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DS1244, DS1244P
256k NV SRAM with Phantom Clock
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Status
| Part Number |
Status |
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DS1244
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Active: In Production. See Ordering Information for details. |
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DS1244P
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Active: In Production. |
Description
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.
The 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.
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Data Sheet
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This product contains lithium-metal batteries. See applicable regulations for transport requirements for batteries in equipment.
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
- Automatic Leap Year Compensation Valid Up to 2100
- Full 10% Operating Range
- 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
- Available in Lead-Free Package
- Underwriters Laboratories (UL) Recognized
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Key Specifications:
| Timekeeping & Real-Time Clocks |
| Part Number |
Date/ Time Format |
Interface |
VSUPPLY
(V) |
Memory Type |
Memory Size
(Bytes) |
Time of Day Alarms |
Integrated XTAL |
Budgetary Price |
| hh = sec/100 |
See Notes |
| DS1244 |
YY-MM-DD/ HH:MM:SS:hh |
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NV SRAM |
32K |
0 |
No |
$13.76 @1k |
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See All Timekeeping & Real-Time Clocks (86)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
Typical Operating Circuit
Application Notes
Product Guides
Reliability Reports
Software/Models
Ordering Information
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Part Number
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Free
Sample |
Buy |
Status
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Recommended Replacement |
Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| DS1244W-120
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N/A |
No Longer Available |
DS1244W-120+
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EDIP;28 pin;629.9 mm²
Outline Drawing:21-0245 (PDF)
Land Pattern: Not Available
Use pkgcode/variation: MDT28-4*
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0°C to +70°C
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RoHS/Lead-Free: No
Materials Analysis |
| DS1244W-120+
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Active |
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EDIP;28 pin;629.9 mm²
Outline Drawing:21-0245 (PDF)
Land Pattern: Not Available
Use pkgcode/variation: MDT28+4*
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0°C to +70°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| DS1244W-120IND+
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Active |
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EDIP;28 pin;629.9 mm²
Outline Drawing:21-0245 (PDF)
Land Pattern: Not Available
Use pkgcode/variation: MDT28+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| DS1244WP-120
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N/A |
No Longer Available |
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PCAP;34 pin;596.9 mm²
Outline Drawing:21-0246 (PDF)
Land Pattern: Not Available
Use pkgcode/variation: PC2-4*
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0°C to +70°C
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RoHS/Lead-Free: No
Materials Analysis |
| DS1244WP-120+
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Active |
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PCAP;34 pin;596.9 mm²
Outline Drawing:21-0246 (PDF)
Land Pattern: Not Available
Use pkgcode/variation: PC2+4*
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0°C to +70°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| DS1244WP-120IND+
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Active |
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PCAP;34 pin;596.9 mm²
Outline Drawing:21-0246 (PDF)
Land Pattern: Not Available
Use pkgcode/variation: PC2+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| DS1244Y-70
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N/A |
No Longer Available |
DS1244Y-70+
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EDIP;28 pin;629.9 mm²
Outline Drawing:21-0245 (PDF)
Land Pattern: Not Available
Use pkgcode/variation: MDT28-4*
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0°C to +70°C
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RoHS/Lead-Free: No
Materials Analysis |
| DS1244Y-70+
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Active |
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EDIP;28 pin;629.9 mm²
Outline Drawing:21-0245 (PDF)
Land Pattern: Not Available
Use pkgcode/variation: MDT28+4*
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0°C to +70°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| DS1244YP-70+
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Active |
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PCAP;34 pin;596.9 mm²
Outline Drawing:21-0246 (PDF)
Land Pattern: Not Available
Use pkgcode/variation: PC2+4*
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0°C to +70°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
Notes:
- Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
- Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
- Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
- * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
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Information Index
Document Ref.: 19-6077
Rev 3;
2011-12-14
This page last modified: 2011-12-14
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