DS1220AB/AD

7 of 9

POWER-DOWN/POWER-UP CONDITION

SEE NOTE 11

POWER-DOWN/POWER-UP TIMING

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

NOTES

0

µs

11

300

µs

300

µs

2

125

ms

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

NOTES

Expected Data Retention Time

10

years

9

WARNING:

Under no circumstances are negative undershoots, of any amplitude, allowed when device is in the

battery backup mode.

NOTES:

1.

WE is high for a read cycle.

going low to 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, the output

buffers remain in a high-impedance state during this period.