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A6278ELW-T Datasheet(PDF) 5 Page - Allegro MicroSystems |
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A6278ELW-T Datasheet(HTML) 5 Page - Allegro MicroSystems |
5 / 18 page Serial-Input, Constant-Current Latched LED Drivers with Open LED Detection A6278 and A6279 5 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Serial Data Input Clock Input Shift Register Contents Serial Data Out Latch Enable Input Latch Contents Output Enable Input Output Contents I0 I1 I2 … In-1 In I0 I1 I2 … In-1 In I0 I1 I2 … In-1 In H H R0 R1 … Rn-2 Rn-1 R n -1 L L R0 R1 … Rn-2 Rn-1 R n -1 X R0 R1 R2 … Rn-1 Rn R n X X X … X X X L R0 R1 R2 … Rn-1 Rn P0 P1 P2 … Pn-1 Pn P n HP0 P1 P2 … Pn-1 Pn LP0 P1 P2 … Pn-1 Pn X X X … X X H H H H … H H L = Low logic (voltage) level H = High logic (voltage) level X = Don’t care P = Present state R = Previous state n = 7 for the A6278, n = 15 for the A6279 Truth Table Inputs and Outputs Equivalent Circuits VDD IN VDD LE VDD OUT VDD IN VDD IN OUTPUT ENABLE (active low) CLOCK and SERIAL DATA IN LATCH ENABLE SERIAL DATA OUT |
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