LTC487
8
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900
●
FAX
: (408) 434-0507
●
TELEX
: 499-3977
LTC487 • TA13
120
Ω
DRIVER
Z
Y
Figure 12. ESD Protection with TransZorbs
U
S
A
O
PPLICATI
W
U
U
I FOR ATIO
U
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
2
3
4
5
6
7
8
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.
U
A
O
PPLICATI
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