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| 型号： | SP3243ECY-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 4/24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) |
12
Exar Corporation 48720 Kato Road, Fremont CA, 94538 510-668-7017 www.exar.com
SP3243E_102_060611
The first stage, shown in Figure 21, detects an
inactive input. A logic HIGH is asserted on
R
XINACT if the cable is disconnected or the
external transmitters are disabled. Otherwise,
R
XINACT will be at a logic LOW. This circuit is
duplicated for each of the other receivers.
ThesecondstageoftheAUTOON-LINEcircuitry,
shown in Figure 22, processes all the receiver's
R
XINACT signals with an accumulated delay that
disables the device to a 1A supply current.
The STATUS pin goes to a logic LOW when the
cable is disconnected, the external transmit-
ters are disabled, or the SHUTDOWN pin is
invoked.The typical accumulated delay is around
20s.
When the SP3243E drivers or internal charge
pump are disabled, the supply current is reduced
to 1A. This can commonly occur in hand-held
or portable applications where the RS-232 cable
is disconnected or the RS-232 drivers of the con-
nected peripheral are turned off.
The AUTO ON-LINE mode can be disabled by
the SHUTDOWN pin. If this pin is a logic LOW,
the AUTO ON-LINE function will not operate
regardless of the logic state of the ONLINE pin.
Table 3 summarizes the logic of the AUTO ON-
LINE operating modes. The truth table logic of
the SP3243E driver and receiver outputs can be
found in Table 2.
The STATUS pin outputs a logic LOW signal
if the device is shutdown. This pin goes to a
logic HIGH when the external transmitters are
enabled and the cable is connected.
When the SP3243E devices are shut down, the
charge pumps are turned off. V+ charge pump
output decays to V
CC, the V- output decays to
GND. The decay time will depend on the size
of capacitors used for the charge pump. Once
in shutdown, the time required to exit the shut
down state and have valid V+ and V- levels is
typically 200s.
For easy programming, the STATUS can be
used to indicate DSR or a Ring Indicator sig-
nal. Tying ONLINE and SHUTDOWN together
will bypass the AUTO ON-LINE circuitry so this
connection acts like a shutdown input pin.
Figure 14. AUTO ON-LINE Timing Waveforms
RECEIVER
RS-232 INPUT
VOLTAGES
STATUS
+5V
0V
-5V
tSTSL
tSTSH
tONLINE
VCC
0V
DRIVER
RS-232 OUTPUT
VOLTAGES
0V
+2.7V
-2.7V
S
H
U
T
D
O
W
N
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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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