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參數(shù)資料
| 型號： | SP232AEN-L/TR |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 6/10頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DVR/RCVR RS232 5V SGL 16NSOIC |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 收發(fā)器 |
| 驅(qū)動器/接收器數(shù)： | 2/2 |
| 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： | 16-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SOIC N |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | SP232AEN-L/TR-ND |
5
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (50)668-7000 Fax (50)668-707 www.exar.com
SP232A_00_05308
DESCRiPTion
Phase 4
Vdd transfer. The fourth phase connects the
negative terminal of C2 to ground and the posi-
tive terminal of C2 to the Vdd storage capacitor .
This transfers the doubled (V+) voltage onto C3.
Meanwhile, capacitor C is charged from Vcc to
prepare it for its next phase.
Under lightly loaded conditions, the intelligent
pump oscillator maximizes efficiency by running
only as needed to maintain V+ and V- voltage
levels. Since interface transceivers spend most
of their time at idle, this power-efficient innova-
tion can greatly reduce total power consump-
tion. This improvement is made possible by
the independent phase sequences of the Exar
charge pump design.
The clock rate of the charge pump typically op-
erates greater than 70kHz allowing the pump to
operate efficiently with small 0.1uF capacitors.
Efficient operation depends on rapid charging
and discharging of C and C2. Therefore, the
capacitors should be mounted as close as pos-
sible to the IC and have a low ESR (equivalent
series resistance). Inexpensive, surface mount
ceramic capacitors are ideal for use on charge
pump. If polarized capacitors are used the posi-
tive and negative terminals should be connect-
ed as shown on the typical operating circuit. A
diagram of the 4 individual phases is shown in
Figure .
C
2
+
-
V
CC
C
3
C
4
C
1
+
e-
Phases 1 and 3: Store/Double.
Double charge from C1 onto C2.
C2 is now charged to -2xVcc
+
C
2
+
-
V
CC
C
3
C
4
C
1
+
e-
+
e+
C
2
+
-
V
CC
C
3
C
4
C
1
+
Phase 2 – Vss transfer from C2 to C4.
Meanwhile C1 is charged to Vcc
e-
+
Vss
transfer from C2 to C3.
Meanwhile C1 is charged to Vcc
V
DD
V-
V+
V-
V+
Patented 5,306,954
Phase 4 VDD
Figure . Charge pump phases
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP232AEP | 制造商:EXAR 制造商全稱:EXAR 功能描述:Enhanced RS-232 Line Drivers/Receivers |
| SP232AEP-L | 功能描述:RS-232接口集成電路 RS232 ESD 2KV 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(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| SP232AEP-L/TR | 制造商:EXAR 制造商全稱:EXAR 功能描述:Enhanced RS-232 Line Drivers/Receivers |
| SP232AET | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Enhanced RS-232 Line Drivers/Receivers |
| SP232AET/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Enhanced RS-232 Line Drivers/Receivers |
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