Texas Instruments JM38510-34701BSA, JM38510-34701B2A, JM38510-34701BRA, SN54F521J, SN74F521N3 Datasheet

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

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.

FUNCTION TABLE

logic symbol

1

OE

2

P0

4

P1

6

P2

8

P3

11

P4

13

P5

15

P6

17

P7

3

Q0

5

Q1

7

Q2

9

Q3

12

Q4

14

Q5

16

Q6

18

Q7

INPUTS

P, Q OE

P = Q L L
P ≠ Q XH

XHH

†

0

7
0

7

OUTPUT

P = Q

COMP

P

1P = Q

Q

19

P = Q

SN54F521 ...J PACKAGE

SN74F521 . . . DW OR N PACKAGE

P1

Q1

P2

Q2

P3

(TOP VIEW)

OE

1

P0

2

Q0

3

P1

4

Q1

5

P2

6

Q2

7

P3

8
9

Q3

GND

SN54F521 . . . FK PACKAGE

10

(TOP VIEW)

Q0P0OE

3 2 1 20 19

4
5
6
7
8

9 10 11 12 13

Q3

P4

20
19
18
17
16
15
14
13
12
11

V

CC

Q4

V

CC

P = Q
Q7
P7
Q6
P6
Q5
P5
Q4
P4

18
17
16
15
14

P5 P = Q

Q7
P7
Q6
P6
Q5

GND

†

This symbol is in accordance with ANSI/IEEE Std 91-1984 and
IEC Publication 617-12.

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

Copyright  1993, Texas Instruments Incorporated

2–1

SN54F521, SN74F521
8-BIT IDENTITY COMPARATORS

SDFS091 – MARCH 1987 – REVISED OCTOBER 1993

logic diagram (positive logic)

17

P7

18

Q7

15

P6

16

Q6

13

P5

14

Q5

11

P4

12

Q4

8

P3

19

P = Q

Q3

P2

Q2

P1

Q1

P0

Q0

OE

9

6

7

4

5

2

3

1

2–2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

SN54F521, SN74F521

UNIT

PARAMETER

TEST CONDITIONS

UNIT

V

V

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, V
Input voltage range, V

Input current range –30 mA to 5 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Voltage range applied to any output in the high state –0.5 V to V

Current into any output in the low state 40 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range: SN54F521 –55°C to 125°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.

–0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CC

(see Note 1) –1.2 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

I

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SN74F521 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

recommended operating conditions

SN54F521 SN74F521

MIN NOM MAX MIN NOM MAX

V
V
V
I
I
I
T

CC
IH

IL
IK
OH
OL

A

Supply voltage 4.5 5 5.5 4.5 5 5.5 V
High-level input voltage 2 2 V
Low-level input voltage 0.8 0.8 V
Input clamp current –18 –18 mA
High-level output current –1 –1 mA
Low-level output current 20 20 mA
Operating free-air temperature –55 125 0 70 °C

†

CC

electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)

SN54F521 SN74F521

MIN TYP‡MAX MIN TYP‡MAX

V

IK

OH

V

OL

I

I

I

IH

I

IL

§

I

OS

I

‡

§
NOTE 2: ICC is measured with all inputs at 4.5 V.

CC

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.

VCC = 4.5 V, II = –18 mA –1.2 –1.2 V
VCC = 4.5 V, IOH = – 1 mA 2.5 3.4 2.5 3.4
VCC = 4.75 V, IOH = – 1 mA 2.7
VCC = 4.5 V, IOL = 20 mA 0.3 0.5 0.3 0.5 V
VCC = 5.5 V, VI = 7 V 100 100 µA
VCC = 5.5 V, VI = 2.7 V 20 20 µA
VCC = 5.5 V, VI = 0.5 V – 0.6 – 0.6 mA
VCC = 5.5 V, VO = 0 –60 –150 –60 –150 mA
VCC = 5.5 V, See Note 2 21 32 21 32 mA

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

2–3

SN54F521, SN74F521

(

)

(

)

(INPUT)

(OUTPUT)

P or Q

P

Q

ns

OE

P

Q

ns

8-BIT IDENTITY COMPARATORS

SDFS091 – MARCH 1987 – REVISED OCTOBER 1993

switching characteristics (see Note 3)

VCC = 5 V,
CL = 50 pF,

PARAMETER

t

PLH

t

PHL

t

PLH

t
†
NOTE 3: Load circuits and waveforms are shown in Section 1.

PHL

For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.

FROM

INPUT

TO

OUTPUT

=

=

RL = 500 Ω,
TA = 25°C

′F521 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

VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 500Ω,
TA = MIN to MAX

†

UNIT

2–4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

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