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參數資料
| 型號： | W78E51C |
| 廠商： | WINBOND ELECTRONICS CORP |
| 英文描述： | 8 bit micocontroller |
| 中文描述： | 8位micocontroller |
| 文件頁數： | 14/23頁 |
| 文件大小： | 302K |
| 代理商： | W78E51C |
W78E51C
- 14 -
8.3 A.C. Characteristics
The AC specifications are a function of the particular process used to manufacture the part, the ratings
of the I/O buffers, the capacitive load, and the internal routing capacitance. Most of the specifications
can be expressed in terms of multiple input clock periods (T
CP
), and actual parts will usually
experience less than a
±
20 nS variation. The numbers below represent the performance expected
from a 0.6micron CMOS process when using 2 and 4 mA output buffers.
8.3.1 Clock Input Waveform
T
T
XTAL1
F
CH
CL
OP,
T
CP
PARAMETER
SYMBOL
F
OP
T
CP
T
CH
T
CL
MIN.
0
25
10
10
TYP.
-
-
-
-
MAX.
40
-
-
-
UNIT
MHz
nS
nS
nS
NOTES
1
2
3
3
Operating Speed
Clock Period
Clock High
Clock Low
Notes:
1. The clock may be stopped indefinitely in either state.
2. The T
CP
specification is used as a reference in other specifications.
3. There are no duty cycle requirements on the XTAL1 input.
8.3.2 Program Fetch Cycle
PARAMETER
SYMBOL
MIN.
1 T
CP
-
1 T
CP
-
1 T
CP
-
TYP.
MAX.
UNIT
NOTES
Address Valid to ALE Low
T
AAS
-
-
nS
4
Address Hold from ALE Low
T
AAH
-
-
nS
1, 4
ALE Low to
PSEN
Low
T
APL
-
-
nS
4
PSEN
Low to Data Valid
T
PDA
-
-
2 T
CP
nS
2
Data Hold after
PSEN
High
T
PDH
0
-
1 T
CP
nS
3
Data Float after
PSEN
High
T
PDZ
0
-
1 T
CP
nS
ALE Pulse Width
T
ALW
2 T
CP
-
3 T
CP
-
2 T
CP
-
nS
4
PSEN
Pulse Width
T
PSW
3 T
CP
-
nS
4
Notes:
1. P0.0
P0.7, P2.0
P2.7 remain stable throughout entire memory cycle.
2. Memory access time is 3 T
CP
.
3. Data have been latched internally prior to
PSEN
going high.
4. "
" (due to buffer driving delay and wire loading) is 20 nS.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| W78E51C_06 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W78E51P-16 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| W78E51P-24 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| W78E51P-33 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| W78E51P-40 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
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