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參數(shù)資料
| 型號： | SP3494CN-L |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 7/9頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX RS485/RS422 LP 8NSOIC |
| 標準包裝： | 98 |
| 類型： | 收發(fā)器 |
| 驅(qū)動器/接收器數(shù)： | 1/1 |
| 規(guī)程： | RS422/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(yīng)商設(shè)備封裝： | 8-SOICN |
| 包裝： | 管件 |
7
Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-707 www.exar.com
SP3494_00_0702
The
SP3494 is a +3.3V low power half-
duplex transceiver that meets the electrical
specifications of the RS-485 and RS-422
serial protocols. This device is pin-to-pin
compatible with the
Exar SP348 and
SP48 devices as well as popular industry
standards such as the MAX3486 and the
7576.The
SP3494featureExar'sBiCMOS
processallowinglowpoweroperationwithout
sacrificing performance. The SP3494 has a
partially slew rate limited driver with a data
transmission rate of 2.5Mbps.
Driver
The driver outputs of the
SP3494 are dif-
ferential outputs. The typical voltage output
swing with no load will be 0 volts to V
CC.
With worst case loading of 54 across the
differential outputs, the driver can maintain
greater than .5V voltage levels.
The
SP3494 driver has an enable control
line which is active HIGH. A logic HIGH on
DE (pin 3) will enable the differential driver
outputs. A logic LOW on the DE (pin 3) will
force the driver outputs to high impedance
(high-Z).
The
SP3494 driver will operate up to
2.5Mbps. In addition to adhering to the
250mA I
SC maximum limit on the driver out-
put, the driver output short-circuit protection
will allow the device to withstand an infinite
short circuit over the -7.0V to +2V common
mode range without damage.
Receiver
The receiver has differential inputs with an
input sensitivity of ±200mV. Input imped-
ance 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 which
guarantees that the receiver output will be
in a high state when the input is left uncon-
nected. The receiver of the
SP3494 operate
up to 2.5Mbps.
The receiver of the
SP3494 has an enable
controllinewhichisactiveLOW. AlogicLOW
on RE (pin 2) of the
SP3494 will enable the
differential receiver. A logic HIGH on RE
(pin 2) will disable the receiver.
The
SP3494 is equipped with a shutdown
mode. To enable the shutdown state, both
the driver and receiver must be disable
simultaneously. A logic LOW on DE (pin 3)
and a logic HIGH on RE (pin 2) will put the
SP3494 into shutdown. In shutdown, the
supply current will drop to less than 0A.
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(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP3494CN-L/TR | 功能描述:RS-422接口集成電路 3.3V Slew Ltd RS485/ RS422 2.5Mbps Half RoHS:否 制造商:Texas Instruments 數(shù)據(jù)速率: 工作電源電壓:5 V 電源電流:35 mA 工作溫度范圍: 安裝風格:Through Hole 封裝 / 箱體:PDIP-16 封裝:Tube |
| SP3494CP | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:+3.3V Low Power Slew Rate Limited RS-485/RS-422 Transceivers |
| SP3494CP-L | 制造商:Exar Corporation 功能描述: |
| SP3494EN | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:+3.3V Low Power RS-485/RS-422 Transceivers |
| SP3494EN-L | 功能描述:RS-422接口集成電路 RS485/422 2500 kbps temp -40C to 85C RoHS:否 制造商:Texas Instruments 數(shù)據(jù)速率: 工作電源電壓:5 V 電源電流:35 mA 工作溫度范圍: 安裝風格:Through Hole 封裝 / 箱體:PDIP-16 封裝:Tube |
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