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SP488ECT 数据表(PDF) 4 Page - Sipex Corporation |
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SP488ECT 数据表(HTML) 4 Page - Sipex Corporation |
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4 / 10 page  4 SP488E/489EDS/07 SP488E/489E Enhanced Quad RS-485/RS-422 Line Receivers © Copyright 2000 Sipex Corporation Pin 13 — RO 4 — Receiver 4 Output — If Receiver 4 output is enabled, if RI 4A > RI4B by 200mV, Receiver 4 output is high. If Receiver 4 output is enabled, and if RI 4A < RI4B by 200mV, Receiver 4 output is low. Pin 14 — RI 4A — Receiver 4 input A. Pin 15 — RI 4B — Receiver 4 input B. Pin 16 — Supply Voltage V CC — 4.75V ≤ VCC ≤ 5.25V. SP489E PINOUT Pin 1 — RI 1B — Receiver 1 input B. Pin 2 — RI 1A — Receiver 1 input A. Pin 3 — RO 1 — Receiver 1 Output — If Receiver 1 output is enabled, if RI 1A > RI1B by 200mV, Receiver output is high. If Receiver 1 output is enabled, and if RI 1A < RI1B by 200mV, Receiver 1 output is low. Pin 4 — EN1/EN2 — Receiver 1 and 2 Output Enable. Please refer to SP489E Truth Table (2). Pin 5 — RO 2 — Receiver 2 Output — If Receiver 2 output is enabled, if RI 2A > RI2B by 200mV, Receiver 2 output is high. If Receiver 2 output is enabled, and if RI 2A < RI2B by 200mV, Receiver 2 output is low. Pin 6 — RI 2A — Receiver 2 input A. Pin 7 — RI 2B — Receiver 2 input B. Pin 8 — GND — Digital Ground. DIFFERENTIAL ENABLES OUTPUT A – B EN EN RO V ID ≥ 0.2V H X H XL H –0.2V < V ID < +0.2V H X X XL X V ID ≤ 0.2V H X L XL L X L H Hi–Z Table 1. SP488E Truth Table Pin 9 — RI 3B — Receiver 3 input B. Pin 10 — RI 3A — Receiver 3 input A. Pin 11 — RO 3 — Receiver 3 Output — If Receiver 3 output is enabled, if RI 3A > RI3B by 200mV, Receiver 3 output is high. If Receiver 3 output is enabled, and if RI 3A < RI3B by 200mV, Receiver 3 output is low. Pin 12 — EN3/EN4 — Receiver 3 and 4 Output Enable. Please refer to SP489E Truth Table (2). Pin 13 — RO 4 — Receiver 4 Output — If Receiver 4 output is enabled, if RI 4A > RI4B by 200mV, Receiver 4 output is high. If Receiver 4 output is enabled, and if RI 4A < RI4B by 200mV, Receiver 4 output is low. Pin 14 — RI 4A — Receiver 4 input A. Pin 15 — RI 4B — Receiver 4 input B. Pin 16 — Supply Voltage V CC — 4.75V ≤ VCC ≤ 5.25V. Table 2. SP489E Truth Table DIFFERENTIAL ENABLES OUTPUT A – B EN1/EN2 or EN3/EN4 RO VID ≥ 0.2V H H –0.2V < VID < +0.2V H X VID ≤ 0.2V H L X L Hi–Z FEATURES… The SP488E and SP489E are low–power quad differential line receivers meeting RS-485 and RS-422 standards. The SP488E features active high and active low common receiver enable controls; the SP489E provides independent, active high receiver enable controls for each pair of receivers. Both feature tri–state outputs and a -7V to +12V common–mode input range permitting a +7V ground difference between devices on the communications bus. The SP488E/489E are equipped with a fail–safe feature which forces a logic high at the receiver output when the input is left floating. Data rates up to 10Mbps are supported. Both are available in 16-pin plastic DIP and SOIC packages. |
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