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MC74HC164A Datasheet(PDF) 6 Page - ON Semiconductor |
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MC74HC164A Datasheet(HTML) 6 Page - ON Semiconductor |
6 / 11 page MC74HC164A http://onsemi.com 6 PIN DESCRIPTIONS INPUTS A1, A2 (Pins 1, 2) Serial Data Inputs. Data at these inputs determine the data to be entered into the first stage of the shift register. For a high level to be entered into the shift register, both A1 and A2 inputs must be high, thereby allowing one input to be used as a data−enable input. When only one serial input is used, the other must be connected to VCC. Clock (Pin 8) Shift Register Clock. A positive−going transition on this pin shifts the data at each stage to the next stage. The shift register is completely static, allowing clock rates down to DC in a continuous or intermittent mode. OUTPUTS QA − QH (Pins 3, 4, 5, 6, 10, 11, 12, 13) Parallel Shift Register Outputs. The shifted data is presented at these outputs in true, or noninverted, form. CONTROL INPUT Reset (Pin 9) Active−Low, Asynchronous Reset Input. A low voltage applied to this input resets all internal flip−flops and sets Outputs QA − QH to the low level state. SWITCHING WAVEFORMS tf VCC GND 90% 50% 10% tw tPLH tPHL CLOCK Q tTLH tTHL Figure 1. RESET trec Figure 2. tr 1/fmax 90% 50% 10% VCC GND VCC GND Q CLOCK 50% 50% 50% tPHL tw A1 OR A2 Figure 3. VCC GND VCC GND 50% 50% CLOCK tsu th VALID *Includes all probe and jig capacitance CL* TEST POINT DEVICE UNDER TEST OUTPUT Figure 4. Test Circuit |
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