HD74HC677 데이터 시트보기 (PDF) - Hitachi -> Renesas Electronics

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HD74HC677

16-bit Address Comparator

Hitachi -> Renesas Electronics 

HD74HC677

16-bit Address Comparator

Description

The HD74HC677 address comparator simplifies addressing of memory boards and/or other peripheral

devices. The four P inputs are normally hard wired with a preprogrammed address. An internal decoder

determines what input infomation applied to the 16 A inputs must be low or high to cause a low state at the

output (Y). For example, a positive-logic bit combination of 0111 (decimal 7) at the P input determines

that inputs A1 through A7 must be low and that inputs A8 through A16 must be high to cause the output to go

low. Equality of the address applied at the A inputs to the preprogrammed address is indicated by the

output being low.

The HD74HC677 features an 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) = 17 ns typ (CL = 50 pF)

• High Output Current: Fanout of 10 LSTTL Loads

• Wide Operating Voltage: VCC = 2 to 6 V

• Low Input Current: 1 µA max

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

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