MAX244CQH-D

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The MAX244CQH-D is a family of advanced, high-speed, low power, bi-directional interface transceivers that are used to convert TTL and CMOS logic levels to and from EIA-232-compatible signals. By employing a unique auto-directionality feature, the MAX244CQH-D is capable of switching direction automatically. This feature eliminates the need for external direction control logic, making the device ideal for applications that require quick and reliable logic level conversion between TTL and EIA-232 signals. The MAX244CQH-D is manufactured using advanced CMOS technology, ensuring low power consumption and fast switching speeds. The device is available in 3.3V and 5V versions, making it suitable for use in portable and low-power applications. This paper will discuss the application field and working principle of the MAX244CQH-D interface transceiver.

Applications

The MAX244CQH-D is a versatile interface transceiver, suitable for various applications. It is commonly used in portable and low-power systems that require efficient data transfer between TTL/CMOS logic levels and EIA-232 lines. It can also be used as a data converter in data acquisition systems and as an interface between a computer and its peripherals. Additionally, the device is used in medical equipment, instrumentation, networking, audio/video equipment, and communications systems. In addition to the above mentioned applications, the MAX244CQH-D can also be used to boost the signal strength of EIA-232 signals, allowing them to travel further, without degradation.

Working Principle

The MAX244CQH-D is capable of bi-directional voltage translation between TTL and CMOS logic levels and EIA-232 line levels. It uses a unique auto-directionality feature that eliminates the need for external direction control logic, making it ideal for applications that require quick and reliable logic level conversion between TTL and EIA-232 signals. The device has two receiver inputs (one for each side of the interface) and two transmit outputs (again, one for each side of the interface). Both the receiver and transmitter inputs use a Schmitt-trigger input circuit to ensure clean switching between logic levels. Additionally, the device employs hysteresis to ensure noise immunity. The hysteresis prevents the device from falsely triggering due to noise, ensuring clean and reliable data transfer.

The device also features an on-board output buffer that can provide up to 16mA of drive current, which is sufficient to drive EIA-232 lines. The output buffer can be disabled by applying a voltage of 5V to the EN pin. The device also features an enable/disable input that can be used to disable the receiver inputs, and a receive enable pin that can be used to enable/disable the receiver inputs.

The MAX244CQH-D is available in two packages – the SSOP-20 and the TSSOP-20 packages. The device is available in 3.3V and 5V versions and can operate over a wide temperature range (from -40°C to +85°C). The device is RoHS compliant and has a maximum operating voltage of 5.5V.

Conclusion

The MAX244CQH-D is a versatile interface transceiver that is capable of bi-directional voltage conversion between TTL and EIA-232 levels. The device features an auto-directionality feature that eliminates the need for external direction control logic, making it ideal for quick and reliable logic-level conversion. Additionally, it features an output buffer and various control pins that can be used to control the receiver and transmitter inputs. The MAX244CQH-D is available in 3.3V and 5V versions and is suitable for use in portable and low-power applications.

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