Philips N74F521D, N74F521N Datasheet

INTEGRATED CIRCUITS

74F521

8-bit identity comparator

Product specification
IC15 Data Handbook

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1990 May 15

Philips Semiconductors Product specification

74F5218-bit identity comparator

FEA TURES

PIN CONFIGURATION

•Compares two 8-bit words in 6.5ns typical

•Expandable to any word length

DESCRIPTION

The 74F521 is an expandable 8-bit comparator. It compares two
words of up to 8 bits each and provides a Low output when the two
words match bit for bit. The expansion input I
active-Low enable input.

TYPICAL

TYPE

PROPAGATION

DELA Y

74F521 7.0ns 24mA

ORDERING INFORMA TION

DESCRIPTION

20-pin plastic DIP N74F521N SOT146-1

20-pin plastic SOL N74F521D SOT163-1

INPUT AND OUTPUT LOADING AND FAN-OUT TABLE

PINS DESCRIPTION 74F (U.L.) HIGH/LOW LOAD VALUE HIGH/LOW

A0 – A7 Word A inputs 1.0/1.0 20µA/0.6mA
B0 – B7 Word B inputs 1.0/1.0 20µA/0.6mA

I

A=B

Q

A=B

NOTE: One (1.0) FAST unit load is defined as: 20µA in the High state and 0.6mA in the Low state.

Expansion or Enable input (active Low) 1.0/1.0 20µA/0.6mA
Identity output (active Low) 50/33 1.0mA/20mA

also serves as an

A=B

TYPICAL

SUPPLY CURRENT

(TOTAL)

COMMERCIAL RANGE

VCC = 5V ±10%, T

= 0°C to +70°C

amb

I

GND

1

A=B

2

A0

3

B0

4

A1

5

B1

6

A2

7

B2

8

A3

9

B3

10 11

20
19
18
17
16
15
14
13
12

SF00273

PKG DWG #

V

CC

Q

A=B

B7
A7
B6
A6
B5
A5
B4

A4

LOGIC SYMBOL

1

I

A=B

2
3
4
5
6
7
8
9

11
12
13

14
15

16
17
18

VCC = Pin 20
GND = Pin 10

May 15, 1990 853–0372 99601

A0
B0
A1
B1
A2
B2
A3
B3
A4
B4
A5
B5
A6
B6
A7
B7

Q

A=B

19

SF00274

IEC/IEEE SYMBOL

2

2
4
6
8
11
13
15
17

3
5
7
9
12
14
15
18

1

0

3

0

7

EN

COMP

A

B

A=B

19

SF00275

Philips Semiconductors Product specification

74F5218-bit identity comparator

LOGIC DIAGRAM

2

A0

3

B0

4

A1

5

B1

6

A2

7

B2

8

A3

9

B3

11

A4

12

B4

13

A5

14

B5

15

A6

16

B6

17

A7

18

B7

1

I

A=B

VCC = Pin 20
GND = Pin 10

19

Q

SF00276

A=B

FUNCTION TABLE

INPUTS OUTPUT

I

A=B

L A=B* L

L A≠B H
H A=B* H
H A≠B H

H = High voltage level
L = Low voltage level
X = Don’t care
* A0=B0, A1=B1, A2=B2, etc.

A, B Q

A=B

APPLICATIONS

ENABLE
LOW

ENABLE
LOW

A0 B0 A7 B7

I

A=B

Q

A=B

A0 B0 A7 B7

I

A=B

Q

A=B

A8 B8 A15 B15

I

A=B

Q

A=B

RIPPLE EXPANSION

A8 B8 A15 B15

I

A=B

Q

A=B

A16 B16 A23 B23

I

A=B

Q

A=B

A16 B16 A23 B23

I

A=B

Q

A=B

May 15, 1990

PARALLEL EXPANSION

3

SF00277