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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AM79C970A датащи(PDF) 180 Page - Advanced Micro Devices |
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AM79C970A датащи(HTML) 180 Page - Advanced Micro Devices |
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180 / 219 page  AMD P R E L I M I N A R Y 180 Am79C970A SWITCHING CHARACTERISTICS: AUI Parameter Symbol Parameter Description Test Conditions Min Max Unit AUI Port tDOTR DO+, DO– Rise Time (10% to 90%) 2.5 5.0 ns tDOTF DO+, DO– Fall Time (10% to 90%) 2.5 5.0 ns tDORM DO+, DO– Rise and Fall Time Mismatch 1.0 ns tDOETD DO ± End of Transmission 200 375 ns tPWODI DI Pulse Width Accept/Reject Threshold |VIN| > |VASQ| (Note 1) 15 45 ns tPWKDI DI Pulse Width Maintain/Turn-Off |VIN| > |VASQ| (Note 2) 136 200 ns Threshold tPWOCI CI Pulse Width Accept/Reject Threshold |VIN| > |VASQ| (Note 3) 10 26 ns tPWKCI CI Pulse Width Maintain/Turn-Off |VIN| > |VASQ| (Note 4) 90 160 ns Threshold Internal MENDEC Clock Timing tX1 XTAL1 Period VIN = External Clock 49.995 50.001 ns tX1H XTAL1 HIGH Pulse Width VIN = External Clock 20 ns tX1L XTAL1 LOW Pulse Width VIN = External Clock 20 ns tX1R XTAL1 Rise Time VIN = External Clock 5 ns tX1F XTAL1 Fall Time VIN = External Clock 5 ns Notes: 1. DI pulses narrower than t PWODI (min) will be rejected; pulses wider than tPWODI (max) will turn internal DI carrier sense on. 2. DI pulses narrower than t PWKDI (min) will maintain internal DI carrier sense on; pulses wider than tPWKDI (max) will turn internal DI carrier sense off. 3. CI pulses narrower than t PWOCI (min) will be rejected; pulses wider than tPWOCI (max) will turn internal CI carrier sense on. 4. CI pulses narrower than t PWKCI (min) will maintain internal CI carrier sense on; pulses wider than tPWKCI (max) will turn internal CI carrier sense off. |
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