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AN654 Datasheet(PDF) 5 Page - Maxim Integrated Products |
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AN654 Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 8 page www.maxim-ic.com/an654 Page 5 of 8 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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