特性 Features

? Multifunction Capability

- Binary to 1-of-16 Decoder

- 1-to-16 Line Demultiplexer

? Fanout (Over Temperature Range)

- Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads

- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads

? Wide Operating Temperature Range . . . -55oC to 125oC

? Balanced Propagation Delay and Transition Times

? Significant Power Reduction Compared to LSTTL

Logic ICs

? HC Types

- 2V to 6V Operation

- High Noise Immunity: NIL = 30%, NIH = 30% of VCC

at VCC = 5V

描述 Description

The CD54HC4514, CD74HC4514, and CD74HC4515 are

high-speed silicon gate devices consisting of a 4-bit strobed

latch and a 4- to 16-line decoder. The selected output is

enabled by a low on the enable input (E). A high on E inhibits

selection of any output. Demultiplexing is accomplished by

using the E input as the data input and the select inputs (A0-

A3) as addresses. This E input also serves as a chip select

when these devices are cascaded.

When Latch Enable (LE) is high the output follows changes

in the inputs (see truth 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 latches

were enabled. These devices, enhanced versions of the

equivalent CMOS types, can drive 10 LSTTL loads.