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參數(shù)資料
| 型號： | SP207EET-L |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 17/19頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX RS232 ESD LP 24SOIC |
| 標準包裝： | 31 |
| 類型： | 收發(fā)器 |
| 驅動器/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： | 管件 |
7
Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-707 www.exar.com
SP207E_0_052
The Exar charge-pump generates V+ and V-
independently from V
CC. Hence in a no–load
condition V+ and V- will be symmetrical.
Older charge pump approaches generate
V+ and then use part of that stored charge
to generate V-. Because of inherent losses,
the magnitude of V- will be smaller than V+
on these older designs.
Underlightlyloadedconditionstheintelligent
pump oscillator maximizes efficiency by
running only as needed to maintain V+ and
V-. Since interface transceivers often spend
muchoftheirtimeatidle,thispower-efficient
innovation can greatly reduce total power
consumption. This improvement is made
possiblebytheindependentphasesequence
of the Exar charge-pump design.
The clock rate for the charge pump typically
operates at greater than 15kHz, allowing
thepumptorunefficientlywithsmall0.1F
capacitors.Efficientoperationdependson
rapidly charging and discharging C
and
C
2, therefore capacitors should be mounted
closetotheICandhavelowESR(equivalent
seriesresistance).Lowcostsurfacemount
ceramiccapacitors(suchasarewidelyused
forpower-supplydecoupling)areidealfor
use on the charge pump.
However the charge pumps are designed
to be able to function properly with a wide
range of capacitor styles and values. If
polarizedcapacitorsareused,thepositive
and negative terminals should be connected
as shown.
Figure 4. Charge Pump — Phase 4
VCC = +5V
+10V
VSS Storage Capacitor
VDD Storage Capacitor
C1
C2
C3
C4
+
–
+7V
Voltage potential across any of the capaci-
tors will never exceed 2 x V
CC. Therefore
capacitors with working v
oltages as low as
0V rating may be used with a nominal V
CC
supply. C
will never see a potential greater
than V
CC , so a working voltage of 6.3V is
adequate. The reference terminal of the
V
DD capacitor may be connected either to
V
CC or ground, but if connected to ground a
minimum 6V working voltage is required.
Higherworkingvoltagesand/orcapacitance
values may be advised if operating at higher
V
CC or to provide greater stability as the
capacitors age.
+7V
a) C
2
+
gND
b) C
2
–
–7V
Figure 5. Typical waveforms seen on ca-
pacitor C2 when all drivers are at maximum
load.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SP207EET-L/TR | 功能描述:RS-232接口集成電路 +/-15KV 5DRVR/3RCVR 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: |
| SP207EET-TR | 制造商:Exar Corporation 功能描述: |
| SP207EH | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High Speed +5V High Performance RS232 Transceivers |
| SP207EHCA | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High Speed +5V High Performance RS232 Transceivers |
| SP207EHCA-L | 制造商:Exar Corporation 功能描述:TRANSCEIVER RS-232 HI SPEED 207 |
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