- 您现在的位置：买卖IC网 > PDF目录10206 > SP208ET-L/TR (Exar Corporation)IC TXRX RS232 SERIAL 24WSOIC PDF资料下载
参数资料
| 型号： | SP208ET-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 11/14页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS232 SERIAL 24WSOIC |
| 标准包装： | 1,500 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 4/4 |
| 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： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC W |
| 包装： | 带卷 (TR) |
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.
相关PDF资料 |
PDF描述 |
|---|---|
| AD7853BRZ-REEL | IC ADC 12BIT SRL 200KSPS 24SOIC |
| LTC2382IDE-16#PBF | IC ADC 16BIT 1CH 500KSPS 16-DFN |
| LTC2382IMS-16#PBF | IC ADC 16BIT 1CH 500KSPS 16-MSOP |
| 14181-7SG-300 | CONN RCPT 7POS PNL MNT SKT |
| AD7893AR-10REEL | IC ADC 12BIT SRL T/H LP 8-SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SP208R25JLF | 制造商:TT Electronics / IRC 功能描述:SP208R25JLF |
| SP208R25KLF | 制造商:TT Electronics / IRC 功能描述:SP208R25KLF |
| SP208R66KLF | 制造商:TT Electronics / IRC 功能描述:SP208R66KLF |
| SP2090R9JLF | 制造商:TT Electronics / IRC 功能描述:SP2090R9JLF |
| SP209100JLF | 制造商:TT Electronics / IRC 功能描述:SP209100JLF |
发布紧急采购，3分钟左右您将得到回复。