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PC87311A Datasheet(PDF) 71 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de pieza PC87311A
Descripción Electrónicos  PC87311A/PC87312 (SuperI/OTM II/III) Floppy Disk Controller with Dual UARTs, Parallel Port, and IDE Interface
PDF  78 Pages
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC87311A Datasheet(HTML) 71 Page - National Semiconductor (TI)

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90 Device Description (Continued)
929 Reset Timing
Symbol
Parameter
Min
Max
Units
tRW
Reset Width (Note 1)
100
ns
tRC
Reset to Control Inactive
300
ns
Note 1
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 pF load)
TLF11362 – 27
Note 2
DRQ and IRQ6 will be TRI-STATE after time tRC when in the AT or Model 30 mode
FIGURE 9-9 Reset Timing
9210 Write Data Timing
Symbol
Parameter
Min
Max
Units
tHDH
HDSEL Hold from WGATE Inactive
750
m
s
tHDS
HDSEL Setup to WGATE Active
100
m
s
tWDW
Write Data Pulse Width
Table 9-2
ns
TABLE 9-2 Minimum tWDW Values
Data Rate
tDRP
tWDW
tWDW Value
Units
1 Mbs
1000
2 c tICP
250
ns
500 kbs
2000
2 c tICP
250
ns
300 kbs
3333
2 c tICP
375
ns
250 kbs
4000
2 c tICP
500
ns
TLF11362 – 28
FIGURE 9-10 Write Data Timing
71



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