pc8477b National Semiconductor Corporation, pc8477b Datasheet - Page 40

• Manufacturer Part Number: pc8477b
• Description: Advanced Floppy Disk Controller
• Manufacturer: National Semiconductor Corporation

6 0 Device Description
6 2 AC ELECTRICAL CHARACTERISTICS
6 2 1 AC Test Conditions T
Load Circuit
6 2 2 Clock Timing
Symbol
t
t
t
t
t
CH
CL
CP24
ICP
DRP
MFM Data Rate
A
Clock High Pulse Width
Clock Low Pulse Width
Clock Period
Internal Clock Period (Table 6-1)
Data Rate Period (Table 6-1)
500 kb s
300 kb s
250 kb s
1 Mb s
e
0 C to
(Continued)
Parameter
a
70 C V
TABLE 6-1 Nominal t
FIGURE 6-1 Clock Timing
TL F 11332 – 14
CC
1000
2000
3333
4000
t
DRP
e
5 0V
g
40
10%
3 x t
3 x t
5 x t
6 x t
ICP
t
ICP
AC Testing Input
Output Waveform
CP
CP
CP
CP
t
DRP
Values
Min
16
16
40
Value
125
125
208
250
Units
Max
43
ns
ns
ns
ns
TL F 11332 – 16
TL F 11332 – 15
Units
ns
ns
ns