5.0 V, 16 Kbit (2 Kb x 8) TIMEKEEPER® SRAM

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  • The M48T02/12 TIMEKEEPER®RAM is a 2 Kb x 8 non-volatile static RAM and real-time clock which is pin and functional compatible with the DS1642.

    A special 24-pin, 600 mil DIP CAPHATpackage houses the M48T02/12 silicon with a quartz crystal and a long life lithium button cell to form a highly integrated battery-backed memory and real-time clock solution.
    The M48T02/12 button cell has sufficient capacity and storage life to maintain data and clock functionality for an accumulated time period of at least 10 years in the absence of power over the operating temperature range.
    The M48T02/12 is a non-volatile pin and function equivalent to any JEDEC standard 2 Kb x 8 SRAM. It also easily fits into many ROM, EPROM, and EEPROM sockets, providing the non-volatility of PROMs without any requirement for special WRITE timing or limitations on the number of WRITEs that can be performed.

    Key Features

    • Integrated, ultra low power SRAM, real-time clock, and power-fail control circuit
    • BYTEWIDERAM-like clock access
    • BCD coded year, month, day, date, hours, minutes, and seconds
    • Typical clock accuracy of ±1 minute a month, at 25 °C
    • Software controlled clock calibration for high accuracy applications
    • Automatic power-fail chip deselect and WRITE protection
    • WRITE protect voltages (VPFD= power-fail deselect voltage):
      • M48T02: VCC= 4.75 to 5.5 V; 4.5 V ≤ VPFD≤ 4.75 V
      • M48T12: VCC= 4.5 to 5.5 V; 4.2 V ≤ VPFD≤ 4.5 V
    • Self-contained battery and crystal in the CAPHATDIP package
    • Pin and function compatible with JEDEC standard 2 K x 8 SRAMs
    • RoHS compliant
      • Lead-free second level interconnect

Circuit Diagram

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M48T12-70PC1 PDIP 24 .7 Tube
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M48T12-150PC1 PDIP 24 .7 Tube
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1000 EAR99 MALAYSIA Check Availability

Distributor availability ofM48T12-150PC1

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DIGIKEY WORLDWIDE 682 1 Order Now
RS COMPONENTS EUROPE 186 1 Order Now
FUTURE WORLDWIDE 868 14 Order Now
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MOUSER WORLDWIDE 288 1 Order Now

Distributor reported inventory date: 2019-05-21

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868

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288

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Distributor reported inventory date: 2019-05-21

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M48T12-70PC1

Package

PDIP 24 .7

Packing Type

Tube

Distributor availability ofM48T12-70PC1

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 310 1 Order Now
RS COMPONENTS EUROPE 165 1 Order Now
FUTURE WORLDWIDE 140 14 Order Now
ARROW EUROPE 112 0 Order Now
MOUSER WORLDWIDE 260 1 Order Now

Distributor reported inventory date: 2019-05-21

Distributor Name

DIGIKEY

Stock

310

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

165

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

140

Min.Order

14

Region

WORLDWIDE Order Now

ARROW

Stock

112

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

260

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-05-21

Marketing Status

Active

Quantity

1000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

M48T12-150PC1

Package

PDIP 24 .7

Packing Type

Tube

Distributor availability ofM48T12-150PC1

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 682 1 Order Now
RS COMPONENTS EUROPE 186 1 Order Now
FUTURE WORLDWIDE 868 14 Order Now
ARROW EUROPE 40 0 Order Now
Newark Element14 AMERICA 442 0 Order Now
MOUSER WORLDWIDE 288 1 Order Now

Distributor reported inventory date: 2019-05-21

Distributor Name

DIGIKEY

Stock

682

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

186

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

868

Min.Order

14

Region

WORLDWIDE Order Now

ARROW

Stock

40

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

442

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

288

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-05-21

Marketing Status

Active

Quantity

1000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DS0493
      5.0 V, 16 Kbit (2 Kb X 8) TIMEKEEPER® SRAM
      9.2
      374.13 KB
      PDF
      DS0493

      5.0 V, 16 Kbit (2 Kb X 8) TIMEKEEPER® SRAM

    • Description Version Size Action
      AN1011
      Battery technology used in NVRAM and real-time clock (RTC) products from ST
      4.0
      248.17 KB
      PDF
      AN934
      How to use the digital calibration feature in TIMEKEEPER® and serial real-time clock (RTC) products
      4.1
      123.42 KB
      PDF
      AN923
      Managing century information using serial real-time clocks and TIMEKEEPER® NVRAMs
      4.0
      142.23 KB
      PDF
      AN1009
      Negative undershoot NVRAM data corruption
      2.0
      82.05 KB
      PDF
      AN1012
      Predicting the battery life and data retention period of NVRAMs and serial RTCs
      4.1
      439.45 KB
      PDF
      AN925
      Time update in ST's TIMEKEEPER® devices
      2.0
      119.68 KB
      PDF
      AN1011

      Battery technology used in NVRAM and real-time clock (RTC) products from ST

      AN934

      How to use the digital calibration feature in TIMEKEEPER® and serial real-time clock (RTC) products

      AN923

      Managing century information using serial real-time clocks and TIMEKEEPER® NVRAMs

      AN1009

      Negative undershoot NVRAM data corruption

      AN1012

      Predicting the battery life and data retention period of NVRAMs and serial RTCs

      AN925

      Time update in ST's TIMEKEEPER® devices

Quality & Reliability

    • Description Version Size Action
      Products Underwriter Laboratories (UL) Information 2.1
      163 KB
      PDF

      Products Underwriter Laboratories (UL) Information

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
M48T12-150PC1
Active
PDIP 24 .7 Industrial Ecopack1
M48T12-70PC1
Active
PDIP 24 .7 Industrial Ecopack1

M48T12-150PC1

Package:

PDIP 24 .7

Material Declaration**:

PDF XML

Marketing Status

Active

Package

PDIP 24 .7

Grade

Industrial

RoHS Compliance Grade

Ecopack1

M48T12-70PC1

Package:

PDIP 24 .7

Material Declaration**:

PDF XML

Marketing Status

Active

Package

PDIP 24 .7

Grade

Industrial

RoHS Compliance Grade

Ecopack1

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.