- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄1968 > SP320ACM-L (Exar Corporation)IC TXRX RS232 V.35 80LQFP PDF資料下載
參數(shù)資料
| 型號： | SP320ACM-L |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX RS232 V.35 80LQFP |
| 標準包裝： | 84 |
| 類型： | 收發(fā)器 |
| 驅動器/接收器數(shù)： | 7/7 |
| 規(guī)程： | RS232 |
| 電源電壓： | 5V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 80-LQFP |
| 供應商設備封裝： | 80-LQFP（14x14） |
| 包裝： | 托盤 |
5
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (50) 668-707 www.exar.com
SP320_00_092208
phase 4
-Vdd transfer- The fourth phase of the clock
connects the negative terminal of C2 to
ground and transfers the generated +0V
across C2 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 gener-
ated from Vcc 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 ofV-com-
pared 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.
shutdown Mode
The SP320 can be put into a low power
shutdown mode by bringing both TS000 (pin
3)andENV35(pin9)low.Inshutdownmode,
the SP320 will draw less than 2mAof supply
current. For normal operation, both pins
should be connected to +5V.
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 supply
voltages must be no greater than ±0V.
The current drain from the ±0V sup-
plies is used for the RS-232 drivers.
For the RS-232 driver the current re-
quirement will be 3.5mA per driver.
It is critical the external power supplies
provide a power supply sequence of : +0V,
+5V, and then -0V.
Applications information
TheSP320isasinglechipdevicethatcanim-
plement a complete V.35 interface.Three (3)
V.35 drivers and three (3) V.35 receivers are
used for clock and data signals and four (4)
RS-232 (V.28) drivers and four (4) RS-232
(V.28) receivers can be used for the control
signals of the interface. The following ex-
amples show the SP320 configured in either
a DTE or DCE application.
+0V
a) C
2
+
GND
b) C
2
–
–0V
Figure . Charge Pump Waveforms
capacitors, but uses a four-phase voltage
shiftingtechniquetoattainsymmetrical±0V
powersupplies.Thecapacitorscanbeaslow
as 0.F with a 6 Volt rating. Polarized or
non-polarized capacitors can be used.
Figure (a) shows the waveform found on
the positive side of capacitor C2, and Figure
(b)showsthenegativesideofcapacitorC2.
Thereisafree-runningoscillatorthatcontrols
the four phases of the voltage shifting. A
description of each phase follows.
phase 1
-Vss charge storage- During this phase of
theclockcycle,thepositivesideofcapactors
C and C2 are initially charged to +5V. C+
is then switched to ground and the charge in
C- is transferred to C2-. Since C2+ is con-
nected to +5V, the voltage potential across
capacitor C2 is now 0V.
phase 2
-Vss transfer- Phase two of the clock con-
nects the negative terminal of C2 to the Vss
storage capacitor and the positive terminal
of C2 to ground, and transfers the generated
-0V to C3. Simultaneously, the positive side
of capacitor C is switched to +5V and the
negative side is connected to ground.
phase 3
-Vdd charge storage- The third phase of
the clock is identical to the first phase- the
transferred charge in C produces -5V in
the negative terminal of C, which is applied
to the negative side of capacitor C2. Since
C2+ is at +5V, the voltage potential across
C2 is +0V.
相關PDF資料 |
PDF描述 |
|---|---|
| SP3222EET-L/TR | IC TXRX RS232 ESD TRUE 18WSOIC |
| SP3223EUEY-L | IC TXRX RS232 INTELLIGNT 20TSSOP |
| SP3232EBEP-L | IC TXRX RS232 ESD TRUE 16DIP |
| SP3232EHET-L/TR | IC TXRX RS232 ESD 16WSOIC |
| SP3232EUCT-L/TR | IC TXRX RS232 ESD 16WSOIC |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SP3-2-10 | 制造商:RHOMBUS-IND 制造商全稱:Rhombus Industries Inc. 功能描述:SP3 Series Mini-SIP Passive Delay Modules |
| SP-3215 | 功能描述:SPEAKER 83 DB SENSITIVITY 31.7 D 制造商:soberton inc. 系列:SP 微型揚聲器 包裝:托盤 零件狀態(tài):在售 技術:磁性 類型:通用 頻率范圍:1.2kHz ~ 20kHz 頻率 - 自諧振:1200Hz 阻抗:8 Ohms 效率 - dBA:83 效率 -?測試:100mm 效率 -?類型:聲壓級?(SPL) 功率 - 額定值:200mW 功率 - 最大值:300mW 端口位置:頂部 形狀:圓形 材料 - 錐體:聚酯，聚對苯二甲酸乙二醇酯（PET） 材料 - 磁鐵:鐵氧體 侵入防護:- 等級:- 端接:PC 引腳 大小/尺寸:1.248" 直徑（31.70mm） 高度 - 安裝（最大值）:0.591"（15.00mm） 標準包裝:136 |
| SP-3216-FF-2.5A | 制造商:Cooper Bussmann 功能描述: |
| SP-3216-FF-2A | 制造商:Cooper Bussmann 功能描述: |
| SP-3216-FF-4A | 制造商:Cooper Bussmann 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復。
