DS1644

600 INR

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Product Details:

Power Source Battery or external DC
Components SRAM, Real-time Clock, Battery
Output Digital data (address/data bus)
Input Digital data (address/data bus)
Operating Temperature 0C to +70C
Usage Nonvolatile RAM for data retention and real-time clock applications
IP Rating Not rated
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Product Details
Product Description

DS1644 Price And Quantity

Minimum Order Quantity 10 Piece
Price 600 INR

DS1644 Product Specifications

Features Integrated RTC, battery backup, 10 years data retention, drop-in replacement
Response Time Access time: 100 ns
Application Industrial, embedded systems, computers, instrumentation
Weight Approx. 16 grams
Supply Voltage 4.5V to 5.5V
Power Supply Battery included (lithium) + External DC power
Capacity 32 Kbytes (256K-bit)
Size 28-pin DIP
Function Timekeeping and data storage (Timekeeper RAM)
Power Source Battery or external DC
Input Digital data (address/data bus)
Dimension (L*W*H) 36 mm x 18 mm x 16 mm
Current Rating 100mA (active), 1mA (standby)
Components SRAM, Real-time Clock, Battery
Output Digital data (address/data bus)
Frequency 32.768 kHz (crystal oscillator)
Operating Temperature 0C to +70C
Color Black
Usage Nonvolatile RAM for data retention and real-time clock applications
Thickness Approx. 0.6 inch
IP Rating Not rated
Interface Parallel (address/data bus)
Rated Voltage 5V DC
Product Type Timekeeping RAM module

Product Description

Specification

Base Part Number	DS1644
Features	Leap Year,NVSRAM
Type	Clock/Calendar
Mounting Type	Through Hole
Voltage Supply	4.5 V ~ 5.5 V
Time Format	HHMMSS (24 hr)
Supplier Device Package	28-EDIP
Part Status	Obsolete
Packaging	Tube
Package Case	28-DIP Module (0.600",15.24mm)
Operating Temperature	0 deg C ~ 70 deg C
Memory Size	32KB
Interface	Parallel
Date Format	YY-MM-DD-dd
Current Timekeeping Max	4mA @ 4.5V ~ 5.5V

Integrated Timekeeping and Data Storage Solution

DS1644 combines real-time clock functions with nonvolatile SRAM, streamlining the design process for systems requiring both precise timekeeping and reliable data retention. Its embedded battery ensures continuity, even during power disruptions, making it perfect for critical industrial and embedded applications.

Reliable Power and Longevity

The onboard lithium cell guarantees continuous operation for at least 10 years without external power, safeguarding stored data. With a rated supply voltage of 5V DC and current options for active and standby operation, DS1644 offers exceptional endurance and low-maintenance performance in demanding environments.

Simple Installation and Universal Compatibility

Featuring a through-hole 28-pin DIP footprint, the DS1644 is easily integrated into legacy and new PCB designs. The parallel bus interface allows seamless communication with common microprocessors, making it an excellent drop-in replacement for many systems requiring both real-time clock and SRAM functionalities.

FAQs of DS1644:

Q: How does the DS1644 maintain data retention during power loss?

A: The DS1644 is equipped with an embedded lithium cell that enables the device to preserve stored data and timekeeping functions for a minimum of 10 years, even when external DC power is unavailable. This makes it highly reliable for applications where data loss cannot be tolerated.

Q: What are the primary functions provided by the DS1644 module?

A: The DS1644 serves as both a nonvolatile SRAM (32 Kbytes) and a real-time clock, offering second-to-year timekeeping, leap year compensation, and calendar features. It combines data storage and timing in one compact solution suitable for various industrial and embedded applications.

Q: Where can DS1644 modules be used?

A: DS1644 modules are ideal for use in industrial control systems, embedded computers, instrumentation, and any application that requires nonvolatile memory with real-time clock functions. Despite being discontinued, they are still supported for replacement in legacy equipment throughout India by distributors and suppliers.

Q: When is it beneficial to use the DS1644 over separate SRAM and RTC components?

A: Choosing the DS1644 is beneficial when board space is limited, simplification of design is desired, and highly reliable backup protection is required. Its integrated RTC and SRAM, combined with battery backup, reduce component count and wiring complexity in critical systems.

Q: What is the maximum supply current of the DS1644 and its operational voltage range?

A: During active operation, the DS1644 draws up to 100 mA, while standby current is typically 1 mA. Its operational voltage range is from 4.5V to 5.5V DC, making it compatible with standard 5V logic systems.

Q: How is the DS1644 typically mounted in a system?

A: The device utilizes a through-hole design with a 28-pin plastic DIP package, allowing it to be securely mounted on printed circuit boards using standard DIP sockets or direct soldering for robust, reliable connections.

Q: What interface is required to communicate with the DS1644?

A: Communication with the DS1644 is achieved through a parallel interface using address and data buses (8-bit width). This supports fast data access with a typical access time of 100 ns, suitable for most legacy and embedded systems.

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