5 V, 64 Kbit (8 Kb x 8) TIMEKEEPER® SRAM

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  • The M48T08/18/08Y TIMEKEEPER®RAM is an 8 K x 8 non-volatile static RAM and real-time clock which is pin and function compatible with the DS1643. The monolithic chip is available in two special packages to provide a highly integrated battery-backed memory and real-time clock solution.

    The M48T08/18/08Y is a non-volatile pin and function equivalent to any JEDEC standard 8 K 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.
    The 28-pin, 600 mil DIP CAPHAT™ houses the M48T08/18/08Y silicon with a quartz crystal and a long-life lithium button cell in a single package.
    The 28-pin, 330 mil SOIC provides sockets with gold-plated contacts at both ends for direct connection to a separate SNAPHAT® housing containing the battery and crystal. The unique design allows the SNAPHAT®battery package to be mounted on top of the SOIC package after the completion of the surface mount process. Insertion of the SNAPHAT®housing after reflow prevents potential battery and crystal damage due to the high temperatures required for device surface-mounting. The SNAPHAT®housing is keyed to prevent reverse insertion.
    The SOIC and battery/crystal packages are shipped separately in plastic anti-static tubes or in tape & reel form. For the 28-lead SOIC, the battery/crystal package (e.g., SNAPHAT®) part number is “M4T28-BR12SH” or “M4T32-BR12SH”.

    Key Features

    Integrated ultra low power SRAM, real-time clock, power-fail control circuit, and battery


    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


    Automatic power-fail chip deselect and WRITE protection


    WRITE protect VPFD= power-fail deselect voltage):
    • M48T08: VCC= 4.75 to 5.5 V; 4.5 V ≤ VPFD≤ 4.75 V
    • M48T18/T08Y: VCC= 4.5 to 5.5 V; 4.2 V ≤ VPFD≤ 4.5 V
    Software controlled clock calibration for high accuracy applications


    Self-contained battery and crystal in the CAPHATDIP package


    Packaging includes a 28-lead SOIC and SNAPHAT® top (to be ordered separately)


    SOIC package provides direct connection for a snaphat top which contains the battery and crystal


    Pin and function compatible with DS1643 and JEDEC standard 8 K x 8 SRAMs


    RoHS compliant
    • Lead-free second level interconnect

Circuit Diagram

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M48T08-100PC1 PDIP 28 .7 Tube
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1000 EAR99 MALAYSIA Check Availability

Distributor availability ofM48T08-100PC1

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DIGIKEY WORLDWIDE 517 1 Order Now
RS COMPONENTS EUROPE 892 1 Order Now
AVNET AMERICA 129 0 Order Now
FUTURE WORLDWIDE 24 12 Order Now
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Newark Element14 AMERICA 32 0 Order Now
MOUSER WORLDWIDE 612 1 Order Now
Farnell Element14 EUROPE 267 1 Order Now
RUTRONIK EUROPE 36 12 Order Now

Distributor reported inventory date: 2019-03-25

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892

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129

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24

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9

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Newark Element14

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32

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612

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267

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36

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12

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Distributor reported inventory date: 2019-03-25

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M48T08-150PC1 PDIP 28 .7 Tube
Active
1000 EAR99 MALAYSIA Check Availability

Distributor availability ofM48T08-150PC1

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 694 1 Order Now
RS COMPONENTS EUROPE 2736 1 Order Now
AVNET AMERICA 13 0 Order Now
FUTURE WORLDWIDE 348 12 Order Now
ARROW EUROPE 2070 0 Order Now
ARROW AMERICA 223 240 Order Now
MOUSER WORLDWIDE 666 1 Order Now

Distributor reported inventory date: 2019-03-25

Distributor Name

DIGIKEY

Stock

694

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2736

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

13

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

348

Min.Order

12

Region

WORLDWIDE Order Now

ARROW

Stock

2070

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

223

Min.Order

240

Region

AMERICA Order Now

MOUSER

Stock

666

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-03-25

Buy direct

M48T08-100PC1

Package

PDIP 28 .7

Packing Type

Tube

Distributor availability ofM48T08-100PC1

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 517 1 Order Now
RS COMPONENTS EUROPE 892 1 Order Now
AVNET AMERICA 129 0 Order Now
FUTURE WORLDWIDE 24 12 Order Now
ARROW EUROPE 9 0 Order Now
Newark Element14 AMERICA 32 0 Order Now
MOUSER WORLDWIDE 612 1 Order Now
Farnell Element14 EUROPE 267 1 Order Now
RUTRONIK EUROPE 36 12 Order Now

Distributor reported inventory date: 2019-03-25

Distributor Name

DIGIKEY

Stock

517

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

892

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

129

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

24

Min.Order

12

Region

WORLDWIDE Order Now

ARROW

Stock

9

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

32

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

612

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

267

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

36

Min.Order

12

Region

EUROPE Order Now

Distributor reported inventory date: 2019-03-25

Marketing Status

Active

Quantity

1000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

M48T08-150PC1

Package

PDIP 28 .7

Packing Type

Tube

Distributor availability ofM48T08-150PC1

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 694 1 Order Now
RS COMPONENTS EUROPE 2736 1 Order Now
AVNET AMERICA 13 0 Order Now
FUTURE WORLDWIDE 348 12 Order Now
ARROW EUROPE 2070 0 Order Now
ARROW AMERICA 223 240 Order Now
MOUSER WORLDWIDE 666 1 Order Now

Distributor reported inventory date: 2019-03-25

Distributor Name

DIGIKEY

Stock

694

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2736

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

13

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

348

Min.Order

12

Region

WORLDWIDE Order Now

ARROW

Stock

2070

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

223

Min.Order

240

Region

AMERICA Order Now

MOUSER

Stock

666

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-03-25

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

Technical Documentation

    • Description Version Size Action
      DS0494
      5 V, 64 Kbit (8 Kb x 8) TIMEKEEPER® SRAM
      11.1
      492.02 KB
      PDF
      DS0494

      5 V, 64 Kbit (8 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
      543.21 KB
      PDF
      Products Underwriter Laboratories (UL) Information 2.1
      163 KB
      PDF

      Products Underwriter Laboratories (UL) Information

      Products Underwriter Laboratories (UL) Information

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
M48T08-100PC1
Active
PDIP 28 .7 Industrial Ecopack1
M48T08-150PC1
Active
PDIP 28 .7 Industrial Ecopack1

M48T08-100PC1

Package:

PDIP 28 .7

Material Declaration**:

Marketing Status

Active

Package

PDIP 28 .7

Grade

Industrial

RoHS Compliance Grade

Ecopack1

M48T08-150PC1

Package:

PDIP 28 .7

Material Declaration**:

Marketing Status

Active

Package

PDIP 28 .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.