CD4585BE CD4585 CD-4585 4585 DIP 16 Pin IC CMOS 4-Bit Magnitude Comparator IC

Description: CD4585 IC CD 4585 DIP 16 Pin IC

The CD4585BE is a 4-bit Magnitude Comparator designed for use in computer and logic applications that require the comparison 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 CD4585B has eight comparing inputs (A3, B3, through A0, B0), three outputs (A<B, A = B, A>B) and three cascading inputs (A<B, A=B, A>B) that permit systems designers to expand the comparator function to 8, 12, 16…..4N bits. When a single CD4585B is used, the cascading inputs are connected as follows: (A<B) = low, (A=B) = high, (A>B) = high.

Pin Name	Description
A0-A3	4-bits of number A
B0-B3	4-bits of the number B
Pins 4, 5 and 6	Input pins used for cascading multiple units
(A=B) Out	HIGH if magnitude of 1st digit is equal to B0-B3 otherwise this pin is LOW
(A>B) Out	Output high, if magnitude of 1st digit is greater than B0-B3 otherwise otherwise this pin is LOW
(A<B) Out	HIGH when first number is less than second number otherwise this pin is LOW
VDD	Positive Supply
Vss	Negative Supply

CD4585 Features

• It can compare 4N bit numbers by cascading multiple ICs.
• It performs its operation at medium speed by comparing numbers in typically 180ns at 10V.
• 100% tested for quiescent current at 20 V
• It has a symmetrical output.
• Parametric ratings: 5V, 10V and 15V
• At 18V, the maximum input current is:
• 1 µA over full package temperature range
• 100 nA at 25°C
• The value of noise margin over full package temperature range for supply voltages 5V, 10V and 15V is 1V, 2V and 2.5V
• It is applicable for both Binary and BCD Code
• It has a wide Voltage Supply Range of 3 to 18 V.
• CD4585 has a capability of driving two TTL Loads of low power.

How to Use it CD4585 Comparator

In this section, we will see how this 4-bit comparator IC works. Let’s start with a comparison of 4-bit number. Although we can comparate 4N bit number. Firstly, for the comparison of two 4-bit numbers, the connections of cascading inputs are as follows:

 

• Pin4= LOW
• Pin5 = HIGH
• Pin6 = HIGH

Cascading Example

You can also compare numbers with more than 4 bits by cascading multiple devices that would expand the comparator function to 4N bits. For cascading, the cascading inputs of the least significant IC are connected to the cascading inputs of the most significant IC. The pins 4, 5, 6 of the most significant comparator are connected in the same way as in the comparison of 4-bit numbers. Suppose you want to design an 8-bit magnitude comparator. For this, you’ll have to cascade two comparators by connecting their cascading inputs in the sequence mentioned above. You can see from the diagram how to connect the cascading inputs.

 

Alternative Options

Other comparators are CD4063, CD4585B

CD4585 Applications

This IC is used in many circuits including:

• Null Detection Circuits
• Level Shifter
• Analogue to Digital Converters
• Central Processing Unit of Computers

Package includes:

• 1 x CD4585 IC CD 4585 DIP 16 Pin IC