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NOT RECOMMENDED FOR NEW DESIGNS
POWER-DOWN/POWER-UP CONDITION
SEE NOTE 11
POWER-DOWN/POWER-UP TIMING
DS1225Y
PARAMETER
CE at V IH before Power-Down
SYMBOL
t PD
MIN
0
MAX
UNITS
μ s
NOTES
11
V CC Slew from V TP to 0V
V CC Slew from 0V to V TP
CE at V IH after Power-Up
t F
t R
t REC
100
0
2
μ s
μ s
ms
( T A = +25 ° C )
PARAMETER
Expected Data Retention Time
SYMBOL
t DR
MIN
10
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. WE is high for a read cycle.
2. OE = V IH or V IL . If OE = V IH during a 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 DS is 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 later than the WE low transition in Write
Cycle 1, 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 a high-impedance state during this period.
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