Rainbow-electronics DS1243Y Manual do Utilizador descarregar pdf (Página 7)

DS1243Y

7 of 13

MEMORY AC ELECTRICAL

CHARACTERISTICS (0°C to 70°C; V

= 5.0V ± 10%)

DS1243Y-120 DS1243Y-150 DS1243Y

PARAMETER SYMBOL MIN MAX MIN MAX MIN MAX UNITS NOTES

Read Cycle Time t

120 150 200 ns

Access Time t

ACC

120 150 200 ns

to Output Valid

60 70 100 ns

to Output Valid

120 150 200 ns

Output Active

COE

5 5 5 ns 5

Output High Z from

Deselection

40 70 100 ns 5

Output Hold from

Address Change

5 5 5 ns

Write Cycle Time t

120 150 200 ns

Write Pulse Width t

90 100 150 ns 3

Address Setup Time t

0 0 0 ns

Write Recovery

Time

20 20 20 ns

Output High Z from

ODW

40 70 80 ns 5

Output Active from

OEW

5 5 5 ns 5

Data Setup Time t

50 60 80 ns 4

Data Hold Time

from

20 20 20 ns 4

AC TEST CONDITIONS

Output Load: 50 pF + 1TTL Gate

Input Pulse Levels: 0–3V

Timing Measurement Reference Levels

Input: 1.5V

Output: 1.5V

Input Pulse Rise and Fall Times: 5 ns

1 2 3 4 5 6 7 8 9 10 11 12 13

PHANTOM CLOCK OPERATION 2
RAM READ MODE 2
RAM WRITE MODE 2
DATA RETENTION MODE 2
FRESHNESS SEAL 2
PHANTOM CLOCK 3
REGISTER INFORMATION 3
AM–PM/12/24 MODE 5
OSCILLATOR AND RESET BITS 5
ZERO BITS 5
= 5V ± 10%) 6
= 25°C) 6
MEMORY AC ELECTRICAL 7
= 5.0V ± 10%) 7
AC TEST CONDITIONS 7
= 4.5 to 5.5V) 8
MEMORY READ CYCLE (NOTE 1) 9
RESET FOR PHANTOM CLOCK 10
READ CYCLE TO PHANTOM CLOCK 10
WRITE CYCLE TO PHANTOM CLOCK 11
POWER-DOWN/POWER-UP CONDITION 11
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