LXT972 Level One, LXT972 Datasheet - Page 44

• Manufacturer Part Number: LXT972
• Description: 3.3V Dual-Speed Fast Ethernet Transceiver Datasheet
• Manufacturer: Level One

LXT972 3.3V Dual-Speed Fast Ethernet Transceiver
Figure 27: 10BASE-T Jabber and Unjabber Timing
Table 29: 10BASE-T Jabber and Unjabber Timing Parameters
Figure 28: 10BASE-T SQE (Heartbeat) Timing
Table 30: 10BASE-T SQE Timing Parameters
44
Maximum transmit time
Unjab time
COL (SQE) Delay after TX_EN off
COL (SQE) Pulse duration
1. Typical values are at 25 °C and are for design aid only; not guaranteed and not subject to production testing.
1. Typical values are at 25 °C and are for design aid only; not guaranteed and not subject to production testing.
T X _ E N
T X _ C L K
C O L
T X D
T X _ E N
Parameter
C O L
Parameter
Sym
t1
t2
t
1
Min
250
20
Sym
t1
t2
t
1
Min
0.65
0.5
Typ
–
–
1
Typ
–
–
1
Max
150
750
t
Max
2
1.6
1.5
Units
us
us
Units
ms
ms
t
2
Test Conditions
Test Conditions
–
–
–
–