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ADM3311EARU-REEL2.5 PDF预览

ADM3311EARU-REEL2.5

更新时间： 2024-09-11 23:27:55
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其他 - ETC 驱动器接口集成电路光电二极管
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12页 192K
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Transceiver

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ADM3311EARU-REEL2.5 数据手册

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15 kV ESD Protected, 2.7 V to 3.6 V  
™
a
Serial Port Transceiver with Green Idle  
ADM3311E*  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
Green Idle Power Saving Mode  
Full RS-232 Compliance  
C1  
0.1␮F  
Operates with 3 V Logic  
Low EMI  
Ultralow Power CMOS: 450 ␮A Operation  
Low Power Shutdown: 20 nA  
460 kbits/s Data Rate  
0.1 ␮F to 1 ␮F Charge Pump Capacitors  
Single 2.7 V to 3.6 V Power Supply  
One Receiver Active in Shutdown  
ESD >15 kV  
C4  
0.1␮F  
C3  
28  
27  
26  
25  
24  
23  
1
2
3
4
5
6
V+  
C3+  
0.1␮F  
0.1␮F  
GND  
C2+  
CERAMIC  
VOLTAGE  
TRIPLER/  
INVERTER  
+3V TO ؎9V  
V
V
C3–  
V–  
CC  
CC  
1␮F  
C5  
0.1␮F  
C2  
0.1␮F  
C2–  
EN  
ENABLE  
INPUT  
C1–  
SD  
SHUTDOWN  
INPUT  
C1+  
Pin Compatible with DS14C335  
22  
21  
20  
19  
18  
17  
16  
15  
7
8
9
T1  
IN  
T1  
T1  
OUT  
OUT  
OUT  
APPLICATIONS  
Laptop Computers  
Notebook Computers  
Printers  
Peripherals  
Modems  
EIA/TIA-232  
OUTPUTS  
CMOS  
T2  
T2  
T3  
T2  
IN  
INPUTS*  
T3  
T3  
IN  
10  
11  
12  
13  
14  
R1  
R1  
R2  
R3  
R4  
R1  
IN  
IN  
IN  
IN  
OUT  
OUT  
R2  
R2  
EIA/TIA-232  
INPUTS**  
CMOS  
OUTPUTS  
R3  
R3  
R4  
OUT  
R4  
OUT  
GENERAL DESCRIPTION  
The ADM3311E is a three driver/five receiver product designed  
to fully meet the EIA-232 standard while operating with a single  
2.7 V to 3.6 V power supply. The device features an on-board,  
charge pump, dc-to-dc converter, eliminating the need for dual  
power supplies. This dc-to-dc converter contains a voltage  
tripler and voltage inverter, which internally generates positive  
and negative supplies from the input 3 V power supply. The  
dc-to-dc converter operates in Green Idle Mode, whereby the  
charge pump oscillator is gated on and off to maintain the out-  
put voltage at 7.25 V under varying load conditions. This  
minimizes the power consumption and makes these products  
ideal for battery powered portable devices.  
R5  
R5  
R5  
OUT  
IN  
ADM3311E  
NOTES:  
INTERNAL 400k⍀ PULL-UP RESISTOR ON EACH CMOS INPUT  
INTERNAL 5k⍀ PULL-DOWN RESISTOR ON EACH RS-232 INPUT  
*
**  
A shutdown facility is also provided that reduces the power  
consumption to 3 µW. While in shutdown, one receiver remains  
active, thereby allowing monitoring of peripheral devices. This  
feature allows the device to be shut down until a peripheral device  
begins communication. The active receiver can alert the processor,  
which can then take the ADM3311E out of the shutdown mode.  
The ADM3311E is fabricated using CMOS technology for  
minimal power consumption. It features a high level of over-  
voltage protection and latch-up immunity.  
The ADM3311E is suitable for operation in harsh electrical  
environments and contains ESD protection up to 15 kV on  
all I-O lines.  
The ADM3311E is packaged in a 28-lead SSOP/TSSOP package.  
The ADM3311E contains three drivers and five receivers and is  
intended for serial port applications on notebook/laptop computers.  
*Protected by Patent No. 5,606,491.  
Green Idle is a trademark of Analog Devices, Inc.  
REV. B  
Information furnished by Analog Devices is believed to be accurate and  
reliable. However, no responsibility is assumed by Analog Devices for its  
use, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat  
may result from its use. No license is granted by implication or otherwise  
under any patent or patent rights of Analog Devices.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781/329-4700  
Fax: 781/326-8703  
www.analog.com  
© Analog Devices, Inc., 2001  
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