mc68160a Freescale Semiconductor, Inc, mc68160a Datasheet - Page 18

• Manufacturer Part Number: mc68160a
• Description: Enhanced Ethernet Interface Circuit
• 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.
TPTX Common Mode AC Output Voltage (Note 3)
TX to TPTX Steady State Propagation Delay (Note 2) (See Figure 24)
TENA Assert to RENA Assert Delay (Note 7) (See Figure 24)
Internal Loopback Delay from TX to RX (Note 7) (See Figure 24)
TPTX End of Packet Hold Time from last positive TPTX Signal Edge to
TPTX Precompensation Pulse Width (Notes 2 and 6) (See Figure 25)
RENA Deassert Delay from TENA Deassert when Receiver is inactive
TPTX Data–to–Link Test Pulse (Note 2) (See Figure 27)
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 25)
Motorola Mode
Fujitsu Mode
National Mode
Intel Mode (Note 4) (See Figure 26)
39
39
2. Measured differentially across the output of Test Load D shown in Figure 23 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 21.
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 20. Test Load A
Figure 22. 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.
Freescale Semiconductor, Inc.
For More Information On This Pro
47.5
47.5
100 H
per driver output is required for proper series line termination.
100
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49.9
V OUT
MC68160A
V CM
external resistors shown in Figures 20 to 23,
V OCMTP
Symbol
t 130
t 131
t 132
t 133
t 134
t 135
t 136
t 137
t 137
t 137
t 138
t 139
t 140
t 141
t 142
Device
Figure 21. Test Load B
Figure 23. Test Load D
Min
250
250
250
250
250
8.0
8.0
98
48
80
80
39
39
–
–
–
–
–
OROLA ANALOG IC DEVICE DATA
39
39
45–58
Typ
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
200 H
100
100
Max
200
102
400
650
400
450
450
450
450
240
240
50
52
24
24
–
mVrms
V OUT
Unit
ms
ms
ns
ns
ns
ns
ns
ns
ns
ns