7-1259

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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CD4585BMS

CMOS 4-Bit Magnitude Comparator

Pinout

CD4585BMS

TOP VIEW

Functional Diagram

14

15

16

9

13

12

11

10

1

2

3

4

5

7

6

8

B2

A2

(A = B)OUT

(A > B)IN

(A < B)IN

(A = B)IN

VSS

A1

VDD

B3

(A > B)OUT

(A < B)OUT

B0

A0

B1

A3

10

7

2

15

4

6

5

11

9

1

14

A0

A1

A2

A3

A > B

A = B

A < B

B0

B1

B2

B3

13

3

12

A > B

A = B

A < B

WORD “A”

CASCADING

INPUTS

WORD “B”

VDD = 16

VSS = 8

Features

• High Voltage Type (20V Rating)

• Expansion to 8, 12, 16 . . .4N Bits by Cascading Units

• Medium Speed Operation

- Compares Two 4-Bit Words in 180ns (Typ.) at 10V

• 100% Tested for Quiescent Current at 20V

• Standardized Symmetrical Output Characteristics

• 5V, 10V and 15V Parametric Ratings

• Maximum Input Current of 1

µA at 18V Over Full Pack-

• Noise Margin (Over Full Package/Temperature Range)

- 1V at VDD = 5V

- 2V at VDD = 10V

- 2.5V at VDD = 15V

• Meets All Requirements of JEDEC Tentative Standard

No. 13B, “Standard Specifications for Description of

‘B’ Series CMOS Devices”

Applications

• Servo Motor Controls

• Process Controllers

Description

CD4585BMS is a 4-bit magnitude comparator designed for

use in computer and logic applications that require the com-

parison of two 4-bit words. This logic circuit determines

whether one 4-bit word (Binary or BCD) is “less than”, “equal

to” or “greater than” a second 4-bit word.

The CD4585BMS has eight comparing inputs (A3, B3,

through A0, B0), three outputs (A < B, = B, A > B) and three

cascading inputs (A < B, A = B, A > B) that permit system

designers to expand the comparator function to 8, 12, 16 . .

.4N bits. When a single CD4585BMS is used, the cascading

inputs are connected as follows: (A < B) = low, (A = B) =

high, (A > B) = high.

Cascading thses units for comparision of more than 4 bits is

accomplished as shown in Figure 9.

The CD4585BMS is supplied in these 16-lead outline pack-

ages:

Braze Seal DIP

H4T

Frit Seal DIP

H1E

Ceramic Flatpack

H6W

December 1992

File Number

3347