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DS1245W Datasheet(PDF) 7 Page - Dallas Semiconductor |
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DS1245W Datasheet(HTML) 7 Page - Dallas Semiconductor |
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7 / 11 page  DS1245W 7 of 11 POWER-DOWN/POWER-UP TIMING (tA: See Note 10) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES VCC Fail Detect to CE and WE Inactive tPD 1.5 µs 11 VCC slew from VTP to 0V tF 150 15 ms VCC slew from 0V to VTP tR 150 µs VCC Valid to CE and WE Inactive tPU 2ms VCC Valid to End of Write Protection tREC 125 ms (tA=25 °C) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Expected Data Retention Time tDR 10 years 9 WARNING: Under no circumstance are negative undershoots, of any amplitude, allowed when device is in battery backup mode. NOTES: 1. WE is high for a Read Cycle. 2. OE = VIH or VIL. If OE = VIH during write cycle, the output buffers remain in a high impedance state. 3. tWP is specified as the logical AND of CE and WE . tWP is measured from the latter of CE or WE going low to the earlier of CE or WE going high. 4. tDH, tDS are measured from the earlier of CE or WE going high. 5. These parameters are sampled with a 5 pF load and are not 100% tested. 6. If the CE low transition occurs simultaneously with or latter than the WE low transition, the output buffers remain in a high impedance state during this period. 7. If the CE high transition occurs prior to or simultaneously with the WE high transition, the output buffers remain in high impedance state during this period. 8. If WE is low or the WE low transition occurs prior to or simultaneously with the CE low transition, the output buffers remain in a high impedance state during this period. 9. Each DS1245W has a built-in switch that disconnects the lithium source until VCC is first applied by the user. The expected tDR is defined as accumulative time in the absence of VCC starting from the time power is first applied by the user. 10. All AC and DC electrical characteristics are valid over the full operating temperature range. For commercial products, this range is 0 °C to 70°C. For industrial products (IND), this range is -40°C to +85 °C. 11. In a power-down condition the voltage on any pin may not exceed the voltage on VCC. 12. tWR1 and tDH1 are measured from WE going high. 13. tWR2 and tDH2 are measured from CE going high. |
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