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SN54HC74 Datasheet(PDF) 13 Page - Texas Instruments |
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SN54HC74 Datasheet(HTML) 13 Page - Texas Instruments |
13 / 15 page Vcc Unused Input Input Output Input Unused Input Output SN54HC74, SN74HC74 www.ti.com SCLS094E – DECEMBER 1982 – REVISED DECEMBER 2015 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 6 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 must be applied to any particular unused input depends on the function of the device. Generally they are 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 disables the output section of the part when asserted. This pin keeps the input section of the I/Os from being disabled and floated. 11.2 Layout Example Figure 6. Layout Diagram Copyright © 1982–2015, Texas Instruments Incorporated Submit Documentation Feedback 13 Product Folder Links: SN54HC74 SN74HC74 |
Similar Part No. - SN54HC74_15 |
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Similar Description - SN54HC74_15 |
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