LTC486C(RevA) Ver la hoja de datos (PDF) - Linear Technology
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LTC486C Datasheet PDF : 8 Pages
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LTC486
APPLICATI S I FOR ATIO
solution is to use an AC termination with a pull-up resistor.
Simply swap the receiver inputs for data protocols ending
in logic 1.
Fault Protection
All of LTC’s RS485 products are protected against ESD
transients up to ±2kV using the human body model
(100pF, 1.5kΩ). However, some applications need greater
protection. The best protection method is to connect a
bidirectional TransZorb® from each line side pin to ground
(Figure 12).
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.
DRIVER
Y
120Ω
Z
LTC486 • TA13
Figure 12. ESD Protection
TransZorb® is a registrated trademark of General Instruments, GSI
TYPICAL APPLICATI
RS232 to RS485 Level Translator with Hysteresis
R = 220k
RS232 IN
10k
5.6k
DRIVER
Y
120Ω
1/4 LTC486
Z
HYSTERESIS
=
10k
×
⎜—VY—-—VZ—⎜
R
≈
19k
——
R
LTC486 • TA14
PACKAGE DESCRIPTIO
N Package
16-Lead Plastic DIP
0.300 – 0.325
(7.620 – 8.255)
0.009 – 0.015
(0.229 – 0.381)
+0.025
0.325 –0.015
( ) 8.255
+0.635
–0.381
Dimensions in inches (millimeters) unless otherwise noted.
0.130 ± 0.005
(3.302 ± 0.127)
0.045 – 0.065
(1.143 – 1.651)
0.770
(19.558)
MAX
16 15 14 13 12 11 10 9
0.015
(0.381)
MIN
0.125
(3.175)
MIN
0.045 ± 0.015
(1.143 ± 0.381)
0.100 ± 0.010
(2.540 ± 0.254)
0.065
(1.651)
TYP
0.018 ± 0.003
(0.457 ± 0.076)
0.260 ± 0.010
(6.604 ± 0.254)
12
3
4
5
6
78
S Package
16-Lead Plastic SOL
0.005
(0.127)
RAD MIN
0.291 – 0.299
(7.391 – 7.595)
(NOTE 2)
0.010
(0.254
–
–
0.029
0.737)
×
45°
0.093 – 0.104
(2.362 – 2.642)
0° – 8° TYP
0.009 – 0.013
(0.229 – 0.330)
NOTE:
NOTE 1
0.016 – 0.050
(0.406 – 1.270)
0.050
(1.270)
TYP
0.014 – 0.019
(0.356 – 0.482)
TYP
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.
2. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm).
0.037 – 0.045
(0.940 – 1.143)
0.398 – 0.413
(10.109 – 10.490)
(NOTE 2)
16 15 14 13 12 11 10 9
0.004 – 0.012
(0.102 – 0.305)
NOTE 1
0.394 – 0.419
(10.007 – 10.643)
123 45678
8
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900 ● FAX: (408) 434-0507 ● TELEX: 499-3977
sn486 486fas LT/GP 0294 5K REV A • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 1994
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