M48Z18 5V,64Kbit(8或× 8)计时器?的SRAM

The M48T08/18/08Y TIMEKEEPER? RAM is an 8K x 8 non-volatile static RAM and real time clock which is pin and functional compatible with the DS1643. The monolithic chip is available in two special packages to provide a highly integrated battery backed-up memory and real time clock solution.

The M48T08/18/08Y is a non-volatile pin and function equivalent to any JEDEC standard 8K 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, 600mil 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, 330mil 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” (see Table 17 on page 28).

M48Z18 产品特性:

• Integrated ultra low power sram, real time clock, power-fail control circuit, and battery
• BYTEWIDE? RAM-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 5.5V 4.5V ≤ VPFD ≤ 4.75V
  – M48T18/T08Y: VCC = 4.5 to 5.5V 4.2V ≤ VPFD ≤ 4.5V
• Software controlled clock calibration for high accuracy applications
• Self-contained battery and crystal in the CAPHAT? dip 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 8K x8 SRAMs
• RoHS compliant
  – Lead-free second level interconnect

M48Z18 技术支持与电子电路设计开发资源下载

1. M48Z18 数据手册DataSheet下载.PDF
2. 相关产品选型( Excel 文档格式)
3. 非易失性RAM产品选择指南 (PDF, 800Kb)
4. NVRAM选型指南
5. ST和竞争对手Atmel、Macronix、Holtek、Oki、Winbond的对照 (产品彩页, PDF)
6. RFID和射频内存产品 . PDF
7. 提升灵活性与world'sn ° 1 EEPROM的供应商. PDF
8. 意法半导体应用支持. PDF
9. 汽车级 半导体器件. PDF
10. 周围半导体 机顶盒应用. PDF