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參數(shù)資料
| 型號： | LTC489IN |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 通用總線功能 |
| 英文描述： | Quad RS485 Line Receiver |
| 中文描述： | QUAD LINE RECEIVER, PDIP16 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-16 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 228K |
| 代理商： | LTC489IN |
9
LTC488/LTC489
Receiver Open-Circuit Fail-Safe
Some data encoding schemes require that the output of
the receiver maintains a known state (usually a logic 1)
when the data is finished transmitting and all drivers on the
line are forced in three-state. The receiver of the LTC488/
LTC489 has a fail-safe feature which guarantees the out-
put to be in a logic 1 state when the receiver inputs are left
floating (open-circuit). When the input is terminated with
120
and the receiver output must be forced to a known
state, the circuits of Figure 10 can be used.
U
S
A
O
PPLICATI
U
U
The termination resistors are used to generate a DC bias
which forces the receiver output to a known state, in this
case a logic 0. The first method consumes about 208mW
and the second about 8mW. The lowest power solution is
to use an AC termination with a pullup 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,
1.5k). However, some applications need more protection.
The best protection method is to connect a bidirectional
TransZorb
from each line side pin to ground (Figure 11).
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 instruments, GSI, and come in a variety of break-
down 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.
TransZorb is a registered trademark of General Instruments, GSI
488/9 F11
120
DRIVER
Y
Z
Figure 11. ESD Protection with TransZorbs
488/9 F10
110
RX
130
130
110
5V
RX
RECEIVER
1.5k
120
5V
1.5k
RX
120
5V
C
100k
RECEIVER
RECEIVER
Figure 10. Forcing “0” When All Drivers Are Off
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC488 | Quad RS485 Line Receiver |
| LTC488C | Quad RS485 Line Receiver |
| LTC488CN | Quad RS485 Line Receiver |
| LTC488CS | Quad RS485 Line Receiver |
| LTC488I | Quad RS485 Line Receiver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC489IN#PBF | 功能描述:IC LINE RCVR RS485 QUAD 16-DIP RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標準包裝:27 系列:- 類型:收發(fā)器 驅(qū)動器/接收器數(shù):3/3 規(guī)程:RS232，RS485 電源電壓:4.75 V ~ 5.25 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC 包裝:管件 |
| LTC489INPBF | 制造商:Linear Technology 功能描述:RS-485 Quad Receiver 7mA 5V PDIP16 |
| LTC489ISW | 功能描述:IC LINE RCVR RS485 QUAD 16-SOIC RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標準包裝:27 系列:- 類型:收發(fā)器 驅(qū)動器/接收器數(shù):3/3 規(guī)程:RS232，RS485 電源電壓:4.75 V ~ 5.25 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC 包裝:管件 |
| LTC489ISW#PBF | 功能描述:IC LINE RCVR RS485 QUAD 16-SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 產(chǎn)品培訓模塊:RS-232 & USB Transceiver 標準包裝:2,000 系列:- 類型:收發(fā)器 驅(qū)動器/接收器數(shù):1/1 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:16-SSOP（0.209"，5.30mm 寬） 供應(yīng)商設(shè)備封裝:16-SSOP 包裝:帶卷 (TR) 其它名稱:296-19849-2 |
| LTC489ISW#TR | 功能描述:IC DRIVER RS485 QUAD LP 16SOIC RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標準包裝:27 系列:- 類型:收發(fā)器 驅(qū)動器/接收器數(shù):3/3 規(guī)程:RS232，RS485 電源電壓:4.75 V ~ 5.25 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC 包裝:管件 |
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