Tutorial 7

# Tutorial 7 - Elec 151 Tutorial#7 Outline Lab 7 Flip-Flops...

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RTT Elec151 - Tutorial #7 1 Outline: • Lab 7: Flip-Flops and Sequential Logic II - Clock Generator using 555 timer IC - 7-Segment Display (common anode) - BCD code - 74LS47 (BCD to 7-segment display decoder) - 4-Bit Synchronous counters - 74LS163 (Synchronous binary counter) TTL counters design - Problems Elec 151 - Tutorial #7 Elec151 - Tutorial #7 2 Clock Generator using 555 timer IC T1 = Clock high time =0 . 7 (R a +R b )C 1 T2 = Clock low time =0 . 7 (R b )C 1 T = Clock period = T1 +T2 =0 .7(R a +2R b )C 1 DC = Duty cycle = T1/T == period time high RR RR ab ab 2 0 1 T1 T2 T Clk Bypass capacitor Lab 7: Flip-Flops and Sequential Logic II 555 Timer Output .01μ F Elec151 - Tutorial #7 3 7 Segment Display 10 9 8 7 6 a b c d e f g DP 1 2 3 4 5 a b c d e f g H R=330 ohms Circuit output (74ls47 – pin “g”) “L” H (common anode) Elec151 - Tutorial #7 4 BCD (Binary Coded Decimal) With BCD code, you can represent “ decimal digits ” using “ binary numbers e.g . Decimal numbers 68 BCD numbers 0110 1000 1000 0010 82 Binary numbers 0001 BCD numbers 0000 0001 0000 1000 1000 0001

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RTT Elec151 - Tutorial #7 5 74LS47 (BCD to 7-Segment Decoder) Elec151 - Tutorial #7 6 4-BIT Synchronous Counters: 74LS160, 161, 162, 163 4-BIT SYNCHRONOUS COUNTERS (Cascadables, same physical appearance and pin assignments, synchronous count) Clear (reset) Preset (Load,
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Tutorial 7 - Elec 151 Tutorial#7 Outline Lab 7 Flip-Flops...

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