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AM26LS31MFK Datasheet(PDF) 9 Page - Texas Instruments |
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AM26LS31MFK Datasheet(HTML) 9 Page - Texas Instruments |
9 / 28 page 1Z 1Y G G 1A 4 12 1 2 3 2Z 2Y 2A 7 6 5 3Z 3Y 3A 9 10 11 4Z 4Y 4A 15 14 13 Copyright © 2016, Texas Instruments Incorporated 9 AM26LS31, AM26LS31C, AM26LS31I, AM26LS31M www.ti.com SLLS114K – JANUARY 1979 – REVISED JULY 2016 Product Folder Links: AM26LS31 AM26LS31M Submit Documentation Feedback Copyright © 1979–2016, Texas Instruments Incorporated 8 Detailed Description 8.1 Overview The AM26LS31x differential bus transmitter is a monolithic integrated circuit designed for unidirectional data communication on transmission lines. It is designed for balanced transmission lines and meets ANSI Standard EIA/TIA-422-B and ITU Recommendation V.11. The AM26LS31x has a four 3-state differential line drivers that operate from a single 5-V power supply. The driver also integrates active-high and active-low enables for precise device control. The driver is designed to handle loads of a minimum of ±30 mA of sink or source current. The driver features positive- and negative-current limiting for protection from line fault conditions. 8.2 Functional Block Diagram 8.3 Feature Description 8.3.1 Complementary Output-Enable Inputs The AM26LS31x can be configured using the G and G logic inputs to control transmitter outputs. Setting either G to a logic HIGH or G to an logic LOW enables the transmitter outputs. If G is set to logic LOW and G is set to logic HIGH, the transmitter outputs are disabled. See Table 1 for a complete truth table. 8.3.2 High Output Impedance in Power-Off Conditions When the AM26LS31x transmitter outputs are disabled using G and G, the outputs are set to a high impedance state. 8.3.3 Complementary Outputs The AM26LS31x is the driver half of a pair of devices, with the AM26LS32 being the complementary receiver. TI recommends using these devices together for optimal performance, but any RS-422 compliant receive must ensure proper RS-422 communication and logic level translation. |
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