The MAX237CNG is a transceiver from Analog Devices / Maxim Integrated, designed for RS232 communication. It features a full duplex mode with 5/3 drivers and operates over a voltage range of 4.5V to 5.5V.
The MAX237ENG is a transceiver from Analog Devices / Maxim Integrated, designed for RS232 communication. It features 5/3 drivers and receivers and operates on a 4.5V to 5.5V supply.