參數(shù)資料
型號(hào): MC68307FG
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, MICROCONTROLLER, PQFP100
封裝: PLASTIC, QFP-100
文件頁數(shù): 19/34頁
文件大?。?/td> 354K
代理商: MC68307FG
26
MC68307 TECHNICAL INFORMATION
MOTOROLA
a. Wait states can be added.
Figure 10. Bus Arbitration Timing
PRELIMINARY 8051 BUS INTERFACE MODULE
AC ELECTRICAL SPECIFICATIONS
(VCC = 5.0V ± 0.5V or 3.3Vdc ± 0.3V; GND = 0Vdc; TA = TL to TH) (See Figures 11 and 12)
Symbol
Characteristic
3.3V
5V
Unit
8 MHz
16.67 MHz
Min
Max
Min
Max
tcyc
Cycle time
120
60
ns
TLHLL
ALE pulse width
2 x tcyc – 40
2 x tcyc – 40
ns
TAVLL
Address valid to ALE low
tcyc – 40
tcyc – 40
ns
TLLAX
Address hold after ALE low
tcyc – 35
tcyc – 35
ns
TRLRH
RD pulse widtha
5 x tcyc
5 x tcyc
—8051
ns
TWLWH
WR pulse width(1)
5 x tcyc
5 x tcyc
—ns
TRLDV
RD low to valid data in(1)
5 x tcyc – 165
5 x tcyc – 165
ns
TRHDX
Data hold after RD
0—0—
ns
TRHDZ
Data float after RD
0.5 x tcyc
0.5 x tcyc
ns
TLLDV
ALE low to valid data in(1)
8 x tcyc – 150
8 x tcyc – 150
ns
TAVDV
Address to valid data in(1)
9 x tcyc – 165
9 x tcyc – 165
ns
TLLWL
ALE low to RD or WR low
3 x tcyc– 50 3 x tcyc + 50 3 x tcyc– 50 3 x tcyc + 50
ns
TAVWL
Address to RD low or WR low
4 x tcyc – 130
4 x tcyc – 130
ns
TQVWX
Data valid to WR transition
tcyc – 60
tcyc – 60
ns
TQVWH
Data valid to WR high(1)
7 x tcyc– 150
7 x tcyc– 150
ns
TWHQX
Data held after WR
tcyc– 50
tcyc– 50
ns
TRLAZ
RD low to address float
————
ns
TWHLH
RD or WR high to ALE high
tcyc– 40
tcyc+ 50
tcyc– 40
tcyc+ 50
ns
NOTE:
CLK
Strobes
BR
BGACK
BG
R/W
and
36
35
46
39
34
38
33
37
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