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參數(shù)資料
| 型號： | SP3243EHEA-L/TR |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 4/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX RS232 INTELLIGENT 28SSOP |
| 標準包裝： | 1,500 |
| 類型： | 收發(fā)器 |
| 驅動器/接收器數(shù)： | 3/5 |
| 規(guī)程： | RS232 |
| 電源電壓： | 3 V ~ 5.5 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-SSOP（0.209"，5.30mm 寬） |
| 供應商設備封裝： | 28-SSOP |
| 包裝： | 帶卷 (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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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SP3243EHET | 功能描述:RS-232接口集成電路 Intelligent 3-5.5V RS-232 Transceiver RoHS:否 制造商:Exar 數(shù)據速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| SP3243EHET/TR | 功能描述:RS-232接口集成電路 Intelligent 3-5.5V RS-232 Transceiver RoHS:否 制造商:Exar 數(shù)據速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| SP3243EHET-L | 功能描述:RS-232接口集成電路 Intel. +3V to +5.5V RS-232 RoHS:否 制造商:Exar 數(shù)據速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| SP3243EHET-L/TR | 功能描述:RS-232接口集成電路 Intel. +3V to +5.5V RS-232 RoHS:否 制造商:Exar 數(shù)據速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| SP3243ET | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Intelligent +3.0V to +5.5V RS-232 Transceivers |
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