MB90F438LPF datasheet(40/61 Pages) CYPRESS

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MB90435 Series

DS07-13727-2E

(5) Bus Timing (Read)

(MB90F438L (S) /437L (S) /438L (S) : VCC

= 3.5 V to 5.5 V, VSS = AVSS = 0.0 V, TA = −40 °C to +105 °C)

(MB90F439 (S) /439 (S) /V540G : VCC

= 5.0 V ± 10%, VSS = AVSS = 0.0 V, TA = −40 °C to +105 °C)

Parameter

Symbol

Pin name

Condition

Value

Units

Remarks

Min

Max

ALE pulse width

tLHLL

ALE

⎯

tCP/2

− 20

⎯

Valid address

→ALE↓time

tAVLL

ALE,

A16 to A23,

AD00 to AD15

tCP/2

− 20

⎯

ALE

↓→Address valid time

tLLAX

ALE,

AD00 to AD15

tCP/2

− 15

⎯

Valid address

→RD↓time

tAVRL

A16 toA23,

AD00 to AD15,

tCP

− 15

⎯

Valid address

→Valid data

input

tAVDV

A16 to A23,

AD00 to AD15

⎯

5 tCP/2

− 60

RD pulse width

tRLRH

3 tCP/2

− 20

⎯

↓→Valid data input

tRLDV

RD,

AD00 to AD15

⎯

3 tCP/2

− 60

↑→Data hold time

tRHDX

RD,

AD00 to AD15

⎯

↑→ALE↑time

tRHLH

RD, ALE

tCP/2

− 15

⎯

↑→Address valid time

tRHAX

RD, A16 to A23

tCP/2

− 10

⎯

Valid address

→CLK↑time

tAVCH

A16 to A23,

AD00 to AD15,

CLK

tCP/2

− 20

⎯

↓→CLK↑time

tRLCH

RD, CLK

tCP/2

− 20

⎯

ALE

↓→RD↓time

tLLRL

ALE, RD

tCP/2

− 15

⎯

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