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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MPC8548ECHXATHA датащи(PDF) 75 Page - Freescale Semiconductor, Inc |
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MPC8548ECHXATHA датащи(HTML) 75 Page - Freescale Semiconductor, Inc |
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75 / 151 page  MPC8548E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 9 Freescale Semiconductor 75 PCI Express VTX-DC-CM The TX DC common mode voltage 0 — 3.6 V The allowed DC common mode voltage under any conditions. See Note 6. ITX-SHORT TX short circuit current limit — — 90 mA The total current the transmitter can provide when shorted to its ground TTX-IDLE-MIN Minimum time spent in electrical idle 50 — UI Minimum time a transmitter must be in electrical idle utilized by the receiver to start looking for an electrical idle exit after successfully receiving an electrical idle ordered set TTX-IDLE-SET-TO-IDLE Maximum time to transition to a valid electrical idle after sending an electrical idle ordered set — — 20 UI After sending an electrical idle ordered set, the transmitter must meet all electrical idle specifications within this time. This is considered a debounce time for the transmitter to meet electrical idle after transitioning from L0. TTX-IDLE-TO-DIFF-DATA Maximum time to transition to valid TX specifications after leaving an electrical idle condition — — 20 UI Maximum time to meet all TX specifications when transitioning from electrical idle to sending differential data. This is considered a debounce time for the TX to meet all TX specifications after leaving electrical idle RLTX-DIFF Differential return loss 12 — — dB Measured over 50 MHz to 1.25 GHz. See Note 4. RLTX-CM Common mode return loss 6 — — dB Measured over 50 MHz to 1.25 GHz. See Note 4. ZTX-DIFF-DC DC differential TX impedance 80 100 120 TX DC differential mode low impedance ZTX-DC Transmitter DC impedance 40 — — Required TX D+ as well as D– DC impedance during all states LTX-SKEW Lane-to-lane output skew — — 500 +2UI ps Static skew between any two transmitter lanes within a single Link CTX AC coupling capacitor 75 — 200 nF All transmitters shall be AC coupled. The AC coupling is required either within the media or within the transmitting component itself. See note 8. Table 56. Differential Transmitter (TX) Output Specifications (continued) Symbol Parameter Min Nom Max Unit Comments |
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