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SN74HCS259-Q1 bảng dữ liệu(PDF) 12 Page - Texas Instruments |
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SN74HCS259-Q1 bảng dữ liệu(HTML) 12 Page - Texas Instruments |
12 / 24 page 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 SN74HCS259-Q1 has four modes of operation. In this application, the 8-line demultiplexer mode is used to send data to one of eight possilbe desinations. At system power-on, latched outputs are in an unknown state. The CLR input is held low while the G input is held high to clear the latches for operation. At this time, all outputs are in the low state. An output is selected by setting S2, S1, and S0 as per the Latch Selection Table. After selection, the channel is activated by switching G to low. The logic value at the D input will appear at the selected output, allowing data transmission only to the selected device. When the channel communication is complete, the G input is set to high to prevent erronous outputs while the address inputs are changed, then switched back to low again to send data to the newly selected device. 9.2 Typical Application System Controller Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 D G CLR 0.1µF VCC 5V Device 1 Device 2 Device 3 Device 4 Device 5 Device 6 Device 7 Device 8 S0 S1 S2 GND Figure 9-1. Typical application block diagram 9.2.1 Design Requirements 9.2.1.1 Power Considerations Ensure the desired supply voltage is within the range specified in the Recommended Operating Conditions. The supply voltage sets the device's electrical characteristics as described in the Electrical Characteristics. The positive voltage supply must be capable of sourcing current equal to the total current to be sourced by all outputs of the SN74HCS259-Q1 plus the maximum static supply current, ICC, listed in Electrical Characteristics and any transient current required for switching. The logic device can only source as much current as is provided by the positive supply source. Be sure not to exceed the maximum total current through VCC listed in the Absolute Maximum Ratings. SN74HCS259-Q1 SCLS815 – JULY 2020 www.ti.com 12 Submit Document Feedback Copyright © 2020 Texas Instruments Incorporated Product Folder Links: SN74HCS259-Q1 |
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