PC8477BV-1 National Semiconductor, PC8477BV-1 Datasheet - Page 44

• Manufacturer Part Number: PC8477BV-1
• Description: IC ADVANCED FLOPPY CTRLR 68PLCC
• Manufacturer: National Semiconductor
• Series: SuperFDC™r

Specifications of PC8477BV-1

• Controller Type: Floppy Disk Controller
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 68-LCC (J-Lead)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Supply: -
• Interface: -
• Other names: *PC8477BV-1

6 0 Device Description
6 2 6 Reset Timing
Note 10 The software reset pulse width is 100 ns The hardware reset pulse width with an external 10 k
When using the internal pull-up resistor on the MFM pin the hardware reset pulse width is 170 ns (assumes no load on MFM)
6 2 7 Write Data Timing
Symbol
t
t
t
WDW
HDS
HDH
t
t
Symbol
RW
RC
Data Rate
1 Mb s
500 kb s
300 kb s
250 kb s
Write Data Pulse Width
HDSEL Setup to WGATE Active
HDSEL Hold from WGATE Inactive
Reset Width (Note 10)
Reset to Control Inactive
Parameter
Parameter
(Continued)
1000
2000
3333
4000
t
TABLE 6-2 Minimum t
DRP
FIGURE 6-6 Write Data Timing
FIGURE 6-5 Reset Timing
2 x t
2 x t
2 x t
2 x t
t
WDW
44
ICP
ICP
ICP
ICP
WDW
Min
100
Values
t
Table 6-2
WDW
Min
100
750
250
250
375
500
Value
pull-up or pull-down resistor on the MFM pin is 100 ns
Max
300
Units
ns
ns
ns
ns
Max
TL F 11332 – 21
TL F 11332 – 20
Units
ns
ns
Units
ns
s
s