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参数资料
| 型号： | SP3223EUEY-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 2/20页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS232 INTELLIGNT 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) |
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (50)668-707 www.exar.com
SP3223E/EB/EU_0_06272
0
Receivers
The receivers convert ±5.0V EIA/TIA-232
levels to TTL or CMOS logic output levels.
Receivers have an inverting output that can
be disabled by using the EN pin.
Receivers are active when the AUTO ON-
LINE circuitry is enabled or when in shut-
down.Duringtheshutdown,thereceiverswill
continue to be active. If there is no activity
present at the receivers for a period longer
than00sorwhenSHUTDOWNisenabled,
the device goes into a standby mode where
the circuit draws A. Driving EN to a logic
HIGH forces the outputs of the receivers into
high-impedance. The truth table logic of the
SP3223 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 pull-down resistor to ground
will commit the output of the receiver to a
HIGH state.
Table 3. SHUTDOWN and EN Truth Tables
Note: In AUTO ON-LINE Mode where ONLINE = GND
and SHUTDOWN = V
CC, the device will shut down if
there is no activity present at the Receiver inputs.
Figure 4. Loopback Test Circuit for RS-232 Driver
Data Transmission Rates
Charge Pump
The charge pump 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 symmetrical
5.5V power supplies. The internal power
supply consists of a regulated dual charge
pump that provides output voltages of
+/-5.5V regardless of input voltage (V
CC)
over the +3.0V to +5.5V range. This
is important to maintain compliant RS-
232 levels regardless of power supply
fluctuations.
Figure 5. Loopback Test Circuit result at 250Kbps
(All Drivers Fully Loaded)
Device: SP3223
SHUTDOWN
EN
T
XOUT
R
XOUT
0
High Z
Active
0
High Z
0
Active
Active
High Z
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP3223EY | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Intelligent +3.0V to +5.5V RS-232 Transceivers |
| SP3223H | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Speed Intelligent +3.0V to +5.5V RS-232 Transceivers |
| SP3223HCA | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Speed Intelligent +3.0V to +5.5V RS-232 Transceivers |
| SP3223HCP | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Speed Intelligent +3.0V to +5.5V RS-232 Transceivers |
| SP3223HCY | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Speed Intelligent +3.0V to +5.5V RS-232 Transceivers |
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