Product Summary

The DS1244Y is a fully static nonvolatile RAM (NV SRAM) (organized as 32k words by 8 bits) with a built-in real-time clock. The DS1244Y 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. The DS1244Y phantom clock provides timekeeping information for hundredths of seconds, seconds, minutes, hours, days, date, months, and years. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including correction for leap years. The phantom clock operates in either 24-hour or 12-hour format with an AM/PM indicator.

Parametrics

DS1244Y absolute maximum ratings: (1)Voltage Range on Any Pin Relative to Ground: -0.3V to +6.0V; (2)Storage Temperature Range: -40 to +85℃.

Features

DS1244Y features: (1)Real-Time Clock (RTC) Keeps Track of Hundredths of Seconds, Minutes, Hours, Days, Date of the Month, Months, and Years; (2)32k x 8 NV SRAM Directly Replaces Volatile Static RAM or EEPROM; (3)Embedded Lithium Energy Cell Maintains Calendar Operation and Retains RAM Data; (4)Watch Function is Transparent to RAM Operation; (5)Month and Year Determine the Number of Days in Each Month; Valid Up to 2100; (6)Full 10% Operating Range; (7)Operating Temperature Range: 0 to +70℃; (8)Over 10 Years of Data Retention in the Absence of Power; (9)Lithium Energy Source is Electrically Disconnected to Retain Freshness Until Power is Applied for the First Time; (10)DIP Module Only; (11)Standard 28-Pin JEDEC Pinout; (12)PowerCapR Module Board Only; (13)Available in Lead-Free Package.

Diagrams

DS1244Y block diagram

Image Part No Mfg Description Data Sheet Download Pricing
(USD)		 Quantity
DS1244Y-70
DS1244Y-70
Maxim Integrated Products
Real Time Clock
Data Sheet
Negotiable 
DS1244Y-70+
DS1244Y-70+
Maxim Integrated Products
Real Time Clock 256k NV SRAM w/Phantom Clock
Data Sheet
0-1: $14.58
1-25: $11.46
25-50: $11.40
50-100: $9.63
DS1244YP-70
DS1244YP-70

IC NVSRAM 256KBIT 70NS 34PCM
Data Sheet
Negotiable 
DS1244YP-70+
DS1244YP-70+
Maxim Integrated Products
Real Time Clock 256k NV SRAM w/Phantom Clock
Data Sheet
0-21: $16.04
21-25: $11.46
25-50: $11.40
50-100: $10.38
DS1244YP-100
DS1244YP-100
Other

Data Sheet
Negotiable 
DS1244Y
DS1244Y
Other

Data Sheet
Negotiable