mc68160b Freescale Semiconductor, Inc, mc68160b Datasheet - Page 15

• Manufacturer Part Number: mc68160b
• Description: Enhanced Ethernet Transceiver
• Manufacturer: Freescale Semiconductor, Inc

TP TRANSMIT SWITCHING
NOTES: 1. Measured differentially across the output of Test Load A which is connected directly to the TPTX+/– pins of the device.
MOTOROLA ANALOG IC DEVICE DATA
TPTX Common Mode AC Output Voltage (Note 3)
TX to TPTX Steady State Propagation Delay (Note 2) (See Figure 17)
TENA Assert to RENA Assert Delay (Note 7) (See Figure 17)
Internal Loopback Delay from TX to RX (Note 7) (See Figure 17)
TPTX End of Packet Hold Time from last positive TPTX Signal Edge to
TPTX Precompensation Pulse Width (Notes 2 and 6) (See Figure 18)
RENA Deassert Delay from TENA Deassert when Receiver is inactive
TPTX Data–to–Link Test Pulse (Note 2) (See Figure 20)
TPTX Link Test Pulse Width (Note 2)
TPTX Link Test Pulse Decay–to–Idle Condition (Note 1)
TPTX Link Test Pulse to next Link Test Pulse (Note 2)
Bit Duration Center–to–Center
Half–Bit Cell Duration Center–to–Boundary
+585 mV Differential Output Level (Note 5) (See Figure 18)
Motorola Mode
39
39
2. Measured differentially across the output of Test Load D shown in Figure 16 which is connected directly to the TPTX+/– pins of the device.
3. Measured across the output of Test Load C which is connected directly to the TPTX+/– pins of the device.
4. Same as t 137 except the logic states for TENA and RENA are inverted.
5. Measured across the output of Test Load B shown in Figure 14.
6. Measured at the +/–90% points of the precompensation voltage feature of the waveform. (The 0% reference is 0 V differential.)
7. Load on specified output is 20 pF to ground.
39
39
100pF
Figure 13. Test Load A
Figure 15. Test Load C
1.0 H
1.0 H
200 H
NOTE: A total of 50
Characteristic
100pF
V out
This is realized with the 39
together with the internal driver output resistance.
47.5
47.5
100 H
per driver output is required for proper series line termination.
100
49.9
V OUT
MC68160B
V CM
external resistors shown in Figures 13 to 16,
V OCMTP
Symbol
t 130
t 131
t 132
t 133
t 134
t 135
t 136
t 137
t 139
t 140
t 141
t 142
Device
Figure 14. Test Load B
Figure 16. Test Load D
Min
250
250
8.0
8.0
98
48
80
80
39
39
–
–
–
–
–
39
39
38–58
Typ
–
–
–
–
–
–
–
–
–
–
–
–
200 H
100
100
Max
200
102
400
650
400
500
240
240
50
52
24
24
–
mVrms
V OUT
Unit
ms
ms
ns
ns
ns
ns
ns
ns
ns
ns
15