Brief Description of 54/7440 Dual 4-Input NAND Buffer 40 is two groups of 4-input NAND buffers (positive logic). There are four circuit structures: 54/7440, 54/74H40, 54/74S40, and 54/74LS40. The typical values of their main electrical characteristics are as follows: Model tPLH tPHL PD5440/7440 13ns 8ns 53mW54H40/74H40 8.5ns 6.5ns 89mW54S40/74S40 4ns 4.5ns 88mW54LS40/74LS40 12ns 12ns 8.7mWPin Symbol 1A-1D Input 2A-2D Input 1Y-2Y Output Logic Diagram
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