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MAX232

Posted Date: 27 Apr 2008 Resource Type: Articles/Knowledge Sharing Category: Education

Posted By: C.Agnes Member Level: Silver
Rating:

Points: 5

MAX232:
Description:
The Max 232 is a dual driver/receiver that includes a capacitive voltage generator to supply TIA/EIA-232-F voltage levels from a single 5V supply. Each receiver converts TIA/EIA-232-F to 5V TTL/CMOS levels. These receivers have a typical threshold of 1.3V, a typical hysteresis of 0.5V and can accept ±30V inputs. Each driver converts TTL/CMOS to TIA/EIA-232-F levels. The 89C52 has a built in serial port that makes it very easy to communicate with the PC's serial port but the 89C52 outputs are 0 and 5 volts and we need +10 and -10 volts to meet the RS232 serial port standard. The easiest way to get these values is to use the MAX232. The MAX232 acts as a buffer driver for the processor. It accepts the standard digital logic values of 0 and 5 volts and converts them to the RS232 standard of +10 and -10 volts. It also helps protect the processor from possible damage from static that may come from people handling the serial port connectors. The MAX232 requires 5 external 1uF capacitors. These are used by the internal charge pump to create +10 volts and -10 volts. It includes 2 receivers and 2 transmitters so two serial ports can be used with a single chip.
Features:
? Meets or exceeds TIA/EIA-232-F and ITU recommendation V.28.
? Operates with a single 5V power supply with 1µF Charge pump capacitors.
? Operates up to 120 kbits/s.
? Two drivers and two receivers.
? ±30V input levels.
? Low supply current. Typically 8mA.
? ESD protection exceeds JESD 22 – 2000 V Human body model
? Upgrade with improved ESD (15-kV HBM) and 0.1µF Charge pump capacitors are available.

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