PC8477B Datasheet, PDF (48/54 Pages) National Semiconductor (TI) – Advanced Floppy Disk Controller

7 0 Reference Section (Continued)
TABLE 7-1 8477B–82077 Parameter Comparison
Description
Absolute Maximum Ratings
Supply Voltage
DC Limits
V_IH Clock MIN
I_OL MFM pin (V_OL e 0 4V)
I_OH MFM pin (V_OH e 3 0V)
I_CC Low Power (Analog a Digital) Typical
I_CCLow Power (Analog a Digital) Tested
AC Timings
t₅ (t_ICP) – INTERNAL Clock Period
1 Mb s
500 kb s
300 kb s
250 kb s
t₈ (t_RR) – Read Active Pulse Width MIN
t₁₀ (t_RD) – Read to Valid Data
t₁₁ (t_RH) – Read Inactive Pulse Width
t₁₂ (t_DF) – Delay to Float
t₁₃ (t_RI) – Interrupt Delay from Read Inactive MAX
1 Mb s
500 kb s
300 kb s
250 kb s
t₁₆ (t_WW) – Write Active Pulse Width MIN
t₁₉ (t_DW) – Data Setup to Write Active
t₁₈ (t_WH) – Write Inactive Pulse Width
t_ADW – Address Setup to Write Inactive MIN
t₂₁ (t_WI) – Interrupt Delay from Write Inactive
1 Mb s
500 kb s
300 kb s
250 kb s
t₂₂ (t_QP) – DRQ Cycle Period MIN
t₂₃ (t_KQ) – DACK Active to DRQ Inactive MAX
t_23a (t_QK a t_KK) – DRQ to DACK Inactive
1 Mb s
500 kb s
300 kb s
250 kb s
t₂₄ (t_RQ) – RD WR Active to DRQ Inactive MAX
t₂₇ (t_QR) – DRQ to RD WR Active MIN
t₂₉ (t_TQ) – TC Active to DRQ Inactive MAX
t_KK – DACK Active Pulse Width MIN
t_KI – DACK Inactive Pulse Width MIN
t_QK – DRQ to DACK Active MIN
t₃₀ (t_RW) – Reset Pulse Width MIN
t_30a (t_RW) – Software Reset Pulse Width MIN (Worst Case)
t₃₁ (t_RC) – Reset to Control Inactive
t₃₂ (t_WDW) – Write Data Pulse Width MIN
1 Mb s
500 kb s
300 kb s
250 kb s
PC8477B
b0 5–7 0
20
40
b4 0
0 505
2 05
125
125
208
250
60
45
45
25
55
55
55
55
60
30
45
65
55
55
55
55
8
65
60
60
60
60
65
15
75
65
25
10
100
100
160
250
250
416
500
82077AA
b0 5–8 0
39
25
b2 5
15
no spec
125
250
420
500
90
80
60
35
250
375
545
625
90
70
60
no spec
250
375
545
625
65
75
no spec
no spec
no spec
no spec
100
0
150
no spec
no spec
no spec
7083
3500
2000
150
360
615
740
82077SL
b0 5–8 0
39
25
b2 5
125
250
420
500
90
80
60
35
250
375
545
625
90
70
60
no spec
250
375
545
625
65
75
83
166
280
333
100
0
150
no spec
no spec
no spec
7083
500
2000
150
360
615
740
Units
V
V
mA
mA
mA
mA
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ms
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
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