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SN74CB3Q3257PWG4 Fiches technique(PDF) 10 Page - Texas Instruments |
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SN74CB3Q3257PWG4 Fiches technique(HTML) 10 Page - Texas Instruments |
10 / 25 page 4 15 2 3 1 RON 7 5 6 RON 9 11 10 RON 12 14 13 RON SN74CB3Q3257 Bus Controller 4 4 Device 1 Device 2 4 16 8 GND 4A 3A 2A 1A VCC S 1B1 1B2 2B1 2B2 3B1 3B2 4B1 4B2 OE 0.1 2F VCC SN74CB3Q3257 SCDS135B – SEPTEMBER 2003 – REVISED JUNE 2015 www.ti.com 9 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 9.1 Application Information The SN74CB3Q3257 can be used to multiplex and demultiplex up to 4 channels simultaneously in a 2:1 configuration. The application shown here is a 4-bit bus being multiplexed between two devices. the OE and S pins are used to control the chip from the bus controller. This is a very generic example, and could apply to many situations. If an application requires less than 4 bits, be sure to tie the A side to either high or low on unused channels. 9.2 Typical Application Figure 5. Typical Application of the SN74CB3Q3257 9.2.1 Design Requirements 1. Recommended Input Conditions: – For specified high and low levels, see VIH and VIL in Recommended Operating Conditions. – Inputs and outputs are overvoltage tolerant slowing them to go as high as 4.6 V at any valid VCC. 2. Recommended Output Conditions: – Load currents should not exceed ±128 mA per channel. 3. Frequency Selection Criterion: – Maximum frequency tested is 500 MHz. – Added trace resistance/capacitance can reduce maximum frequency capability; use layout practices as directed in Layout. 9.2.2 Detailed Design Procedure The 0.1-µF capacitor should be place as close as possible to the device. 10 Submit Documentation Feedback Copyright © 2003–2015, Texas Instruments Incorporated Product Folder Links: SN74CB3Q3257 |
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