Maxim DS87C530 Clock User Manual


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DS87C530/DS83C530 EPROM/ROM Microcontrollers with Real-Time Clock
36 of 47
MOVX CHARACTERISTICS USING STRETCH MEMORY CYCLES
VARIABLE CLOCK
PARAMETER SYMBOL
MIN MAX
UNITS STRETCH
1.5t
CLCL
-5 t
MCS
=0
Data Access ALE Pulse Width t
LHLL2
2t
CLCL
-5
ns
t
MCS
>0
0.5t
CLCL
-5 t
MCS
=0
Port 0 Address Valid to ALE Low t
AVLL2
t
CLCL
-5
ns
t
MCS
>0
0.5t
CLCL
-10 t
MCS
=0
Address Hold After ALE Low for
MOVX Write
t
LLAX2
t
CLCL
-7
ns
t
MCS
>0
2t
CLCL
-5 t
MCS
=0
RD Pulse Width
t
RLRH
t
MCS
-10
ns
t
MCS
>0
2t
CLCL
-5 t
MCS
=0
WR Pulse Width
t
WLWH
t
MCS
-10
ns
t
MCS
>0
2t
CLCL
-22 t
MCS
=0
RD Low Valid Data In
t
RLDV
t
MCS
-24
ns
t
MCS
>0
Data Hold After Read t
RHDX
0 ns —
t
CLCL
-5 ns t
MCS
=0
Data Float After Read t
RHDZ
2t
CLCL
-5 t
MCS
>0
2.5t
CLCL
-31 t
MCS
=0
ALE Low to Valid Data In t
LLDV
t
MCS
+t
CLCL
-26
ns
t
MCS
>0
3t
CLCL
-29 t
MCS
=0
Port 0 Address to Valid Data In t
AVDV1
t
MCS
+2
CLCL
-29
ns
t
MCS
>0
3.5t
CLCL
-37 t
MCS
=0
Port 2 Address to Valid Data In t
AVDV2
t
MCS
+2.5
LCL
-37
ns
t
MCS
>0
0.5t
CLCL
-10 0.5t
CLCL
+5 t
MCS
=0
ALE Low to RD or WR Low
t
LLWL
t
CLCL
-5 t
CLCL
+5
ns
t
MCS
>0
t
CLCL
-9 t
MCS
=0
Port 0 Address to RD or WR Low
t
AVWL1
2t
CLCL
-7
ns
t
MCS
>0
1.5t
CLCL
-17 t
MCS
=0
Port 2 Address to RD or WR Low
t
AVWL2
2.5t
CLCL
-16
ns
t
MCS
>0
Data Valid to WR Transition
t
QVWX
-6 ns
t
CLCL
-5 t
MCS
=0
Data Hold After Write t
WHQX
2t
CLCL
-6
ns
t
MCS
>0
RD Low to Address Float
t
RLAZ
(Note 1) ns
-4 10 t
MCS
=0
RD or WR High to ALE High
t
WHLH
t
CLCL
-5 t
CLCL
+5
ns
t
MCS
>0
Note 1:
t
MCS
is a time period related to the Stretch memory cycle selection. The following table shows the value of t
MCS
for each Stretch
selection.
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