HCC40147B

HCF40147B

April 1991

10 TO 4 LINE BCD PRIORITY ENCODER

EY

(Plastic Package)

DESCRIPTION

ORDER CODES :

HCC40147BF

HCF40147BM1

HCF40147BEY

HCF40147BC1

F

(Ceramic Package)

M1

(Micro Package)

C1

(Chip Carrier)

PIN CONNECTIONS

.

ENCODES 10 LINE TO 4 LINE BCD

.

ACTIVE LOW INPUTS AND OUTPUTS

.

STANDARDIZED, SYMMETRICAL OUTPUT

CHARACTERIZATION

.

100 % TESTED FOR QUIESCENT CURRENT

AT 20 V

.

5V, 10V AND 15V PARAMETRIC RATINGS

.

MAXIMUM INPUT CURREENT OF 1

µA AT 18V

OVER

FULL

PACKAGE

TEMPERATURE

RANGE; 100 nA AT 18 V AND 25

.

NOISE MARGIN (FULL PACKAGE TEMPERA-

APPLICATIONS:

.

KEYBOARD ENCODING

.

10 LINE TO BCD ENCODING

.

RANGE SELECTION

The HCC/HCF40147B 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

HCC/HCFF40147 is functionally similar to

the

T54/T74LS147 if pin 15 is tied low.

The HCC/HCF40147B types are supplied in 16 lead

plastic or ceramic and plastic micropackage.

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