Rainbow-electronics DS1244Y Manual de usuario descargar pdf (Pagina 12)

DS1244/DS1244P

12 of 19

POWER-DOWN/POWER-UP TIMING Over the operating range (3.3V)

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

CE at V

IH

before Power-Down

t

PD

0

ms

V

CC

Slew from V

PF(MAX)

to

V

PF(MIN)

( CE at V

IH

)

t

F

300

ms

V

CC

Slew from V

PF(MAX)

to

V

PF(MIN)

( CE at V

IH

)

t

R

0

ms

CE at V

IH

after Power-Up

t

REC

1.5 2.5 ms

(T

A

= +25°C)

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

Expected Data Retention Time t

DR

10 years 9

Warning: Under no circumstances are negative undershoots, of any amplitude, allowed when device is

in battery-backup mode.

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