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PC8477B Datasheet(PDF) 44 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) 44 Page - National Semiconductor (TI)

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60 Device Description (Continued)
626 Reset Timing
Symbol
Parameter
Min
Max
Units
tRW
Reset Width (Note 10)
100
ns
tRC
Reset to Control Inactive
300
ns
Note 10
The software reset pulse width is 100 ns The hardware reset pulse width with an external 10 kX pull-up or pull-down resistor on the MFM pin is 100 ns
When using the internal pull-up resistor on the MFM pin the hardware reset pulse width is 170 ns (assumes no load on MFM)
TLF11332 – 20
FIGURE 6-5 Reset Timing
627 Write Data Timing
Symbol
Parameter
Min
Max
Units
tWDW
Write Data Pulse Width
Table 6-2
ns
tHDS
HDSEL Setup to WGATE Active
100
m
s
tHDH
HDSEL Hold from WGATE Inactive
750
m
s
TABLE 6-2 Minimum tWDW Values
Data Rate
tDRP
tWDW
tWDW Value
Units
1 Mbs
1000
2 x tICP
250
ns
500 kbs
2000
2 x tICP
250
ns
300 kbs
3333
2 x tICP
375
ns
250 kbs
4000
2 x tICP
500
ns
TLF11332 – 21
FIGURE 6-6 Write Data Timing
44



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