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MAX232ECDWRE4 Scheda tecnica(PDF) 9 Page - Texas Instruments

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Il numero della parte MAX232ECDWRE4
Spiegazioni elettronici  Dual RS-232 Driver and Receiver
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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MAX232ECDWRE4 Scheda tecnica(HTML) 9 Page - Texas Instruments

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RX
TX
POWER
5 V
DIN
ROUT
DOUT
RS-232
RIN
RS-232
2
2
250 kb/s
IEC61000-4-2
2
2
Copyright © 2016, Texas Instruments Incorporated
9
MAX232E
www.ti.com
SLLS723C – APRIL 2006 – REVISED AUGUST 2016
Product Folder Links: MAX232E
Submit Documentation Feedback
Copyright © 2006–2016, Texas Instruments Incorporated
8 Detailed Description
8.1 Overview
The MAX232E device is a dual driver and receiver that includes a capacitive voltage generator using four
capacitors to supply TIA/EIA-232-F voltage levels from a single 5-V supply. All RS-232 pins have 15-kV HBM
and IEC61000-4-2 Air-Gap discharge protection. RS-232 pins also have 8-kV IEC61000-4-2 contact discharge
protection. Each receiver converts TIA/EIA-232-F inputs to 5-V TTL/CMOS levels. These receivers have shorted
and open fail safe. The receiver can accept up to ±30-V inputs and decode inputs as low as ±3 V. Each driver
converts TTL/CMOS input levels into TIA/EIA-232-F levels. Outputs are protected against shorts to ground.
8.2 Functional Block Diagram
Figure 8. Logic Diagram (Positive Logic)
8.3 Feature Description
8.3.1 Power
The power block increases and inverts the 5-V supply for the RS-232 driver using a charge pump that requires
four 1-µF external capacitors.
8.3.2 RS-232 Driver
Two drivers interface standard logic level to RS-232 levels. Internal pullup resistors on DIN inputs ensures a high
input when the line is high impedance.
8.3.3 RS-232 Receiver
Two receivers interface RS-232 levels to standard logic levels. An open or shorted to ground input results in a
high output on ROUT.


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