MSM66579 datasheet(17/37 Pages) OKI

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PEDL66579-03

1Semiconductor

MSM66579 Family

17/37

(2) Multiplexed bus type

External program memory control

DD = 4.5 to 5.5 V, Ta = –30 to +70°C)

Parameter

Symbol

Condition

Min.

Max.

Unit

Cycle time

cyc

OSC = 30 MHz

33.3

—

Clock pulse width (HIGH level)

tφWH

—

Clock pulse width (LOW level)

tφWL

—

ALE pulse width

2 t

φ – 10

—

PSEN pulse width

2 t

φ – 14

—

PSEN pulse delay time

PAD

φ – 10

φ + 10

Low address setup time

ALS

φ – 20

φ + 3

Low address hold time

ALH

φ – 10

φ + 10

High address setup time

AHS

φ – 30

φ + 3

High address hold time

AHH

φ + 10

Instruction setup time

—

Instruction hold time

L = 50 pF

φ – 3

Note: t

φ = t

cyc/2

cyc

INST0 to 7

tφ

CPUCLK

PSEN

A8 to A19

AD0 to AD7

ALE

PC0 to 7

PC8 to 19

tφ

PAD

ALS

ALH

AHS

AHH

Bus timing during no wait cycle time

MSM66579 Datasheet(PDF) 17 Page - OKI electronic componets

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