The M48T08/18/08Y TIMEKEEPER®RAM is an 8 K x 8 non-volatile static RAM and real-time clock which is pin and function compatible with the DS1643. The monolithic chip is available in two special packages to provide a highly integrated battery-backed memory and real-time clock solution.
The M48T08/18/08Y is a non-volatile pin and function equivalent to any JEDEC standard 8 K 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 M48T08/18/08Y 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” or “M4T32-BR12SH”.
|DS0494: 5 V, 64 Kbit (8 Kb x 8) TIMEKEEPER® SRAM||11.1||492.02 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|
|AN925: Time update in ST's TIMEKEEPER® devices||2.0||119.68 KB|
|AN968: VMEbus TIMEKEEPER® requirements||2.0||94.96 KB|
|Ibis model||1.0||15.62 KB|
|Ibis model||1.0||15.61 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|
|M48T18-100PC1||PDIP 28 .7||Tube||Active : Product is in volume production||1000||EAR99||MALAYSIA||MORE INFO||Buy Direct Add to cart||DISTRIBUTOR AVAILABILITY|
|M48T18-150PC1||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**|
|M48T18-100PC1||Active||PDIP 28 .7||Industrial||Ecopack1|
|M48T18-150PC1||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.