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參數(shù)資料
| 型號： | LTC489 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Quad RS485 Line Receiver |
| 中文描述： | 485四線接收器 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大小： | 228K |
| 代理商： | LTC489 |
6
LTC488/LTC489
TI
W
E WAVEFOR
S
UG
WITCHI
W
S
Figure 3. Receiver Propagation Delays
0V
–V
OD2
t
PHL
f = 1MHz; t
r
≤
10ns; t
f
≤
10ns
0V
t
PLH
V
OD2
INPUT
A, B
V
OH
1.5V
1.5V
V
OL
RO
INPUT
488/9 F03
f = 1MHz; t
r
≤
10ns; t
f
≤
10ns
1.5V
RO
488/9 F04
0V
3V
1.5V
t
ZL
V
OL
V
OH
1.5V
t
LZ
0.5V
0.5V
t
HZ
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
0V
5V
1.5V
t
ZH
RO
EN OR
EN12
Figure 4. Receiver Enable and Disable Times
U
S
A
O
PPLICATI
U
U
Typical Application
A typical connection of the LTC488/LTC489 is shown in
Figure 5. Two twisted-pair wires connect up to 32 driver/
receiver pairs for half-duplex data transmission. There are
no restrictions on where the chips are connected to the
wires, and it isn’t necessary to have the chips connected
at the ends. However, the wires must be terminated only
at the ends with a resistor equal to their characteristic
impedance, typically 120
. The input impedance of a
receiver is typically 20k to GND, or 0.5 unit RS485 load, so
in practice 50 to 60 transceivers can be connected to the
same wires. The optional shields around the twisted-pair
help reduce unwanted noise, and are connected to GND at
one end.
Cables and Data Rate
The transmission line of choice for RS485 applications is
a twisted-pair. There are coaxial cables (twinaxial) made
for this purpose that contain straight-pairs, but these are
less flexible, more bulky, and more costly than twisted-
pairs. Many cable manufacturers offer a broad range of
120
cables designed for RS485 applications.
Losses in a transmission line are a complex combination
of DC conductor loss, AC losses (skin effect), leakage, and
AC losses in the dielectric. In good polyethylene cable
such as the Belden 9841, the conductor losses and dielec-
tric losses are of the same order of magnitude, leading to
relatively low overall loss (Figure 6).
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC489C | Quad RS485 Line Receiver |
| LTC489I | Quad RS485 Line Receiver |
| LTC491IN | Differential Driver and Receiver Pair |
| LTC491 | Differential Driver and Receiver Pair |
| LTC491C | Differential Driver and Receiver Pair |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC489CN | 功能描述:IC LINE RCVR RS485 QUAD 16-DIP 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 |
| LTC489CN#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:- 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 |
| LTC489CNPBF | 制造商:Linear Technology 功能描述:Quad RS485 line receiver,LTC489CN DIP16 |
| LTC489CSW | 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 |
| LTC489CSW#20215 | 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 |
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