SMSC LAN91C111 - Manual (Page 118)

10/100 Non-PCI Ethernet Single Chip MAC + PHY
Datasheet
Revision 1.91 (08-18-08) 118 SMSC LAN91C111 REV C
DATASHEET
AC TEST TIMING CONDITIONS
Unless otherwise noted, all test conditions are as follows:
1. V DD = 3.3V +/-5%
2. RBIAS = 11K +/- 1%, no load
3. Measurement Points:
4. TPO±, TPI±: 0.0 V During Data, ±0.3V at start/end of packet
5. All other inputs and outputs: 1.4 Volts
Table 14.1 Transmit Timing Characteristics
SYM PARAMETER
LIMIT
UNIT CONDITIONS
MIN TYP MAX
t30 Transmit Propagation Delay 60 140 nS 100Mbps
600 nS 10Mbps
t31 Transmit Output Jitter ±0.7 nS pk-pk 100Mbps
±5.5 nS pk-pk 10Mbps
t32 Transmit SOI Pulse Width to
0.3V 250 nS 10Mbps
t33 Transmit SOI Pulse Width to
40mV 4500 nS 10Mbps
t34 LEDn Delay Time 25 mS
t35 LEDn Pulse Width 80 105 mS
Figure 14.11 Transmit Timing
LEDn
TPO±
t34
t30
t35
SOI
t31
TXEN Bit is Set
t33
t32
PREAMBLE PREAMBLE DATA DATA
TPO±
t 30
/J/K/ IDLE /T/R/
t
31
DATA IDLE IDLE
FXO±
100Mbps
10Mbps