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DS1244Y-70
56k NV SRAM featuring a covert clockDS1244Y-70
56k NV SRAM featuring a covert clock
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Manufacturer Part # : DS1244Y-70
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Package/Case: EDIP-28
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Brand: Analog Devices
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Product Categories : Real Time Clocks
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Service & Packaging
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DS1244Y-70 DataSheet
Current price plan is under preparation. Please contact our customer service team for the latest pricing information. Thank you for your understanding and support!
Details
The DS1244 256k NV SRAM with a Phantom clock is a fully static nonvolatile RAM (NV SRAM) (organized as 32k words by 8 bits) with a built-in real-time clock. The DS1244 has a self-contained lithium energy source and control circuitry, which constantly monitors VCC for an out-of-tolerance condition. When such a condition occurs, the lithium energy source is automatically switched on and write protection is unconditionally enabled to prevent garbled data in both the memory and real-time clock.FEATURES■ Real-time clock (RTC) keeps track of hundredths of seconds, minutes, hours, days, date of the month, months, and years■ 32k x 8 NV SRAM directly replaces volatile static RAM or EEPROM■ Embedded lithium energy cell maintains calendar operation and retains RAM data■ Watch function is transparent to RAM operation■ Month and year determine the number of days in each month; valid up to 2100■ Full 10% operating range■ Operating temperature range: 0C to +70C■ Over 10 years of data retention in the absence of power■ Lithium energy source is electrically disconnected to retain freshness until power is applied for the first time■ DIP module only■ Standard 28-pin JEDEC pinout■ PowerCap® module board only – Surface mountable package for direct connection to PowerCap containing battery and crystal – Replaceable battery (PowerCap) – Pin-for-pin compatible with DS1248P and DS1251P■ Underwriters Laboratory (UL) recognized
Key Features
- Real-time clock (RTC) keeps track of hundredths of seconds, minutes, hours, days, date of the month, months, and years
- 32k x 8 NV SRAM directly replaces volatile static RAM or EEPROM
- Embedded lithium energy cell maintains calendar operation and retains RAM data
- Watch function is transparent to RAM operation
- Month and year determine the number of days in each month; valid up to 2100
- Full 10% operating range
- Operating temperature range: 0C to +70C
- Over 10 years of data retention in the absence of power
- Lithium energy source is electrically disconnected to retain freshness until power is applied for the first time
- DIP module only
- Standard 28-pin JEDEC pinout
- PowerCap® module board only
- – Surface mountable package for direct connection to PowerCap containing battery and crystal
- – Replaceable battery (PowerCap)
- – Pin-for-pin compatible with DS1248P and DS1251P
- Underwriters Laboratory (UL) recognized
Specifications
The followings are basic parameters of the part selected concerning the characteristics of the part and categories it belongs to.
| Product Category ! | Real Time Clock | RoHS | N |
| Package / Case | EDIP-28 | RTC Bus Interface | Parallel, Phantom Clock |
| Date Format ! | YY-MM-DD-dd | Time Format ! | HH:MM:SS:hh |
| RTC Memory Size | 32 kB | Supply Voltage - Max | 5.5 V |
| Supply Voltage - Min | 4.5 V | Minimum Operating Temperature | 0 C |
| Maximum Operating Temperature ! | + 70 C | Brand | Analog Devices / Maxim Integrated |
| Product Type ! | Real Time Clocks | Series | DS1244Y |
| Subcategory | Clock & Timer ICs | Part # Aliases | DS1244Y |
Datasheet PDF
Datasheets record the features, absolute maximum ratings, applications and more of the device, which benefit a lot as an overall guide to the specific application of the part.
FAQs
What is DS1244Y-70?
The DS1244Y-70 is a non-volatile static RAM (NVSRAM) integrated circuit developed by Maxim Integrated. It combines the functionality of a static RAM with a non-volatile storage element, providing data retention even when power is removed. This makes it suitable for applications where critical data must be preserved during power interruptions, such as industrial automation, data logging, and embedded systems.
How Does DS1244Y-70 Work?
The DS1244Y-70 operates by utilizing a combination of volatile static RAM and non-volatile memory cells. When power is present, it functions as a regular static RAM, allowing read and write operations. During power loss, the non-volatile elements retain the data, ensuring that critical information is preserved for a specified period. When power is restored, the device can continue normal operation without data loss.
How Many Pins does DS1244Y-70 have and What are the Functions of the Pinout Configuration?
The DS1244Y-70 is housed in a 28-pin EDIP (Extended Plastic Dual-In-Line Package) package. The pinout configuration includes:
- VCC: Power supply pin.
- GND: Ground pin.
- CE1, CE2: Chip enable inputs for bank 1 and bank 2, respectively.
- OE: Output enable input.
- W: Write enable input.
- BS: Battery switch input for selecting between battery and external power.
- NC: No connect pin.
- A0-A14: Address input pins.
- DQ0-DQ7: Data input/output pins.
- NC: No connect pin.
- DS, RST: Data store and reset control pins for non-volatile elements.
- VBAT: Battery input for non-volatile data retention.
What are the Pros and Cons of DS1244Y-70?
Pros:
- Non-Volatile Data Storage: Preserves critical data during power interruptions, eliminating the need for external backup solutions.
- High Density: Offers a large storage capacity in a single chip, reducing the need for multiple components.
- Automatic Switchover: Seamlessly switches between battery and external power sources for continuous data retention.
- Industrial Grade: Suitable for harsh environments and industrial applications requiring reliable data storage.
Cons:
- Cost: NVSRAM devices may have a higher cost compared to traditional volatile RAM solutions.
- Complex Interfacing: Requires careful consideration of control signals and power management for proper operation.
Are There Any Equivalents/Alternatives to DS1244Y-70 for Recommendation?
- The CY14B101Q-SNXI from Cypress Semiconductor is a similar non-volatile static RAM offering.
- Alternatives to the DS1244Y-70 include the FM18W08-SG from Cypress Semiconductor and the M48Z02-150PC1 from STMicroelectronics.
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