LTC490

8

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7487

© LINEAR TECHNOLOGY CORPORATION 1993

S8 Package

8-Lead Plastic SOIC

S

APPLICATI

I FOR ATIO

suppressor that has exceptional surge handling capabili-

ties, fast response time, and low series resistance. They

are available from General Instruments, GSI and come in

a variety of breakdown voltages and prices. Be sure to pick

a breakdown 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.

S

APPLICATI

TYPICAL

1

2

3

4

0.150 – 0.157

(3.810 – 3.988)

8

7

6

5

0.189 – 0.197

(4.801 – 5.004)

0.228 – 0.244

(5.791 – 6.197)

0.016 – 0.050

0.406 – 1.270

0.010 – 0.020

(0.254 – 0.508)

× 45°

0°– 8° TYP

0.008 – 0.010

(0.203 – 0.254)

0.053 – 0.069

(1.346 – 1.752)

0.014 – 0.019

(0.355 – 0.483)

0.004 – 0.010

(0.101 – 0.254)

0.050

(1.270)

BSC

0.045 ± 0.015

(1.143 ± 0.381)

0.100 ± 0.010

(2.540 ± 0.254)

0.065

(1.651)

TYP

0.045 – 0.065

(1.143 – 1.651)

0.130 ± 0.005

(3.302 ± 0.127)

0.020

(0.508)

MIN

0.018 ± 0.003

(0.457 ± 0.076)

0.125

(3.175)

MIN

0.009 – 0.015

(0.229 – 0.381)

0.300 – 0.320

(7.620 – 8.128)

0.325

+0.025

–0.015

+0.635

–0.381

8.255

()

12

3

4

87

6

5

0.250 ± 0.010

(6.350 ± 0.254)

0.400

(10.160)

MAX

N8 Package

8-Lead Plastic DIP

LTC490 • TA12

120

Ω

DRIVER

Z

Y

Figure 11. ESD Protection with TransZorbs

®

RS232 Receiver

RS232 to RS485 Level Transistor with Hysteresis

120

Ω

DRIVER

Y

Z

R = 220k

10k

RS232 IN

5.6k

LTC490 • TA14

HYSTERESIS = 10k •

≈

1/2 LTC490

VY - VZ

————

R

19k

——

R

LTC490 • TA13

5.6k

RECEIVER

RS232 IN

1/2 LTC490

RX

BA/LT/GP 0893 5K REV A • PRINTED IN USA