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HCF4054BF bảng dữ liệu(PDF) 2 Page - STMicroelectronics |
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2 / 15 page PIN CONNECTIONS 4054B 4055B 4056B as L, P, H, A,– , and a blank position. (see typical ap- plication for other letters). The HCC/HCF4054B pro- vides level shifting similar to the HCC/HCF4055B and HCC/HCF4056B independently strobed latches, and common DF control on 4 signal lines. The HCC/HCF4054B is intended to provide drive-signal compatibility with the HCC/HCF4055B and HCC/HCF4056B 7-segment decoder types for the decimal point, colon, polarity, and similar display lines. A level-shifted high-amplitude DF output can be ob- tained from any HCC/HCF4054B output line by con- necting the corresponding input and strobe lines to a low and high level, respectively. The HCC/HCF4054B may also be utilized for logic-level ”up conversion” or ”down conversion”. Forexample, input-signal swings (VDD to VSS) from + 5 to 0V can be converted to output-signal swings (VDD to VEE)of + 5 to – 5V. The level-shifted function on all three types permits the use of different input-and output- signal swings. The input swings from a low level of VSS to a high level of VDD while the output swings from a low level of VEE to the same high level of VDD. Thus, the input and output swings can be selected independently of each other over a 3-to-18V range. VSS may be connected to VEE when no level-shift function is required. For the HCC/HCF 4054B and HCC/HCF 4056B, data are transferred from input to output by placing a high voltage level at the strobe input. A low voltage level at the strobe input latches the data input and the corresponding output seg- ments remain selected (or non-selected) while the strobe is low. Whenever the level-shifting function is required, the HCC/HCF4055B can be used by it- self to drive a liquid-crystal display (fig. 10 and fig. 12). The HCC/HCF4056B, however, must be used together with a HCC/HCF4054B to provide the com- mon DF output (fig. 14). The capability of extending the voltage swing on the negative end (this voltage cannot be extended on the positive end) can be used to advantage in the set-up of fig. 11. Fig. 9 is common to all three types. HCC/HCF4054B/55B/56B 2/15 |
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