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参数资料
| 型号： | SP3222EUEY-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 20/20页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS232 ESD TRUE 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： | 2/2 |
| 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) |
| 其它名称： | SP3222EUEY-L/TR-ND |
Exar Corporation 48720 Kato Road, Fremont CA, 94538 510-668-7017 www.exar.com
SP3222EU/SP3232EU_102_031413
9
Since receiver input is usually from a trans-
mission line where long cable lengths and
system interference can degrade the signal,
the inputs have a typical hysteresis margin
of 300mV. This ensures that the receiver
is virtually immune to noisy transmission
lines. Should an input be left unconnected,
an internal 5k pulldown resistor to ground
will commit the output of the receiver to a
HIGH state.
Charge Pump
The charge pump is an Exar-patended
design (U.S. 5,306,954) and uses a unique
approach compared to older less-efficient
designs. The charge pump still requires four
external capacitors, but uses a four-phase
voltage shifting technique to attain sym-
metrical 5.5V power supplies. The internal
power supply consists of a regulated dual
charge pump that provides output voltages
of +/-5.5V regardless of the input voltage
(Vcc) over the +3.0V to +5.5V range.
In most circumstances, decoupling the
power supply can be achieved adequately
using a 0.1F bypass capacitor at C5 (refer
to figures 9 and 10). In applications that are
sensitive to power-supply noise, decouple
Vcc to ground with a capacitor of the same
value as charge-pump capacitor C1. Physi-
cally connect bypass capcitors as close to
the IC as possible.
Table 2. SP3222EU Truth Table Logic for Shutdown
and Enable Control
Figure 11. SP3222EU/SP3232EU Driver Loopback
Test Circuit
Figure 13. Loopback Test results at 1000kbps
Figure 12. Loopback Test results at 250kbps
SP3222EU
SP3232EU
GND
TxIN
TxOUT
C1+
C1-
C2+
C2-
V+
V-
VCC
0.1F
+
C2
C5
C1
+
C3
C4
+
0.1F
LOGIC
INPUTS
VCC
5k
RxIN
RxOUT
LOGIC
OUTPUTS
EN*
*SHDN
250pF or 1000pF
VCC
* SP3222EU only
SHDN
EN
TxOUT
RxOUT
0
Tri-state
Active
0
1
Tri-state
1
0
Active
1
Active
Tri-state
DESCRIPTION
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP3222EY | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:True +3.0V to +5.5V RS-232 Transceivers |
| SP3222EY-L | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| SP3222H | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:3.3V, 460 Kbps RS-232 Transceivers |
| SP3222HCA | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:3.3V, 460 Kbps RS-232 Transceivers |
| SP3222HCP | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:3.3V, 460 Kbps RS-232 Transceivers |
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