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M54HC40102 Datasheet(PDF) 7 Page - STMicroelectronics |
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M54HC40102 Datasheet(HTML) 7 Page - STMicroelectronics |
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7 / 14 page  The HC40102 and HC40103 are 8-stage preset- table synchronous down counters. Carry Out/Zero Detect (CO/ZD) is output at the ”L” level for the period of 1 bit when the readout becomes ”0”. The HC40102 adopts binary coded decimal notation, making setting up to 99 counts possible. While the HC40103 adopts 8-bit binary counter and can set up to 255 counts. COUNT OPERATION At the ”H” level of control input of CLEAR, SPE and APE, the counter carriers out down count operation one by one at the rise of pulse given to CLOCK input. Count operation can be inhibited by setting Carry Input/Clock Enable CI/CE to the ”H” level. CO/ZD is output at the ”L” level when the readout becomes ”0” but is not output even if the readout becomes ”0” when CI/CE is at the ”H” level, thus maintaining the ”H” level. Synchronous cascade operation can be carried out by using CI/CE input and CO/ZD output. The contents of count jump to maximum count (99 for the HC40102 and 225 for the HC40103) if clock is given when the readout is ”0”. Therefore, oper- ation of 100-frequency division and that of 256-fre- quency division are carried out for the HC40102 and HC40103, respectively, when clock input alone is given without various kinds of preset operation. PRESET OPERATION AND RESET OPERATION When Clear (CLEAR) input is set to the ”L” level, the readout is set to the maximum count independetly of other inputs. When Asynchronous Preset Enable (APE) input is set to the ”L” level, readouts given on J0 to J7 can be preset asynchronously to counter in- dependently of inputs other than CLEAR input. When Synchronous Preset Enable (SPE) is set to the ”L” level, the readouts given on J0 to J7 can be preset to counter synchronously with the rise of clock. As to these operation modes, refer to the truth table. FUNCTIONAL DESCRIPTION Input Output CLEAR APE S P E J T E CLO CK Q n +1 LX X X X X L HL X L X X L HL X H X X H HH L L X _ v _L HH L H X _ v _H HH L X X _ w _ __ Q n HH H X L _ v _Qn HH H X H X __ Q n M54/M74HC40102/40103 7/14 |
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