The M48T58/Y TIMEKEEPER®RAM is a 8 Kb 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 memory and real-time clock solution.
The M48T58/Y is a non-volatile pin and function equivalent to any JEDEC standard 8b Kb 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, 600 mil 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, 330 mil 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”.
|DS0495: 5.0 V, 64 Kbit (8 Kb X 8) TIMEKEEPER® SRAM||8.1||490.08 KB|
|AN1011: Battery technology used in NVRAM and real-time clock (RTC) products from ST||4.0||248.17 KB|
|AN934: How to use the digital calibration feature in TIMEKEEPER® and serial real-time clock (RTC) products||4.1||123.42 KB|
|AN923: Managing century information using serial real-time clocks and TIMEKEEPER® NVRAMs||4.0||142.23 KB|
|AN1009: Negative undershoot NVRAM data corruption||2.0||82.05 KB|
|AN1012: Predicting the battery life and data retention period of NVRAMs and serial RTCs||4.1||439.45 KB|
|AN1019: Second source for SNAPHAT® using a dual footprint||2.1||66.19 KB|
|AN925: Time update in ST's TIMEKEEPER® devices||2.0||119.68 KB|
|AN968: VMEbus TIMEKEEPER® requirements||2.0||94.96 KB|
|Products Underwriter Laboratories (UL) Information||2.1||543.21 KB|
|Products Underwriter Laboratories (UL) Information||2.1||163 KB|
|Part Number||Package||Packing Type||Marketing Status||Quantity||ECCN (US)||Country of Origin||More info||Order from ST||Order from Distributors|
|M48T58-70PC1||PDIP 28 .7||Tube||Active : Product is in volume production||1000||EAR99||MALAYSIA||MORE INFO||Buy Direct Add to cart||DISTRIBUTOR AVAILABILITY|
|Part Number||Marketing Status||Package||Grade||RoHS Compliance Grade||Material Declaration**|
|M48T58-70PC1||Active||PDIP 28 .7||Industrial||Ecopack1|
(**) 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.