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SP3488CP Datasheet(PDF) 5 Page - Sipex Corporation |
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SP3488CP Datasheet(HTML) 5 Page - Sipex Corporation |
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5 / 9 page  5 10/16/02 SP3488/3489 Low Power Quad RS-485/422 Line Receivers © Copyright 2002 Sipex Corporation PARAMETER MIN. TYP. MAX. UNIT CONDITIONS PROPAGATION DELAY Receiver Input to Output C L = 15pF; Figure 1, 3 Low to HIGH (tPLH) 75 115 ns High to LOW (tPH L)80 115 ns Differential Receiver Skew (t SKD)4 ns Receiver Rise Time (t R) 10% to 90% SP3488 7 15 ns SP3489 7 15 ns Receiver Fall Time (t F) 90% to 10% SP3488 6 15 ns SP3489 6 15 ns RECEIVER ENABLE To Output HIGH 46 100 ns C L = 15pF; Figures 2 and 4 (S2 closed) To Output LOW 46 100 ns CL = 15pF; Figures 2 and 4 (S1 closed) RECEIVER DISABLE From Output LOW 46 100 ns CL = 15pF; Figures 2 and 4 (S1 closed) From Output HIGH 46 100 ns CL = 15pF; Figures 2 and 4 (S2 closed) cabling can be as long as 4,000 feet, RS-485 transceivers are equipped with a wide (-7V to +12V) common mode range to accomodate ground potential differences. Because the RS-485 protocol is a differential interface, data is virtually immune to noise in the transmission line. Receiver... The SP3488 and the SP3489 receivers have differential inputs with an input sensitivity as low as +100mV. Input impedance of the receivers is typically 15K Ω (12KΩ minimum). A wide common mode range of -7V to +12V allows for large ground potential differences between systems. The SP3488 features active HIGH and active LOW common receiver enable controls. Refer to SP3488 Truth Table in Table 1. The SP3489 provides independent, active high receiver enable controls for each pair of receivers. Refer to SP3489 Truth Table in Table 2. Both devices feature tri-state outputs and a -7V to +12V common-mode input range permitting a +7V ground difference between devices on the communication bus. The SP3488 and the SP3489 are equipped with a fail-safe feature which forces a logic HIGH at the receiver output when the input is left floating. The SP3488 and SP3489 receivers meet the electrical specifications of RS-485 and RS-422 serial protocol data rates up to 10Mbps under load. AC PARAMETERS V CC = +3.3V±5%; typicals at 25°C; TAMB = 25°C unless otherwise noted. |
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