參數(shù)資料
型號(hào): DS89C21TMX
元件分類: 收發(fā)器
英文描述: Transceiver
中文描述: 收發(fā)器
文件頁(yè)數(shù): 4/48頁(yè)
文件大小: 934K
代理商: DS89C21TMX
DS89C430/DS89C440/DS89C450
4 of 48
AC CHARACTERISTICS
(V
CC
= 4.5V to 5.5V, T
O
= -40°C to +85°C.) (See
Figure 1
,
Figure 2
, and
Figure 3
.)
1-CYCLE
PAGE MODE 1
2-CYCLE
PAGE MODE 1
4-CYCLE
PAGE MODE 1
PAGE MODE 2
NONPAGE MODE
PARAMETER
SYMBOL
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
UNITS
System Clock External
Oscillator (Note 15)
1/t
CLCL
0
33
0
33
0
33
0
33
0
33
System Clock External Crystal
(Note 15)
1/t
CLCL
1
33
1
33
1
33
1
33
1
33
MHz
ALE Pulse Width (Note 16)
t
LHLL
0.5t
CLCL
- 2
+ t
STC3
t
CLCL
- 2
+ t
STC3
2t
CLCL
- 4
+ t
STC3
1.5t
CLCL
- 5
+ t
STC3
1.5t
CLCL
- 5
+ t
STC3
ns
Port 0 Instruction Address Valid
to ALE Low
t
AVLL
t
CLCL
- 3
0.5t
CLCL
- 3
ns
Port 2 Instruction Address Valid
to ALE Low
t
AVLL2
0.5t
CLCL
- 4
0.5t
CLCL
- 4
1.5t
CLCL
- 4
0.5t
CLCL
- 4
t
CLCL
- 4
ns
Port 0 Data AddressValid to
ALE Low
t
AVLL3
t
CLCL
- 3 +
t
STC3
0.5t
CLCL
- 3
+ t
STC3
ns
Program Address Hold After
ALE Low
t
LLAX
0.5t
CLCL
- 8
1.5t
CLCL
- 8
2.5t
CLCL
- 8
1t
CLCL
- 10
1t
CLCL
- 10
ns
Address Hold after ALE Low
MOVX Write
t
LLAX2
0.5t
CLCL
- 8
+ t
STC4
1.5t
CLCL
- 8
+ t
STC4
2.5t
CLCL
- 8
+ t
STC3
0.5t
CLCL
- 8
+ t
STC2
0.5t
CLCL
- 8
+ t
STC2
ns
Address Hold after ALE Low
MOVX Read
t
LLAX3
0.5t
CLCL
- 8
+ t
STC4
1.5t
CLCL
- 8
+ t
STC4
2.5t
CLCL
- 8
+ t
STC3
0.5t
CLCL
- 8
+ t
STC3
0.5t
CLCL
- 8
+ t
STC2
ns
ALE Low to Valid Instruction In
t
LLIV
2t
CLCL
- 6
2t
CLCL
- 6
ns
ALE Low to
PSEN
Low
t
LLPL
1.5t
CLCL
- 6
0.5t
CLCL
- 2
ns
PSEN
Pulse Width for Program
Fetch
t
PLPH
t
CLCL
- 5
t
CLCL
- 5
2t
CLCL
- 5
t
CLCL
- 5
2t
CLCL
- 5
ns
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