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PC87303 Datasheet(PDF) 99 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # PC87303
Description  PC87303VUL SuperI/OTM Sidewinder Lite Floppy Disk Controller, Keyboard Controller, Real-Time Clock, Dual UARTs, IEEE 1284 Parallel Port, and IDE Inter
PDF  114 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC87303 Datasheet(HTML) 99 Page - National Semiconductor (TI)

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100 Electrical Characteristics (Continued)
1022 Clock Timing
Symbol
Parameter
Min
Max
Units
tCH
Clock High Pulse Width
16
ns
tCL
Clock Low Pulse Width
16
ns
tCP
Clock Period
40
43
ns
tICP
Internal Clock Period
(Table 10-1)
ns
tDRP
Data Rate Period
(Table 10-1)
ns
TABLE 10-1 Nominal tICP tDRP Values
MFM Data Rate
tDRP
tICP
Value
Units
1 Mbps
1000
3 x tCP
125
ns
500 kbps
2000
3 x tCP
125
ns
300 kbps
3333
5 x tCP
208
ns
250 kbps
4000
6 x tCP
250
ns
TLC12074 – 55
FIGURE 10-1 Clock Timing
99



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