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TMUX1308 数据表(PDF) 22 Page - Texas Instruments |
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TMUX1308 数据表(HTML) 22 Page - Texas Instruments |
22 / 42 page 8.2 Functional Block Diagram The TMUX1308 is an 8:1, single-ended (1-channel), mux. The TMUX1309 is a 4:1, differential (2-channel) mux. Each channel is turned on or turned off based on the state of the address lines and enable pin. TMUX130 8 A0 A1 A2 EN S1 D S2 S3 S4 S5 S6 S7 S0 1-OF-8 DECODER TMUX130 9 S0A DB S1A S2A S3A S0B S1B S2B S3B DA A0 A1 EN 1-OF-4 DECODER Figure 8-12. TMUX1308 and TMUX1309 Functional Block Diagram 8.3 Feature Description 8.3.1 Bidirectional Operation The TMUX1308 and TMUX1309 devices conduct equally well from source (Sx) to drain (Dx) or from drain (Dx) to source (Sx). Each signal path has very similar characteristics in both directions so they can be used as both multiplexers and demultiplexer to supports both analog and digital signals. 8.3.2 Rail-to-Rail Operation The valid signal path input and output voltage for the TMUX1308 and TMUX1309 ranges from GND to VDD. 8.3.3 1.8 V Logic Compatible Inputs The TMUX1308 and TMUX1309 support 1.8-V logic compatible control for all logic control inputs. The logic input thresholds scale with supply but still provide 1.8-V logic control when operating at 5.5-V supply voltage. 1.8-V logic level inputs allows the multiplexers to interface with processors that have lower logic I/O rails and eliminates the need for an external voltage translator, which saves both space and BOM cost. The current consumption of the TMUX1308 and TMUX1309 devices increase when using 1.8-V logic with higher supply voltage. For more information on 1.8-V logic implementations refer to Simplifying Design with 1.8 V logic Muxes and Switches. 8.3.4 Fail-Safe Logic The TMUX1308 and TMUX1309 device have Fail-Safe Logic on the control input pins (EN, A0, A1, and A2) allowing for operation up to 5.5-V, regardless of the state of the supply pin. This feature allows voltages on the control pins to be applied before the supply pin, protecting the device from potential damage. Fail-Safe Logic minimizes system complexity by removing the need for power supply sequencing on the logic control pins. For example, the Fail-Safe Logic feature allows the select pins of the TMUX1308 and TMUX1309 to be ramped to 5.5-V while VDD = 0-V. Additionally, the feature enables operation of the multiplexers with VDD = 1.8-V while allowing the select pins to interface with a logic level of another device up to 5.5-V, eliminating the potential need for an external voltage translator. 8.3.5 Injection Current Control Injection current is the current that is being forced into a pin by an input voltage (VIN) higher than the positive supply (VDD + ∆V) or lower than ground (VSS). The current flows through the input protection diodes into whichever supply of the device potentially compromising the accuracy and reliability of the system. Injected currents can come from various sources depending on the application. TMUX1308, TMUX1309 SCDS426C – MARCH 2020 – REVISED AUGUST 2020 www.ti.com 22 Submit Document Feedback Copyright © 2020 Texas Instruments Incorporated Product Folder Links: TMUX1308 TMUX1309 |
类似零件编号 - TMUX1308_V01 |
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类似说明 - TMUX1308_V01 |
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