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AN654 Datasheet(PDF) 5 Page - Maxim Integrated Products

Part # AN654
Description  New RS-232 ICs Feature 1uA Supply Current, 15kV ESD Protection, and 3V Operation
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

AN654 Datasheet(HTML) 5 Page - Maxim Integrated Products

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Figure 2. The MAX3223 transceiver family combines ease of use (automatic shutdown) with the
+flexibility of override controls that force the IC into shutdown or normal operation.
DTE/DCE in One IC Eliminates Null Modem
Also useful for RS-232 transceivers is the capability for switching between two standard configurations:
DTE port and DCE port. The most common example is a dumb terminal or personal computer (DTE port)
connected to an external modem (DCE port). For this case, the connecting cable provides straight-through,
1-to-1 connections. Similarly, the serial cable for a printer is designed to plug into a DTE port at the
computer end.
But, problems arise if you must connect two computers together. Both are DTEs, so the standard DTE-to-
DCE cable won't work. The usual solution is a special LapLink™ cable, or a "null modem" that converts
one of the DTE ports to a DCE. A null modem is nothing more than two back-to-back connectors with
various wires transposed. The most common type of null modem is fully implemented by a single chip
(MAX214) whose internal circuitry (under the control of a single logic-level input) performs all the
necessary wiring transpositions.
Maxim Achieves Industry's Highest ESD Protection: ±15kV
Protection level complies with human body model and IEC 801-2 air-gap discharge method
ESD (electrostatic discharge) threatens an electronic system every time someone replaces a cable or
touches an I/O port. The discharges accompanying these routine events can render an I/O port useless by
destroying one or more interface ICs connected to the port. These failures can be expensive in terms of both
warranty repairs and perceived quality.


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