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PC87310 Datasheet(PDF) 50 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # PC87310
Description  PC87310 (SuperI/OTM) Dual UART with Floppy Disk Controller and Parallel Port
PDF  52 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC87310 Datasheet(HTML) 50 Page - National Semiconductor (TI)

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70 AC Electrical Characteristics TA e 0 Cto a70 C VDD ea5V g10% (Continued)
DRIVE WRITE TIMING
Symbol
Parameter
Conditions
Min
Max
Units
tWD
Write Data Pulse Width
250 kbs (MFM)
500
ns
300 kbs (MFM)
416
ns
500 kbs (MFM)
250
ns
1000 kbs(MFM)
225
ns
tHDS
Head Select Setup to Write Gate Assertion
40
m
s
tHDH
Head Select Hold from Write Gate
12
m
s
Note 1
Whenever WGATE is asserted the WDATA line is active At the end of each write one dummy byte is written before WGATE is deasserted
TLC10591 – 30
DRIVE TRACK ACCESS TIMING
Symbol
Parameter
Min
Max
Units
tDH
Direction Hold from End of Step
1 Step Time
tDRV
Drive Select or Motor Time from Write Strobe
100
ns
tDST
Direction Setup prior to Step
6
m
s
tIW
Index Pulse Width
100
ns
tSTP
Step Pulse Width
8
m
s
TLC10591 – 31
50



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