參數(shù)資料
型號(hào): LTC491IS#TRPBF
廠商: Linear Technology
文件頁(yè)數(shù): 2/12頁(yè)
文件大?。?/td> 0K
描述: IC TXRX RS485 LOW POWER 14-SOIC
標(biāo)準(zhǔn)包裝: 2,500
類型: 收發(fā)器
驅(qū)動(dòng)器/接收器數(shù): 1/1
規(guī)程: RS422,RS485
電源電壓: 4.75 V ~ 5.25 V
安裝類型: 表面貼裝
封裝/外殼: 14-SOIC(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 14-SOIC
包裝: 帶卷 (TR)
LTC491
10
491fa
U
S
A
O
PPLICATI
WU
U
I FOR ATIO
Fault Protection
All of LTC’s RS485 products are protected against ESD
transients up to 2kV using the human body model (100pF,
1.5k
). However, some applications need more
protection. The best protection method is to connect a
bidirectional TransZorb
from each line side pin to ground
(Figure 16).
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
Figure 16. ESD Protection with TransZorbs
LTC491 F16
120
DRIVER
Z
Y
required for your application (typically 12V). Also, don’t
forget to check how much the added parasitic capacitance
will load down the bus.
TransZorb is a registered trademark of General Instruments, GSI
U
PACKAGE DESCRIPTIO
N Package
14-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
N14 1002
.020
(0.508)
MIN
.120
(3.048)
MIN
.130
± .005
(3.302
± 0.127)
.045 – .065
(1.143 – 1.651)
.065
(1.651)
TYP
.018
± .003
(0.457
± 0.076)
.005
(0.125)
MIN
.255
± .015*
(6.477
± 0.381)
.770*
(19.558)
MAX
3
1
2
4
5
6
7
8
9
10
11
12
13
14
.008 – .015
(0.203 – 0.381)
.300 – .325
(7.620 – 8.255)
.325
+.035
–.015
+0.889
–0.381
8.255
()
NOTE:
1. DIMENSIONS ARE
INCHES
MILLIMETERS
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
.100
(2.54)
BSC
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