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ENC28J60-C/ML 数据表(PDF) 83 Page - Microchip Technology |
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ENC28J60-C/ML 数据表(HTML) 83 Page - Microchip Technology |
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83 / 96 page  © 2006 Microchip Technology Inc. Preliminary DS39662B-page 81 ENC28J60 TABLE 16-1: AC CHARACTERISTICS: ENC28J60 (INDUSTRIAL AND COMMERCIAL) TABLE 16-2: OSCILLATOR TIMING CHARACTERISTICS TABLE 16-3: RESET AC CHARACTERISTICS TABLE 16-4: CLKOUT PIN AC CHARACTERISTICS TABLE 16-5: REQUIREMENTS FOR EXTERNAL MAGNETICS AC CHARACTERISTICS Standard Operating Conditions -40°C ≤ TA ≤ +85°C, 3.10V ≤ VDD ≤ 3.60V (Industrial) 0°C ≤ TA ≤ +70°C, 3.10V ≤ VDD ≤ 3.60V (Commercial) Param. No. Sym Characteristic Min Max Units Conditions FOSC Clock In Frequency 25 25 MHz TOSC Clock In Period 40 40 ns TDUTY Duty Cycle (external clock input) 40 60 % Δf Clock Tolerance — ±50 ppm Param. No. Sym Characteristic Min Max Units Conditions trl RESET Pin High Time (between Reset events) 2— μs tRSTLOW RESET Pin Low Time to trigger Reset 400 — ns Param. No. Sym Characteristic Min Max Units Conditions thCLKOUT CLKOUT Pin High Time 16.5 — ns TDUTY = 50% (Note 1) tlCLKOUT CLKOUT Pin Low Time 16.5 — ns TDUTY = 50% (Note 1) trCLKOUT CLKOUT Pin Rise Time — 3 ns Measured from 0.1 VDD to 0.9 VDD, Load = 10 pF (Note 1) tfCLKOUT CLKOUT Pin Fall Time — 4 ns Measured from 0.9 VDD to 0.1 VDD, Load = 10 pF (Note 1) Note 1: CLKOUT prescaler is set to divide by one. Parameter Min Norm Max Units Conditions RX Transformer Turns Ratio — 1:1 — — TX Transformer Turns Ratio — 1:1 — — Transformer Center Tap = 3.3V Insertion Loss 0.0 0.6 1.1 dB Primary Inductance 350 — — μH 8 mA bias Transformer Isolation — 1.5 — kV Differential to Common Mode Rejection 40 — — dB 0.1 to 10 MHz Return Loss -16 — — dB |
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