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M48T37V

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”.

pdf Download Datasheet

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 VM48T37V: 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 compliantLead-free second level interconnect

Circuit Diagram

Design Resources

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Technical Documentation

Product Specifications

Description Version Size
pdf
DS1898: 5.0 or 3.3 V, 256 Kbit (32 Kbit x 8) TIMEKEEPER® SRAM
9.0 508 KB

Application Notes

Description Version Size
pdf
AN1009: 'Negative undershoot' NVRAM data corruption
1.3 34 KB
pdf
AN1011: Battery technology used in NVRAM and real-time clock (RTC) products from ST
4.0 248 KB
pdf
AN1012: Predicting the battery life and data retention period of NVRAMs and serial RTCs
4.0 439 KB
pdf
AN1216: Implementing a periodic alarm with TIMEKEEPER®
1.5 54 KB
pdf
AN923: TIMEKEEPER® rolling into the next century
2.0 151 KB
pdf
AN925: Time update in ST's TIMEKEEPER® devices
2.0 120 KB
pdf
AN934: How to use the digital calibration feature in TIMEKEEPER® and serial real-time clock (RTC) products
4.1 123 KB
pdf
AN968: VMEbus TIMEKEEPER® requirements
2.0 95 KB

HW Model & CAD Libraries

HW Model & CAD Libraries

Description Version Size
zip
Ibis model
2.1 15 KB

Quality & Reliability

Product Certification

Description Version Size
pdf
Products Underwriter Laboratories (UL) Information
1.0 543 KB

Sample & Buy

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Part Number Marketing StatusPackagePacking TypeOperating Temperature (min) Operating Temperature (max) Automotive GradeOrder From STUnit Price (US$)*
@ 		Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
M48T37V-10MH1FActiveSO-44Tape And Reel070_Free samplesDistributor reported inventory date: 2013-05-21
Distributor NameRegionStockMin. order
ARROWOrder nowAMERICA2808936
AVNETOrder nowAMERICA9360
FUTUREOrder nowAMERICA936936
DIGIKEYOrder nowWORLDWIDE27611
Ecopack1-

(*) 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
(**) 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.

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