资 源 简 介
The CD74HCT4514 and CD74HCT4515 are high-speed silicon-gate devices consisTIng of a 4-bit strobed latch and a 4-line to 16-line decoder. The selected output is enabled by a low on the enable (E) input. A high on E inhibits selecTIon of any output. DemulTIplexing is accomplished by using E as the data input and the select inputs (A0–A3) as addresses. E also serves as a chip select when these devices are cascaded.
When the latch enable (LE) is high, the output follows changes in the inputs (see decode funcTIon table). When LE is low, the output is isolated from changes in the input and remains at the level (high for the ’4514, low for the ’4515) it had before the latch was enabled.
