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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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Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
M48T08-100PC1
Active
PDIP 28 .7 Industrial Ecopack2 (**)
M48T08-150PC1
Active
PDIP 28 .7 Industrial Ecopack2 (**)

M48T08-100PC1

Package:

PDIP 28 .7

Material Declaration**:

Marketing Status

Active

Package

PDIP 28 .7

Grade

Industrial

RoHS Compliance Grade

Ecopack2 (**)

M48T08-150PC1

Package:

PDIP 28 .7

Material Declaration**:

Marketing Status

Active

Package

PDIP 28 .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
Order from Distributors
Order from ST
Marketing Status
ECCN (US)
ECCN (EU)
Packing Type
Package
Temperature (°C) Country of Origin
Budgetary Price (US$)*/Qty
min
max
M48T08-100PC1 Available at 8 distributors

Distributor availability ofM48T08-100PC1

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 384 1 Order Now
RS COMPONENTS EUROPE 487 1 Order Now
AVNET AMERICA 170 0 Order Now
FUTURE WORLDWIDE 60 12 Order Now
ARROW EUROPE 89 0 Order Now
MOUSER WORLDWIDE 712 1 Order Now
Farnell Element14 EUROPE 364 1 Order Now
RUTRONIK EUROPE 192 12 Order Now

Distributor reported inventory date: 2020-09-25

Distributor Name

DIGIKEY

Stock

384

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

487

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

170

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

60

Min.Order

12

Region

WORLDWIDE Order Now

ARROW

Stock

89

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

712

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

364

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

192

Min.Order

12

Region

EUROPE Order Now

Distributor reported inventory date: 2020-09-25

Buy now
Active
EAR99 NEC Tube PDIP 28 .7 0 70 MALAYSIA 14.8515 / 1k
M48T08-150PC1 Available at 8 distributors

Distributor availability ofM48T08-150PC1

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 96 1 Order Now
COMPEL EUROPE 2 1 Order Now
RS COMPONENTS EUROPE 432 1 Order Now
FUTURE WORLDWIDE 24 12 Order Now
ARROW EUROPE 892 0 Order Now
MOUSER WORLDWIDE 383 1 Order Now
ANGLIA Live EUROPE 36 1 Order Now
RUTRONIK EUROPE 240 12 Order Now

Distributor reported inventory date: 2020-09-25

Distributor Name

DIGIKEY

Stock

96

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

2

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

432

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

24

Min.Order

12

Region

WORLDWIDE Order Now

ARROW

Stock

892

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

383

Min.Order

1

Region

WORLDWIDE Order Now

ANGLIA Live

Stock

36

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

240

Min.Order

12

Region

EUROPE Order Now

Distributor reported inventory date: 2020-09-25

Buy now
Active
EAR99 NEC Tube PDIP 28 .7 0 70 MALAYSIA 14.109 / 1k

M48T08-100PC1

Marketing Status

Active

ECCN (US)

EAR99

Distributor availability ofM48T08-100PC1

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 384 1 Order Now
RS COMPONENTS EUROPE 487 1 Order Now
AVNET AMERICA 170 0 Order Now
FUTURE WORLDWIDE 60 12 Order Now
ARROW EUROPE 89 0 Order Now
MOUSER WORLDWIDE 712 1 Order Now
Farnell Element14 EUROPE 364 1 Order Now
RUTRONIK EUROPE 192 12 Order Now

Distributor reported inventory date: 2020-09-25

Distributor Name

DIGIKEY

Stock

384

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

487

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

170

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

60

Min.Order

12

Region

WORLDWIDE Order Now

ARROW

Stock

89

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

712

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

364

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

192

Min.Order

12

Region

EUROPE Order Now

Distributor reported inventory date: 2020-09-25

ECCN (EU)

NEC

Packing Type

Tube

Package

PDIP 28 .7

Operating Temperature (°C)

(min)

0

(max)

70

Country of Origin

MALAYSIA

M48T08-150PC1

Marketing Status

Active

ECCN (US)

EAR99

Distributor availability ofM48T08-150PC1

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 96 1 Order Now
COMPEL EUROPE 2 1 Order Now
RS COMPONENTS EUROPE 432 1 Order Now
FUTURE WORLDWIDE 24 12 Order Now
ARROW EUROPE 892 0 Order Now
MOUSER WORLDWIDE 383 1 Order Now
ANGLIA Live EUROPE 36 1 Order Now
RUTRONIK EUROPE 240 12 Order Now

Distributor reported inventory date: 2020-09-25

Distributor Name

DIGIKEY

Stock

96

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

2

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

432

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

24

Min.Order

12

Region

WORLDWIDE Order Now

ARROW

Stock

892

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

383

Min.Order

1

Region

WORLDWIDE Order Now

ANGLIA Live

Stock

36

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

240

Min.Order

12

Region

EUROPE Order Now

Distributor reported inventory date: 2020-09-25

ECCN (EU)

NEC

Packing Type

Tube

Package

PDIP 28 .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