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| 型号： | SP211CA-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 11/14页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS232 SERIAL 28SSOP |
| 标准包装： | 1,500 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 4/5 |
| 规程： | RS232 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 28-SSOP |
| 包装： | 带卷 (TR) |
| 其它名称： | SP211CA-L/TR-ND |
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (50)668-7000 Fax (50)668-707 www.exar.com SP206, 207, 208, 2_0_060
6
DESCRIPTION
RECEIVERS
The receivers convert RS-232 input signals to
inverted TTL signals. Since the input is usu-
ally from a transmission line where long cable
length and system interference can degrade
the signal, the inputs have a typical hysteresis
margin of 500mV. This ensures that the re-
ceiver is virtually immune to noisy transmission
lines. Should an input be left unconnected, an
internal 5kohm pull-down resistor to ground will
commit the output of the receiver to a HIGH
state.
SHUTDOWN MODE
The SP206 and SP2 feature a control input
(SD) which will disable the device and reduce
the power supply current to less than 0A,
making the parts ideal for battery-powered sys-
tems. In the "shutdown" mode the receivers
and transmitters will both be tri-stated. The V+
output of the charge pump will discharge to Vcc
and the V- output will discharge to ground.
ENAblE (EN)
The SP206 and SP2 feature an enable input
which allows the receiver outputs to be either
tri-stated or enabled. This can be especially
useful when the receiver is tied directly to a
microprocessor data bus. The enable pin is
active high.
Figure . Charge Pump Waveforms
+0V
-0V
GND
a) C2+
b) C2+
VCC = +5V
–5V
+5V
VSS Storage Capacitor
VDD Storage Capacitor
C1
C2
C3
C4
+
–
Figure 2, Charge pump - Phase
TRANSMITTER/DRIVER
The drivers are inverting transmitters, which ac-
cept either TTL or CMOS inputs and output the
RS-232 output signals with an inverted sense
relative to the input logic levels. Typically, the
RS-232 output voltage swing is +/-9V with no
load, and +/-5V minimum with full load. The
transmitter outputs are protected against infi-
nite short-circuits to ground without degrada-
tion in reliability. The drivers of the SP206 and
SP2 can be tri-stated by using the SHUT-
DOWN function.
In the "power off" state, the output impedance
will remain greater than 300 Ohms, again satis-
fying the RS-232 specifications. Should the input
of the driver be left open, an internal 400kOhm
pull-up resistor to Vcc forces the input high, thus
committing the output to a low state. The slew
rate of the transmitter output is internally limited
to a maximum of 30V/s in order to meet he EIA
standards (EIA RS-232D 2,,7, Paragraph 5).
The transition of the loaded output from high to
low also meets the monotonicity requirements
of the standard.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP211CT | 制造商:Exar Corporation 功能描述: |
| SP211CT/TR | 制造商:Exar Corporation 功能描述: |
| SP211CT-L | 功能描述:RS-232接口集成电路 5V 4-DRVR/5-RCVR RS-232 0-70C 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: |
| SP211CT-L/TR | 功能描述:RS-232接口集成电路 5V 4-DRVR/5-RCVR RS-232 0-70C 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: |
| SP211E | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:+5V High Performance RS232 Transceivers |
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