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| 型号： | SP334CT-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 2/13页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS232/485 PROG 28WSOIC |
| 标准包装： | 1,500 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 3/5 |
| 规程： | RS232，RS485 |
| 电源电压： | 5V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 28-SOIC W |
| 包装： | 带卷 (TR) |
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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.
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参数描述 |
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| SP334ET | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Programmable RS-232/RS-485 Transceiver |
| SP334ET-L | 功能描述:RS-232接口集成电路 RS232/422/RS485 Transceiver Multi RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| SP334ET-L/TR | 功能描述:RS-232接口集成电路 Programmable RS232/ RS485 Transceiver RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| SP3-3-50 | 制造商:RHOMBUS-IND 制造商全称: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 类别:连接器，互连式 >> 套管 - 音频 系列:- 标准包装:1 系列:SealTite® 连接器类型:唱机（RCA）插座 类型:公头 信号线路:单声道 插头/配接插头直径:3.20mm 内径，9.00mm 外径（RCA） 位置/触点数:2 导线，2 触点 内部开关:不包括开关 安装类型:自由悬挂 端子:压缩 屏蔽:无屏蔽 特点:- 色彩 - 触头:金 触点材料:- 触点材料 - 镀层:- 体座材料:- 体座颜色:银 工作温度:- 电压 - 额定:- 额定电流:- 包装:散装 |
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