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HCF4033B Fiches technique(PDF) 2 Page - STMicroelectronics |
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HCF4033B Fiches technique(HTML) 2 Page - STMicroelectronics |
2 / 11 page HCF4033B 2/11 INPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No SYMBOL NAME AND FUNCTION 1 CLOCK Clock Input 10, 12, 13, 9, 11, 6, 7 a to g 7 - Segments Decoded Outputs 2 CLOCK INHIBIT Clock Inhibit Input 15 RESET Reset Input 3 RIPPLE BLANKING IN Ripple Blanking Input 5 CARRY OUT Carry Out Output 4 RIPPLE BLANKING OUT Ripple Blanking Output 14 LAMP TEST Lamp Test Input 8 VSS Negative Supply Voltage 16 VDD Positive Supply Voltage The seven decoded outputs (a, b, c, d, e, f, g) illuminate the proper segments in a seven segment display device used for representing the decimal numbers 0 to 9. The 7-segment outputs go high on selection. This device has provisions for automating blanking of the non-significant zeros in a multi digit decimal number which results in a easily readable display consistent with normal writing practice. For example, the number 0050.07000 in an eight digit display would be displayed as 50.07. Zero suppression on the integer side is obtained by connecting the RBI terminal of the HCF4033B associated with the most significant digit in the display to a low level voltage and connecting the RBO terminal of that stage to the RBI terminal of the HCF4033B in the next lower significant position in the display. This procedure is continued for each succeeding HCF4033B on the integer side of the display. On the fraction side of the display the RBI of the HCF4033B associated with the least significant bit is connected to a low level voltage and the RBO of that HCF4033B is connected to the RBI terminal of the HCF4033B in the next more significant bit position. Again, this procedure is continued for all HCF4033B’s on the fraction side of the display. In a purely fractional number the zero immediately preceding the decimal point can be displayed by connecting the RBI of that stage to a high level voltage (instead of to the RBO of the next more significant stage). For example : optional zero → 0.7346. Likewise, the zero in a number such as 763.0 can be displayed by connecting the RBI of the HCF4033B associated with it to a high level voltage. Ripple blanking of non-significant zeros provides an appreciable savings in display power. The HCF4033B has a LAMP TEST input which, when connected to a high level voltage, overrides normal decoder operation and enables a check to be made on possible display malfunctions by putting the seven outputs in the high state. |
Numéro de pièce similaire - HCF4033B |
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Description similaire - HCF4033B |
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