DS80C390 datasheet(35/58 Pages) DALLAS

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DS80C390

35 of 58

110199

MULTIPLEXED EXTERNAL PROGRAM MEMORY READ CYCLE

MOVX CHARACTERISTICS (Multiplexed address/data bus)

PARAMETER

SYMBOL

MIN

MAX

UNITS STRETCH

VALUES

CST (MD2:0)

tLHLL2

0.375 tMCS -5

CST = 0

0.5 tMCS -5

≤ C

≤ 3

MOVX ALE Pulse Width

1.5 tMCS -10

≤ C

≤ 7

tAVLL2

0.125 tMCS -5

CST = 0

0.25tMCS -5

≤ C

≤ 3

Port 0 MOVX Address,

CE0

− ,

PCE0

− Valid to

ALE Low

1.25 tMCS -10

≤ C

≤ 7

tLLAX2

0.125 tMCS -5

≤ C

≤3

Address Hold after MOVX

Read/Write

1.125 tMCS -5

≤ C

≤ 7

Pulse Width

tRLRH

0.5 tMCS -5

CST =0

CST

•t

MCS -10

≤ C

≤ 7

Pulse Width

tWLWH

0.5 tMCS -5

CST =0

CST

•t

MCS -10

≤ C

≤ 7

Low to Valid Data In

tRLDV

0.5 tMCS -20

CST =0

CST

•t

MCS -20

≤ C

≤ 7

Data Hold after Read

tRHDX

Data Float after Read

tRHDZ

0.25 tMCS -5

CST = 0

0.5tMCS -5

≤ C

≤ 3

1.5 tMCS -5

≤ C

≤ 7

ALE Low to Valid Data In

tLLDV

0.625 tMCS -20

CST = 0

(CST+0.25)

•t

MCS -40

≤ C

≤ 3

(CST+1.25)

•t

MCS -40

≤ C

≤ 7

DS80C390 Datasheet(PDF) 35 Page - Dallas Semiconductor

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