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MC14559BDWR2 Datenblatt(PDF) 5 Page - ON Semiconductor |
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MC14559BDWR2 Datenblatt(HTML) 5 Page - ON Semiconductor |
5 / 9 page MC14549B, MC14559B http://onsemi.com 5 OPERATING CHARACTERISTICS Both the MC14549B and MC14559B can be operated in either the “free run” or “strobed operation” mode for conversion schemes with any number of bits. Reliable cascading and/or recirculating operation can be achieved if the End of Convert (EOC) output is used as the controlling function, since with EOC = 0 (and with SC = 1 for MC14549B but either 1 or 0 for MC14559B) no stable state exists under continual clocked operation. The MC14559B will automatically recirculate after EOC = 1 during externally strobed operation, provided SC = 1. All data and control inputs for these devices are triggered into the circuit on the positive edge of the clock pulse. Operation of the various terminals is as follows: C = Clock — A positive−going transition of the Clock is required for data on any input to be strobed into the circuit. SC = Start Convert — A conversion sequence is initiated on the positive−going transition of the SC input on succeeding clock cycles. D = Data in — Data on this input (usually from a comparator in A/D applications) is also entered into the circuit on a positive−going transition of the clock. This input is Schmitt triggered and synchronized to allow fast response and guaranteed quality of serial and parallel data. MR = Master Reset (MC14549B Only) — Resets all output to 0 on positive−going transitions of the clock. If removed while SC = 0, the circuit will remain reset until SC = 1. This allows easy cascading of circuits. FF = Feed Forward (MC14559B Only) — Provides register shortening by removing unwanted bits from a system. For operation with less than 8 bits, tie the output following the least significant bit of the circuit to EOC. E.g., for a 6−bit conversion, tie Q1 to FF; the part will respond as shown in the timing diagram less two bit times. Not that Q1 and Q0 will still operate and must be disregarded. For 8−bit operation, FF is tied to VSS. For applications with more than 8 but less than 16 bits, use the basic connections shown in Figure 1. The FF input of the MC14559B is used to shorten the setup. Tying FF directly to the least significant bit used in the MC14559B allows EOC to provide the cascading signal, and results in smooth transition of serial information from the MC14559B to the MC14549B. The Serial Out (Sout) inhibit structure of the MC14559B remains inactive one cycle after EOC goes high, while Sout of the MC14549B remains inhibited until the second clock cycle of its operation. Qn = Data Outputs — After a conversion is initiated the Q’s on succeeding cycles go high and are then conditionally reset dependent upon the state of the D input. Once conditionally reset they remain in the proper state until the circuit is either reset or reinitiated. EOC = End of Convert — This output goes high on the negative−going transition of the clock following FF = 1 (for the MC14559B) or the conditional reset of Q0. This allows settling of the digital circuitry prior to the End of Conversion indication. Therefore either level or edge triggering can indicate complete conversion. Sout = Serial Out — Transmits conversion in serial fashion. Serial data occurs during the clock period when the corresponding parallel data bit is conditionally reset. Serial Out is inhibited on the initial period of a cycle, when the circuit is reset, and on the second cycle after EOC goes high. This provides efficient operation when cascaded. Figure 1. 12−Bit Conversion Scheme †Completion of conversion automatically re−initiates cycle in free run mode. ** Cascading using EOC guaranteed; no stable unfunctional state. * FF allows EOC to activate as if in 4−stage register. Q7 Q6 Q5 Q4 Q0 EOC FF SC C D Sout MC14559B NC MSB TO D/A AND PARALLEL DATA •• ** * FROM A/D COMPARATOR Q7 Q6 Q5 MR SC C D Sout MC14549B LSB Q4 Q3 Q2 Q1 Q0 EOC TO D/A AND PARALLEL DATA { EXTERNAL STROBE FREE RUN MODE EXTERNAL CLOCK 1/4 MC14001 SERIAL OUT (CONTINUAL UPDATE EVERY 13 CLOCK CYCLES) |
Ähnliche Teilenummer - MC14559BDWR2 |
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Ähnliche Beschreibung - MC14559BDWR2 |
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