Rainbow-electronics DS1244Y Manual de usuario descargar pdf (Pagina 10)

DS1244/DS1244P

10 of 19

PHANTOM CLOCK AC ELECTRICAL CHARACTERISTICS

Over the operating range (5V)

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

Read Cycle Time t

65 ns

CE Access Time

55 ns

OE Access Time

55 ns

CE to Output Low-Z

COE

5ns

OE to Output Low-Z

OEE

5ns

CE to Output High-Z

25 ns 5

OE to Output High-Z

ODO

25 ns 5

Read Recovery t

10 ns

Write Cycle Time t

65 ns

Write Pulse Width t

55 ns 3

Write Recovery t

10 ns 10

Data Setup Time t

30 ns 4

Data Hold Time t

0ns4

CE Pulse Width

60 ns

RESET Pulse Width

RST

65 ns

POWER-DOWN/POWER-UP TIMING Over the operating range (5V)

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

CE at V

before Power-Down

Slew from V

PF(max)

PF(min)

( CE at V

)

300

Slew from V

PF(min)

to V

Slew from V

PF(max)

PF(min)

( CE at V

)

CE at V

after Power-Up

REC

1.5 2.5 ms

= +25°C)

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

battery-backup mode.

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 18 19

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Rainbow-electronics DS1244Y Manual de usuario Pagina 10

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