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BQ4015MA-70 Datasheet(PDF) 1 Page - Texas Instruments |
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BQ4015MA-70 Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 15 page  1 Features ➤ Data retention for at least 10 years without power ➤ Automatic write-protection during power-up/power-down cycles ➤ Conventional SRAM operation, including unlimited write cycles ➤ Internal isolation of battery be- fore power application ➤ Industry standard 32-pin DIP pinout ➤ 34-pin LIFETIME LITHIUM™ module - Module completely surface-mounted - Snap-on power-source for lithium battery backup - Replaceable power-source (part number: bq40MS) General Description The CMOS bq4015/Y is a nonvola- tile 4,194,304-bit static RAM organ- ized as 524,288 words by 8 bits. The integral control circuitry and lith- ium energy source provide reliable nonvolatility coupled with the un- limited write cycles of standard SRAM. The control circuitry constantly monitors the single 5V supply for an out-of-tolerance condition. When VCC falls out of tolerance, the SRAM is unconditionally write-protected to prevent an inadvertent write opera- tion. At this time the integral energy source is switched on to sustain the memory until after VCC returns valid. The bq4015/Y uses extremely low standby current CMOS SRAMs, cou- pled with small lithium coin cells to provide nonvolatility without long write-cycle times and the write-cycle limitations associated with EE- PROM. The bq4015/Y requires no external circuitry and is compatible with the industry-standard 4Mb SRAM pin- out. 1 PN401501.eps 32-Pin DIP Module 2 3 4 5 6 7 8 32 31 30 29 28 27 26 25 9 10 24 23 11 12 22 21 13 14 20 19 15 16 18 17 VCC A15 A17 WE A13 A8 A9 A11 OE A10 CE DQ7 DQ6 DQ5 DQ4 DQ3 A18 A16 A14 A12 A7 A6 A5 A4 A3 A2 A1 A0 DQ0 DQ1 DQ2 VSS Pin Names A0–A18 Address inputs DQ0–DQ7 Data input/output CE Chip enable input OE Output enable input WE Write enable input NC No connect VCC Supply voltage input VSS Ground bq4015/Y 5/99 E Pin Connections 512Kx8 Nonvolatile SRAM PN4015Yncm.eps 34-Pin LIFETIME LITHIUM Module 11 12 13 14 15 16 17 1 2 3 4 5 6 7 8 9 10 24 23 22 21 20 19 18 34 33 32 31 30 29 28 27 26 25 NC A15 A16 NC VCC WE OE CE DQ7 DQ6 DQ5 DQ4 DQ3 DQ2 DQ1 DQ0 VSS A18 A17 A14 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 Selection Guide Part Number Maximum Access Time (ns) Negative Supply Tolerance Part Number Maximum Access Time (ns) Negative Supply Tolerance bq4015x -70 70 -5% bq4015Yx -70 70 -10% bq4015x -85 85 -5% bq4015Yx -85 85 -10% Note: x = MA for PDIP or MS for LIFETIME LITHIUM module. |
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