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| 型號(hào)： | AM486 |
| 英文描述： | Am486 Microprocessor Software User＇s Manual? 4.40MB (PDF) |
| 中文描述： | Am486微處理器軟件用戶手冊？ 4.40MB（PDF格式） |
| 文件頁數(shù)： | 42/52頁 |
| 文件大?。?/td> | 1242K |
| 代理商： | AM486 |
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42
Am486DE2 Microprocessor
Switching Characteristics for 33-MHz Bus (66-MHz Microprocessor)
V
CC
= 3.3 V ±0.3 V; T
CASE
= 0°C to + 85°C; C
L
= 50 pF unless otherwise specified
1
Symbol
Parameter
Min
8
30
Max
33
125
Unit
MHz
ns
Figure
Notes
Frequency
CLK Period
Note 2
t
1
39
t
1a
CLK Period Stability
0.1%
Adjacent Clocks
Notes 3 and 4
Note 3
Note 3
Note 3
Note 3
Note 5
t
2
t
3
t
4
t
5
CLK High Time at 2 V
CLK Low Time at 0.8 V
CLK Fall Time (2 V–0.8 V)
CLK Rise Time (0.8 V–2 V)
A31–A2, PWT, PCD, BE3–BE0, M/IO, D/C, CACHE,
W/R, ADS, LOCK, FERR, BREQ, HLDA,
SMIACT, HITM Valid Delay
A31–A2, PWT, PCD, BE3–BE0, M/IO, D/C, CACHE,
W/R, ADS, LOCK Float Delay
PCHK Valid Delay
BLAST, PLOCK, Valid Delay
BLAST, PLOCK, Float Delay
D31–D0, DP3–DP0 Write Data Valid Delay
D31–D0, DP3–DP0 Write Data Float Delay
EADS, INV, WB/WT Setup Time
EADS, INV, WB/WT Hold Time
KEN, BS16, BS8 Setup Time
KEN, BS16, BS8 Hold Time
RDY, BRDY Setup Time
RDY, BRDY Hold Time
HOLD, AHOLD Setup Time
BOFF Setup Time
HOLD, AHOLD, BOFF Hold Time
RESET, FLUSH, A20M, NMI, INTR, IGNNE,
STPCLK, SRESET, SMI Setup Time
RESET, FLUSH, A20M, NMI, INTR, IGNNE,
STPCLK, SRESET, SMI Hold Time
D31–D0, DP3–DP0, A31–A4 Read Setup Time
D32–D0, DP3–DP0, A31–A4 Read Hold Time
1.
Specifications assume C
L
= 50 pF. I/O Buffer model must be used to determine delays due to loading (trace and
component). First-order I/O buffer models for the processor are available.
2.
0-MHz operation guaranteed during stop clock operation or 1x Static Clock mode.
3.
Not 100% tested. Guaranteed by design characterization.
4.
For faster transitions (>0.1% between adjacent clocks), use the Stop Clock protocol to switch operating frequency.
5.
All timings are referenced at 1.5 V (as illustrated in the listed figures) unless otherwise noted.
11
11
ns
ns
ns
ns
39
39
39
39
3
3
t
6
3
14
ns
40
t
7
3
20
ns
41
Note 3
t
8
t
8a
t
9
t
10
t
11
t
12
t
13
t
14
t
15
t
16
t
17
t
18
t
18a
t
19
3
3
3
3
3
5
3
5
3
14
14
20
14
20
ns
ns
ns
ns
ns
ns
ns
ns
ns
42
40
41
40
41
43
43
43
43
Note 3
Note 3
5
3
6
7
3
ns
ns
ns
ns
ns
44
44
43
43
43
t
20
5
ns
43
Note 5
t
21
3
ns
43
Note 5
t
22
t
23
5
3
ns
ns
43, 44
43, 44
Notes:
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