7-71

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

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CD40147BMS

10 Line to 4 Line BCD Priority Encoder

Pinout

CD40147BMS

TOP VIEW

Functional Diagram

14

15

16

9

13

12

11

10

1

2

3

4

5

7

6

8

4

5

6

7

8

C

VSS

B

VDD

D

3

2

1

9

A

0

BCD

ENCODER

PRIORITY

SELECT

9

0

Features

• High Voltage Type (20V Rating)

• Encodes 10 Line to 4 Line BCD

• Active Low Inputs and Outputs

• 100% Tested for Quiescent Current at 20V

• 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

• Standardized Symmetrical Output Characteristics

• Meets All Requirements of JEDEC Tentative Standard

No. 13B, “Standard Specifications for Description of

‘B’ Series CMOS Devices”

Applications

• Keyboard Encoding

• 10 Line to BCD Encoding

• Range Selection

Description

CD40147BMS CMOS encoder features priority encoding of

the inputs to ensure that only the highest order data line is

encoded. Ten data input lines (0-9) are encoded to four line (8,

4, 2, 1) BCD. The highest priority line is line 9. All four output

lines are logic 1 (VSS) when all input lines are logic 0. All

inputs and outputs are buffered, and each output can drive

one TTL low power Schottky load. The CD40147BMS is func-

tionally similar to the TTL 54/74147 if pin 15 is tied low.

The CD40147BMS is supplied in these 16-lead outline

packages:

Braze Seal DIP

H4T

Frit Seal DIP

H1E

Ceramic Flatpack

H6W

December 1992

File Number

3357