DS1221

100 INR

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Product Details:

Input Battery backup, external power
Interface Parallel
Output Time/date data, backup control signals
Power Supply Battery or external DC
Features Integrated power-fail detection, RTC, long-term data retention
Operating Temperature 0C to +70C
Usage Industrial and electronic equipment
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Product Details
Product Description

DS1221 Price And Quantity

Price 100 INR
Minimum Order Quantity 10 Piece

DS1221 Product Specifications

Capacity Controls up to 64k x 8 RAM
Thickness Approx. 7.6 mm
Charging Voltage 1.8V (battery powered / backup)
Product Type Nonvolatile Timekeeping RAM Controller IC
Power Source Battery or external power
Usage Industrial and electronic equipment
Features Integrated power-fail detection, RTC, long-term data retention
Supply Voltage 4.5V to 5.5V
Operating Temperature 0C to +70C
Components Monolithic IC with integrated crystal
Output Time/date data, backup control signals
Power Supply Battery or external DC
Color Black
Function Timekeeping with integrated RTC (Real Time Clock) and RAM control
Application RTC/NVRAM Control, data retention in electronics
Interface Parallel
Input Battery backup, external power
Size 18-pin DIP
Frequency 32.768 kHz crystal (internal)
Dimension (L*W*H) 24.13 mm x 7.62 mm x 7.6 mm (approx.)
Rated Voltage 5V DC
Weight Approx. 5 g
Current Rating Low-power operation, standby current < 1 A

Product Description

Specification

Base Part Number	DS1221
Voltage Supply	4.5 V ~ 5.5 V
Supplier Device Package	16-PDIP
Part Status	Obsolete
Packaging	Tube
Package Case	16-DIP (0.300", 7.62mm)
Operating Temperature	0 deg C ~ 70 deg C
Controller Type	Nonvolatile RAM

Accurate Timekeeping and Data Retention

The DS1221 ensures accurate time and date tracking with a typical accuracy of 2 minutes per month. Its integrated backup battery system retains RAM data for up to 10 years, making it indispensable for critical data storage in electronic and industrial environments. The internal crystal oscillator and compatibility with standard memory chips provide stability and versatility.

Versatile Mounting, Power, and Interface Options

Featuring an 18-pin Dual In-Line Package (DIP) and through-hole mounting style, the DS1221 integrates easily into existing PCB designs. It supports both battery backup and external 5V DC supply, with automatic power-fail detection to safeguard your data. The parallel interface and BCD time/date format ensure fast, reliable system integration.

FAQs of DS1221:

Q: How does the DS1221 provide long-term data retention?

A: The DS1221 uses an internal battery backup system that powers the integrated RAM control circuitry and lithium crystal oscillator, ensuring up to 10 years of data retention even when external power is lost.

Q: What are the main benefits of using the DS1221 over discrete RTC and RAM control solutions?

A: The DS1221 offers an all-in-one solution by combining real-time clock, power-fail detection, and RAM control in a single device. This simplifies circuit design, reduces component count, and enhances reliability while providing precision timekeeping and robust data retention.

Q: When should I use the DS1221 in my application?

A: The DS1221 is ideal for any application requiring secure data retention and accurate time/date stamping, especially in environments susceptible to power interruptions, such as industrial controllers, electronic instrumentation, and embedded systems.

Q: Where can the DS1221 be installed and by whom is it supplied in India?

A: The DS1221 is distributed, imported, and supplied by various authorized distributors, manufacturers, and wholesalers throughout India, making it widely available for your electronic or industrial project needs.

Q: What process is involved in mounting the DS1221 to a board?

A: The DS1221 features a through-hole DIP package, allowing for easy insertion into standard 18-pin DIP sockets or direct soldering onto printed circuit boards without complex surface-mount techniques.

Q: How does the power-fail detection feature work in the DS1221?

A: When the primary power supply voltage drops, the DS1221s integrated power-fail detection circuitry automatically switches to the backup battery, maintaining operation of its timekeeping and data retention functions without user intervention.

Q: What kind of devices is the DS1221 compatible with?

A: The DS1221 is designed to interface seamlessly with standard SRAM and NVRAM devices, controlling up to 64k x 8 RAM, and is well-suited for integration into a broad range of electronic equipment.

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