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LTC2870 Datasheet(PDF) 4 Page - Linear Technology |
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LTC2870 Datasheet(HTML) 4 Page - Linear Technology |
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4 / 36 page  LTC2870/LTC2871 4 28701f ELECTRICAL CHARACTERISTICS 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 = 0V, LB = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Power Supply VCC Supply Voltage Operating Range 3 5.5 V VL Logic Supply Voltage Operating Range VL ≤ VCC 1.7 VCC V VCC Supply Current in Shutdown Mode RXEN = VL, DXEN = TE485 = FEN = 0V, (LTC2870) DX485 = DX232 = TE485 = FEN = H/F = 0V, RX485 = RX232 = VL (LTC2871) l 860 μA VCC Supply Current in Transceiver Mode (Outputs Unloaded) (Note 3) 485/232 = DXEN = VL, RXEN = 0V, DY/DZ = 0V or VL (LTC2870) DX485 = DX232 = VL, RX485 = RX232 = 0V, DI/DIN1/DIN2 = 0V or VL (LTC2871) 3.3 mA VL Supply Current in Transceiver Mode (Outputs Unloaded) l 05 μA RS485 Driver |VOD| Differential Output Voltage RL = ∞, VCC = 3V (Figure 1) RL = 27Ω, VCC = 3V (Figure 1) RL = 50Ω, VCC = 3.13V (Figure 1) l l l 1.5 1.5 2 6 VCC VCC V V V Δ|VOD| Difference in Magnitude of Differential Output Voltage for Complementary Output States RL = 27Ω, VCC = 3V (Figure 1) RL = 50Ω, VCC = 3.13V (Figure 1) l l 0.2 0.2 V V VOC Common Mode Output Voltage RL = 27Ω or 50Ω (Figure 1) l 3V Δ|VOC| Difference in Magnitude of Common Mode Output Voltage for Complementary Output States RL = 27Ω or 50Ω (Figure 1) l 0.2 V IOZD485 Three-State (High Impedance) Output Current VOUT = 12V or –7V, VCC = 0V or 3.3V (Figure 2) l –100 125 μA IOSD485 Maximum Short-Circuit Current –7V ≤ VOUT ≤ 12V (Figure 2) l –250 250 mA RS485 Receiver IIN485 Input Current VIN = 12V or –7V, VCC = 0V or 3.3V (Figure 3) (Note 5) l –100 125 μA RIN485 Input Resistance VIN = 12V or –7V, VCC = 0V or 3.3V (Figure 3) (Note 5) l 96 125 kΩ Differential Input Signal Threshold Voltage (A-B) –7V ≤ (A or B) ≤ 12V (Note 5) l ±200 mV Input Hysteresis B = 0V (Notes 3, 5) 130 mV Differential Input Failsafe Threshold Voltage –7V ≤ (A or B) ≤ 12V (Note 5) l –200 –50 0 mV Input DC Failsafe Hysteresis B = 0V (Note 5) 25 mV VOL Output Low Voltage Output Low, I(RA, RO) = 3mA (Sinking), 3V ≤ VL ≤ 5.5V l 0.4 V Output Low, I(RA, RO) = 1mA (Sinking), 1.7V ≤ VL < 3V l 0.4 V VOH Output High Voltage Output High, I(RA, RO) = –3mA (Sourcing), 3V ≤ VL ≤ 5.5V l VL – 0.4 V Output High, I(RA, RO) = –1mA (Sourcing), 1.7V ≤ VL < 3V l VL – 0.4 V Three-State (High Impedance) Output Current 0V ≤ (RA, RO), ≤VL, VL = 5.5V l 0±5 μA Short-Circuit Output Current 0V ≤ (RA, RO), ≤VL, VL = 5.5V l ±125 mA |
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Similar Description - LTC2870 |
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