參數資料
型號: LQ80221
英文描述: LAN Transceiver
中文描述: 網絡收發(fā)器
文件頁數: 59/91頁
文件大小: 907K
代理商: LQ80221
80220/80221
4-59
MD400159/E
AC TEST TIMING CONDITIONS
Unless otherwise noted, all test conditions are as follows:
1. T
A
= 0 to +70
°
C
2. V
= 5V +/-5%
3. 25 MHz +/- 0.01%
4. REXT = 10K +/- 1%, no load
5. Input conditions:
All Inputs:
6. Output Loading
TPO
±
:
Open Drain Outputs:
All Other Digital Outputs:
7. Measurement Points:
TPO
±
, TPI
±
:
All other inputs and outputs:
tr,tf<=10nS, 20-80%
Same as Figure 11 or equivalent, 10pF
1K Pullup, 50pF
25pF
0.0 V During Data,
±
0.3V at start/end of packet
1.5 Volts
25 Mhz INPUT / OUTPUT CLOCK TIMING CHARACTERISTICS
Refer to Figure 16 for Timing Diagram.
LIMIT
TYP
40
SYM
t
1
t
2
t
3
t
4
PARAMETER
OSCIN Period
OSCIN High Time
OSCIN Low Time
OSCIN to TX_CLK
Delay
MIN
39.996
16
16
MAX
40.004
UNIT
nS
nS
nS
nS
nS
CONDITIONS
Clock Applied to OSCIN
Clock Applied to OSCIN
Clock Applied to OSCIN
100 Mbps
10 Mbps
10
20
Figure 16. 25 Mhz Output Timing
TX_CLK
(100 MB)
TX_CLK
(10 MB)
t4
t4
t4
OSCIN
t1
t2
t3
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