Rainbow-electronics DS1644P Manual de usuario descargar pdf (Pagina 7)

DS1644/DS1644P

7 of 11

AC ELECTRICAL CHARACTERISTICS (Over the Operating Range)

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

Read Cycle Time t

120 ns

Address Access Time t

120 ns

CE Access Time

CEA

120 ns

CE Data Off Time

CEZ

40 ns

Output Enable Access Time t

OEA

100 ns

Output Enable Data Off Time t

OEZ

40 ns

Output Enable to DQ Low-Z t

OEL

5ns

CE to DQ Low-Z

CEL

5ns

Output Hold from Address t

5ns

Write Cycle Time t

120 ns

Address Setup Time t

0ns

CE Pulse Width

CEW

100 ns

Address Hold from End of Write t

AH1

AH2

Write Pulse Width t

WEW

75 ns

WE Data Off Time

WEZ

40 ns

WE or CE Inactive Time

10 ns

Data Setup Time t

85 ns

Data Hold Time High t

DH1

DH2

AC TEST CONDITIONS

Input Levels: 0V to 3V

Transition Times: 5 ns

CAPACITANCE (t

= 25°C)

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

Capacitance on all pins (except DQ) C

7pF

Capacitance on DQ pins C

10 pF

AC ELECTRICAL CHARACTERISTICS

(POWER-UP/DOWN TIMING) (Over the Operating Range)

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

CE or WE at V

before Power Down

µs

(Max) to V

(Min) V

Fall Time t

300

µs

(Min) to V

Fall Time t

µs

to V

(Min) V

Rise Time t

µs

(Min) to V

(Max) V

Rise Time t

µs

Power-Up t

REC

15 35 ms

Expected Data Retention Time

(Oscillator On)

10 years 4

1 2 3 4 5 6 7 8 9 10 11

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