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HD74HC679T Datasheet

  • HD74HC679T

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HD74HC679
12-bit Address Comparator
Description
The HD74HC679 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 information applied to the 12 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 A
1
through A
7
must be low and that inputs A
8
through A
12
must be high to cause the output to go
low. Equality of the address amplified at the A inputs to the preprogrammed address is indicated by the
output 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
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High Speed Operation: t
pd
(A to Y) = 18 ns typ (C
L
= 50 pF)
High Output Current: Fanout of 10 LSTTL Loads
Wide Operating Voltage: V
CC
= 2 to 6 V
Low Input Current: 1 碌A(chǔ) max
Low Quiescent Supply Current: I
CC
(static) = 4 碌A(chǔ) max (Ta = 25擄C)

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