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AM79C974 Datasheet(PDF) 96 Page - Advanced Micro Devices |
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AM79C974 Datasheet(HTML) 96 Page - Advanced Micro Devices |
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96 / 153 page  AMD P R E L I M I N A R Y 96 Am79C974 AC SWITCHING CHARACTERISTICS 10BASE-T Interface Parameter Symbol Parameter Description Test Conditions Min Max Unit Transmit Timing tTETD Transmit Start of Idle 250 350 ns tTR Transmitter rise time (10% to 90%) 5.5 ns tTF Transmitter fall time (90% to 10%) 5.5 ns tTM Transmitter rise and fall time mismatch (tTM = | tTR – tTF|) 1 ns tPERLP Idle Signal Period 8 24 ms tPWLP Idle Link Pulse Width (See note below) 75 120 ns tPWPLP Predistortion Idle Link Pulse Width (See note below) 45 55 ns tJA Transmit jabber activation time 20 150 ms tJR Transmit jabber reset time 250 750 ms tJREC Transmit jabber recovery time 1.0 µs (minimum time gap between transmitted frames to prevent jabber activation) Receiving Timing tPWNRD RXD pulse width not to turn off VIN > VTHS (min) 136 ns internal carrier sense tPWROFF RXD pulse width to turn off VIN > VTHS (min) 200 ns tRETD Receive Start of Idle 200 ns Note: Not tested; parameter guaranteed by characterization. |
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