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74F543PC 데이터시트(PDF) 2 Page - Fairchild Semiconductor |
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74F543PC 데이터시트(HTML) 2 Page - Fairchild Semiconductor |
2 / 7 page www.fairchildsemi.com 2 Unit Loading/Fan Out Functional Description The F543 contains two sets of eight D-type latches, with separate input and output controls for each set. For data flow from A to B, for example, the A-to-B Enable (CEAB) input must be LOW in order to enter data from A0–A7 or take data from B0–B7, as indicated in the Data I/O Control Table. With CEAB LOW, a LOW signal on the A-to-B Latch Enable (LEAB) input makes the A-to-B latches transparent; a subsequent LOW-to-HIGH transition of the LEAB signal puts the A latches in the storage mode and their outputs no longer change with the A inputs. With CEAB and OEAB both LOW, the 3-STATE B output buffers are active and reflect the data present at the output of the A latches. Con- trol of data flow from B to A is similar, but using the CEBA, LEBA and OEBA inputs. Data I/O Control Table H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial A-to-B data flow shown; B-to-A flow control is the same, except using CEBA, LEBA and OEBA Logic Diagram Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. Pin Names Description U.L. Input IIH/IIL HIGH/LOW Output IOH/IOL OEAB A-to-B Output Enable Input (Active LOW) 1.0/1.0 20 µA/−0.6 mA OEBA B-to-A Output Enable Input (Active LOW) 1.0/1.0 20 µA/−0.6 mA CEAB A-to-B Enable Input (Active LOW) 1.0/2.0 20 µA/−1.2 mA CEBA B-to-A Enable Input (Active LOW) 1.0/2.0 20 µA/−1.2 mA LEAB A-to-B Latch Enable Input (Active LOW) 1.0/1.0 20 µA/−0.6 mA LEBA B-to-A Latch Enable Input (Active LOW) 1.0/1.0 20 µA/−0.6 mA A0–A7 A-to-B Data Inputs or 3.5/1.083 70 µA/−650 µA B-to-A 3-STATE Outputs 150/40 (33.8) −3 mA/24 mA (20 mA) B0–B7 B-to-A Data Inputs or 3.5/1.083 70 µA/−650 µA A-to-B 3-STATE Outputs 600/106.6 (80) −12 mA/64 mA (48 mA) Inputs Latch Output CEAB LEAB OEAB Status Buffers H X X Latched High Z X H X Latched — L L X Transparent — XX H — High Z LX L — Driving |
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