您的位置： 文档网所有分类工程科技电子/电路 HD74HC679RP中文资料

HD74HC679RP中文资料

HD74HC679

12-bit Address Comparator

ADE-205-526 (Z)

1st. EditionSep. 2000

Description

The HD74HC679 address comparator simplifies addressing of memory boards and/or other peripheraldevices. The four P inputs are normally hard wired with a preprogrammed address. An internal decoderdetermines what input information applied to the 12 A inputs must be low or high to cause a low state at theoutput (Y). For example, a positive-logic bit combination of 0111 (decimal 7) at the P input determinesthat inputs A1 through A7 must be low and that inputs A8 through A12 must be high to cause the output to golow. Equality of the address amplified at the A inputs to the preprogrammed address is indicated by theoutput being low.

The HD74HC679 features and enable input (G). When G is low, the device is enabled. When G is high,the device is disabled and the output is high regardless of the A and P inputs.

Features

High Speed Operation: tpd (A to Y) = 18 ns typ (CL = 50 pF)High Output Current: Fanout of 10 LSTTL LoadsWide Operating Voltage: VCC = 2 to 6 VLow Input Current: 1 µA max

Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)

第1页

HD74HC679RP中文资料的相关文档搜索

HD74HC679RP中文资料相关文档

最新文档

返回顶部