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M48T59VMH Datasheet(PDF) 3 Page - STMicroelectronics |
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M48T59VMH Datasheet(HTML) 3 Page - STMicroelectronics |
3 / 21 page 3/21 M48T59, M48T59Y, M48T59V DESCRIPTION The M48T59/59Y/59V TIMEKEEPER® RAM is an 8Kb x8 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 M48T59/59Y/59V is a non-volatile pin and function equivalent to any JEDEC standard 8Kb 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 600mil DIP CAPHAT™ houses the M48T59/59Y/59V 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 con- nection to a separate SNAPHAT housing contain- ing 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. Inser- tion of the SNAPHAT housing after reflow pre- vents potential battery and crystal damage due to the high temperatures required for device surface- mounting. The SNAPHAT housing is keyed to pre- vent reverse insertion. Table 4. AC Measurement Conditions Note that Output Hi-Z is defined as the point where data is no longer driven. Input Rise and Fall Times ≤ 5ns Input Pulse Voltages 0 to 3V Input and Output Timing Ref. Voltages 1.5V Figure 3. Block Diagram AI01383D LITHIUM CELL OSCILLATOR AND CLOCK CHAIN VPFD RST VCC VSS 32,768 Hz CRYSTAL VOLTAGE SENSE AND SWITCHING CIRCUITRY 16 x 8 BiPORT SRAM ARRAY 8176 x 8 SRAM ARRAY A0-A12 DQ0-DQ7 E W G POWER IRQ/FT Figure 4. AC Testing Load Circuit Note: Excluding open-drain output pins. AI02325 CL = 100pF CL includes JIG capacitance 645 Ω DEVICE UNDER TEST 1.75V |
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