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ST485ABDR Datasheet(PDF) 3 Page - STMicroelectronics |
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ST485ABDR Datasheet(HTML) 3 Page - STMicroelectronics |
3 / 19 page ST485AB Pin configuration 3/19 1 Pin configuration Figure 1. Pin configuration Table 2. Pin description Pin n° Symbol Name and function 1 RO Receiver output. If A>B by 200 mV, RO will be high; if A<B by 200 mV, RO will be low 2RE Receiver output enable. RO is enabled when RE is low; RO is high impedance when RE is high. If RE is high and DE is low, the device will enter a low power shutdown mode. 3DE Driver output enable. The driver outputs are enabled by bringing DE high. They are high impedance when DE is low. If RE is high DE is low, the device will enter a low-power shutdown mode. If the driver outputs are enabled, the part functions as line driver, while they are high impedance, it functions as line receivers if RE is low. 4DI Driver input. A low on DI forces output A low and output B high. Similarly, a high on DI forces output A high and output B low 5 GND Ground 6 A Non-inverting receiver input and non-inverting driver output 7 B Inverting receiver input and inverting driver output 8VCC Supply voltage: VCC= 4.75 V to 5.25 V |
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