5.0 or 3.3 V, 256 Kbit (32 Kbit x 8) TIMEKEEPER® SRAM

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  • The M48T37Y/V TIMEKEEPER®RAM is a 32 Kb x 8 non-volatile static RAM and real-time clock. The monolithic chip is available in a special package which provides a highly integrated battery-backed memory and real-time clock solution.

    The 44-lead, 330 mil SOIC package 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/crystal 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 packages are shipped separately in plastic anti-static tubes or in tape & reel form. For the 44-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
    • Frequency test output for real-time clock software calibration
    • Automatic power-fail chip deselect and WRITE protection
    • Watchdog timer
    • WRITE protect voltage (VPFD= Power-fail deselect voltage):
      • M48T37Y: VCC= 4.5 to 5.5 V 4.2 V ≤ VPFD≤ 4.5 V
      • M48T37V: VCC= 3.0 to 3.6 V 2.7 V ≤ VPFD≤ 3.0 V
    • Packaging includes a 44-lead SOIC and SNAPHAT®top (to be ordered separately)
    • SOIC package provides direct connection for a SNAPHAT®top which contains the battery and crystal
    • Microprocessor power-on reset (valid even during battery backup mode)
    • Programmable alarm output active in the battery backup mode
    • Battery low flag
    • RoHS compliant
      • Lead-free second level interconnect

Circuit Diagram

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Part Number
Package
Packing Type
Marketing Status
Quantity
ECCN (US)
Country of Origin
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M48T37V-10MH1F SO-44 Tape And Reel
Active
10000 EAR99 MALAYSIA Check Availability

Distributor availability ofM48T37V-10MH1F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1489 1 Order Now
AVNET AMERICA 166 0 Order Now
FUTURE WORLDWIDE 936 936 Order Now
ARROW EUROPE 936 0 Order Now
MOUSER WORLDWIDE 906 1 Order Now

Distributor reported inventory date: 2019-07-12

Distributor Name

DIGIKEY

Stock

1489

Min.Order

1

Region

WORLDWIDE Order Now

AVNET

Stock

166

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

936

Min.Order

936

Region

WORLDWIDE Order Now

ARROW

Stock

936

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

906

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-07-12

Buy now

M48T37V-10MH1F

Package

SO-44

Packing Type

Tape And Reel

Distributor availability ofM48T37V-10MH1F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1489 1 Order Now
AVNET AMERICA 166 0 Order Now
FUTURE WORLDWIDE 936 936 Order Now
ARROW EUROPE 936 0 Order Now
MOUSER WORLDWIDE 906 1 Order Now

Distributor reported inventory date: 2019-07-12

Distributor Name

DIGIKEY

Stock

1489

Min.Order

1

Region

WORLDWIDE Order Now

AVNET

Stock

166

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

936

Min.Order

936

Region

WORLDWIDE Order Now

ARROW

Stock

936

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

906

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-07-12

Marketing Status

Active

Quantity

10000

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

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00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DS1898
      5.0 or 3.3 V, 256 Kbit (32 Kbit x 8) TIMEKEEPER® SRAM
      9.1
      508.02 KB
      PDF
      DS1898

      5.0 or 3.3 V, 256 Kbit (32 Kbit 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
      AN1216
      Implementing a periodic alarm with TIMEKEEPER® and serial real-time clocks (RTCs)
      2.0
      192.89 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
      AN968
      VMEbus TIMEKEEPER® requirements
      2.0
      94.96 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

      AN1216

      Implementing a periodic alarm with TIMEKEEPER® and serial real-time clocks (RTCs)

      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

      AN968

      VMEbus TIMEKEEPER® requirements

HW Model, CAD Libraries & SVD

    • Description Version Size Action
      Ibis model 1.0
      15 KB
      ZIP

      Ibis model

Quality & Reliability

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

      Products Underwriter Laboratories (UL) Information

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
M48T37V-10MH1F
Active
SO-44 Industrial Ecopack1

M48T37V-10MH1F

Package:

SO-44

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-44

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.