The MAX232 IC is used to convert the TTL/CMOS logic levels to RS232 logic levels during serial communication of microcontrollers with PC. The MAX232 is a dual driver/receiver and typically converts the RX, TX, CTS and RTS signals. The drivers provide RS-232 voltage level outputs (approx. ± 7.5 V) from a single + 5 V supply via on-chip charge pumps and external capacitors. This makes it useful for implementing RS-232 in devices that otherwise do not need any voltages outside the 0 V to + 5 V range, as power supply design does not need to be made more complicated just for driving the RS-232 in this case. The receivers reduce RS-232 inputs (which may be as high as ± 25 V), to standard 5 V TTL levels. These receivers have a typical threshold of 1.3 V, and a typical hysteresis of 0.5 V. The later MAX232A is backward compatible with the original MAX232 but may operate at higher baud rates and can use smaller external capacitors – 0.1 μF in place of the 1.0 μF capacitors used with the original device.
- Superior to bipolar
- 120kbits/sec Data Rate
- Low Power Shutdown Current
- Designed for RS232 and V.28 Applications
- Three state TTL/CMOS Receiver Outputs
- Battery-Powered Systems requiring UART communication with COM port of older PC.
- Connection of Modems to microcontrollers.
- DIY projects for connecting to a COM port of a computer and various other components such as GSM module etc.
1 x MAX232 - Dual Driver/Receiver IC