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Am79C940BVI Arkusz danych(PDF) 11 Page - Rochester Electronics

Numer części Am79C940BVI
Szczegółowy opis  Media Access Controller for Ethernet (MACE) 84-pin PLCC and 100-pin PQFP Packages
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Producent  ROCHESTER [Rochester Electronics]
Strona internetowa  http://www.rocelec.com/
Logo ROCHESTER - Rochester Electronics

Am79C940BVI Arkusz danych(HTML) 11 Page - Rochester Electronics

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79C940
Specification Number 79C940B-CI (A) Rev C
Page 11 of 13
94
AC CHARACTERISTICS (continued)
No.
Parameter
Symbol
Parameter Description
Test Conditions
Min (ns)
Max (ns)
AUI Timing
53
tDOTD
XTAL1 (externally driven) to DO± ουτπυτ
100
54
tDOTR
DO± rise time (10% to 90%)
2.5
5.0
55
tDOTF
DO± fall time (10% to 90%)
2.5
5.0
56
tDOETM
DO± rise and fall mismatch
1
57
tDOETD
DO± End of Transmit Delimiter
200
375
58
tPWRDI
DI± pulse width to reject
|input| > |VASQ|
15
59
tPWODI
DI± pulse width to turn on internal DI carrier
sense
|input| > |VASQ|
45
60
tPWMDI
DI± pulse width to maintain internal DI carrier
sense on
|input| > |VASQ|
45
136
61
tPWKDI
DI± pulse width to turn internal DI carrier
sense off
|input| > |VASQ|
200
62
tPWRCI
CI± pulse width to reject
|input| > |VASQ|
10
63
tPWOCI
CI± pulse width to turn on internal SQE sense |input| > |VASQ|
26
64
tPWMCI
CI± pulse width to maintain internal SQE
sense on
|input| > |VASQ|
26
90
65
tPWKCI
CI± pulse width to turn internal SQE sense off |input| > |VASQ|
160
66
tSQED
CI± SQE Test delay from O± inactive
|input| > |VASQ|
67
tSQEL
CI± SQE Test length
|input| > |VASQ|
79
tCLSHI
CLSN high time
tSTDC + 30
80
tTXH
TXEN or DO± hold time from CLSN↑
|input| > |VASQ|
32*tSTDC
96*tSTDC
DAI Port Timing
70
tTXEND
STDCLK↑ delay to TXEN↓
CL = 50 pF
70
72
tTXDD
STDCLK↑ delay to TXDAT± change
CL = 50 pF
70
80
tTXH
TXEN or TXDAT± hold time from CLSN↑
32*tSTDC
96*tSTDC
95
tDOTF
Mismatch in STDCLK ≠ to TXEN↓ and
TXDAT± change
15
96
tTXDTR
TXDAT± rise time
See Note 1
5
97
tTXDTF
TXDAT± fall time
See Note 1
5
98
tTXDTM
TXDAT± rise and fall mismatch
See Note 1
1
99
tTXENETD
TXEN End of Transmit Delimiter
250
350
100
tFRXDD
First RXDAT↓ delay to RXCRS↑
100
101
tLRXDD
Last RXDAT ≠ delay to RXCRS↓
120
102
tCRSCLSD
RXCRS↑ delay to CLSN↑ (TXEN = 0)
100
TABLE 5
SPECIFICATION NUMBER: 79C940-CI (A) REV -
Page 11 of 13


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