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| 型号： | SP2209EEY-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 17/17页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS232 DUAL PORT 38TSSOP |
| 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： | 6/10 |
| 规程： | RS232 |
| 电源电压： | 10.8 V ~ 13.2 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 38-TFSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 38-TSSOP |
| 包装： | 带卷 (TR) |
Exar Corporation 48720 Kato Road, Fremont CA, 94538 510-668-7017 www.exar.com
SP2209E_100_071612
9
One receiver in each RS-232 port can be
kept active by a low current, +3.3V to +5V
power supply while the rest of the channels
arepowereddown.Thisallowsthe
SP2209E
device to monitor peripheral devices while
the rest of the system is in a power-saving
standby mode. The
SP2209E device can
be implemented as a power management
device to wake up the entire system when
any communication is initiated in peripheral
devices. The
SP2209E device has a low
standby current of 100A.
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
and inputs with slow transition times.
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 requires two
external capacitors using a two-phase volt-
ageshiftingtechniquewitha200kHzinternal
oscillator to attain a -9V power supply. Refer
to Figure 7 for the internal charge pump
circuit. The internal power supply consists
of a charge pump that provides output volt-
ages of at least +/-5V regardless of the input
voltage (V
DD). This is important to maintain
compliantRS-232levelsregardlessofpower
supply fluctuations. A description of each
phase follows.
Figure 7. Charge Pump Circuit
DESCRIPTION
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