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PC8477B Datasheet(PDF) 40 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # PC8477B
Description  Advanced Floppy Disk Controller
PDF  54 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC8477B Datasheet(HTML) 40 Page - National Semiconductor (TI)

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60 Device Description (Continued)
62 AC ELECTRICAL CHARACTERISTICS
621 AC Test Conditions
TA e 0 Cto a70 C VCC e 50V g10%
Load Circuit
TLF11332 – 14
AC Testing Input
Output Waveform
TLF11332 – 15
622 Clock Timing
Symbol
Parameter
Min
Max
Units
tCH
Clock High Pulse Width
16
ns
tCL
Clock Low Pulse Width
16
ns
tCP24
Clock Period
40
43
ns
tICP
Internal Clock Period (Table 6-1)
tDRP
Data Rate Period (Table 6-1)
TABLE 6-1 Nominal tICP tDRP Values
MFM Data Rate
tDRP
tICP
Value
Units
1 Mbs
1000
3 x tCP
125
ns
500 kbs
2000
3 x tCP
125
ns
300 kbs
3333
5 x tCP
208
ns
250 kbs
4000
6 x tCP
250
ns
TLF11332 – 16
FIGURE 6-1 Clock Timing
40



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