DS1643P-85+ - English Editing Encyclopedia Entry

Product Overview

Category

The DS1643P-85+ belongs to the category of integrated circuits (ICs).

Use

This product is primarily used for real-time clock (RTC) applications.

Characteristics

• The DS1643P-85+ is a non-volatile static RAM with an integrated RTC.
• It operates at a voltage range of 4.5V to 5.5V.
• The device has a low power consumption, making it suitable for battery-powered applications.
• It offers a high-speed access time and supports byte-wide data transfers.
• The DS1643P-85+ features a built-in lithium energy source for backup power.

Package

The DS1643P-85+ is available in a 28-pin plastic DIP (Dual Inline Package) format.

Essence

The essence of the DS1643P-85+ lies in its ability to combine non-volatile memory and real-time clock functionality in a single integrated circuit.

Packaging/Quantity

This product is typically packaged in tubes or trays, with quantities varying based on customer requirements.

Specifications

• Memory Size: 8K x 8 bits
• Access Time: 85ns
• Data Retention: Over 10 years
• Operating Temperature Range: -40°C to +85°C
• Clock Accuracy: ±2 minutes per month at 25°C

Detailed Pin Configuration

The DS1643P-85+ has a total of 28 pins, each serving a specific function. The pin configuration is as follows:

1. VCC - Power supply input
2. GND - Ground reference
3. CE - Chip enable
4. OE - Output enable
5. WE - Write enable
6. A0-A12 - Address inputs
7. DQ0-DQ7 - Data inputs/outputs
8. SQW/INT - Square wave output/interrupt output
9. RST - Reset input
10. X1 - Crystal oscillator input
11. X2 - Crystal oscillator output 12-28. NC - No connection

Functional Features

The DS1643P-85+ offers the following functional features:

• Non-volatile storage: The integrated non-volatile RAM allows data to be retained even when power is lost.
• Real-time clock: The built-in RTC provides accurate timekeeping functionality.
• Battery backup: The device includes a lithium energy source for backup power, ensuring data integrity during power interruptions.
• High-speed access: The DS1643P-85+ provides fast access times, enabling efficient data retrieval and storage.

Advantages and Disadvantages

Advantages

• Integration: Combining non-volatile memory and real-time clock functionality in a single chip simplifies circuit design and reduces component count.
• Low power consumption: The DS1643P-85+ operates at low power levels, making it suitable for battery-powered applications.
• Data retention: The non-volatile RAM ensures data integrity during power loss or system shutdowns.

Disadvantages

• Limited memory size: The DS1643P-85+ has a maximum memory capacity of 8K x 8 bits, which may not be sufficient for certain applications requiring larger storage.

Working Principles

The DS1643P-85+ utilizes a combination of static RAM and a real-time clock to provide its functionality. The static RAM stores data in a non-volatile manner, while the real-time clock keeps track of time. The integrated lithium energy source ensures that the data remains intact even during power interruptions.

Detailed Application Field Plans

The DS1643P-85+ finds applications in various fields, including but not limited to:

1. Embedded systems: The product can be used in embedded systems that require accurate timekeeping and non-volatile data storage.
2. Industrial automation: The DS1643P-85+ is suitable for applications where real-time clock functionality and reliable data retention are essential.
3. Automotive electronics: The integrated RTC and non-volatile RAM make this product useful in automotive applications such as dashboard displays and event logging systems.

Detailed and Complete Alternative Models

1. DS1644-120+: This model offers a larger memory size of 16K x 8 bits and operates at an access time of 120ns.
2. DS1646-100+: With a memory size of 32K x 8 bits, this alternative provides increased storage capacity and operates at an access time of 100ns.
3. DS1647-150+: This model combines a memory size of 64K x 8 bits with an access time of 150ns, catering to applications requiring higher memory capacity.

In conclusion, the DS1643P-85+ is an integrated circuit primarily used for real-time clock applications. Its combination of non-volatile RAM