Oki MSM80C154S Manual do Utilizador descarregar pdf (Página 29)

287

MSM80C154S/83C154S¡ Semiconductor

AC Characteristics

(1) External program memory access AC characteristics

Parameter Symble Unit

Min. Max.

1 to 24 MHz

Variable clock from

41.7 1000 ns

CLCL

XTAL1, XTAL 2 Oscillation Cycle

CLCL

-40 — ns

LHLL

ALE Signal Width

CLCL

-15 — ns

AVLL

Address Setup Time

(to ALE Falling Edge)

CLCL

-35 — ns

LLAX

Address Hold Time

(from ALE Falling Edge)

—4t

CLCL

-100 ns

LLPL

Instruction Data Read Time

(from ALE Falling Edge)

CLCL

-30 — ns

LLPL

From ALE Falling Edge to PSEN

Falling Edge

CLCL

-35 — ns

PLPH

PSEN Signal Width

—3t

CLCL

-45 ns

PLIV

Instruction Data Read Time

(from PSEN Falling Edge)

0—ns

PXIX

Instruction Data Hold Time

(from PSEN Rising Edge)

—1t

CLCL

-20 ns

PXIZ

Bus Floating Time after Instruction

Data Read (from PSEN Rising Edge)

—5t

CLCL

-105 ns

AVIV

Instruction Data Read Time

(from Address Output)

0—ns

AZPL

Bus Floating Time(PSEN Rising

Edge from Address float)

CLCL

-20 — ns

PXAV

Address Output Time from PSEN

Rising Edge

=2.2 to 6.0V, V

=0V, Ta=–40°C to +85°C

PORT 0, ALE, and PSEN connected with 100pF load, other connected with 80pF load

*1 The variable check is from 0 to 24 MHz when the external check is used.

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Oki MSM80C154S Manual do Utilizador Página 29

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