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Hey Milissent,
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how do I connect U2 and U1?
2y
To connect the SN7447AN (U2) and CD74HC192E (U1) together, it's important to understand the function of these devices. The SN7447AN is a BCD to 7-segment decoder designed to drive 7-segment displays, and the CD74HC192E is a presettable synchronous 4-bit binary up/down counter. A typical application of connecting these two would be to display the counter's output value on a 7-segment display.
Assuming the goal is to display the 4-bit output of U1 (CD74HC192E) on a 7-segment display driven by U2 (SN7447AN), you would connect the outputs of U1 to the inputs of U2 corresponding to the binary-coded decimal (BCD) inputs. Note, the SN7447AN expects a BCD input to light up the appropriate segments on a 7-segment display.
The CD74HC192E outputs a binary count, so directly connecting these outputs to the BCD inputs of the SN7447AN will only correctly display decimal values 0-9 on the 7-segment display. For values above 9 (binary 1010 to 1111), the display will not show valid decimal numbers because the SN7447AN does not have proper input for encoding non-BCD values (10-15).
Here's how to make the connections based on the assumption above. We're connecting the 4-bit output (Q0-Q3) from U1 to the BCD input (A-D) of U2:
- Connect U1:Q0 to U2:A (Pins 15 to 7)
- Connect U1:Q1 to U2:B (Pins 2 to 1)
- Connect U1:Q2 to U2:C (Pins 6 to 2)
- Connect U1:Q3 to U2:D (Pins 7 to 6)
Additional connections for functionality:
- Connect both U1 and U2 ground pins to the common ground:
- Connect U1:GND to U2:GND (Pins 8 to 8)
- Connect both U1 and U2 VCC pins to the power supply:
- Connect U1:VCC to U2:VCC (Pins 16 to 16)
- You might want to connect the Latch Enable (PL), Master Reset (MR), Count Up (CPU), and Count Down (CPD) pins of U1 to appropriate control switches or logic, depending on your specific requirements for counting.
- The Lamp Test (LT), Blanking Input (BI/RBO), and Ripple Blanking Input (RBI) of U2 can be wired depending on whether you wish to use these features for testing or controlling the display.
Please adjust connections according to your specific needs, especially if your display or control logic requires different configurations.
2y
4
U2
U1
Reviews
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Spicy Bronze Carbonite Freezer
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- The CD74HC192E (U1) is used as a 4-bit binary counter.
- The SN7447AN (U2) is used to decode the 4-bit binary input to drive a common-anode 7-segment display.
- A common-anode 7-segment display is to be used with U2.
Connections- Count Outputs to Decoder Inputs:
- Connect U1:Q0 (pin 3) to U2:A (pin 7).
- Connect U1:Q1 (pin 2) to U2:B (pin 1).
- Connect U1:Q2 (pin 6) to U2:C (pin 2).
- Connect U1:Q3 (pin 7) to U2:D (pin 6).
- Power Supply Connections:
- Connect U1:VCC (pin 16) to U2:VCC (pin 16).
- Connect U1:GND (pin 8) to U2:GND (pin 8).
- Additional Necessary Connections for U2:
- For normal operation of U2 (SN7447AN), ensure the following pins are correctly set:
- Connect U2:LT (pin 3) to U2:VCC (pin 16) for active mode.
- Connect U2:BI/RBO (pin 4) to U2:VCC (pin 16) to disable blanking and allow outputs to be controlled by the data inputs.
- Connect U2:RBI (pin 5) to U2:VCC (pin 16) to disable ripple-blanking input.
Note: