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74ABT16821ADGG 데이터시트(PDF) 5 Page - NXP Semiconductors |
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5 / 16 page 74ABT16821A_3 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved. Product data sheet Rev. 03 — 16 March 2010 5 of 16 NXP Semiconductors 74ABT16821A 20-bit bus-interface D-type flip-flop; positive-edge trigger; 3-state 5.2 Pin description 6. Functional description [1] H = HIGH voltage level; h = HIGH voltage level one set-up time prior to the LOW-to-HIGH clock transition; L = LOW voltage level; l = LOW voltage level one set-up time prior to the LOW-to-HIGH clock transition; ↑ = LOW-to-HIGH clock transition; NC = no change; X = don’t care; Z = high-impedance OFF-state. Table 2. Pin description Symbol Pin Description 1OE, 2OE 1, 28 output enable input (active LOW) 1Q0 to 1Q9 2, 3, 5, 6, 8, 9, 10, 12, 13, 14 data output GND 4, 11, 18, 25, 32, 39, 46, 53 ground (0 V) VCC 7, 22, 35, 50 supply voltage 2Q0 to 2Q9 15, 16, 17, 19, 20, 21, 23, 24, 26, 27 data output 2CP, 1CP 29, 56 clock pulse input (active rising edge) 2D0 to 2D9 42, 41, 40, 38, 37, 36, 34, 33, 31, 30 data input 1D0 to1D9 55, 54, 52, 51, 49, 48, 47, 45, 44, 43 data input Table 3. Function table[1] Input Output Internal register Operating mode nOE nCP nDx nQ0 to nQ9 L ↑ l L L load + read register L ↑ h H H load + read register L H or L X NC NC hold H L or H X Z NC disable output H ↑ Dn Z Dn disable output |
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