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參數(shù)資料
| 型號(hào)： | SP207CA-L/TR |
| 廠商： | Exar Corporation |
| 文件頁(yè)數(shù)： | 10/14頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX RS232 SERIAL 24SSOP |
| 產(chǎn)品變化通告： | Interface Product Discontinuation 10/May/2011 |
| 標(biāo)準(zhǔn)包裝： | 1,500 |
| 類(lèi)型： | 收發(fā)器 |
| 驅(qū)動(dòng)器/接收器數(shù)： | 5/3 |
| 規(guī)程： | RS232 |
| 電源電壓： | 4.5 V ~ 5.5 V |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 24-SSOP（0.209"，5.30mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 24-SSOP |
| 包裝： | 帶卷 (TR) |
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Exar Corporation 48720 Kato Road, Fremont CA, 94538 (50)668-7000 Fax (50)668-707 www.exar.com SP206, 207, 208, 2_0_060
DESCRIPTION
FEATURES
The SP206/207/208/2 multi-channel RS-232
line transceivers provide a variety of configu-
rations to fit most communication needs, es-
pecially those applications where +/-2V is not
available. All models in this series feature low-
power CMOS construction and Exar's proprie-
tary on-board charge pump circuitry to generate
the +/-0V RS-232 voltage levels. The ability to
use 0.F charge pump capacitors saves board
space and reduces circuit cost. Different mod-
els within the series provide different driver/re-
ceiver combinations to match any application
requirement.
The SP206 and SP2 models feature a low-
power shutdown mode that reduces power sup-
ply drain to A.
The models in this series are available in 24-pin
and 28-pin SO (wide) and SSOP (shrink) small
outline packages. Devices can be specified for
commercial (0C to +70C) or industrial/extend-
ed (-40C to +85C) operating temperatures.
THEORY OF OPERATION
CHARgE PUMP
The charge pump is an Exar patented design
and uses a unique approach compared to older
less-efficient designs. The charge pump still
requires four external capacitors, but uses a
four phase voltage shifting technique to attain
symmetrical +/-0V power supplies. Figure a
shows the waveform found on the positive side
of capacitor C2 and Figure 3b shows the nega-
tive side of capacitor C2. There is a free-run-
ning oscillator that controls the four phases of
the voltage shifting. A description of each phase
follows:
PHASE 1
Vss charge storage - During this phase of the
clock cycle, the positive side of capacitors C
and C2 are initially charged to +5V. C+ is then
switched to ground and the charge in C- is
transferred to C2-. Since C2+ is connected to
+5V, the voltage potential across capacitor C2
is now 0V.
PHASE 2
Vss transfer: Phase two of the clock connects
the negative terminal of C2 to the Vss stor-
age capacitor and the positive terminal of C2
to ground, and transfers the generated -0V to
C3. Simultaneously, the positive side of capaci-
tor C is switched to +5V and the negative side
is connected to ground.
PHASE 3
Vdd charge storage: The third phase of the
clock is identical to the first phase. The charge
transferred in C produces -5V in the negative
terminal of C, which is applied to the negative
side of C2. Since C2+ is at +5V, the voltage po-
tential across C2 is 0V.
PHASE 4
Vdd transfer: The fourth phase of the clock con-
nects the negative terminal of C2 to ground,
and transfers the generated 0V across C2 to
C4, the Vdd storage capacitor. Again, simulta-
neously with this, the positive side of capaci-
tor C is switched to +5V and the negative side
is connected to ground, and the cycle begins
again.
Since both V+ and V- are separately generated
from Vcc; in a no-load condition V+ and V- will
be symmetrical. Older charge pump approach-
es that generate V- from V+ will show a de-
crease in magnitude of V- compared to V+ due
to the inherent inefficiencies in the design.
The clock rate for the charge pump typically op-
erates at greater than 5kHz allowing the pump
to run efficiently with small 0.1uF capacitors
with a 6V breakdown voltage rating.
The SP206/207/208/2 devices are made up
of three basic circuit blocks - ) transmitter/
driver, 2) receiver and 3) charge pump. Each
model within the series incorporates variations
of these circuit to achieve the desired configu-
ration and performance.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP207CP | 制造商:SIPEX 制造商全稱(chēng):Sipex Corporation 功能描述:+5V High-Speed RS-232 Transceivers with 0.1mF Capacitors |
| SP207CP-L | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| SP207CT | 制造商:SIPEX 制造商全稱(chēng):Sipex Corporation 功能描述:+5V High-Speed RS-232 Transceivers with 0.1mF Capacitors |
| SP207CT/TR | 制造商:SIPEX 制造商全稱(chēng):Sipex Corporation 功能描述:+5V High-Speed RS-232 Transceivers with 0.1mF Capacitors |
| SP207CT-L | 功能描述:RS-232接口集成電路 5V 5-DRVR/3-RCVR RS-232 0-70C 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(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
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