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SN74CBT3251DBQRG4 데이터시트(PDF) 7 Page - Texas Instruments |
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SN74CBT3251DBQRG4 데이터시트(HTML) 7 Page - Texas Instruments |
7 / 25 page B5 B1 A B2 B3 B4 B6 B7 B8 OE S0 S1 S2 5 7 11 10 9 4 3 2 1 15 14 13 12 SN74CBT3251 www.ti.com SCDS019M – MAY 1995 – REVISED DECEMBER 2015 8 Detailed Description 8.1 Overview The SN74CBT3251 device is a single 8-channel multiplexer with three binary control inputs, S0, S1, and S2 and an OE (output enable, active low) input. The three binary signals select 1 of 8 channels to be turned on, and connect one of the 8 inputs to the output. When they are used as demultiplexers, the CHANNEL IN/OUT terminals (B) are the outputs and the COMMON OUT/IN terminal (A) is the input. 8.2 Functional Block Diagram Figure 3. Logic Diagram (Positive Logic) 8.3 Feature Description The SN74CBT3251 1-of-8 FET multiplexers and demultiplexers can accept a wide range of analog signal levels from 0 V to 5 V. It has low Ron resistance, typically 5- Ω for VCC = 5 V which allows very little signal loss through the switch. Binary address decoding on chip makes channel selection easy. 8.4 Device Functional Modes Table 1 lists the functional modes of the SN74CBT3251. Table 1. Function Table (Each Multiplexer and Demultiplexer) INPUTS FUNCTION OE S2 S1 S0 L L L L A port = B1 port L L L H A port = B2 port L L H L A port = B3 port L L H H A port = B4 port L H L L A port = B5 port L H L H A port = B6 port L H H L A port = B7 port L H H H A port = B8 port H X X X Disconnect Copyright © 1995–2015, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: SN74CBT3251 |
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