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54AC169 датащи(PDF) 3 Page - Texas Instruments |
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54AC169 датащи(HTML) 3 Page - Texas Instruments |
3 / 11 page OBSOLETE 54AC169, 54ACT169 www.ti.com SNOS092B – JULY 1998 – REVISED APRIL 2013 FUNCTIONAL DESCRIPTION The 'AC/'ACT169 uses edge-triggered J-K-type flip-flops and have no constraints on changing the control or data input signals in either state of the Clock. The only requirement is that the various inputs attain the desired state at least a setup time before the rising edge of the clock and remain valid for the recommended hold time thereafter. The parallel load operation takes precedence over the other operations, as indicated in the Mode Select Table. When PE is LOW, the data on the P0–P3 inputs enters the flip-flops on the next rising edge of the Clock. In order for counting to occur, both CEP and CET must be LOW and PE must be HIGH; the U/D input then determines the direction of counting. The Terminal Count (TC) output is normally HIGH and goes LOW, provided that CET is LOW, when a counter reaches zero in the Count Down mode or reaches 15 in the Count Up mode. The TC output state is not a function of the Count Enable Parallel (CEP) input level. If an illegal state occurs, the 'AC169 will return to the legitimate sequence within two counts. Since the TC signal is derived by decoding the flip-flop states, there exists the possibility of decoding spikes on TC. For this reason the use of TC as a clock signal is not recommended (see logic equations below). 1. Count Enable = CEP •CET • PE 2. Up: TC = Q0•Q1•Q 2Q3•(Up)•CET 3. Down: TC = Q0• Q1•Q2•Q3 •(Down)•CET Table 1. Mode Select Table(1) Action on Rising PE CEP CET U/D Clock Edge L X X X Load (Pn to Qn) H L L H Count Up (Increment) H L L L Count Down (Decrement) H H X X No Change (Hold) H X H X No Change (Hold) (1) H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial State Diagrams Copyright © 1998–2013, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: 54AC169 54ACT169 |
Аналогичный номер детали - 54AC169 |
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Аналогичное описание - 54AC169 |
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