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SN74HC04PWR 数据表(PDF) 11 Page - Texas Instruments |
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SN74HC04PWR 数据表(HTML) 11 Page - Texas Instruments |
11 / 29 page Vcc Unused Input Input Output Input Unused Input Output SN54HC04, SN74HC04 www.ti.com SCLS078G – DECEMBER 1982 – REVISED SEPTEMBER 2015 10 Power Supply Recommendations The power supply can be any voltage between the MIN and MAX supply voltage rating located in Recommended Operating Conditions. Each VCC pin should have a good bypass capacitor to prevent power disturbance. For devices with a single supply, TI recommends a 0.1- μF bypass capacitor. If there are multiple VCC pins, TI recommends a 0.01-μF or 0.022- μF bypass capacitors for each power pin. It is acceptable to parallel multiple bypass capacitors to reject different frequencies of noise. A 0.1 μF and 1 μF bypass capacitors are commonly used in parallel. For best results, install the bypass capacitor as close to the power pin as possible for best. 11 Layout 11.1 Layout Guidelines When using multiple bit logic devices, inputs should not float. In many cases, functions or parts of functions of digital logic devices are unused. Some examples are when only two inputs of a triple-input AND gate are used, or when only 3 of the 4-buffer gates are used. Such input pins should not be left unconnected because the undefined voltages at the outside connections result in undefined operational states. Specified in Figure 7 are rules that must be observed under all circumstances. All unused inputs of digital logic devices must be connected to a high or low bias to prevent them from floating. The logic level that should be applied to any particular unused input depends on the function of the device. Generally they will be tied to GND or VCC, whichever makes more sense or is more convenient. It is acceptable to float outputs unless the part is a transceiver. If the transceiver has an output enable pin, it will disable the outputs section of the part when asserted. This will not disable the input section of the I/Os so they also cannot float when disabled. 11.2 Layout Example Figure 7. Layout Diagram Copyright © 1982–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: SN54HC04 SN74HC04 |
类似零件编号 - SN74HC04PWR |
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类似说明 - SN74HC04PWR |
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