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| 型号： | SP3232ECP-L |
| 厂商： | Exar Corporation |
| 文件页数： | 23/23页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS232 ESD TRUE 16PDIP |
| 标准包装： | 25 |
| 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： | 通孔 |
| 封装/外壳： | 16-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 16-PDIP |
| 包装： | 管件 |
| 其它名称： | 1016-1103-5 |
Exar Corporation 48720 Kato Road, Fremont CA, 94538 510-668-7017 www.exar.com
SP3222E/SP3232E_101_031413
9
Receivers
The Receivers convert EIA/TIA-232 levels
to TTL or CMOS logic output levels. The
SP3222Ereceivershaveaninvertingtri-state
output. These receiver outputs (RxOUT)
are tri-stated when the enable control EN =
HIGH. In the shutdown mode, the receivers
can be active or inactive. EN has no effect on
TxOUT. The truth table logic of the
SP3222E
driver and receiver outputs can be found in
Table 2.
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.
Table 2. SP3222E Truth Table Logic for Shutdown
and Enable Control
Figure 8. SP3222E/SP3232E Driver Loopback Test
Circuit
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.
Figure 10. Loopback Test results at 235kbps
3
1
2
T
[
]
T1 IN
T1 OUT
R1 OUT
Ch1
Ch3
5.00V Ch2 5.00V M 2.50s Ch1
0V
5.00V
Figure 9. Loopback Test results at 120kbps
3
1
2
T
[
]
T1 IN
T1 OUT
R1 OUT
Ch1
Ch3
5.00V Ch2 5.00V M 5.00s Ch1
0V
5.00V
SP3222E
SP3232E
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
1000pF
VCC
* SP3222E 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 |
|---|---|
| SP3232ECT | 制造商:Exar 功能描述:Dual Transmitter/Receiver RS-232 16-Pin SOIC W 制造商:Exar 功能描述:Dual Transmitter/Receiver RS-232 16-Pin SOIC W Bulk |
| SP3232ECT/TR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:True +3.0V to +5.5V RS-232 Transceivers |
| SP3232ECT-L | 功能描述:RS-232接口集成电路 RS232 120 kbps temp 0C to 70C 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: |
| SP3232ECT-L/TR | 功能描述:RS-232接口集成电路 TRUE +3V-+5.5V RS-232 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: |
| SP3232ECY | 制造商:Exar Corporation 功能描述: |
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