dp83251 National Semiconductor Corporation, dp83251 Datasheet - Page 80

• Manufacturer Part Number: dp83251
• Description: Player Device Fddi Physical Layer Controller
• Manufacturer: National Semiconductor Corporation

7 0 Electrical Characteristics
7 4 AC ELECTRICAL CHARACTERISTICS
The AC Electrical characteristics are over the operating range unless otherwise specified
AC Characteristics for the Control Bus Interface
Asynchronous Definitions
Note Min Max numbers are based on T2
Symbol
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10
T11
T12
T13
T14a
T14b
T14c
T15
T16
T17
T18
T19
T20a
T20b
T20c
T21
T22
T4 (min)
T4 (max)
T7 (min)
T7 (max)
T8 (min)
T8 (max)
CE Setup to LBC
LBC Period
LBC to ACK Low
CE Low to ACK Low
LBC Low to CBD(7-0) and CBP Valid
LBC to CBD(7-0) and CBP Active
CE Low to CBD(7-0) and CBP Active
CE Low to CBD(7-0) and CBP Valid
LBC Pulse Width High
LBC Pulse Width Low
CE High to ACK High
R W CBA(7-0) CBD(7-0) and
CBP Set up to CE Low
CE HIgh to R W CBA(7-0)
CBD(7-0) and CBP Hold Time
R W to LBC Setup Time
CBA to LBC Setup Time
CBD and CBP to LBC Setup Time
ACK Low to CE High Lead Time
CE Minimum Pulse Width High
CE High to CBD(7-0) and CBP TRI-STATE
ACK High to CE Low
CBD(7-0) Valid to ACK Low Setup
LBC to R W Hold Time
LBC to CBA Hold Time
LBC to CBD and CBP Hold Time
LBC to INT Low
LBC to INT High
T1
T1
T1
T1
T1
T1
a
a
a
a
a
a
(3 T2)
(4 T2)
(2 T2)
(3 T2)
(2 T2)
(3 T2)
e
80 ns and T9
Parameter
a
a
a
a
a
a
T3
T3
T6
T6
T9
T9
e
a
a
(Continued)
T10
T5
T5
e
40ns
80
Min
290
225
265
80
35
35
10
20
20
10
10
20
5
5
0
0
0
0
0
Max
540
475
515
45
60
60
45
45
45
55
55
60
Units
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