CORPORATION 1994

sn487 487fas LT/GP 0894 0K REV A • PRINTED IN USA