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74ACT18823MTD Scheda tecnica(PDF) 2 Page - Fairchild Semiconductor |
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74ACT18823MTD Scheda tecnica(HTML) 2 Page - Fairchild Semiconductor |
2 / 6 page www.fairchildsemi.com 2 Functional Description The ACT18823 consists of eighteen D-type edge-triggered flip-flops. These have 3-STATE outputs for bus systems organized with inputs and outputs on opposite sides. The device is byte controlled with each byte functioning identi- cally, but independent of the other. The control pins can be shorted together to obtain full 16-bit operation. The follow- ing description applies to each byte. The buffered clock (CPn) and buffered Output Enable (OEn) are common to all flip-flops within that byte. The flip-flops will store the state of their individual D inputs that meet set-up and hold time requirements on the LOW-to-HIGH CPn transition. With OEn LOW, the contents of the flip-flops are available at the outputs. When OEn is HIGH, the outputs go to the imped- ance state. Operation of the OEn input does not affect the state of the flip-flops. In addition to the Clock and Output Enable pins, there are Clear (CLRn) and Clock Enable (ENn) pins. These devices are ideal for parity bus interfac- ing in high performance systems. When CLRn is LOW and OEn is LOW, the outputs are LOW. When CLRn is HIGH, data can be entered into the flip-flops. When ENn is LOW, data on the inputs is trans- ferred to the outputs on the LOW-to-HIGH clock transition. When the ENn is HIGH, the outputs do not change state, regardless of the data or clock input transitions. Function Table (Note 1) H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Z = High Impedance = LOW-to-HIGH Transition NC = No Change Note 1: The table represents the logic for one byte. The two bytes are inde- pendent of each other and function identically. Logic Diagrams Byte 1 (0:8) Byte 2 (9:17) Inputs Internal Output Function OE CLR EN CP In QOn HX L L L Z High Z HX L H H Z High Z H L XXX L Z Clear L L XXX L L Clear H H H X X NC Z Hold LH H X X NC NC Hold HH L L L Z Load HH L H H Z Load LH L L L L Load LH L H H H Load |
Codice articolo simile - 74ACT18823MTD |
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Descrizione simile - 74ACT18823MTD |
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