MAX2422EAI+T

The MAX2422EAI+T is a low-cost, single transceiver for RS-232/V.24EIA-232-F data communication applications. The MAX2422EAI+T uses a single dual charge-pump power supply operating at 3.3 V to fully support the RS-232 protocol. The MAX2422EAI+T is designed to meet the electrical specifications of V.24EIA-232-F with a minimum of external components.

The MAX2422EAI+T has an integrated transmitter and receiver jumpers, allowing the parts to operate in either a half-duplex or full-duplex configuration. In a half-duplex configuration, the transmit and receive data lines can be directly connected to the MAX2422EAI+T. In a full-duplex configuration, the transmit and receive data lines must be connected to a pair of differential line drivers to provide isolation from ground.The MAX2422EAI+T is an interface solution for applications that require a small physical size, low cost and minimal external components. It is suitable for applications such as Point-of-Sale (POS) devices, embedded systems, and other data communication applications.

Application Field

The MAX2422EAI+T is ideally suited for point-of-sale (POS) and other remote data entry applications. The MAX2422EAI+T is also a perfect solution for original equipment manufacturers (OEMs) that are designing data communications systems. The MAX2422EAI+T is a cost-effective transceiver that can be used in a wide range of applications from dataloggers to telemetry systems. Additionally, the MAX2422EAI+T is compatible with EIA-232-F protocols and can be used for various data communication applications in the automotive, industrial, medical, and consumer sectors.

Working Principle

The MAX2422EAI+T is designed to meet EIA-232-F specifications with a minimum of external components. The maximum data speed of the MAX2422EAI+T is baud rate of 115.2K bps. The integrated receiver and transmitter jumpers allow the MAX2422EAI+T to be used in either half-duplex or full-duplex configurations. A half-duplex configuration requires a single line driver and the MAX2422EAI+T is connected to the line driver on the transmit and receive lines. A full-duplex configuration requires two line drivers, one to drive the transmit line and the other to drive the receive line.

The MAX2422EAI+T incorporates a hysteretic comparator, a transconductance amplifier, and two current-controlled oscillators, to monitor and regulate the output current of the charge-pump power supply. This power source provides up to 12.5V to the pins, which meet the voltage specifications for the EIA-232-F standard. The MAX2422EAI+T also has an integrated thermal shutdown feature, which is activated when the temperature of the part exceeds a certain threshold.

The MAX2422EAI+T is designed with a precision ESD protection circuit to protect I/O pins and/or devices connected to it. This protection circuit uses matched pair diodes, resistors, and capacitors with the diodes operating near the forward voltage drop at the highest input currents to minimize ESD damage. A three-state enable input is also available on the MAX2422EAI+T. When the enable pin is used, the MAX2422EAI+T can be switched between receive and transmit modes, allowing both the transmitter and receiver to be active at the same time.

In summary, the MAX2422EAI+T is an inexpensive, low-power, single transceiver that can be used for a wide range of RS-232/V.24EIA-232-F applications. The MAX2422EAI+T makes use of an integrated receiver and transmitter jumpers to operate in either half-duplex or full-duplex configurations. Additionally, the MAX2422EAI+T incorporates precision ESD protection and thermal shutdown features, allowing use in critical interface applications.