DS1488N Quad Line Driver Technical Summary

Overview

The DS1488N is a quad line driver designed to convert standard TTL (Transistor-Transistor Logic) input logic levels into output levels that comply with EIA Standard RS-232D and CCITT Recommendation V.24. This component is widely used in serial communication interfaces, providing reliable signal transmission between devices operating at different voltage levels. The DS1488N features four independent drivers, making it suitable for multi-channel applications where signal integrity and voltage level translation are critical.

The device is engineered to deliver robust performance in industrial, commercial, and telecommunications environments. Its ability to handle current-limited outputs ensures protection against short circuits and excessive load conditions, enhancing system reliability. The DS1488N is a staple in legacy systems and modern designs requiring RS-232 compatibility.

Features

• Quad Line Driver: Four independent drivers in a single package, enabling multi-channel signal transmission.
• TTL to RS-232 Conversion: Converts TTL logic levels to RS-232D and V.24 compliant output levels.
• Current-Limited Outputs: Typical output current limitation of ±10 mA, protecting against short circuits and overloads.
• Wide Operating Voltage Range: Supports standard RS-232 voltage levels, ensuring compatibility with a variety of interfaces.
• High Noise Immunity: Designed to operate reliably in electrically noisy environments.
• Single-Stage Inversion: Simplifies signal conditioning with one stage of inversion for straightforward integration.
• Industrial Temperature Range: Suitable for use in harsh environments with extended temperature requirements.

Applications

The DS1488N is versatile and finds use in numerous applications where TTL to RS-232 level conversion is required. Below are some common use cases:

• Serial Communication Interfaces: Used in RS-232 ports for computers, terminals, and peripherals.
• Telecommunications Equipment: Facilitates signal level translation in modems, routers, and other networking devices.
• Industrial Control Systems: Provides reliable communication between microcontrollers and industrial machinery.
• Embedded Systems: Integrates into embedded designs requiring legacy serial communication support.
• Point-of-Sale (POS) Terminals: Enables connectivity between POS devices and host systems.
• Medical Devices: Used in equipment requiring robust serial data transmission.

Electrical Characteristics

The DS1488N exhibits the following key electrical specifications under typical operating conditions:

Absolute Maximum Ratings

• Supply Voltage (Vcc): +7V
• Output Voltage (Vout): ±25V
• Input Voltage (Vin): -0.5V to +7V
• Operating Temperature Range: 0°C to +70°C (commercial), -40°C to +85°C (industrial)
• Storage Temperature Range: -65°C to +150°C

Recommended Operating Conditions

• Supply Voltage (Vcc): +5V ±10%
• Input High Voltage (VIH): 2.0V min
• Input Low Voltage (VIL): 0.8V max
• Output Current (Iout): ±10 mA typical

Dynamic Characteristics

• Propagation Delay (tPLH, tPHL): 50 ns max
• Output Rise/Fall Time (tr, tf): 20 ns max

Package Information

The DS1488N is available in a standard 14-pin dual in-line package (DIP) and surface-mount (SOIC) options. Below are the detailed package specifications:

14-Pin DIP (Dual In-Line Package)

• Package Type: PDIP-14
• Dimensions: 19.3 mm x 6.35 mm (0.76 in x 0.25 in)
• Pin Pitch: 2.54 mm (0.1 in)
• Material: Molded plastic, lead-free options available

14-Pin SOIC (Small Outline Integrated Circuit)

• Package Type: SOIC-14
• Dimensions: 8.65 mm x 3.9 mm (0.34 in x 0.15 in)
• Pin Pitch: 1.27 mm (0.05 in)
• Material: Molded plastic, RoHS compliant

Pin Configuration

The pinout for the DS1488N is as follows:

• Pin 1: Output 1
• Pin 2: Input 1
• Pin 3: Output 2
• Pin 4: Input 2
• Pin 5: Output 3
• Pin 6: Input 3
• Pin 7: Output 4
• Pin 8: Input 4
• Pin 9: Ground (GND)
• Pin 10: Vcc (+5V supply)
• Pins 11-14: Not connected (NC)

Conclusion

The DS1488N quad line driver is a reliable and efficient solution for TTL to RS-232 level conversion. Its robust design, current-limited outputs, and compatibility with industry standards make it a preferred choice for serial communication applications. Whether used in industrial controls, telecommunications, or embedded systems, the DS1488N delivers consistent performance and durability. With multiple package options and a wide operating temperature range, it meets the demands of diverse applications while ensuring signal integrity and system protection.