ST Life.augmented

M48T37V

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”.

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Errata Sheet
pdf データシート
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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

回路図

デザイン・リソース

トップ

Technical Documentation

Product Specifications

Description Version Size
pdf
DS1898: 5.0 or 3.3 V, 256 Kbit (32 Kbit x 8) TIMEKEEPER® SRAM
9.1 508 KB

Application Notes

Description Version Size
pdf
AN1009: Negative undershoot NVRAM data corruption
2.0 82 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
4.1 439 KB
pdf
AN1216: Implementing a periodic alarm with TIMEKEEPER® and serial real-time clocks (RTCs)
2.0 193 KB
pdf
AN923: Managing century information using serial real-time clocks and TIMEKEEPER® NVRAMs
3.0 195 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

サンプル& 購入

トップ
製品型名 Marketing StatusPackagePacking TypeOperating Temperature (min) Operating Temperature (max) Automotive GradeOrder From STUnit Price (US$)*
@ 1000
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
M48T37V-10MH1FActiveSO-44Tape And Reel070_-12.046Distributor reported inventory date: 2014-11-27
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA1872936
ARROWOrder NowEUROPE9360
DIGIKEYOrder NowWORLDWIDE10361
FUTUREOrder NowWORLDWIDE19091
Ecopack1PDF
XML

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(**)弊社ホームページで入手できるMaterial Declaration(材料宣誓書)のフォームは、各パッケージ・タイプで最も一般的に使用されるパッケージに基づいた包括的な文書です。そのため、特定のデバイスについて100%正確ではない可能性があります。特定のデバイスに関する情報については、 弊社セールスオフィス にお問合せ下さい。
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