pc8477b National Semiconductor Corporation, pc8477b Datasheet - Page 48

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

7 0 Reference Section
Absolute Maximum Ratings
Supply Voltage
DC Limits
V
I
I
I
I
AC Timings
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
OL
OH
CC
CC
5
8
10
11
12
13
16
19
18
ADW
21
22
23
23a
24
27
29
KK
KI
QK
30
30a
31
32
IH
(t
1 Mb s
500 kb s
300 kb s
250 kb s
(t
1 Mb s
500 kb s
300 kb s
250 kb s
1 Mb s
500 kb s
300 kb s
250 kb s
1 Mb s
500 kb s
300 kb s
250 kb s
1 Mb s
500 kb s
300 kb s
250 kb s
– DACK Inactive Pulse Width MIN
Low Power (Analog
(t
(t
(t
(t
(t
(t
(t
(t
(t
(t
(t
(t
(t
(t
(t
(t
– DACK Active Pulse Width MIN
MFM pin (V
ICP
RR
– DRQ to DACK Active MIN
Clock MIN
Low Power (Analog
MFM pin (V
(t
(t
RD
RH
DF
RI
WW
DW
WH
WI
QP
KQ
RQ
QR
TQ
RW
RC
WDW
– Address Setup to Write Inactive MIN
QK
RW
) – Read Active Pulse Width MIN
) – Interrupt Delay from Read Inactive MAX
) – INTERNAL Clock Period
) – Interrupt Delay from Write Inactive
) – Delay to Float
) – TC Active to DRQ Inactive MAX
) – Read to Valid Data
) – Read Inactive Pulse Width
) – DRQ Cycle Period MIN
) – DACK Active to DRQ Inactive MAX
) – Reset to Control Inactive
) – RD WR Active to DRQ Inactive MAX
) – DRQ to RD WR Active MIN
) – Data Setup to Write Active
) – Write Inactive Pulse Width
) – Reset Pulse Width MIN
) – Write Active Pulse Width MIN
) – Software Reset Pulse Width MIN (Worst Case)
a
) – Write Data Pulse Width MIN
t
KK
OL
OH
) – DRQ to DACK Inactive
e
e
0 4V)
3 0V)
Description
a
a
Digital) Tested
Digital) Typical
(Continued)
TABLE 7-1 8477B – 82077 Parameter Comparison
48
b
PC8477B
0 5 – 7 0
0 505
b
2 05
125
125
208
250
100
100
160
250
250
416
500
2 0
4 0
60
45
45
25
55
55
55
55
60
30
45
65
55
55
55
55
65
60
60
60
60
65
15
75
65
25
10
8
4 0
b
82077AA
no spec
no spec
no spec
no spec
no spec
no spec
no spec
no spec
no spec
0 5 – 8 0
b
7083
3500
2000
125
250
420
500
250
375
545
625
250
375
545
625
100
150
150
360
615
740
3 9
2 5
1 5
6 5
90
80
60
35
90
70
60
75
0
2 5
b
82077SL
no spec
no spec
no spec
no spec
0 5 – 8 0
b
7083
2000
125
250
420
500
250
375
545
625
250
375
545
625
166
280
333
100
150
500
150
360
615
740
3 9
2 5
6 5
90
80
60
35
90
70
60
75
83
0
2 5
Units
mA
mA
mA
mA
ms
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
V
V