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LTC2801 数据表(PDF) 5 Page - Analog Devices |
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LTC2801 数据表(HTML) 5 Page - Analog Devices |
5 / 32 page LTC2873 5 REV B For more information www.analog.com SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS RS485 Switching Characteristics Maximum Data Rate (Note 3) (Figure 15) l 20 Mbps tPLHD485, tPHLD485 Driver Propagation Delay RDIFF = 54Ω, CL = 100pF (Figure 4) l 20 70 ns Driver Propagation Delay Difference RDIFF = 54Ω, CL = 100pF (Figure 4) tPLHD485 – tPHLD485 l 0 ±6 ns tSKEWD485 Driver Skew (A/DO to B/RI) RDIFF = 54Ω, CL = 100pF (Figure 4) 0 ±8 ns tRD485, tFD485 Driver Rise or Fall Time RDIFF = 54Ω, CL = 100pF (Figure 4) 7.5 12.5 ns tZLD485, tZHD485, tLZD485, tHZD485 Driver Output Enable or Disable Time SHDN = VL, RL = 500Ω, CL = 50pF, DE485 ↑ and ↓ (Figure 5) l 120 ns tZHSD485, tZLSD485 Driver Enable from Shutdown Time (Note 7) DE485/F232 = VL, RL = 500Ω, CL = 50pF, SHDN ↑ (Figure 5) l 4 12 µs tHZSD485, tLZSD485 Driver Output Disable Into Shutdown Time DE485/F232 = VL, RL = 500Ω, CL = 50pF, SHDN ↓ (Figure 5) l 0.5 1 μs tPLHR485, tPHLR485 Receiver Input to Output Time CL = 15pF, VCM = 1.5V, |A/DO to B/RI| = 1.5V, (Figure 6) l 45 85 ns tSKEWR485 Differential Receiver Skew tPLHR485 – tPHLR485 CL = 15pF (Figure 6) l 0 ±9 ns tRR485, tFR485 Receiver Output Rise or Fall Time CL = 15pF (Figure 6) l 3 15 ns tZLR485, tZHR485, tLZR485, tHZR485 Receiver Output Enable or Disable Time 485/232 = SHDN = VL, RL = 1kΩ, CL = 15pF, RE485 ↓ and ↑ (Figure 7) l 12 85 ns tZHSR485, tZLSR485 Receiver Enable from Shutdown Time (Note 7) 485/232 = VL , RE485 = 0V, RL = 1kΩ, CL = 15pF , SHDN ↑ (Figure 7) l 4 12 µs tHZSR485, tLZSR485 Receiver Output Disable Into Shutdown Time 485/232 = VL, RE485 = 0V, RL = 1kΩ, CL = 15pF ,SHDN ↓ (Figure 7) l 0.5 1 µs tRTEN485, tRTZ485 Termination Enable or Disable Time 485/232 = VL, SHDN = VL, B = 0, (A/DO to B/RI) = 2V (Figure 8) l 100 µs RS232 Switching Characteristics Maximum Data Rate (Figure 15) RL = 3kΩ, CL = 2.5nF, (Fast, Slow Modes) RL = 3kΩ, CL = 1nF, (Fast, Slow Modes) RL = 3kΩ, CL = 0.25nF, (Fast Mode) l l l 100 250 1000 kbps kbps kbps Driver Slew Rate (Figure 9) RL = 3kΩ, CL = 2.5nF, (Fast, Slow Modes) RL = 3kΩ, CL = 50pF, (Slow Mode) RL = 3kΩ, CL = 50pF, (Fast Mode) l l l 2 30 150 V/µs V/µs V/µs tPHLD232, tPLHD232 Driver Propagation Delay (Figure 9) RL = 3kΩ, CL = 50pF, (Slow Mode) RL = 3kΩ, CL = 50pF, (Fast Mode) l l 1.5 0.4 3 1 µs µs tSKEWD232 Driver Skew (Figure 9) RL = 3kΩ, CL = 50pF, (Slow Mode) RL = 3kΩ, CL = 50pF, (Fast Mode) 0 0 ±400 ±100 ns ns tZLSD232, tZHSD232 Driver Enable from Shutdown Time (Figure 7) VDD = 7.0V, VEE = –6.3V, 485/232 = 0V, RL = 3kΩ, CL = 50pF, SHDN ↑ (Figure 10) l 5 12 µs tLZSD232, tHZSD232 Driver Output Disable into Shutdown Time 485/232 = 0V, RL = 3kΩ, CL = 50pF, SHDN ↓ (Figure 10) l 0.6 2 µs tPHLR232, tPLHR232 Receiver Propagation Delay CL = 150pF (Figure 11) l 60 200 ns tSKEWR232 Receiver Skew CL = 150pF (Figure 11) 25 ns tRR232, tFR232 Receiver Output Rise or Fall Time CL = 150pF (Figure 11) l 70 200 ns The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = VL = 3.3V, TE485 = VL, LB = 0V unless otherwise noted. (Notes 2, 6) SWITCHING CHARACTERISTICS |
类似零件编号 - LTC2801 |
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类似说明 - LTC2801 |
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