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AN1012 Datasheet(PDF) 6 Page - STMicroelectronics |
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AN1012 Datasheet(HTML) 6 Page - STMicroelectronics |
6 / 33 page Process technology AN1012 6/33 Doc ID 6395 Rev 4 1 Process technology The ZEROPOWER®, TIMEKEEPER®, supervisor, and serial RTC families consist of a broad range of products that encompass various technologies. These products can be divided into six categories, as shown in Table 1. The SRAM array is generally based on a 6-transistor or 4-transistor cell, as indicated by the categories (6T and 4T). Figure 2 illustrates a one-bit storage cell from a 4-transistor SRAM cell. The hybrid devices (also known as module devices) contain individually packaged analog circuitry and SRAM. They are not covered in this document, except for the table of values for typical battery lifetimes in Appendix A: Product data on page 25. Table 1. ZEROPOWER and TIMEKEEPER® product categories Figure 2. Four-transistor (4T) SRAM cell The first devices, released in 1982, were based on a conventional 6T, full-CMOS, SRAM design. These were specified for low-voltage data retention, and were built to stringent manufacturing and test specifications. With data retention currents of less than 150 nA at 70 °C, these devices were designed to retain data in battery backup for at least 10 years over the full commercial temperature range. Newer devices have since been released. They use 4T, CMOS SRAM arrays. By using two poly-R resistors in place of the pull-up transistors of full-CMOS design, the 4T cell is much smaller than the 6T equivalent. Die size is dramatically reduced because the poly-R resistors can be stacked on top of n-channel pull-down MOSFETs in the cell. This leads to a net reduction in the device costs. Although the current drawn from the lithium cell is increased, the devices have been specified to outlast the useful life of most equipment in which they are used. Category Devices ZEROPOWER (4T cell) M48Z02, M48Z12, M48Z08, M48Z18, M48Z58/Y, M48Z35/Y/AV ZEROPOWER Hybrid M48Z128/Y, M48Z129V, M48Z512A/AY, M48Z2M1V/Y TIMEKEEPER (4T cell) M48T08/Y, M48T58/Y, M48T35/Y/AV, M48T37V/Y TIMEKEEPER Hybrid M48T128Y, M48T129V, M48T512Y Supervisors M40Z111/W, M40Z300W, M48T201V/Y Serial RTCs (6T cell) M41T00/S, M41T11, M41T56, M41T81/S, M41T94, M41ST85W, M41ST87W BIT-LINE BIT-LINE ROW SELECT GND SUPPLY VOLTAGE POLY-LOAD RESISTORS Q1 Q2 Q3 Q4 AI02457 |
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