- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄10035 > SP334CT-L/TR (Exar Corporation)IC TXRX RS232/485 PROG 28WSOIC PDF資料下載
參數(shù)資料
| 型號： | SP334CT-L/TR |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 2/13頁 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS232/485 PROG 28WSOIC |
| 標準包裝： | 1,500 |
| 類型： | 收發(fā)器 |
| 驅動器/接收器數(shù)： | 3/5 |
| 規(guī)程： | RS232，RS485 |
| 電源電壓： | 5V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-SOIC（0.295"，7.50mm 寬） |
| 供應商設備封裝： | 28-SOIC W |
| 包裝： | 帶卷 (TR) |
0
Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-707 www.exar.com
SP334_00_090909
Drivers
The
SP334 has three independent RS-232
single-endeddriversand two differential RS-
485 drivers. Control for the mode selection
is done by the RS232/RS485 select pin. The
drivers are pre-arranged such that for each
mode of operation the relative position and
functionality of the drivers are set up to ac-
commodate the selected interface mode.As
the mode of the drivers is changed, the elec-
trical characteristics will change to support
the requirements of clock, data, and control
line signal levels. Unused driver inputs can
be left floating; however, to ensure a desired
state with no input signal, pull–up resistors
to +5V or pull–down resistors to ground are
suggested. Since the driver inputs are both
TTLor CMOS compatible, any value resistor
less than 100k will suffice.
When in RS-232 mode, the single-ended
RS-232 drivers produce compliant RS-232E
and ITU V.28 signals. Each of the three
drivers output single-ended bipolar signals
in access of ±5V with a full load of 3k and
2500pF applied as specified. These drivers
can also operate at least 20kbps.
When programmed to RS-485 mode, the
differentialRS-485driversproducecomplaint
RS-485 signals. Each RS-485 driver outputs
a unipolar signal on each output pin with a
magnitude of at least .5V while loaded with
a worst case of 54 between the driver's
two output pins. The signal levels and drive
capability of the RS-485 drivers allow the
drivers to also comply with RS-422 levels.
The transmission rate for the differential
drivers is 0Mbps.
Receivers
The
SP334 has five single-ended receivers
whenprogrammedforRS-232modeandtwo
differential receivers when programmed for
RS-485 mode.
Control for the mode selection is done by
the same select pin as the drivers. As the
operating mode of the receivers is changed,
the electrical characteristics will change to
support the requirements of the appropriate
serial standard. Unused receiver inputs can
be left floating without causing oscillation.To
ensure a desired state of the receiver
output, a pull–up resistor of 100k to +5V
should be connected to the inverting input
for a logic low, or the non–inverting input
for a logic high. For single-ended receiv-
ers, a pull–down resistor to ground of 5k
is internally connected, which will ensure a
logic high output.
The RS-232 receiver has a single–ended
input with a threshold of 0.8V to 2.4V. The
RS-232 receiver has an operating voltage
range of ±5V and can receive signals up
to 20kbps. RS-232 receivers are used in
RS-232 mode for all signal types include
data, clock, and control lines of the RS-232
serial port.
ThedifferentialRS-485receiverhasaninput
impedance of 15k and a differential thresh-
old of ±200mV. Since the characteristics of
an RS-422 receiver are actually subsets of
RS-485, the receivers for RS-422 require-
ments are identical to the RS-485 receivers.
All of the differential receivers can receive
data up to 0Mbps.
Enable Pins
The
SP334 drivers can be enabled by use
of the TXEN pin. A logic HIGH will enable
the driver outputs and a logic LOW will tri-
state the outputs. The drivers can only be
tri-stated in RS-485 mode. The drivers are
always active in RS-232 mode.
The Receiver outputs can also be tri-stated
by the use of the RXEN pin. A logic LOW
will enable the receiver outputs and a logic
HIGH will tri-state the outputs. . The receiver
tri-state capability is offered for both RS-232
and RS-485 modes. The input impedance
of the receivers during tri-state is at least
12k.
Applications
The
SP334 allows the user flexibility in hav-
ing a RS-232 or RS-485 serial port without
usingtwodifferentdiscreteactiveIC's.Figure
8 shows a connection to a standard DB-9
RS-232 connector. In RS-485 mode, the
SP334 is a full duplex transceiver, however,
a half duplex configuration can be made by
connecting the driver outputs to receiver
inputs.
相關PDF資料 |
PDF描述 |
|---|---|
| IDT72V3613L20PF8 | IC FIFO CLOCK 64X36 20NS 120TQFP |
| VI-J0L-MX-S | CONVERTER MOD DC/DC 28V 75W |
| MS27656T17A35SD | CONN RCPT 55POS WALL MNT W/SCKT |
| IDT72V3612L20PF8 | IC FIFO 64X36X2 20NS 120QFP |
| LT1794CSW#TRPBF | IC OPAMP 200MHZ DUAL 20-SOIC |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SP334ET | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Programmable RS-232/RS-485 Transceiver |
| SP334ET-L | 功能描述:RS-232接口集成電路 RS232/422/RS485 Transceiver Multi RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| SP334ET-L/TR | 功能描述:RS-232接口集成電路 Programmable RS232/ RS485 Transceiver RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| SP3-3-50 | 制造商:RHOMBUS-IND 制造商全稱:Rhombus Industries Inc. 功能描述:SP3 Series Mini-SIP Passive Delay Modules |
| SP3-3501 | 功能描述:CONN 3.5MM MALE STEREO PWR PLUG RoHS:是 類別:連接器，互連式 >> 套管 - 音頻 系列:- 標準包裝:1 系列:SealTite® 連接器類型:唱機（RCA）插座 類型:公頭 信號線路:單聲道 插頭/配接插頭直徑:3.20mm 內(nèi)徑，9.00mm 外徑（RCA） 位置/觸點數(shù):2 導線，2 觸點 內(nèi)部開關:不包括開關 安裝類型:自由懸掛 端子:壓縮 屏蔽:無屏蔽 特點:- 色彩 - 觸頭:金 觸點材料:- 觸點材料 - 鍍層:- 體座材料:- 體座顏色:銀 工作溫度:- 電壓 - 額定:- 額定電流:- 包裝:散裝 |
發(fā)布緊急采購，3分鐘左右您將得到回復。