DS1747P-70IND+ - English Editing Encyclopedia Entry

Product Overview

Category: Integrated Circuits (ICs)
Use: Real-Time Clock (RTC) with Non-Volatile RAM (NVRAM)
Characteristics: Low-power, high-performance, non-volatile memory
Package: 24-Pin PDIP (Plastic Dual In-Line Package)
Essence: Combines real-time clock and non-volatile RAM in a single chip
Packaging/Quantity: Individually packaged, quantity per package varies

Specifications

• Supply Voltage: 4.5V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Clock Frequency: 32.768kHz
• Memory Size: 4K x 8 bits
• Data Retention: Over 10 years
• Write Endurance: 10^6 cycles
• I/O Type: Parallel

Pin Configuration

The DS1747P-70IND+ has a total of 24 pins. The pin configuration is as follows:

1. VCC - Power supply voltage
2. GND - Ground
3. X1 - Crystal oscillator input
4. X2 - Crystal oscillator output
5. NC - No connection
6. CE - Chip enable
7. OE - Output enable
8. WE - Write enable
9. A0-A10 - Address inputs
10. DQ0-DQ7 - Data inputs/outputs
11. RST - Reset
12. VBAT - Battery backup voltage 13-24. NC - No connection

Functional Features

• Real-time clock with calendar functionality
• Non-volatile RAM for data storage
• Automatic power-fail detection and switch circuitry
• Battery backup support for data retention during power loss
• Software-controlled clock calibration
• Alarm and interrupt functions

Advantages

• Integration of real-time clock and non-volatile RAM reduces component count and board space requirements
• Low power consumption extends battery life in portable devices
• High-performance operation ensures accurate timekeeping and reliable data storage
• Automatic power-fail detection prevents data loss during power interruptions

Disadvantages

• Limited memory size may not be sufficient for certain applications requiring larger data storage
• Parallel I/O interface may not be compatible with all systems or require additional level shifting circuitry

Working Principles

The DS1747P-70IND+ combines a real-time clock and non-volatile RAM on a single chip. The real-time clock keeps track of time, date, and day of the week using an internal oscillator and a crystal connected to X1 and X2 pins. The non-volatile RAM provides storage for critical data that needs to be retained even when power is lost. The chip automatically detects power failures and switches to battery backup mode to ensure data integrity.

Application Field Plans

The DS1747P-70IND+ is commonly used in various applications such as: - Embedded systems - Industrial automation - Medical equipment - Automotive electronics - Consumer electronics

Alternative Models

• DS1746P-70IND+: Similar to DS1747P-70IND+ but without battery backup support
• DS1744P-70IND+: Real-time clock with non-volatile SRAM instead of NVRAM
• DS1742W-120IND+: Real-time clock with battery-backed SRAM

Note: This is not an exhaustive list of alternative models. Please refer to the manufacturer's documentation for a complete list.

In conclusion, the DS1747P-70IND+ is a versatile integrated circuit that combines a real-time clock and non-volatile RAM in a single package. Its low-power, high-performance characteristics make it suitable for a wide range of applications. However, its limited memory size and parallel I/O interface may pose limitations in certain scenarios.