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DS87C550 데이터시트(PDF) 39 Page - Dallas Semiconductor

부품명 DS87C550
상세설명  EPROM High-Speed Micro with A/D and PWM
PDF  50 Pages
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제조업체  DALLAS [Dallas Semiconductor]
홈페이지  https://www.maximintegrated.com/en.html
Logo DALLAS - Dallas Semiconductor

DS87C550 데이터시트(HTML) 39 Page - Dallas Semiconductor

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DS87C550
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MOVX CHARACTERISTICS CONT’D
Data Hold
after Write
tWHQX
0.25tMCS-5
0.5tMCS-5
1.5tMCS-10
ns
CST=0
1<=CST<=3
4<=CST<=7
RD
Low to
Address Float
tRLAZ
-((0.125 tMCS)-5)
ns
RD
or WR High
to ALE High
tWHLH
0
0.25tMCS-5
1.25tMCS-10
10
0.25tMCS+5
1.25tMCS+10
ns
CST=0
1<=CST<=3
4<=CST<=7
NOTES FOR MOVX CHARACTERISTICS USING STRETCH MEMORY
CYCLES
§ t
MCS is a time period related to the Stretch memory cycle selection. The following table shows the
value of tMCS for each Stretch selection.
§ C
ST is the stretch cycle value as determined by the MD2, MD1, & MD0 bits of the CKCON register.
tMCS TIME PERIODS
System Clock Selection
tMCS
4X/ 2X , CD1, CD0 = 100
0.5 tCLCL
4X/ 2X , CD1, CD0 = 000
1 tCLCL
4X/ 2X , CD1, CD0 = x10
4 tCLCL
4X/ 2X , CD1, CD0 = x11
1024 tCLCL
RD
, WR PULSE WIDTH WITH STRETCH CYCLES
RD
, WR Pulse Width (in oscillator clocks)
MD2
MD1
MD0
MOVX
Machine
Cycles
4X/ 2X =1
CD1:0=00
4X/ 2X =0
CD1:0=00
4X/ 2X =x
CD1:0=10
4X/ 2X =x
CD1:0=11
0
0
0
2
0.5 tCLCL
1 tCLCL
2 tCLCL
2048 tCLCL
0
0
1
3
tCLCL
2 tCLCL
4 tCLCL
4096 tCLCL
0
1
0
4
2 tCLCL
4 tCLCL
8 tCLCL
8192 tCLCL
0
1
1
5
3 tCLCL
6 tCLCL
12 tCLCL
12288 tCLCL
1
0
0
9
4 tCLCL
8 tCLCL
16 tCLCL
16384 tCLCL
1
0
1
10
5 tCLCL
10 tCLCL
20 tCLCL
20480 tCLCL
1
1
0
11
6 tCLCL
12 tCLCL
24 tCLCL
24576 tCLCL
1
1
1
12
7 tCLCL
14 tCLCL
28 tCLCL
28672 tCLCL
EXTERNAL CLOCK CHARACTERISTICS
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
NOTES
Clock High Time
tCHCX
10
ns
Clock Low Time
tCLCX
10
ns
Clock Rise Time
tCLCL
5
ns
Clock Fall Time
tCHCL
5
ns



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