SWITCHING CHARACTERISTICS: BUS INTERFACE (CONCLUDED)
10BASE-T
Symbol
tTETD
Parameter Description
Transmit End of Transmission
Test Conditions
Min
250
136
Max
375
200
Unit
ns
tPWKRD
RX± Pulse Width Maintain/Turn Off Threshold
|VIN| > |VTHS| (Note 1)
ns
Note: RX± pulses narrower than tPWDRD (min) will maintain internal Carrier Sense on. RX± pulses wider than tPWKRD (max) will
turn internal Carrier Sense off.
t
TETD
TX±
22206B-57
Figure 54. 10 Mbps Transmit (TX±) Timing Diagram
t
t
(PWKRD)
(PWKRD)
V
TSQ+
RX±
V
TSQ-
t
PWKRD
22206B-58
Figure 55. 10 Mbps Receive (RX±) Timing Diagram
226
Am79C978