SN74ALS677A Datasheet, PDF (1/7 Pages) Texas Instruments – 16-BIT ADDRESS COMPARATOR

SN74ALS677A
16ĆBIT ADDRESS COMPARATOR
ą
SDAS012C − JUNE 1982 − REVISED JANUARY 1995
• 16-Bit Address Comparator With Enable
• Package Options Include Plastic
Small-Outline (DW) Packages and Standard
Plastic (NT) 300-mil DIPs
description
This 16-bit address comparator simplifies
addressing of memory boards and/or other
peripheral devices. The four P inputs are normally
hardwired with a preprogrammed address. An
internal decoder determines what input
information applied to the A inputs must be low or
high to cause a low state at the Y output. 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.
DW OR NT PACKAGE
(TOP VIEW)
A1 ₁
A2 ₂
A3 ₃
A4 4
A5 5
A6 6
A7 7
A8 8
A9 9
A10 10
A11 11
GND 12
24 ^V_CC
23 ^G
22 ^Y
21 P3
20 P2
19 P1
18 P0
17 A16
16 A15
15 A14
14 A13
13 A12
This device features an enable (G) input. 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.
The SN74ALS677A is characterized for operation from 0°C to 70°C.
FUNCTION TABLE
INPUTS
OUTPUT
G P3 P2 P1 P0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16
L L L L LHHHHHHHHH H H H H H H H
L
L L L LHLHHHHHHHH H H H H H H H
L
L L LHL L LHHHHHHH H H H H H H H
L
L L LHHL L LHHHHHH H H H H H H H
L
L LHL L L L L LHHHHH H H H H H H H
L
L LHLHL L L L LHHHH H H H H H H H
L
L LHHL L L L L L LHHH H H H H H H H
L
L LHHHL L L L L L LHH H H H H H H H
L
LHLLLLLLLLLLLH H H H H H H H
L
LHLLHLLLLLLLLL H H H H H H H
L
LHLHLLLLLLLLLL L H H H H H H
L
LHLHHL L L L L L L L L L L H H H H H
L
LHHL L L L L L L L L L L L L L H H H H
L
LHHLHL L L L L L L L L L L L L H H H
L
LHHHL L L L L L L L L L L L L L L H H
L
LHHHHL L L L L L L L L L L L L L L H
L
L
All other combinations
H
H
Any combination
H
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright  1995, Texas Instruments Incorporated
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
1
• POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443