M48T58 采用5.0V,64Kbit(8Kbit × 8)计时器?SRAM
The M48T58/Y TIMEKEEPER? RAM is a 8Kb x 8 non-volatile static RAM and real time clock. The monolithic chip is available in two special packages to provide a highly integrated battery backed-up memory and real time clock solution.
The M48T58/Y is a non-volatile pin and function equivalent to any JEDEC standard 8Kb 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 M48T58/Y 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” (see Table 17 on page 29).
M48T58 产品特性:
- Integrated ultra-low power SRAM, real-time clock, power-fail control circuit, battery, and crystal
- BCD coded year, month, day, date, hours, minutes, and seconds
- Automatic power-fail chip deselect and write protection
- Write protect voltages:
(VPFD = Power-fail deselect voltage)
– M48T512Y: VCC = 4.5 to 5.5 V 4.2 V ≤ VPFD ≤ 4.5 V
– M48T512V: VCC = 3.0 to 3.6 V 2.7 V ≤ VPFD ≤ 3.0 V - Conventional SRAM operation; unlimited write cycles
- Software controlled clock calibration for high accuracy applications
- 10 years of data retention and clock operation in the absence of power
- Pin and function compatible with industry standard 512 K x 8 SRAMS
- Self-contained battery and crystal in DIP package
M48T58 技术支持与电子电路设计开发资源下载
- M48T58 数据手册DataSheet下载.PDF
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