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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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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

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
M48T12-150PC1
Active
PDIP 24 .7 Industrial Ecopack2 (**)
M48T12-70PC1
Active
PDIP 24 .7 Industrial Ecopack2 (**)

M48T12-150PC1

Package:

PDIP 24 .7

Material Declaration**:

PDF XML

Marketing Status

Active

Package

PDIP 24 .7

Grade

Industrial

RoHS Compliance Grade

Ecopack2 (**)

M48T12-70PC1

Package:

PDIP 24 .7

Material Declaration**:

PDF XML

Marketing Status

Active

Package

PDIP 24 .7

Grade

Industrial

RoHS Compliance Grade

Ecopack2 (**)

(**) 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.

Sample & Buy

Part Number
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Budgetary Price (US$)*/Qty
min
max
M48T12-70PC1 Available at 3 distributors

Distributor availability ofM48T12-70PC1

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 550 1 Order Now
RS COMPONENTS EUROPE 41 1 Order Now
ARROW EUROPE 140 0 Order Now

Distributor reported inventory date: 2020-08-10

Distributor Name

DIGIKEY

Stock

550

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

41

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

140

Min.Order

0

Region

EUROPE Order Now

Distributor reported inventory date: 2020-08-10

Active
EAR99 NEC Tube PDIP 24 .7 0 70 MALAYSIA
M48T12-150PC1 Available at 7 distributors

Distributor availability ofM48T12-150PC1

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 666 1 Order Now
RS COMPONENTS EUROPE 182 1 Order Now
FUTURE WORLDWIDE 476 14 Order Now
ARROW EUROPE 222 0 Order Now
Newark Element14 AMERICA 727 0 Order Now
MOUSER WORLDWIDE 307 1 Order Now
Farnell Element14 EUROPE 413 1 Order Now

Distributor reported inventory date: 2020-08-10

Distributor Name

DIGIKEY

Stock

666

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

182

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

476

Min.Order

14

Region

WORLDWIDE Order Now

ARROW

Stock

222

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

727

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

307

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

413

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-08-10

Buy now
Active
EAR99 NEC Tube PDIP 24 .7 0 70 MALAYSIA

M48T12-70PC1

Marketing Status

Active

ECCN (US)

EAR99

Distributor availability ofM48T12-70PC1

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 550 1 Order Now
RS COMPONENTS EUROPE 41 1 Order Now
ARROW EUROPE 140 0 Order Now

Distributor reported inventory date: 2020-08-10

Distributor Name

DIGIKEY

Stock

550

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

41

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

140

Min.Order

0

Region

EUROPE Order Now

Distributor reported inventory date: 2020-08-10

ECCN (EU)

NEC

Packing Type

Tube

Package

PDIP 24 .7

Operating Temperature (°C)

(min)

0

(max)

70

Country of Origin

MALAYSIA

M48T12-150PC1

Marketing Status

Active

ECCN (US)

EAR99

Distributor availability ofM48T12-150PC1

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 666 1 Order Now
RS COMPONENTS EUROPE 182 1 Order Now
FUTURE WORLDWIDE 476 14 Order Now
ARROW EUROPE 222 0 Order Now
Newark Element14 AMERICA 727 0 Order Now
MOUSER WORLDWIDE 307 1 Order Now
Farnell Element14 EUROPE 413 1 Order Now

Distributor reported inventory date: 2020-08-10

Distributor Name

DIGIKEY

Stock

666

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

182

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

476

Min.Order

14

Region

WORLDWIDE Order Now

ARROW

Stock

222

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

727

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

307

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

413

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-08-10

ECCN (EU)

NEC

Packing Type

Tube

Package

PDIP 24 .7

Operating Temperature (°C)

(min)

0

(max)

70

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