TI SN74F521N

SN54F521, SN74F521
8-BIT IDENTITY COMPARATORS
SDFS091 – MARCH 1987 – REVISED OCTOBER 1993
Compares Two 8-Bit Words
Package Options Include Plastic
Small-Outline Packages, Ceramic Chip
Carriers, and Standard Plastic and Ceramic
300-mil DIPs
SN54F521 . . . J PACKAGE
SN74F521 . . . DW OR N PACKAGE
(TOP VIEW)
OE
P0
Q0
P1
Q1
P2
Q2
P3
Q3
GND
description
These identity comparators perform comparisons
on two 8-bit binary or BCD words. They provide
P = Q outputs.
The SN54F521 is characterized for operation over
the full military temperature range of – 55°C to
125°C. The SN74F521 is characterized for
operation from 0°C to 70°C.
INPUTS
P=Q
L
L
P≠Q
X
H
X
H
H
P1
Q1
P2
Q2
P3
logic symbol†
P0
P1
P2
P3
P4
P5
P6
P7
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
2
19
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
VCC
P=Q
Q7
P7
Q6
P6
Q5
P5
Q4
P4
4
3 2 1 20 19
18
5
17
6
16
7
15
8
14
9 10 11 12 13
Q7
P7
Q6
P6
Q5
Q3
GND
P4
Q4
P5
COMP
1
OE
2
Q0
P0
OE
VCC
OUTPUT
P=Q
OE
20
SN54F521 . . . FK PACKAGE
(TOP VIEW)
FUNCTION TABLE
P, Q
1
P=Q
•
•
0
4
6
8
11
P
13
15
17
3
7
1P = Q
0
19
P=Q
5
7
9
12
Q
14
16
18
7
† This symbol is in accordance with ANSI/IEEE Std 91-1984 and
IEC Publication 617-12.
Copyright  1993, Texas Instruments Incorporated
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.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
2–1
SN54F521, SN74F521
8-BIT IDENTITY COMPARATORS
SDFS091 – MARCH 1987 – REVISED OCTOBER 1993
logic diagram (positive logic)
P7
Q7
P6
Q6
P5
Q5
P4
Q4
17
18
15
16
13
14
11
12
19
P3
Q3
P2
Q2
P1
Q1
P0
Q0
OE
2–2
8
9
6
7
4
5
2
3
1
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
P=Q
SN54F521, SN74F521
8-BIT IDENTITY COMPARATORS
SDFS091 – MARCH 1987 – REVISED OCTOBER 1993
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to 7 V
Input voltage range, VI (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 1.2 V to 7 V
Input current range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 30 mA to 5 mA
Voltage range applied to any output in the high state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to VCC
Current into any output in the low state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 mA
Operating free-air temperature range: SN54F521 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 55°C to 125°C
SN74F521 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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.
NOTE 1: The input voltage ratings may be exceeded provided the input current ratings are observed.
recommended operating conditions
SN54F521
VCC
VIH
Supply voltage
VIL
IIK
Low-level input voltage
IOH
IOL
High-level output current
Low-level output current
TA
Operating free-air temperature
High-level input voltage
SN74F521
MIN
NOM
MAX
MIN
NOM
MAX
4.5
5
5.5
4.5
5
5.5
2
2
Input clamp current
– 55
UNIT
V
V
0.8
0.8
V
– 18
– 18
mA
–1
–1
mA
20
20
mA
70
°C
125
0
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
VIK
VOH
VOL
II
IIH
IIL
IOS§
ICC
TEST CONDITIONS
VCC = 4.5 V,
VCC = 4.5 V,
II = – 18 mA
IOH = – 1 mA
VCC = 4.75 V,
VCC = 4.5 V,
IOH = – 1 mA
IOL = 20 mA
VCC = 5.5 V,
VCC = 5.5 V,
VI = 7 V
VI = 2.7 V
VCC = 5.5 V,
VCC = 5.5 V,
VI = 0.5 V
VO = 0
SN54F521
TYP‡
MAX
MIN
SN74F521
TYP‡
MAX
MIN
– 1.2
2.5
3.4
– 1.2
2.5
3.4
0.5
0.3
0.5
V
100
100
µA
20
20
µA
– 0.6
– 60
– 150
– 60
VCC = 5.5 V,
See Note 2
21
32
21
‡ All typical values are at VCC = 5 V, TA = 25°C.
§ Not more than one output should be shorted at a time, and the duration of the short circuit should not exceed one second.
NOTE 2: ICC is measured with all inputs at 4.5 V.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
V
V
2.7
0.3
UNIT
– 0.6
mA
– 150
mA
32
mA
2–3
SN54F521, SN74F521
8-BIT IDENTITY COMPARATORS
SDFS091 – MARCH 1987 – REVISED OCTOBER 1993
switching characteristics (see Note 3)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 5 V,
CL = 50 pF,
RL = 500 Ω,
TA = 25°C
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 500 Ω,
TA = MIN to MAX†
′F521
tPLH
tPHL
P or Q
P=Q
tPLH
tPHL
OE
P=Q
SN54F521
SN74F521
MIN
TYP
MAX
MIN
MAX
MIN
MAX
2.7
6.6
10
2.7
14
2.7
11
3.7
6.6
10
3.2
12
3.2
11
2.2
4.6
6.5
2.2
8.5
2.2
7.5
2.7
6.1
9
2.7
13.5
2.7
10
† For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
NOTE 3: Load circuits and waveforms are shown in Section 1.
2–4
POST OFFICE BOX 655303
UNIT
• DALLAS, TEXAS 75265
ns
ns
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