Typically, the first driver/receiver pair of the MAX232 is used for TX and RX signals, and the second one for CTS and RTS signals. Texas Instruments makes compatible chips, using MAX232 as the part number. For more information, see RS-232 voltage levels. If the DTE really requires these signals, either a second MAX232 is needed, or some other IC from the MAX232 family can be used. The MAX232 is an integrated circuit first created in 1987 by Maxim Integrated Products that converts signals from a TIA-232 (RS-232) serial port to signals suitable for use in TTL-compatible digital logic circuits. The MAX232 is a dual driver/receiver and typically converts the RX, TX, CTS and RTS signals. The later MAX232A is forward compatible with the original MAX232 but may operate at higher baud rates and can use smaller external capacitors 0.1F in place of the 1.0F capacitors used with the original device. The newer MAX3232 is also backwards compatible, but operates at a broader voltage range, from 3 to 5.5V.. Versions. These receivers have a typical threshold of 1.3 volts and a typical hysteresis of 0.5 volts. The die of a MAX232 .
Voltage levels. TIA-232 line type and logic level TIA-232 voltage TTL voltage to/from MAX232 Data transmission (Rx/Tx) logic 0 +3V to +15V 0V Data transmission (Rx/Tx) logic 1 3V to 15V 5V Control signals (RTS/CTS/DTR/DSR) logic 0 3V to 15V 5V Control signals (RTS/CTS/DTR/DSR) logic 1 +3V to +15V 0V . Also, it is possible to connect DTR (DE-9 pin #4) directly to DSR (DE-9 pin #6) without going through any circuitry, which provides an automatic (brain-dead) DSR acknowledgment of the incoming DTR signal. The receivers reduce TIA-232 inputs, which may be as high as 25 volts, to standard 5-volt TTL levels. A MAX232 chip . Wikimedia Commons has media related to MAX232. TIA-232 to TTL converters that use MAX232 . When a MAX232 IC receives a TTL level to convert, it changes a TTL logic 0 to between +3 and +15V, and changes TTL logic 1 to between 3 and 15V, and vice versa for converting from TIA-232 to TTL. External links. This can be confusing when you realize that the TIA-232 data transmission voltages at a certain logic state are opposite from the TIA-232 control line voltages at the same logic state.
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