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SP485EN Datasheet(PDF) 4 Page - Sipex Corporation |
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SP485EN Datasheet(HTML) 4 Page - Sipex Corporation |
4 / 10 page 4 Rev. 07/16/02 SP481/483/485 Low Power Half-Duplex RS485 Transceivers © Copyright 2002 Sipex Corporation PIN FUNCTION Pin# Name Description 1 RO Receiver Output. 2 RE Receiver Output Enable Active LOW. 3 DE Driver Output Enable Active HIGH. 4 DI Driver Input. 5 GND Ground Connection. 6 A Driver Output/Receiver Input Non-inverting. 7 B Driver Output/Receiver Input Inverting. 8 Vcc Positive Supply 4.75V<Vcc< 5.25V. SP481, SP483, SP485 Pinout (Top View) RO 1 RE 2 DE 3 DI 4 8 VCC 7 B 6 A 5 GND D R SP485 Top View SP483 AC SPECIFICATIONS T MIN to TMAX and VCC = 5V ± 5% unless otherwise noted. PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS SP483 DRIVER AC Characteristics Maximum Data Rate 250 kbps Driver Input to Output 250 800 2000 ns t PLH; RDIFF = 54Ω, CL1 = CL2 = 100pF; see figures 3 & 6 Driver Skew 250 800 2000 ns t PHL; RDIFF = 54Ω, CL1 = CL2 = 100pF; see figures 3 & 6 Driver Rise and Fall Time 100 800 ns see figures 3 & 6, t SKEW = |tDPLH - tDPHL| 250 2000 ns From 10% to 90%; R DIFF = 54Ω, C L1 = CL2 = 100pF, see figures 3 & 6 Driver Enable to Output High 250 2000 ns C L = 100pF; See figures 4 & 7; S2 closed Driver Enable to Output Low 250 2000 ns C L = 100pF; See figures 4 & 7; S1 closed Driver Disable Time from Low 300 3000 ns C L = 15pF; See figures 4 & 7; S1 closed Driver Disable Time from High 300 3000 ns C L = 15pF; See figures 4 & 7; S2 closed SP483 RECEIVER AC Characteristics Maximum Data Rate 250 kbps Receiver Input to Output 250 2000 ns t PLH; RDIFF = 54Ω, CL1 = CL2 = 100pF; Figures 3 & 8 Diff. Receiver Skew It PLH-tPHLI 100 ns R DIFF = 54Ω, CL1 = CL2 = 100pF; Figures 3 & 8 Receiver Enable to Output Low 20 50 ns C RL = 15pF; Figures 2 & 9; S1 closed Receiver Enable to Output High 20 50 ns C RL = 15pF; Figures 2 & 9; S2 closed Receiver Disable from Low 20 50 ns C RL = 15pF; Figures 2 & 9; S1 closed Receiver Disable from High 20 50 ns C RL = 15pF; Figures 2 & 9; S2 closed SP483 Shutdown Timing Time to Shutdown 50 200 600 ns RE = 5V, DE = 0V Driver Enable from Shutdown to Output High 2000 ns C L = 100pF; See figures 4 & 7; S2 closed Driver Enable from Shutdown to Output Low 2000 ns C L = 100pF; See figures 4 & 7; S1 closed Receiver Enable from Shutdown to Output High 2500 ns C L = 15pF; See figures 4 & 7; S2 closed Receiver Enable from Shutdown to Output Low 2500 ns C L = 15pF; See figures 4 & 7; S1 closed |
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