CD4532 8-Bit Priority Encoder

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CD4532BMS consists of combinational logic that encodes the highest priority input (D7 – D0) to a 3-bit binary code. The eight inputs, D7 through D0, each have an assigned priority; D7 is the highest priority and D0 is the lowest. The output of the IC always comes in TTL which makes it easy to work with other TTL devices and microcontrollers. The CD4532 is supplied in these 16-lead outline packages

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What is Encoder?

Simply speaking, a priority encoder is a type of encoder that improves upon the design of a simple encoder. It is, in a sense, the dual or opposite of a decoder. A priority encoder provides ‘n’ bits of binary coded output representing the position of the highest order active input of 2ⁿ inputs. If two or more inputs are high at the same time, the input having the highest priority will take precedence.

CD4532 Key Features

High Voltage Type (20V Rating)
Converts From 1 of 8 to Binary
Provides Cascading Feature to Handle Any Number of Inputs
Group Select Indicates One or More Priority Inputs
Standardized Symmetrical Output Characteristics
100% Tested for Quiescent Current at 20V
Maximum Input Current of 1µA at 18V Over Full Package Temperature Range; 100nA at 18V and +25oC
Noise Margin (Over Full Package/Temperature Range)
- 0.5V at VDD = 5V
- 1.5V at VDD = 10V
- 1.5V at VDD = 15V
5V, 10V and 15V Parametric Ratings

CD4532 Pinout

Pin No	Pin Name	Description
1	D4	data input pin 4
2	D5	data input pin 5
3	D6	data input pin 6
4	D7	data input pin 7
5	EI	ENABLE input pin
6	Q2	output pin 2
7	Q1	output pin 1
8	VSS	source supply
9	Q0	output pin 0
10	D0	data input pin 0
11	D1	data input pin 1
12	D2	data input pin 2
13	D3	data input pin 3
14	GS	group select lines
15	E0	enable out pin
16	VDD	drain supply

Application

Priority encoders can be used to convert the rotary or angular position of a compass to a digital code, so that it can be used for navigational purposes.
Floating Point Arithmetic