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| 型号： | SP3243ECY-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 3/24页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS232 INTELLIGNT 28TSSOP |
| 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： | 3/5 |
| 规程： | RS232 |
| 电源电压： | 3 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 28-TSSOP |
| 包装： | 带卷 (TR) |
Exar Corporation 48720 Kato Road, Fremont CA, 94538 510-668-7017 www.exar.com
SP3243E_102_060611
11
The SP3243E devices have a patent pending
AUTO ON-LINE circuitry on board that saves
power in applications such as laptop computers,
palmtop (PDA) computers and other portable
systems.
The SP3243E devices incorporate an AUTO
ON-LINE circuit that automatically enables itself
when the external transmitters are enabled and
the cable is connected. Conversely, the AUTO
ON-LINE circuit also disables most of the inter-
nal circuitry when the device is not being used
and goes into a standby mode where the device
typically draws 1A. This function is externally
controlled by the ONLINE pin. When this pin is
tied to a logic LOW, theAUTO ON-LINE function
is active. Once active, the device is enabled until
there is no activity on the receiver inputs. The
receiver input typically sees at least +3V, which
are generated from the transmitters at the other
end of the cable with a +5V minimum.
Minimum recommended charge pump capacitor value
Input Voltage Vcc
Charge pump capacitor value for SP32XX
3.0V to 3.6V
C1 - C4 = 0.1F
4.5V to 5.5V
C1 = 0.047F, C2 - C4 = 0.33F
3.0V to 5.5V
C1 - C4 = 0.22F
When the external transmitters are disabled or
the cable is disconnected, the receiver inputs will
be pulled down by their internal 5k resistors to
ground. When this occurs over a period of time,
the internal transmitters will be disabled and the
device goes into a shutdown or standy mode.
When ONLINE is HIGH, the AUTO ON-LINE
mode is disabled.
The AUTO ON-LINE circuit has two stages:
1) Inactive Detection
2) Accumulated Delay
AUTO ONLINE CIRCUITRY
The Exar-patented charge pumps are designed
to operate reliably with a range of low cost
capacitors. Either polarized or non polarized
capacitors may be used. If polarized capacitors
are used they should be oriented as shown in
the Typical Operating Circuit. The V+ capaci-
tor may be connected to either ground or Vcc
(polarity reversed.)
The charge pump operates with 0.1F capacitors
for 3.3Voperation. Forothersupply voltages,see
the table for required capacitor values. Do not use
values smaller than those listed. Increasing the
capacitor values (e.g., by doubling in value)
reduces ripple on the transmitter outputs and
may slightly reduce power consumption. C2,
C3, and C4 can be increased without changing
C1’s value.
For best charge pump efficiency locate the
charge pump and bypass capacitors as close
as possible to the IC. Surface mount capacitors
are best for this purpose. Using capacitors with
lower equivalent series resistance (ESR) and
self-inductance, along with minimizing parasitic
PCB trace inductance will optimize charge pump
operation. Designersarealsoadvisedtoconsider
that capacitor values may shift over time and
operating temperature.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP3243EEA | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Intelligent +3.0V to +5.5V RS-232 Transceivers |
| SP3243EEA-L | 功能描述:RS-232接口集成电路 RS232 120 kbps temp -40C to 85C 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: |
| SP3243EEA-L/TR | 功能描述:RS-232接口集成电路 Intel. +3V to +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: |
| SP3243EET | 制造商:Exar Corporation 功能描述:Line Transceiver, 3-Driver, 5-Receiver, 28 Pin, Plastic, SOP |
| SP3243EET-L | 功能描述:RS-232接口集成电路 Intel. +3V to +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: |
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