M48T37Y:5.0 or 3.3 V, 256 Kbit (32 Kbit x 8) TIMEKEEPER® SRAM

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
产品规格
DescriptionVersionSize
DS1898: 5.0 or 3.3 V, 256 Kbit (32 Kbit x 8) TIMEKEEPER® SRAM9.1508 KB
应用手册
DescriptionVersionSize
AN1011: ST NVRAM 和实时时钟(RTC)产品中使用的电池技术4.0416 KB
AN934: How to use the digital calibration feature in TIMEKEEPER® and serial real-time clock (RTC) products4.1123 KB
AN1216: Implementing a periodic alarm with TIMEKEEPER® and serial real-time clocks (RTCs)2.0192 KB
AN923: Managing century information using serial real-time clocks and TIMEKEEPER® NVRAMs4.0142 KB
AN1009: Negative undershoot NVRAM data corruption2.082 KB
AN1012: 预测NVRAM 和串行RTC 的电池寿命和数据保存期限4.1813 KB
AN925: Time update in ST's TIMEKEEPER® devices2.0119 KB
AN968: VMEbus TIMEKEEPER® requirements2.094 KB
Product Certifications
DescriptionVersionSize
Products Underwriter Laboratories (UL) Information2.1543 KB
样片和购买
型号PackagePacking TypeQuantityECCN (EU)ECCN (US)Country of Origin
M48T37Y-70MH1FSO-44Tape And Reel1000NECEAR99MALAYSIA
质量和可靠性
型号PackageGradeRoHS Compliance GradeMaterial Declaration**
M48T37Y-70MH1FSO-44IndustrialEcopack1md_as-wspc-so44.350-wspc-batt-wspc-cu-wspc-wsocket_hzmh-wspc-l6aa37y-wspc-(m48t37y-70mh1f)-wspc-lock.pdf
md_as-wspc-so44.xml
5.0 or 3.3 V, 256 Kbit (32 Kbit x 8) TIMEKEEPER® SRAM M48T37Y
circuit_diagram_7019_thumbnail.png M48T37Y
ST NVRAM 和实时时钟(RTC)产品中使用的电池技术 M4Z28-BR00SH
How to use the digital calibration feature in TIMEKEEPER® and serial real-time clock (RTC) products M41T60
Implementing a periodic alarm with TIMEKEEPER® and serial real-time clocks (RTCs) M41T94
Managing century information using serial real-time clocks and TIMEKEEPER® NVRAMs M41T60
Negative undershoot NVRAM data corruption M48Z58Y
预测NVRAM 和串行RTC 的电池寿命和数据保存期限 M4Z28-BR00SH
Time update in ST's TIMEKEEPER® devices M48T37Y
VMEbus TIMEKEEPER® requirements M48T37Y
Predicting the battery life and data retention period of NVRAMs and serial RTCs M4Z28-BR00SH
md_as-wspc-so44.350-wspc-batt-wspc-cu-wspc-wsocket_hzmh-wspc-l6aa37y-wspc-(m48t37y-70mh1f)-wspc-lock.pdf M48T37Y
md_as-wspc-so44.xml M48T37Y