Rainbow-electronics DS17287 Manual de usuario descargar pdf (Pagina 27)

DS17285/DS17287

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RTC AC TIMING CHARACTERISTICS Over the operating range (3V)

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

Cycle Time t

CYC

360 DC ns

Pulse-Width, RD / WR Low

PW

RWL

200 ns

Pulse-Width, RD / WR High

PW

RWH

150 ns

Input Rise and Fall 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 90 ns

Write Data Hold Time t

DHW

0ns

Muxed Address Valid Time to

ALE Fall

t

ASL

40 ns

Muxed Address Hold Time to

ALE Fall

t

AHL

10 ns

RD or WR High Setup to

ALE Rise

t

ASD

30 ns

Pulse-Width ALE High PW

ASH

40 ns

ALE Low Setup to RD or WR

Fall

t

ASED

30 ns

Output Data-Delay Time from

RD

t

DDR

20 200 ns 6

Data Setup Time t

DSW

70 ns

IRQ Release from RD

t

IRD

2

ms

AC TEST CONDITIONS

Output Load: 50pF

Input Pulse Levels: 0V to 3.0V

Timing Measurement Reference Levels

Input: 1.5V

Output: 1.5V

Input Pulse Rise and Fall Times: 5ns

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