DS1244Y-70

有效庫存3,542

56k NV SRAM featuring a covert clock

  • 製造商零件號 # : DS1244Y-70

  • 包裝/封裝: EDIP-28

  • 製造商: Analog Devices

  • 產品分類 : Real Time Clocks

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DS1244Y-70 數據表

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詳細說明

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

主要特徵

  • 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

規格

以下是所選零件的基本參數,涉及零件的特性及其所屬類別。

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

數據表 PDF

數據表記錄了器件的特性、絕對最大額定值、應用等,這對於作為器件特定應用的整體指南大有裨益。

初步規格 DS1244Y-70 PDF 下載

常見問題解答

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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