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參數(shù)資料
| 型號： | SP331ET-L |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 13/13頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX RS232/485 PROG 28WSOIC |
| 標準包裝： | 27 |
| 類型： | 收發(fā)器 |
| 驅(qū)動器/接收器數(shù)： | 4/4 |
| 規(guī)程： | RS232，RS485 |
| 電源電壓： | 5V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 28-SOIC W |
| 包裝： | 管件 |
| 其它名稱： | 1016-1134-5 |
9
Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-707 www.exar.com
SP33_00_0260
to ground and transfers the generated l0V
across C
2 to C4, the VDD storage capacitor.
Again, simultaneously with this, the positive
side of capacitor 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 gen-
erated from V
CC in a no–load condition, V+
and V– will be symmetrical. Older charge
pump approaches that generate V– from
V+ will show a decrease in the magnitude
of V– compared to V+ due to the inherent
inefficiencies in the design.
The clock rate for the charge pump typically
operates at 5kHz. The external capaci-
tors must be 0.F with a 6V breakdown
rating.
External Power Supplies
For applications that do not require +5V only,
external supplies can be applied at the V+
and V– pins. The value of the external sup-
ply voltages must be no greater than ±l0V.
The current drain for the ±0V supplies is
used for RS-232. For the RS-232 driver the
current requirement will be 3.5mAper driver.
The external power supplies should provide
a power supply sequence of :+l0V, then +5V,
followed by –l0V.
VCC = +5V
–5V
+5V
VSS Storage Capacitor
VDD Storage Capacitor
C1
C2
C3
C4
+
–
VCC = +5V
–10V
VSS Storage Capacitor
VDD Storage Capacitor
C1
C2
C3
C4
+
–
VCC = +5V
–5V
+5V
–5V
VSS Storage Capacitor
VDD Storage Capacitor
C1
C2
C3
C4
+
–
VCC = +5V
+10V
VSS Storage Capacitor
VDD Storage Capacitor
C1
C2
C3
C4
+
–
Figure . Charge Pump Phase .
Figure 2. Charge Pump Phase 2.
Figure 3. Charge Pump Phase 3.
Figure 4. Charge Pump Phase 4.
+10V
GND
-10V
a) C2+
b) C2-
Figure 5. Charge Pump Waveforms
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP331ET-L/TR | 功能描述:RS-232接口集成電路 Programmable RS-232/RS-485 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: |
| SP331K | 制造商:CDE 制造商全稱:Cornell Dubilier Electronics 功能描述:Ceramic Capacitors |
| SP332 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:RS-232/RS-485 Multi-Mode Serial Transceiver |
| SP3-3-20 | 制造商:RHOMBUS-IND 制造商全稱:Rhombus Industries Inc. 功能描述:SP3 Series Mini-SIP Passive Delay Modules |
| SP332-B4 | 制造商:Leviton Manufacturing Co 功能描述: |
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