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74HC595DB Datasheet(PDF) 5 Page - NXP Semiconductors |
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74HC595DB Datasheet(HTML) 5 Page - NXP Semiconductors |
5 / 24 page 74HC_HCT595 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved. Product data sheet Rev. 6 — 12 December 2011 5 of 24 NXP Semiconductors 74HC595; 74HCT595 8-bit serial-in, serial or parallel-out shift register with output latches; 3-state 6.2 Pin description 7. Functional description [1] H = HIGH voltage state; L = LOW voltage state; = LOW-to-HIGH transition; X = don’t care; NC = no change; Z = high-impedance OFF-state. Table 2. Pin description Symbol Pin Description Q1 1 parallel data output 1 Q2 2 parallel data output 2 Q3 3 parallel data output 3 Q4 4 parallel data output 4 Q5 5 parallel data output 5 Q6 6 parallel data output 6 Q7 7 parallel data output 7 GND 8 ground (0 V) Q7S 9 serial data output MR 10 master reset (active LOW) SHCP 11 shift register clock input STCP 12 storage register clock input OE 13 output enable input (active LOW) DS 14 serial data input Q0 15 parallel data output 0 VCC 16 supply voltage Table 3. Function table[1] Control Input Output Function SHCP STCP OE MR DS Q7S Qn X X L L X L NC a LOW-level on MR only affects the shift registers X L L X L L empty shift register loaded into storage register X X H L X L Z shift register clear; parallel outputs in high-impedance OFF-state X L H H Q6S NC logic HIGH-level shifted into shift register stage 0. Contents of all shift register stages shifted through, e.g. previous state of stage 6 (internal Q6S) appears on the serial output (Q7S). X L H X NC QnS contents of shift register stages (internal QnS) are transferred to the storage register and parallel output stages L H X Q6S QnS contents of shift register shifted through; previous contents of the shift register is transferred to the storage register and the parallel output stages |
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