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M48T59Y-70PC1E Datasheet(PDF) 5 Page - STMicroelectronics |
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M48T59Y-70PC1E Datasheet(HTML) 5 Page - STMicroelectronics |
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5 / 32 page  Obsolete Product(s) - Obsolete Product(s) Obsolete Product(s) - Obsolete Product(s) M48T59, M48T59Y, M48T59V Description 5/32 1 Description The M48T59/Y/V TIMEKEEPER® RAM is an 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-up memory and real-time clock solution. The M48T59/Y/V is a non-volatile pin and function equivalent to any JEDEC standard 8 Kb x8 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 M48T59/Y/V 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-BR12SH1” or “M4T32-BR12SHx” (see Table 19 on page 30). Caution: Do not place the SNAPHAT battery/crystal top in conductive foam, as this will drain the lithium button-cell battery. Figure 1. Logic diagram AI01380E 13 A0-A12 W DQ0-DQ7 VCC M48T59 M48T59Y M48T59V G VSS 8 E RST IRQ/FT |
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