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SP1485ECP 数据表(PDF) 5 Page - Sipex Corporation |
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SP1485ECP 数据表(HTML) 5 Page - Sipex Corporation |
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5 / 11 page ![]() 5 Rev:C Date: 02/26/04 SP1485E Low Power Half-Duplex RS485 Transceivers © Copyright 2004 Sipex Corporation INPUTS OUTPUTS LINE RE DE DI CONDITION B A X1 1 No Fault 0 1 X1 0 No Fault 1 0 X0 X X ZZ X1 X Fault Z Z INPUTS OUTPUTS RE DE A - B R 00 +0.2V 1 00 -0.2V 0 00 Inputs Open 1 10 X Z Table 1. Transmit Function Truth Table Table 2. Receive Function Truth Table +3V 0V DE 5V VOL A, B 0V 1.5V 1.5V tZL tZH f = 1MHz; tR < 1.0ns; tF < 1.0ns VOH A, B 2.3V 2.3V tLZ tHZ 0.5V 0.5V Output normally LOW Output normally HIGH +3V 0V RE 5V R 0V 1.5V 1.5V tZL tZH f = 1MHz; tR < 1.0ns; tF < 1.0ns R 1.5V 1.5V tLZ tHZ 0.5V 0.5V Output normally LOW Output normally HIGH VIL VIH Figure 8. Receiver Enable and Disable Times Figure 7. Receiver Propagation Delays Figure 6. Driver Enable and Disable Times VOH VOL R 1.5V 1.5V tPHL f = 1MHz; tR < 1.0ns; tF < 1.0ns OUTPUT V0D2+ V0D2– A – B 0V 0V tPLH INPUT tSKEW = | tPHL - tPLH | |
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