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AM79C978VC/W Arkusz danych(PDF) 225 Page - Advanced Micro Devices

Numer części AM79C978VC/W
Szczegółowy opis  Single-Chip 1/10 Mbps PCI Home Networking Controller
PDF  261 Pages
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Producent  AMD [Advanced Micro Devices]
Strona internetowa  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM79C978VC/W Arkusz danych(HTML) 225 Page - Advanced Micro Devices

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Am79C978
225
SWITCHING CHARACTERISTICS: BUS INTERFACE (CONTINUED)
External Clock (XTAL) Timing Specifications
External Clock (Oscillator) Timing Specification
Figure 52.
Clock Timing
PMD Interface
PECL
Note:
1. Not included in the production test.
Figure 53.
PMD Interface Timing (PECL)
Clock Timing
No.
Symbol
Parameter Description
Min
Max
Unit
1tPER
Cycle time
49.995
50.005
ns
2tPWH
Cycle high time
0.4* Tcycle
0.6*Tcycle
ns
3tPWL
Clock low time
0.4*Tcycle
0.6*Tcycle
ns
Clock Timing
No.
Symbol
Parameter Description
Min
Max
Unit
1tPER
Cycle time
16.665
16.669
ns
2tPWH
Cycle high time
0.4* Tcycle
0.6*Tcycle
ns
3tPWL
Clock low time
0.4*Tcycle
0.6*Tcycle
ns
XCLK
1
3
2
22206B-55
No.
Symbol
Parameter Description
Test Conditions
Min
Max
Unit
160
tR (Note 1) TX+, TX- Rise Time
PECL Load
0.5
3
ns
161
tF (Note 1) TX+, TX- Fall Time
PECL Load
0.5
3
ns
162
tSK (Note 1) TX+ to TX- skew
PECL Load
--
+200
ps
163
tS
SDI setup time to XCLK high
--
7
--
ns
164
tH
SDI hold time to XCLK high
--
5
--
ns
TX+,TX–
TX+
TX–
162
161
80%
20%
160
22206B-56



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