The DS1488J is a Quad Line Driver manufactured by National Semiconductor, now a part of Texas Instruments (TI). This device is designed to convert TTL or CMOS logic levels to RS-232 voltage levels, enabling communication between digital systems and RS-232 serial interfaces. Its quad configuration allows for driving four separate RS-232 lines, making it suitable for applications requiring multiple serial communication channels.

Applications

• RS-232 serial communication
• Computer peripherals
• Modems
• Data acquisition systems
• Industrial control equipment

Features

• Quad line driver configuration
• TTL/CMOS compatible inputs
• RS-232 output voltage levels
• Short-circuit protection
• Slew-rate limited outputs

Benefits

• Simplified RS-232 interface design
• Direct interface with TTL/CMOS logic
• Protection against output short circuits
• Reduced EMI (Electromagnetic Interference) due to slew-rate limiting
• Multiple serial channels in a single package

Additional Details

The DS1488J requires both positive and negative power supplies to generate the RS-232 voltage levels. The slew-rate limited outputs help to reduce EMI, making it suitable for use in sensitive applications. The short-circuit protection feature prevents damage to the device in the event of an output short. The driver is designed to meet the RS-232 standard specifications for voltage levels and signal timing. It provides a reliable and robust interface between digital logic and RS-232 communication lines. This device is typically used in conjunction with an RS-232 receiver, such as the DS1489, to complete the serial communication link. The quad configuration allows for efficient use of board space and reduced component count in multi-channel RS-232 applications.