參數資料
| 型號： | SP3485EN-L/TR |
| 廠商： | Exar Corporation |
| 文件頁數： | 7/9頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX RS485 HALF DUPLEX 8NSOIC |
| 標準包裝： | 2,500 |
| 類型： | 收發(fā)器 |
| 驅動器/接收器數： | 1/1 |
| 規(guī)程： | RS485 |
| 電源電壓： | 3.3V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 8-SOICN |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | SP3485EN-L/TR-ND |
7
Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-707 www.exar.com
SP3485_00_0692
The
SP3485 is a member in the family of
+3.3V low power half-duplex transceivers
that meet the electrical specifications of the
RS-485 and RS-422 serial protocols. This
device is pin-to-pin compatible with the
Exar
SP48, SP483 and SP485 devices as well
as popular industry standards. The
SP3485
feature
Exar's BiCMOS process allowing
low power operation without sacrificing
performance.
Driver
The driver outputs of the
SP3485 are dif-
ferential outputs meeting the RS-485 and
RS-422 standards. The typical voltage
output swing with no load will be 0 volts to
+3.3 Volts. With a load of 54 across the
differential outputs, the drivers can maintain
greater than .5V voltage levels.
The driver of the
SP3485 has a driver enable
control line which is active HIGH. A logic
HIGHonDE(pin3)willenablethedifferential
driver outputs. A logic LOW on the DE (pin
3) will tri-state the driver outputs.
The driver of the SP3485 operates up to
0Mbps. The 250mA I
SC maximum limit
on the driver output allows the SP3485 to
withstand an infinite short circuit over the
-7.0V to +2V common mode range without
catastrophic damage to the IC.
Receiver
The
SP3485 receiver has differential inputs
with an input sensitivity of ±200mV. Input
impedance of the receiver is typically 15k
(12k minimum). A wide common mode
range of -7V to +2V allows for large ground
potential differences between systems. The
receiver is equipped with a fail-safe feature
that guarantees the receiver output will be
in a HIGH state when the input is left uncon-
nected.Thereceiverofthe
SP3485operates
up to 0Mbps.
The receiver of the
SP3485 has an enable
control line which is active LOW. A logic
LOW on RE (pin 2) will enable the differential
receiver. A logic HIGH on RE (pin 2) of the
SP3485 will disable the receiver.
DESCRIPTION
INPUTS
OUTPUTS
RE
DE
DI
LINE
CONDITION
B
A
X
No Fault
0
X
0
No Fault
0
X
0
X
Z
INPUTS
OUTPUTS
RE
DE
A - B
R
0
+0.2V
0
-0.2V
0
Inputs Open
0
X
Z
Table . Transmit Function Truth Table
Table 2. Receive Function Truth Table
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相關代理商/技術參數 |
參數描述 |
|---|---|
| SP3485EP | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:+3.3V Low Power Half-Duplex RS-485 Transceivers with 10Mbps Data Rate |
| SP3486 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:+3.3V Low Power Quad RS-485/RS-422 Line Drivers |
| SP3486CP | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:+3.3V Low Power Quad RS-485/RS-422 Line Drivers |
| SP3486CT | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:+3.3V Low Power Quad RS-485/RS-422 Line Drivers |
| SP3486EP | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:+3.3V Low Power Quad RS-485/RS-422 Line Drivers |
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