Rainbow-electronics DS14287 Bedienungsanleitung PDF herunterladen (Seite 18)

DS14285/DS14287

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AC ELECTRICAL CHARACTERISTICS Over the operating range

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

Cycle t

CYC

225 DC ns

Pulse Width, DS/E Low or RD/ WR

High

115 ns

Pulse Width, DS/E Low or RD/ WR

Low

80 ns

Input Rise and Fall Time t

, t

30 ns

R/ W Hold Time

RWH

10 ns

R/ W Setup Time Before DS/E

RWS

10 ns

Chip Select Setup Time Before DS,

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 AS/ALE

Fall

ASL

30 ns

Muxed Address Hold Time t

AHL

10 ns

Delay Time DS/E to AS/ALE Rise t

ASD

20 ns

Pulse Width AS/ALE High PW

ASH

60 ns

Delay Time, AS/ALE to DS/E Rise t

ASED

35 ns

Output Data Delay Time From DS/E or

DDR

10 75 ns 9

Data Setup Time t

DSW

60 ns

Reset Pulse Width t

RWL

µs

IRQ Release from DS

IRDS

µs

IRQ Release from RESET

IRR

µs

AC TEST CONDITIONS

Input Pulse Level: 0 to 3.0V

Input Rise/Fall Times: 5 ns

Input and Output Timing Reference Levels: 1.5V

OUTPUT LOAD Figure 5

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 24 25

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