Rainbow-electronics DS1248Y Manual de usuario descargar pdf (Pagina 7)

DS1248Y

032697 7/12

PHANTOM CLOCK AC ELECTRICAL CHARACTERISTICS (0°C to 70°C; V

= 4.5 to 5.5V)

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

Read Cycle Time t

120 ns

CE Access Time t

100 ns

OE Access Time t

100 ns

CE to Output Low Z t

COE

10 ns

OE to Output Low Z t

OEE

10 ns

CE to Output High Z t

40 ns 5

OE to Output High Z t

ODO

40 ns 5

Read Recovery t

20 ns

Write Cycle Time t

120 ns

Write Pulse Width t

100 ns

Write Recovery t

20 ns 10

Data Setup Time t

40 ns 11

Data Hold Time t

10 ns 11

CE Pulse Width t

100 ns

RESET Pulse Width t

RST

200 ns

CE High to Power–Fail t

0 ns

POWER-DOWN/POWER-UP TIMING

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

CE at V

before Power–Down t

0 µs

Slew from 4.5V to 0V

(CE

at V

)

300 µs

Slew from 0V to 4.5V

(CE

at V

)

0 µs

CE at V

after Power–Up t

REC

2 ms

= 25°C)

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

Expected Data Retention Time t

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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Rainbow-electronics DS1248Y Manual de usuario Pagina 7

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