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MAX232EIDWR bảng dữ liệu(PDF) 11 Page - Texas Instruments

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tên linh kiện MAX232EIDWR
Giải thích chi tiết về linh kiện  Dual RS-232 Driver and Receiver
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MAX232EIDWR bảng dữ liệu(HTML) 11 Page - Texas Instruments

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1 mF
1 mF
VS+
VS−
2
6
14
7
13
8
C1+
C1−
C2+
C2−
1
3
4
5
11
10
12
9
GND
15
0 V
VCC
16
5 V
RS-232 Output
RS-232 Output
RS-232 Input
RS-232 Input
1 mF
8.5 V
−8.5 V
1 mF
From CMOS or TTL
To CMOS or TTL
CBYPASS = 1 mF
C1
C2
C3
C4
C3 can be connected to VCC or GND.
+
+
Copyright © 2016, Texas Instruments Incorporated
11
MAX232E
www.ti.com
SLLS723C – APRIL 2006 – REVISED AUGUST 2016
Product Folder Links: MAX232E
Submit Documentation Feedback
Copyright © 2006–2016, Texas Instruments Incorporated
9 Applications and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
For proper operation add capacitors as shown in Figure 10. Pins 9 through 12 connect to UART or general
purpose logic lines. RS-232 lines on pins 7, 8, 13, and 14 connect to a connector or cable.
9.2 Typical Application
Resistor values shown are nominal.
Nonpolarized ceramic capacitors are acceptable. If polarized tantalum or electrolytic capacitors are used, they should
be connected as shown.
Figure 10. Typical Operating Circuit
9.2.1 Design Requirements
VCC minimum is 4.5 V and maximum is 5.5 V.
Maximum recommended bit rate is 250 kbit/s.
9.2.2 Detailed Design Procedure
The capacitor type used for C1–C4 is not critical for proper operation. The MAX232E requires 1-µF capacitors,
although capacitors up to 10 µF can be used without harm. Ceramic dielectrics are suggested for capacitors.
When using the minimum recommended capacitor values, make sure the capacitance value does not degrade
excessively as the operating temperature varies. If in doubt, use capacitors with a larger (for example, 2×)
nominal value. The capacitors' effective series resistance (ESR), which usually rises at low temperatures,
influences the amount of ripple on V+ and V–.


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