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UPD765B Datasheet(PDF) 7 Page - NEC

No. de pieza UPD765B
Descripción Electrónicos  Single/Double Density Floppy-Disk Controller
PDF  17 Pages
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Fabricante Electrónico  NEC [NEC]
Página de inicio  http://www.nec.com/
Logo NEC - NEC

UPD765B Datasheet(HTML) 7 Page - NEC

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AC Characteristics (cont)
Parameter
Symbol
Min Typ (1) Max Unit Conditions
delay from DRQ
800
ns S-MHz CLK
Note 4
delay
from DRQ
250
ns
response time
from DRQ
12
Notes:
(1) Typical values for TA = 25°C and nominal supply voltage.
(2) Under software controLThe range is from 1
ms to 16ms at 8-Mhz
clock period, and 2 ms to 32 ms at
4-Mhz
clock period.
(3) When one device is executing
a SEEK operation, SENSE DRIVE
STATUS is executed on another device.
(4) Double these values for a
4-MHZ
clock period
(5)
Thedrivesiderating
has a variance of ~5Ons from the minimum
value.
liming Waveforms
Processor Read Operation
Processor
Write
Operation
CS, DACK



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