LAN8670/1

7.6.9.1 10BASE-T1S PMA Transmitter Characteristics

Table 7-17. 10BASE-T1S PMA Transmitter Electrical Characteristics
Parameter	Symbol	Min	Typ	Max	Units	Additional Information
Differential driver output	V_od	0.8	1.0	1.2	V_pp	Figure 7-9
Cycle-to-cycle jitter	t_j(c-c)		0.65	1.2	ns	Note 1 Figure 7-9
Rise time, Fall time (20%-80%)	t_rtx, t_ftx	7.9		14.75	ns	Note 1 Figure 7-10
Droop		0		13	%	Note 1 Figure 7-9
Note: C = Characterized on samples

Figure 7-9. Differential Output Test Fixture

Figure 7-10. Transmitter Output Rise/Fall Test Fixture

Power spectral density was measured in a multidrop configuration (50 Ω termination) as shown in Figure 7-9 with the transmitter in the IEEE Transmitter PSD mask test mode 3. The upper and lower limits shown are as proposed by the OPEN Alliance 10BASE‑T1S System Implementation Specification, Version 1.0.

Figure 7-11. Transmitter Power Spectral Density (Typical)

Topology Discovery - Rev D0

The following section describes the Topology Discovery timing and behavior for devices using silicon revision D0 and later.

Figure 7-12. Topology Discovery Signal Characteristics - Rev D0

Table 7-18. Signal Characteristics during Topology Discovery - Rev D0
Parameter	Symbol	Min	Typ	Max	Units	Additional Information
Topology Discovery Pulse width Maximum	t_{td_width_max}	40	80	91	ns	Note 1
Topology Discovery Pulse width Minimum	t_{td_width_min}	77	84	92	ns	Note 1
Internal loopback delay	t_{tot_delay_int}	125	170	260	ns	Note 1
Note: C = Characterized on samples

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