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SN74HCS164 bảng dữ liệu(PDF) 12 Page - Texas Instruments |
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SN74HCS164 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 In this application, the SN74HCS164 is used to control seven-segment displays. Unlike other I/O expanders, the SN74HCS164 does not need a communication interface for control. It can be easily operated with simple GPIO pins. Additional control is provided with two serial inputs that feed into an AND gate. At power-up, the initial state of the shift registers is unknown. To give them a defined state, the shift register needs to be cleared. An RC can be connected to the CLR pin as shown in Typical Application Block Diagram to initialize the shift register to all zeros. 9.2 Typical Application Seven Segment CLR QA QB QC QD QE QF QG QH g f a b DP c d e a b c d e f g DP GND VCC A B CLK MCU R1 C1 VCC 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 SN74HCS164 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. The ground must be capable of sinking current equal to the total current to be sunk by all outputs of the SN74HCS164 plus the maximum supply current, ICC, listed in Electrical Characteristics, and any transient current required for switching. The logic device can only sink as much current as can be sunk into its ground connection. Be sure not to exceed the maximum total current through GND listed in the Absolute Maximum Ratings. SN74HCS164 SCLS827 – AUGUST 2020 www.ti.com 12 Submit Document Feedback Copyright © 2020 Texas Instruments Incorporated Product Folder Links: SN74HCS164 |
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