Datenblatt-Suchmaschine für elektronische Bauteile |
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CD74HC299M Datenblatt(PDF) 2 Page - Texas Instruments |
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CD74HC299M Datenblatt(HTML) 2 Page - Texas Instruments |
2 / 17 page 2 Functional Diagram MODE SELECT FUNCTION TABLE THREE-STATE I/O PORT OPERATING MODE FUNCTION INPUTS INPUTS/OUTPUTS OE1 OE2 S0 S1 Qn (REGISTER) I/O0 --- I/O7 Read Register L L L X L L L LL XH H LL X L L L LL X L H H Load Register X X H H Qn = I/On I/On = Inputs Disable I/O H X X X X (Z) XHX X X (Z) TRUTH TABLE FUNCTION INPUTS REGISTER OUTPUTS MR CP S0 S1 DS0 DS7 I/On Q0 Q1 --- Q6 Q7 RESET (CLEAR) L XXXXXX L L --- L L Shift Right H ↑ hl l X X L q0 --- q5 q6 H ↑ hlh X X H q0 --- q5 Q6 Shift Left H ↑ l h XlX q1 q2 --- q7 L H ↑ lh X h X q1 q2 --- q7 H Hold (Do Nothing) H ↑ l l XXX q0 q1 --- q6 q7 Parallel Load H ↑ hh X X l L L --- LL H ↑ h h X X h H H --- H H H = Input Voltage High Level, h = Input voltage high one set-up timer prior clock transition; L = Input Voltage Low Level; l = Input voltage low one set-up time prior to clock transition; qn = Lower case letter indicates the state of the reference output one set-up time prior to clock transition; X - Voltage level on logic status don’t care; Z = Output in high impedance state, ↑ = Low to High Clock Transition. I/O THREE-STATE OUTPUTS I/O THREE-STATE OUTPUTS SHIFT REGISTER MODE SELECTION CP OE1 OE2 MR 12 2 3 9 20 VCC 7 6 5 4 8 1 I/O0 Q0 S0 STANDARD OUTPUT I/O2 I/O4 I/O6 BUS LINE OUTPUTS GND 10 11 18 DS0 DS7 13 14 15 16 17 19 I/O1 Q7 S1 STANDARD OUTPUT I/O3 I/O5 I/O7 BUS LINE OUTPUTS THREE- STATE CONTROL CD54HC299, CD74HC299, CD54HCT299, CD74HCT299 |
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