MAX232D datasheet by Texas Instruments

MAX232D Frequently Asked Questions (FAQs)

• What is the maximum data rate that the MAX232D can support?
  The MAX232D can support data rates up to 120 kbps, but it's recommended to limit the data rate to 19.2 kbps for reliable operation.
• Can I use the MAX232D with a 3.3V supply voltage?
  Yes, the MAX232D can operate with a supply voltage as low as 2.7V, but the output voltage swing will be reduced. For 3.3V operation, the output voltage swing will be around 5V to 6V.
• How do I ensure that the MAX232D is properly terminated?
  The MAX232D requires a 1 kΩ to 10 kΩ pull-up resistor on the output pins (TOUT and RIN) to ensure proper termination. The value of the resistor depends on the specific application and the distance between the transmitter and receiver.
• What is the maximum cable length that the MAX232D can support?
  The maximum cable length that the MAX232D can support depends on the data rate and the quality of the cable. As a general rule, the MAX232D can support cable lengths up to 50 feet (15 meters) at 19.2 kbps, but this can be extended to 100 feet (30 meters) or more with the use of repeaters or line drivers.
• Can I use the MAX232D with a USB-to-RS232 adapter?
  Yes, the MAX232D is commonly used in USB-to-RS232 adapters, but it's essential to ensure that the adapter is designed to handle the specific requirements of the MAX232D, such as the output voltage swing and the termination resistors.