參數(shù)資料
型號(hào)： DS87C550-FNL
英文描述： EPROM High-Speed Micro with A/D and PWM
中文描述： 存儲(chǔ)器高速微與A / D及PWM
文件頁數(shù)： 38/50頁
文件大?。?/td> 763K
代理商： DS87C550-FNL
DS87C550
38 of 50
§
All signals characterized with load capacitance of 80 pF except Port 0, ALE,
PSEN
,
RD
and
WR
with 100 pF.
§
Interfacing to memory devices with float times (turn off times) over 25 ns may cause contention. This
will not damage the parts, but will cause an increase in operating current.
§
Specifications assume a 50% duty cycle for the oscillator. Port 2 and ALE timing will change in
relation to duty cycle variation.
MOVX CHARACTERISTICS
VARIABLE CLOCK
PARAMETER
SYMBOL
MIN
MAX
UNITS
STRETCH
VALUES C
ST
(MD2:0)
C
ST
=0
1<=C
ST
<=3
4<=C
ST
<=7
C
ST
=0
1<=C
ST
<=3
4<=C
ST
<=7
C
ST
=0
1<=C
ST
<=7
C
ST
=0
1<=C
ST
<=7
C
ST
=0
1<=C
ST
<=7
Data Access ALE
Pulse Width
t
LHLL2
0.375t
MCS
-5
0.5t
MCS
-5
1.5t
MCS
-10
0.125t
MCS
-5
0.25t
MCS
-5
1.25t
MCS
-10
0.5t
MCS
-5
C
ST
*t
MCS
-10
0.5t
MCS
-5
C
ST
*t
MCS
-10
ns
Address Hold after
ALE Low for
MOVX Write
t
LLAX2
ns
RD
Pulse Width
t
RLRH
ns
WR
Pulse Width
t
WLWH
ns
RD
Low to
Valid Data In
Data Hold
after Read
t
RLDV
0.5t
MCS
-20
C
ST
*t
MCS
-20
ns
t
RHDX
0
ns
Data Float
after Read
t
RHDZ
0.25t
MCS
-5
0.5t
MCS
-5
1.5t
MCS
-15
0.625t
MCS
-20
(C
ST
+0.25)*t
MCS
-40
(C
ST
+1.25)*t
MCS
-40
0.75t
MCS
-20
(C
ST
+0.375)*t
MCS
-20
(C
ST
+1.375)*t
MCS
-20
0.875t
MCS
-20
(C
ST
+0.5)*t
MCS
-20
(C
ST
+1.5)*t
MCS
-20
1.25t
MCS
+5
0.25t
MCS
+5
1.25t
MCS
+10
ns
C
ST
=0
1<=C
ST
<=3
4<=C
ST
<=7
C
ST
=0
1<=C
ST
<=3
4<=C
ST
<=7
C
ST
=0
1<=C
ST
<=3
4<=C
ST
<=7
C
ST
=0
1<=C
ST
<=3
4<=C
ST
<=7
C
ST
=0
1<=C
ST
<=3
4<=C
ST
<=7
C
ST
=0
1<=C
ST
<=3
4<=C
ST
<=7
C
ST
=0
1<=C
ST
<=3
4<=C
ST
<=7
ALE Low to
Valid Data In
t
LLDV
ns
Port 0 Address
to Valid Data In
t
AVDV1
ns
Port 2 Address
to Valid Data In
t
AVDV2
ns
ALE Low to
RD
or
WR
Low
t
LLWL
0.125t
MCS
-5
0.25t
MCS
-5
1.25t
MCS
-10
0.25t
MCS
-5
0.5t
MCS
-5
2.5t
MCS
-10
0.375t
MCS
-5
0.625t
MCS
-5
2.625t
MCS
-10
ns
Port 0 Address to
RD
or
WR
Low
t
AVWL1
ns
Port 2 Address to
RD
or
WR
Low
t
AVWL2
ns
Data Valid to
WR
Transition
t
QVWX
-5
ns
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