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ADM2485BRWZ Datasheet(PDF) 5 Page - Analog Devices |
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ADM2485BRWZ Datasheet(HTML) 5 Page - Analog Devices |
5 / 20 page ADM2485 Rev. A | Page 5 of 20 TIMING SPECIFICATIONS 2.7 V ≤ VDD1 ≤ 5.5 V, 4.75 V ≤ VDD2 ≤ 5.25 V, TA = TMIN to TMAX, unless otherwise noted. Table 2. Parameter Min Typ Max Unit Test Conditions/Comments DRIVER Maximum Data Rate 16 Mbps Propagation Delay Input-to-Output tPLH, tPHL 25 45 55 ns RLDIFF = 54 Ω, CL1 = CL2 = 100 pF, see Figure 25 RTS-to-DE OUT Propagation Delay 20 35 55 ns See Figure 26 Driver Output-to-Output, tSKEW 2 5 ns RLDIFF = 54 Ω, CL1 = CL2 = 100 pF, see Figure 2 and Figure 25 Rise/Fall Time, tR, tF 5 15 ns RLDIFF = 54 Ω, CL1 = CL2 = 100 pF, see Figure 2 and Figure 25 Enable Time 43 53 ns See Figure 4 and Figure 27 Disable Time 43 55 ns See Figure 4 and Figure 27 Enable Skew, |tAZH − tBZL|, |tAZL − tBZH| 1 3 ns See Figure 4 and Figure 27 Disable Skew, |tAHZ − tBLZ|, |tALZ − tBHZ| 2 5 ns See Figure 4 and Figure 27 RECEIVER Propagation Delay, tPLH, tPHL 25 45 55 ns CL = 15 pF, see Figure 3 and Figure 28 Differential Skew, tSKEW 5 ns CL = 15 pF, see Figure 3 and Figure 28 Enable Time 3 13 ns RL = 1 kΩ, CL = 15 pF, see Figure 5 and Figure 29 Disable Time 3 13 ns RL = 1 kΩ, CL = 15 pF, see Figure 5 and Figure 29 Timing Diagrams tPHL tPLH 3V 0V VOUT B A +VOUT 0V –VOUT 1.5V 1.5V tF tR 10% POINT 10% POINT 90% POINT 90% POINT 1/2VOUT tSKEW = |tPLH – tPHL| Figure 2. Driver Propagation Delay, Rise/Fall Timing tSKEW = |tPLH – tPHL| A – B RxD 0V 0V 1.5V 1.5V tPLH tPHL VOH VOL Figure 3. Receiver Propagation Delay VOH VOH – 0.5V VOL VOH + 0.5V tLZ tZL tHZ tZH A – B A – B RTS 0.7VDD1 0.3VDD1 0.5VDD1 0.5VDD1 2.3V 2.3V 0V Figure 4. Driver Enable/Disable Timing 0.7VDD1 0.3VDD1 0.5VDD1 0.5VDD1 VOH VOL OUTPUT LOW OUTPUT HIGH tLZ tZL tHZ tZH VOH – 0.5V VOH + 0.5V 1.5V 1.5V RxD RxD RE 0V Figure 5. Receiver Enable/Disable Timing |
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