80220 Datasheet, PDF (59/91 Pages) LSI Computer Systems – 100BASE-TX/10BASE-T Ethernet Media Interface Adapter

80220/80221
AC TEST TIMING CONDITIONS
Unless otherwise noted, all test conditions are as follows:
1. T_A= 0 to +70°C
2. V_CC = 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.
SYM
t
1
t₂
t
3
t
4
PARAMETER
OSCIN Period
OSCIN High Time
OSCIN Low Time
OSCIN to TX_CLK
Delay
LIMIT
MIN TYP
39.996 40
16
16
MAX
40.004
10
20
UNIT
nS
nS
nS
nS
nS
CONDITIONS
Clock Applied to OSCIN
Clock Applied to OSCIN
Clock Applied to OSCIN
100 Mbps
10 Mbps
OSCIN
TX_CLK
(100 MB)
TX_CLK
(10 MB)
MD400159/E
t1
t2
t3
t4
t4
t4
Figure 16. 25 Mhz Output Timing
45-599