Rainbow Electronics AT89LS51 - Manual (Page 21)

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
Units Min Max Min Max
1/t
CLCL
Oscillator Frequency 0 16 MHz
t
LHLL
ALE Pulse Width 85 2t
CLCL
-40 ns
t
AVLL
Address Valid to ALE Low 22 t
CLCL
-40 ns
t
LLAX
Address Hold After ALE Low 32 t
CLCL
-30 ns
t
LLIV
ALE Low to Valid Instruction In 150 4t
CLCL
-100 ns
t
LLPL
ALE Low to PSEN Low 32 t
CLCL
-30 ns
t
PLPH
PSEN Pulse Width 142 3t
CLCL
-45 ns
t
PLIV
PSEN Low to Valid Instruction In 82 3t
CLCL
-105 ns
t
PXIX
Input Instruction Hold After PSEN 0 0 ns
t
PXIZ
Input Instruction Float After PSEN 37 t
CLCL
-25 ns
t
PXAV
PSEN to Address Valid 75 t
CLCL
-8 ns
t
AVIV
Address to Valid Instruction In 207 5t
CLCL
-105 ns
t
PLAZ
PSEN Low to Address Float 10 10 ns
t
RLRH
RD Pulse Width 275 6t
CLCL
-100 ns
t
WLWH
WR Pulse Width 275 6t
CLCL
-100 ns
t
RLDV
RD Low to Valid Data In 147 5t
CLCL
-165 ns
t
RHDX
Data Hold After RD 0 0 ns
t
RHDZ
Data Float After RD 65 2t
CLCL
-60 ns
t
LLDV
ALE Low to Valid Data In 350 8t
CLCL
-150 ns
t
AVDV
Address to Valid Data In 397 9t
CLCL
-165 ns
t
LLWL
ALE Low to RD or WR Low 137 239 3t
CLCL
-50 3t
CLCL
+50 ns
t
AVWL
Address to RD or WR Low 122 4t
CLCL
-130 ns
t
QVWX
Data Valid to WR Transition 13 t
CLCL
-50 ns
t
QVWH
Data Valid to WR High 287 7t
CLCL
-150 ns
t
WHQX
Data Hold After WR 13 t
CLCL
-50 ns
t
RLAZ
RD Low to Address Float 0 0 ns
t
WHLH
RD or WR High to ALE High 23 103 t
CLCL
-40 t
CLCL
+40 ns