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DS1245W
POWER-DOWN/POWER-UP TIMING
(T A : See Note 10)
PARAMETER
V CC Fail Detect to CE and WE Inactive
V CC slew from V TP to 0V
SYMBOL
t PD
t F
MIN
150
TYP
MAX
1.5
15
UNITS
μ s
ms
NOTES
11
V CC slew from 0V to V TP
V CC Valid to CE and WE Inactive
V CC Valid to End of Write Protection
t R
t PU
t REC
150
2
125
μ s
ms
ms
(T A = +25 ° C)
PARAMETER
Expected Data Retention Time
SYMBOL
t DR
MIN
10
TYP
MAX
UNITS
years
NOTES
9
WARNING:
Under no circumstance are negative undershoots, of any amplitude, allowed when device is in battery
backup mode.
NOTES:
1. W E is high for a Read Cycle.
2. OE = V IH or V IL . If OE = V IH during write cycle, the output buffers remain in a high impedance state.
3. t WP is specified as the logical AND of CE and WE . t WP is measured from the latter of CE or WE
going low to the earlier of CE or WE going high.
4. t DH , t DS 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 V CC is first applied by
the user. The expected t DR is defined as accumulative time in the absence of V CC 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 V CC .
12. t WR1 and t DH1 are measured from W E going high.
13. t WR2 and t DH2 are measured from CE going high.
14. DS1245 modules are recognized by Underwriters Laboratories (UL) under file E99151.
8 of 10
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