DS1489N
DS1489N Quad Line Receiver
Overview
The DS1489N and its variant, the DS1489A, are quad line receivers engineered to facilitate communication between data terminal equipment (DTE) and data communications equipment (DCE). Built on a single monolithic silicon chip, these devices comply with the stringent requirements of EIA Standard RS-232D, ensuring reliable performance in serial data communication applications. The DS1489N is particularly notable for its robustness, ease of integration, and ability to handle the voltage levels specified in RS-232D, making it a preferred choice for industrial and commercial communication systems.
Features
- Quad Receiver Configuration: Incorporates four independent line receivers in a single package, optimizing board space and reducing component count.
- RS-232D Compliance: Fully adheres to EIA Standard RS-232D, ensuring compatibility with a wide range of communication equipment.
- Wide Input Voltage Range: Capable of handling input voltages up to ±30V, providing resilience against voltage spikes and noise.
- High Noise Immunity: Designed to reject common-mode noise, enhancing signal integrity in electrically noisy environments.
- Low Power Consumption: Operates efficiently with minimal power requirements, making it suitable for battery-powered or energy-sensitive applications.
- TTL-Compatible Outputs: Outputs are compatible with TTL logic levels, simplifying interfacing with microcontrollers and digital logic circuits.
- Industrial Temperature Range: Available in variants that support extended temperature ranges, ensuring reliable operation in harsh environments.
Applications
The DS1489N is versatile and finds use in a variety of applications, including:
- Data Communication Systems: Used in modems, routers, and other networking equipment to interface between DTE and DCE.
- Industrial Automation: Facilitates reliable serial communication in PLCs, sensors, and control systems.
- Point-of-Sale (POS) Terminals: Enables connectivity between POS devices and peripherals such as printers and displays.
- Telecommunication Equipment: Integrates into legacy telecommunication systems requiring RS-232 compliance.
- Embedded Systems: Provides a straightforward solution for serial communication in microcontroller-based projects.
Electrical Characteristics
The DS1489N exhibits the following key electrical specifications under typical operating conditions (unless otherwise noted):
- Supply Voltage (Vcc): +5V ±10%
- Input Voltage Range: ±30V maximum
- Output Voltage (High): Minimum 2.4V (TTL-compatible)
- Output Voltage (Low): Maximum 0.4V (TTL-compatible)
- Propagation Delay: Typically 20ns (from input to output)
- Power Consumption: Typically 50mW per receiver (200mW total for quad configuration)
- Operating Temperature Range: 0°C to +70°C (commercial grade) or -40°C to +85°C (industrial grade)
Package Information
The DS1489N is available in a standard 14-pin dual in-line package (DIP) and surface-mount (SOIC) variants, providing flexibility for different assembly processes. The pinout configuration is as follows:
- Pin 1: Receiver 1 Output (Y1)
- Pin 2: Receiver 1 Input (A1)
- Pin 3: Receiver 2 Input (A2)
- Pin 4: Receiver 2 Output (Y2)
- Pin 5: Receiver 3 Output (Y3)
- Pin 6: Receiver 3 Input (A3)
- Pin 7: Receiver 4 Input (A4)
- Pin 8: Receiver 4 Output (Y4)
- Pin 9: Ground (GND)
- Pin 10: Not Connected (NC)
- Pin 11: Not Connected (NC)
- Pin 12: Not Connected (NC)
- Pin 13: Not Connected (NC)
- Pin 14: Supply Voltage (Vcc)
The package dimensions and recommended PCB footprint are provided in the manufacturer's datasheet, ensuring proper thermal and electrical performance during assembly.
Additional Notes
When designing with the DS1489N, it is advisable to include bypass capacitors near the Vcc pin to minimize power supply noise. Additionally, proper grounding techniques should be employed to maintain signal integrity, especially in high-speed or noisy environments. The DS1489A variant offers improved performance in certain parameters, such as lower propagation delay, and may be selected for applications requiring higher-speed operation.
