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參數(shù)資料
| 型號： | SP213ECA-L/TR |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 16/19頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX RS232 SERIAL 28SSOP |
| 標(biāo)準(zhǔn)包裝： | 1,500 |
| 類型： | 收發(fā)器 |
| 驅(qū)動器/接收器數(shù)： | 4/5 |
| 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： | 28-SSOP（0.209"，5.30mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 28-SSOP |
| 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
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP213ECT | 制造商:Exar Corporation 功能描述:Line Transceiver, 4-Driver, 5-Receiver, 28 Pin, Plastic, SOP |
| SP213ECT/TR | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| SP213ECT-L | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| SP213ECT-L/TR | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| SP213EEA | 制造商:Exar Corporation 功能描述: 制造商:SIPEX 功能描述: 制造商:Exar Corporation 功能描述:Line Transceiver, 4-Driver, 5-Receiver, 28 Pin, Plastic, SSOP |
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