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M40Z300 Datasheet(PDF) 8 Page - STMicroelectronics |
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M40Z300 Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 16 page M40Z300, M40Z300W 8/16 Table 7. Power Down/Up AC Characteristics (TA = 0 to 70°C) Note: 1. VPFD (max) to VPFD (min) fall time of less than tF may result in deselection/write protection not occurring until 200 µs after VCC passes VPFD (min).. 2. VPFD (min) to VSS fall time of less than tFB may cause corruption of RAM data. Symbol Parameter Min Max Unit tF (1) VPFD (max) to VPFD (min) VCC Fall Time 300 µs tFB (2) VPFD (min) to VSS VCC Fall Time 150 µs tR VPFD(min) to VPFD (max) VCC Rise Time 10 µs tEDL Chip Enable Propagation Delay Low M40Z300 12 ns M40Z300W 20 ns tEDH Chip Enable Propagation Delay High M40Z300 10 ns M40Z300W 20 ns tAS A, B set up to E 0ns tCER Chip Enable Recovery 40 120 ms tREC VPFD (max) to RST High 40 120 ms tWPT Write Protect Time M40Z300 40 150 µs M40Z300W 40 250 µs tRB VSS to VPFD (min) VCC Rise Time 1µs BATTERY LOW PIN The M40Z300/W automatically performs battery voltage monitoring upon power-up, and at factory- programmed time intervals of at least 24 hours. The Battery Low (BL) pin will be asserted if the battery voltage is found to be less than approxi- mately 2.5V. The BL pin will remain asserted until completion of battery replacement and subse- quent battery low monitoring tests, either during the next power-up sequence or the next scheduled 24-hour interval. If a battery low is generated during a power-up se- quence, this indicates that the battery is below 2.5V and may not be able to maintain data integrity in the SRAM. Data should be considered suspect, and verified as correct. A fresh battery should be installed. If a battery low indication is generated during the 24-hour interval check, this indicates that the bat- tery is near end of life. However, data is not com- promised due to the fact that a nominal VCC is supplied. In order to insure data integrity during subsequent periods of battery back-up mode, the battery should be replaced. SNAPHAT top should be replaced with valid VCC applied to the device. The M40Z300/W only monitors the battery when a nominal VCC is applied to the device. Thus appli- cations which require extensive durations in the battery back-up mode should be powered-up peri- odically (at least once every few months) in order for this technique to be beneficial. Additionally, if a battery low is indicated, data integrity should be verified upon power-up via a checksum or other technique. The BL pin is an open drain output and an appropriate pull-up resistor to VCC should be chosen to control the rise time. |
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