The MC1489P, originally manufactured by National Semiconductor and now by Texas Instruments (TI), is a quad line receiver designed to interface data terminal equipment (DTE) with data communications equipment (DCE). It is specifically designed to meet the requirements of EIA Standard RS-232D.

Applications:

• RS-232 Interfaces
• Modems
• Computer Peripherals
• Data Acquisition Systems

Features:

• Four independent receivers in a single package
• Built-in input threshold hysteresis for noise immunity
• Input protection to ±30V
• Compatible with standard TTL logic levels
• Single 5V power supply operation
• Operates with single or split supplies

Benefits:

• Improved Noise Immunity: The built-in hysteresis improves noise margin and reduces false triggering caused by noisy environments.
• Simplified System Design: The TTL compatibility allows direct interfacing with common logic circuits.
• Robust Input Protection: Input protection up to ±30V safeguards the receiver from voltage surges and transients.
• Reduced Component Count: Integrating four receivers into a single package reduces board space and overall system cost.
• Easy Integration: Operates from a single +5V supply simplifying power supply design.

Additional Details:

The MC1489P converts single-ended RS-232 signals to TTL logic levels. It offers a high input impedance, minimizing loading on the transmission line. The hysteresis characteristic prevents oscillations due to slow-changing or noisy input signals. This device is typically used in applications where reliable data transmission is critical, such as serial communication interfaces, modems, and computer peripherals.

The device is available in a 14-pin PDIP (Plastic Dual In-Line Package). It is designed for operation in a temperature range of 0°C to +70°C.