74 series Digital Integrated Circuits
HD74LS47P
HD74LS47P

 

HD74LS47P

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BUY HD74LS47P https://www.utsource.net/itm/p/1706850.html
Decoder/Driver

Parameter Symbol Conditions Min Typ Max Unit
Operating Supply Voltage VCC Operating 4.75 5.0 5.25 V
Input Low Level Voltage VIL IL = 1.6 mA 0.0 - 0.8 V
Input High Level Voltage VIH IH = 20 μA 2.0 - 5.25 V
Output Low Level Voltage VOL IOL = 16 mA 0.0 - 0.5 V
Output High Level Voltage VOH IOH = -0.4 mA 2.7 - 5.25 V
Propagation Delay Time tpd VCC = 5V, TA = 25°C 30 - 60 ns
Power Dissipation PD Continuous - - 100 mW
Operating Temperature Range TA Storage -55 - 125 °C

Instructions for Using HD74LS47P

  1. Power Supply:

    • Connect the VCC pin to a 5V power supply.
    • Ground the GND pin.

  2. Input Connections:

    • Connect the BCD (Binary-Coded Decimal) inputs A, B, C, and D to your digital signal source.
    • Ensure that the input voltages meet the specified levels (VIL and VIH).

  3. Output Connections:

    • The outputs a, b, c, d, e, f, g drive the segments of a 7-segment display.
    • Connect these outputs to the corresponding segments of the display.

  4. Latch Enable (LE):

    • Use the LE pin to control when the BCD input is latched into the decoder.
    • Set LE high to enable latching and low to disable it.

  5. Ripple Blank Input (RBI):

    • Use the RBI pin to blank leading zeros in multiple-digit displays.
    • Set RBI high to enable blanking and low to disable it.

  6. Ripple Blank Output (RBO):

    • The RBO pin can be used to cascade multiple HD74LS47P decoders for multi-digit displays.
    • Connect RBO to the RBI of the next decoder in the chain.

  7. Test Input (LT):

    • Use the LT pin to test the decoder.
    • Set LT low to put the decoder in test mode, which will light all segments of the display.

  8. Operating Conditions:

    • Ensure the operating temperature is within the specified range (-55°C to 125°C).
    • Do not exceed the maximum power dissipation of 100 mW.

  9. Handling:

    • Handle the IC with care to avoid static damage.
    • Store the IC in a dry place to prevent moisture damage.

  10. Schematic Example:

    • Refer to the datasheet for a typical application circuit showing how to connect the HD74LS47P to a 7-segment display and other components.
(For reference only)

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