參數(shù)資料
型號： SP208ECT-L/TR
廠商： Exar Corporation
文件頁數(shù)： 16/19頁
文件大?。?/td> 0K
描述： IC TXRX RS232 ESD LP 24SOIC
標準包裝： 1,500
類型： 收發(fā)器
驅(qū)動器/接收器數(shù)： 4/4
規(guī)程： RS232
電源電壓： 4.5 V ~ 5.5 V
安裝類型： 表面貼裝
封裝/外殼： 24-SOIC（0.295"，7.50mm 寬）
供應商設備封裝： 24-SOIC W
包裝： 帶卷 (TR)
Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-707 www.exar.com
SP207E_0_052
6
Receiver input thresholds are between .2
to .7 volts typical. This allows the receiver
todetectstandardTTLorCMOSlogic-level
signals as well as RS-232 signals. If a re-
ceiver input is left unconnected or un-driven,
a5kpulldownresistortogroundwillcommit
the receiver to a logic- output state.
Highly Efficient Charge–Pump
The onboard dual-output charge pump is
usedtogeneratepositiveandnegativesignal
voltagesfortheRS-232drivers. Thisenables
fullycompliantRS-232andV.28signalsfrom
a single power supply device.
The charge pumps use four external capaci-
tors to hold and transfer electrical charge.
The
Exar design uses a unique approach
comparedtoolder,less–efficientdesigns.
The pumps use a four–phase voltage shift-
ing technique to attain symmetrical V+ and
V- power supplies. An intelligent control
oscillator regulates the operation of the
chargepumptomaintainthepropervoltages
atmaximumefficiency.
Phase 1
V
SS charge store and double — The positive
terminalsofcapacitorsC
and C2 are charged
from V
CC with their negative terminals initially
connected to ground. C
l+ is then connected
to ground and the stored charge from C
– is
superimposed onto C
2
–. Since C
2+ is still
connectedtoV
CC the voltage potential across
capacitor C
2 is now 2 x VCC.
VCC = +5V
–5V
+5V
VSS Storage Capacitor
VDD Storage Capacitor
C1
C2
C3
C4
+
–
Phase 2
— V
SS transfer and invert — Phase two con-
nects the negative terminal of C
2 to the VSS
storage capacitor and the positive terminal
of C
2 to ground. This transfers the doubled
andinverted(V-)voltageontoC
3. Meanwhile,
capacitor C
charged from VCC to prepare it
for its next phase.
Phase 3
V
DD charge store and double —Phase three
isidenticaltothefirstphase.Thepositive
terminalsofcapacitorsC
and C2 are charged
from V
CC with their negative terminals initially
connected to ground. C
l+ is then connected
to ground and the stored charge from C
– is
superimposed onto C
2–. Since C2+ is still
connectedtoV
CC the voltage potential across
capacitor C
2 is now 2 x VCC.
Phase 4
V
DD transfer — The fourth phase connects
the negative terminal of C
2 to ground and
the positive terminal of C
2 to the VDD stor-
age capacitor. This transfers the doubled
(V+)voltageontoC
4. Meanwhile, capacitor
C
is charged from VCC to prepare it for its
next phase.
Figure . Charge Pump — Phase
VCC = +5V
VSS Storage Capacitor
VDD Storage Capacitor
C1
C2
C3
C4
+
–
-7V
Figure 2. Charge Pump — Phase 2
VCC = +5V
–5V
+5V
VSS Storage Capacitor
VDD Storage Capacitor
C1
C2
C3
C4
+
–
Figure 3. Charge Pump — Phase 3
相關PDF資料
PDF描述
SP208ECA-L/TR IC TXRX RS232 ESD LP 24SSOP
LTC1279CSW#TRPBF IC A/DCONV SAMPLNG W/SHTDN24SOIC
SP208EA-L/TR IC TXRX RS232 SERIAL 24SSOP
LTC1279CSW#TR IC ADC 12BIT SAMPL SHTDWN 24SOIC
SP208CT-L/TR IC TXRX RS232 SERIAL 24WSOIC
相關代理商/技術參數(shù)
參數(shù)描述
SP208EEA 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:+5V High Performance RS232 Transceivers
SP208EEA-L 功能描述:RS-232接口集成電路 RS232 4Tx/4Rx temp -40C to 85C 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:
SP208EEA-L 制造商:Exar Corporation 功能描述:IC RS-232 TRANSCEIVER 5.5V SSOP-24 制造商:Exar Corporation 功能描述:IC, RS-232 TRANSCEIVER, 5.5V, SSOP-24
SP208EEA-L/TR 功能描述:RS-232接口集成電路 5V 4-DRVR/4-RCVR RS-232 -40-85C 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:
SP208EEP 制造商:Exar Corporation 功能描述:Line Transceiver, 4-Driver, 4-Receiver, 24 Pin, Plastic, DIP
發(fā)布緊急采購，3分鐘左右您將得到回復。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*