參數(shù)資料
型號(hào)： SP213EEA-L
廠商： Exar Corporation
文件頁(yè)數(shù)： 17/19頁(yè)
文件大?。?/td> 0K
描述： IC TXRX RS232 ESD LP 28SSOP
標(biāo)準(zhǔn)包裝： 46
類(lèi)型： 收發(fā)器
驅(qū)動(dòng)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(lèi)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： 管件
其它名稱(chēng)： 1016-1018-5
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(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SP213EEA-L 制造商:Exar Corporation 功能描述:TRANSCEIVER, RS232, 230KBPS, 5V, SSOP-28; Device Type:RS232 Transceiver; IC Interface Type:RS232; No. of Drivers:4; Supply Voltage Min:4.75V; Supply Voltage Max:5.25V; Driver Case Style:SSOP; No. of Pins:28 ;RoHS Compliant: No
SP213EEA-L/TR 功能描述:RS-232接口集成電路 5V 4-DRVR/5-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(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
SP213EET 制造商:SIPEX 制造商全稱(chēng):Sipex Corporation 功能描述:+5V High Performance RS232 Transceivers
SP213EET-L 制造商:EXAR 制造商全稱(chēng):EXAR 功能描述:Low Power, High ESD +5V RS-232 Transceivers
SP213EH 制造商:SIPEX 制造商全稱(chēng):Sipex Corporation 功能描述:High Speed +5V High Performance RS232 Transceivers
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