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HCF40147BC1 Datasheet

  • HCF40147BC1

  • 10 TO 4 LINE BCD PRIORITY ENCODER

  • 277.92KB

  • 12頁(yè)

  • STMICROELECTRONICS   STMICROELECTRONICS

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HCC40147B
HCF40147B
10 TO 4 LINE BCD PRIORITY ENCODER
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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
碌A(chǔ)
AT 18V
OVER FULL PACKAGE TEMPERATURE
o
RANGE; 100 nA AT 18 V AND 25 C
NOISE MARGIN (FULL PACKAGE TEMPERA-
TURE RANGE): 1V AT V
DD
= 5V, 2V AT
V
DD
= 10V, 2.5V AT V
DD
= 15V
EY
(Plastic Package)
F
(Ceramic Package)
APPLICATIONS:
KEYBOARD ENCODING
10 LINE TO BCD ENCODING
RANGE SELECTION
M1
(Micro Package)
C1
(Chip Carrier)
ORDER CODES :
HCC40147BF
HCF40147BM1
HCF40147BEY
HCF40147BC1
PIN CONNECTIONS
DESCRIPTION
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.
April 1991
1/12

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