Rainbow-electronics DDS1693 Manual do Utilizador descarregar pdf (Página 25)

DS1689/DS1693

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DS1689/DS1693 BUS TIMING FOR READ CYCLE TO RTC

RTC AC TIMING CHARACTERISTICS

Over the operating range (5V)

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

Cycle Time t

CYC

305 DC ns

Pulse Width, RD / WR Low

PW

RWL

125 ns

Pulse Width, RD / WR High

PW

RWH

150 ns

Input Rise and Fall Time t

R

, t

F

30 ns

Chip Select Setup Time Before WR , or RD

t

CS

20 ns

Chip Select Hold Time t

CH

0ns

Read Data Hold Time t

DHR

10 80 ns

Write Data Hold Time t

DHW

0ns

Muxed Address Valid Time to ALE Fall t

ASL

30 ns

Muxed Address Hold Time from ALE Fall t

AHL

10 ns

RD or WR High Setup to ALE Rise

t

ASD

25 ns

Pulse Width ALE High PW

ASH

60 ns

ALE Low Setup to RD or WR Fall

t

ASED

40 ns

Output Data Delay Time from RD

t

DDR

20 120 ns 9

Data Setup Time t

DSW

100 ns

IRQ Release from RD

t

IRD

2

ms

CEI to CEO Delay

t

CED

10 ns

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