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74VCX16839MTD Scheda tecnica(PDF) 2 Page - Fairchild Semiconductor |
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74VCX16839MTD Scheda tecnica(HTML) 2 Page - Fairchild Semiconductor |
2 / 7 page www.fairchildsemi.com 2 Connection Diagram Truth Table H = Logic HIGH L = Logic LOW X = Don’t Care, but not floating Z = High Impedance ↑ = LOW-to-HIGH Clock Transition Functional Description The 74VCX16839 consists of twenty selectable non-invert- ing buffers or registers with word wide modes. Mode func- tionality is selected through operation of the CLK and REGE pin as shown by the truth table. When REGE is held at a logic HIGH the device operates as a 20-bit register. Data is transferred from In to On on the rising edge of the CLK input. When the REGE pin is held at a logic LOW the device operates in a flow through mode and data propa- gates directly from the In to the On outputs. All outputs can be 3-stated by holding the OE pin at a logic HIGH. Logic Diagram Inputs Outputs CLK REGE In OE On ↑ HH L H ↑ HL L L XL H L H X LLL L XXX H Z |
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