Rainbow-electronics AT89LS51 Manual do Utilizador descarregar pdf (Página 21)

AT89LS51

3053A–8051–05/02

AC Characteristics

Under operating conditions, load capacitance for Port 0, ALE/PROG, and PSEN = 100 pF; load capacitance for all other

outputs = 80 pF.

External Program and Data Memory Characteristics

Symbol Parameter

16 MHz Oscillator Variable Oscillator

UnitsMin Max Min Max

1/t

CLCL

Oscillator Frequency 0 16 MHz

LHLL

ALE Pulse Width 85 2t

CLCL

-40 ns

AVLL

Address Valid to ALE Low 22 t

CLCL

-40 ns

LLAX

Address Hold After ALE Low 32 t

CLCL

-30 ns

LLIV

ALE Low to Valid Instruction In 150 4t

CLCL

-100 ns

LLPL

ALE Low to PSEN Low 32 t

CLCL

-30 ns

PLPH

PSEN Pulse Width 142 3t

CLCL

-45 ns

PLIV

PSEN Low to Valid Instruction In 82 3t

CLCL

-105 ns

PXIX

Input Instruction Hold After PSEN 00ns

PXIZ

Input Instruction Float After PSEN 37 t

CLCL

-25 ns

PXAV

PSEN to Address Valid 75 t

CLCL

-8 ns

AVI V

Address to Valid Instruction In 207 5t

CLCL

-105 ns

PLAZ

PSEN Low to Address Float 10 10 ns

RLRH

RD Pulse Width 275 6t

CLCL

-100 ns

WLWH

WR Pulse Width 275 6t

CLCL

-100 ns

RLDV

RD Low to Valid Data In 147 5t

CLCL

-165 ns

RHDX

Data Hold After RD 00ns

RHDZ

Data Float After RD 65 2t

CLCL

-60 ns

LLDV

ALE Low to Valid Data In 350 8t

CLCL

-150 ns

AVDV

Address to Valid Data In 397 9t

CLCL

-165 ns

LLWL

ALE Low to RD or WR Low 137 239 3t

CLCL

-50 3t

CLCL

+50 ns

AVWL

Address to RD or WR Low 122 4t

CLCL

-130 ns

QVWX

Data Valid to WR Transition 13 t

CLCL

-50 ns

QVWH

Data Valid to WR High 287 7t

CLCL

-150 ns

WHQX

Data Hold After WR 13 t

CLCL

-50 ns

RLAZ

RD Low to Address Float 0 0 ns

WHLH

RD or WR High to ALE High 23 103 t

CLCL

-40 t

CLCL

+40 ns

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 27 28 29

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