参数资料
| 型号： | SP3203EEY-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 15/16页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS232 ESD 20TSSOP |
| 产品变化通告： | Packaging Change 15/Jul/2010 |
| 标准包装： | 1,500 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 3/2 |
| 规程： | RS232 |
| 电源电压： | 3 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 20-TSSOP |
| 包装： | 带卷 (TR) |
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (50)668-707 www.exar.com
SP3203E_00_2080
8
The charge pump operates in a discontinu-
ous mode using an internal oscillator. If the
output voltages are less than a magnitude
of 5.5V, the charge pump is enabled. If the
outputvoltages exceedamagnitudeof5.5V,
the charge pump is disabled. This oscillator
controls the four phases of the voltage shift-
ing. A description of each phase follows.
Phase 1
— V
SS charge storage — During this phase
of the clock cycle, the positive side of capaci-
tors C
and C2 are initially charged to VCC.
C
l
+
is then switched to GND and the charge
in C
–
is transferred to C
2
–
. Since C
2
+
is con-
nected to V
CC, the voltage potential across
capacitor C
2 is now 2 times VCC.
Phase 2
— V
SS transfer — Phase two of the clock
connectsthenegativeterminalofC
2 to the VSS
storagecapacitorandthepositiveterminalof
C
2 to GND. This transfers a negative gener-
ated voltage to C
3. This generated voltage is
regulated to a minimum voltage of -5.5V.
Simultaneous with the transfer of the volt-
age to C
3, the positive side of capacitor C
is switched to V
CC and the negative side is
connected to GND.
Phase 3
— V
DD charge storage — The third phase of
the clock is identical to the first phase — the
charge transferred in C
produces –VCC in
the negative terminal of C
, which is applied
to the negative side of capacitor C
2. Since
C
2
+
is at V
CC, the voltage potential across C2
is 2 times V
CC.
Table 2. SHUTDOWN Truth Tables
(Note: When the device is shutdown, the SP3203E's
charge pump is turned off and V+ decays to Vcc, V- is
pulledtogroundandthetransmitteroutputsaredisabled
as High Impedance.)
Figure 2. Loopback Test Circuit for RS-232 Driver
Data Transmission Rates
Phase 4
— V
DD transfer — The fourth phase of
the clock connects the negative terminal
of C
2 to GND, and transfers this positive
generated voltage across C
2 to C4, the
V
DD storage capacitor.
This voltage is
regulated to +5.5V. At this voltage, the in-
ternal oscillator is disabled. Simultaneous
with the transfer of the voltage to C
4, the
positivesideofcapacitorC
is switched to VCC
and the negative side is switched to GND, al-
lowingthechargepumpcycletobeginagain.
The charge pump cycle will continue as long
as the operational conditions for the internal
oscillator are present.
Since both V+ and V– are separately gener-
ated 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.
V
L Supply Level
Device: SP3203E
SHUTDOWN T
XOUT
R
XOUT
Charge
Pump
0
High-Z
Inactive
Active
SP3203E
1
3
5
4
2
6
19
GND
T1IN
TXIN
C1+
C1-
C2+
C2-
V+
V-
VCC
+
C2
C5
C1
+
C3
C4
+
0.1F
TTL/CMOS
INPUTS
+3V to +5V
18
SHUTDOWN
20
5K
R1OUT
5K
RXIN
RXOUT
TTL/CMOS
OUTPUTS
R1IN
TXOUT
T1OUT
VCC
1000pF
12
VL
+3V to +5.5V
0.1F
相关PDF资料 |
PDF描述 |
|---|---|
| SP320ACM-L | IC TXRX RS232 V.35 80LQFP |
| 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 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SP3203EY | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:3V RS-232 Serial Transceiver with Logic Selector |
| SP-320-48 | 功能描述:线性和开关式电源 321.6W 48V 6.7A W/PFC Function RoHS:否 制造商:TDK-Lambda 产品:Switching Supplies 开放式框架/封闭式:Enclosed 输出功率额定值:800 W 输入电压:85 VAC to 265 VAC 输出端数量:1 输出电压（通道 1）:20 V 输出电流（通道 1）:40 A 商用/医用: 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:Rack 长度: 宽度: 高度: |
| SP-3205 | 功能描述:SPEAKER (WITH FRAME) 99DB SENSIT 制造商:soberton inc. 系列:* 零件状态:在售 标准包装:200 |
| SP-320-5 | 功能描述:线性和开关式电源 275W 5V 55A W/PFC Function RoHS:否 制造商:TDK-Lambda 产品:Switching Supplies 开放式框架/封闭式:Enclosed 输出功率额定值:800 W 输入电压:85 VAC to 265 VAC 输出端数量:1 输出电压（通道 1）:20 V 输出电流（通道 1）:40 A 商用/医用: 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:Rack 长度: 宽度: 高度: |
| SP3-20-50 | 制造商:RHOMBUS-IND 制造商全称:Rhombus Industries Inc. 功能描述:SP3 Series Mini-SIP Passive Delay Modules |
发布紧急采购，3分钟左右您将得到回复。