Rainbow-electronics DS1687 Manual do Utilizador descarregar pdf (Página 31)

DS1685/DS1687

31 of 38

RTC AC TIMING CHARACTERISTICS

= 5.0V±10%, 0°C to +70°C, -40°C to 85°C)

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

Cycle Time t

CYC

195 DC ns

Pulse Width, RD / WR Low

RWL

75 ns

Pulse Width, RD / WR High

RWH

75 ns

Input Rise and Fall Time t

, t

30 ns

Chip-Select Setup Time

Before WR , or RD

20 ns

Chip-Select Hold Time t

0ns

Read-Data Hold Time t

DHR

10 50 ns

Write-Data Hold Time t

DHW

0ns

Muxed Address Valid Time

to ALE Fall

ASL

30 ns

Muxed Address Hold Time

from ALE Fall

AHL

15 ns

RD or WR High Setup to

ALE Rise

ASD

25 ns

Pulse-Width ALE High PW

ASH

40 ns

ALE Low Setup to RD or

WR Fall

ASED

30 ns

Output-Data Delay Time

from

DDR

20 60 ns 7

Data Setup Time t

DSW

60 ns

IRQ Release from RD

IRD

AC TEST CONDITIONS

Output Load: 50pF

Input Pulse Levels: 0 to 3.0V

Timing Measurement Reference Levels

Input : 1.5V

Output: 1.5V

Input Pulse Rise and Fall Times: 5ns

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 37 38

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