Rainbow-electronics DS1243Y Bedienungsanleitung PDF herunterladen (Seite 8)

DS1243Y

8 of 13

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

Access Time

100 ns

Access Time

100 ns

to Output Low Z

COE

10 ns

to Output Low Z

OEE

10 ns

to Output High Z

40 ns 5

to Output High Z

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

Pulse Width

100 ns

RESET

Pulse Width

RST

200 ns

High to Power-Fail

0 ns

POWER-DOWN/POWER-UP TIMING

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

at V

before Power-Down

µs

Slew from 4.5V to 0V (

at V

)

300

µs

Slew from 0V to 4.5V (

at V

)

µs

at V

after Power-Up

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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