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M54HC74 数据表(PDF) 2 Page - STMicroelectronics |
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M54HC74 数据表(HTML) 2 Page - STMicroelectronics |
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2 / 12 page  M54HC74 2/12 Figure 1: IEC Logic Symbols Figure 2: Input And Output Equivalent Circuit Table 1: Pin Description Table 2: Truth Table X : Don’t Care PIN N° SYMBOL NAME AND FUNCTION 1,13 1CLR,2CLR Asynchronous Reset - Direct Input 2, 12 1D, 2D Data Inputs 3, 11 1CK, 2CK Clock Input (LOW-to-HIGH, Edge-Triggered) 4, 10 1PR,2PR Asynchronous Set - Direct Input 5, 9 1Q, 2Q True Flip-Flop Outputs 6, 8 1Q,2Q Complement Flip-Flop Outputs 7 GND Ground (0V) 14 VCC Positive Supply Voltage INPUTS OUTPUTS FUNCTION CLR PR DCK Q Q LH X X LH CLEAR H L X X H L PRESET L L X X H H ---- H H L L H ---- H H H H L ---- HH X Qn Qn NO CHANGE |
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