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SN74ALS679
12-BIT ADDRESS COMPARATOR
SDAS003C – JUNE 1982 – REVISED JANUARY 1995
•
•
12-Bit Address Comparator With Enable
Package Options Include Plastic
Small-Outline (DW) Packages and Standard
Plastic (N) 300-mil DIPs
DW OR N PACKAGE
(TOP VIEW)
description
This 12-bit address comparator simplifies
5
16
addressing of memory boards and/or other
6
15
peripheral devices. The four P inputs are normally
7
14
hardwired with a preprogrammed address. An
8
13
internal decoder determines what input
9
12
information applied to the A inputs must be low or
10
11
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 A12 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.
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 SN74ALS679 is characterized for operation from 0°C to 70°C.
FUNCTION TABLE
INPUTS
G
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
H
P3
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
P2
L
L
L
L
H
H
H
H
L
L
L
L
H
H
H
H
P1
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
P0
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
A1
H
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
A2
H
H
L
L
L
L
L
L
L
L
L
L
L
L
L
L
A3
H
H
H
L
L
L
L
L
L
L
L
L
L
L
L
L
A4
H
H
H
H
L
L
L
L
L
L
L
L
L
L
L
L
A5
H
H
H
H
H
L
L
L
L
L
L
L
L
L
L
L
A6
H
H
H
H
H
H
L
L
L
L
L
L
L
L
L
L
A7
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
L
A8
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
A9
H
H
H
H
H
H
H
H
H
L
L
L
H
L
L
L
A10
H
H
H
H
H
H
H
H
H
H
L
L
H
H
L
L
A11
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
L
A12
H
H
H
H
H
H
H
H
H
H
H
H
L
L
L
L
OUTPUT
Y
L
L
L
L
L
L
L
L
L
L
L
L
L†
L†
L†
L
H
H
A1
A2
A3
A4
A5
A6
A7
A8
A9
GND
1
2
3
4
20
19
18
17
V
CC
G
Y
P3
P2
P1
P0
A12
A11
A10
All other combinations
Any combination
† The three shaded rows of the function table show combinations that would normally not be used in address
comparator applications. The logic symbols above are not valid for these combinations in which P = 12, 13, and 14.
If symbols valid for all combinations are required, starting with the fourth exclusive-OR from the bottom, change P
≥
9
to P = 9 . . . 11/13 . . . 15, P
≥
10 to P = 10/11/14/15, and P
≥
11 to P = 11/15.
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
SN74ALS679
12-BIT ADDRESS COMPARATOR
SDAS003C – JUNE 1982 – REVISED JANUARY 1995
logic symbol
†
[ADDRESS COMP]
[P assumed
≠
12, 13, 14]
EN
0
P
3
Z1
Z2
Z3
Z4
Z5
Z6
Z7
Z8
Z9
Z10
Z11
Z12
P
≥
1
1
P
≥
2
2
P
≥
3
3
P
≥
4
4
P
≥
5
5
P
≥
6
6
P
≥
7
7
P
≥
8
8
P
≥
9
9
P
≥
10
10
P
≥
11
11
P
≥
12
12
=1
=1
=1
=1
=1
=1
=1
=1
=1
=1
=1
=1
18
Y
&
19
G
P0
P1
P2
P3
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
14
15
16
17
1
2
3
4
5
6
7
8
9
11
12
13
† This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
2
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•
DALLAS, TEXAS 75265
SN74ALS679
12-BIT ADDRESS COMPARATOR
SDAS003C – JUNE 1982 – REVISED JANUARY 1995
logic diagram (positive logic)
A1
1
A2
2
A3
3
A4
4
A5
5
A6
6
A7
7
A8
8
18
Y
A9
9
A10
11
A11 12
A12
P0
P1
P2
P3
13
14
15
16
17
G 19
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3
SN74ALS679
12-BIT ADDRESS COMPARATOR
SDAS003C – JUNE 1982 – REVISED JANUARY 1995
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Input voltage, V
I
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Operating free-air temperature range, T
A
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 65°C to 150°C
† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
recommended operating conditions
MIN
VCC
VIH
VIL
IOH
IOL
TA
Supply voltage
High-level input voltage
Low-level input voltage
High-level output current
Low-level output current
Operating free-air temperature
0
4.5
2
0.8
– 2.6
24
70
NOM
5
MAX
5.5
UNIT
V
V
V
mA
mA
°C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
VIK
VOH
VOL
II
IIH
IIL
IO§
TEST CONDITIONS
VCC = 4.5 V,
VCC = 4.5 V to 5.5 V,
VCC = 4.5 V,
VCC = 4 5 V
4.5
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
II = – 18 mA
IOH = – 0.4 mA
IOH = – 2.6 mA
IOL = 12 mA
IOL = 24 mA
VI = 7 V
VI = 2.7 V
VI = 0.4 V
VO = 2.25 V
– 30
MIN
VCC – 2
2.4
TYP‡
MAX
– 1.5
3.2
0.25
0.35
0.4
0.5
0.1
20
– 0.1
–112
UNIT
V
V
V
mA
µA
mA
mA
ICC
VCC = 5.5 V
17
28
mA
‡ All typical values are at VCC = 5 V, TA = 25°C.
§ The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.
switching characteristics (see Figure 2)
FROM
(INPUT)
TO
(OUTPUT)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 500
Ω,
TA = MIN to MAX¶
MIN
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
Any P
Any A
G
4
Y
Y
Y
8
5
5
3
5
MAX
25
35
22
30
13
25
ns
ns
ns
PARAMETER
UNIT
¶ For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
4
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•
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