- 您现在的位置：买卖IC网 > PDF目录10232 > SP232ACT-L/TR (Exar Corporation)IC DVR/RCVR RS232 5V SGL 16WSOIC PDF资料下载
参数资料
| 型号： | SP232ACT-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 6/10页 |
| 文件大小： | 0K |
| 描述： | IC DVR/RCVR RS232 5V SGL 16WSOIC |
| 标准包装： | 1,500 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 2/2 |
| 规程： | RS232 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 16-SOIC W |
| 包装： | 带卷 (TR) |
| 其它名称： | SP232ACT-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
相关PDF资料 |
PDF描述 |
|---|---|
| CXC3102A16S8S | CONN RCPT 5POS PNL MNT SKT |
| VI-23R-IW-S | CONVERTER MOD DC/DC 7.5V 100W |
| LTC1410CG | IC A/D CONV 12BIT SAMPLNG 28SSOP |
| MS3106A24-11S | CONN PLUG 9POS STRAIGHT W/SCKT |
| LTC1409CG#PBF | IC A/D CONV 12BIT SAMPLNG 28SSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SP232ACX | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Enhanced RS-232 Line Drivers/Receivers |
| SP232AEN | 制造商:Exar Corporation 功能描述: |
| SP232AEN/TR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Enhanced RS-232 Line Drivers/Receivers |
| SP232AEN-L | 功能描述:RS-232接口集成电路 RS232 ESD 2KV temp -40C to 85C RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| SP232AEN-L/TR | 功能描述:RS-232接口集成电路 5V SNGL SUPPLY RS-232 -40-85C RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
发布紧急采购，3分钟左右您将得到回复。