10 TO 4 LINE BCD PRIORITY ENCODER
Description
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 µA AT 18V OVER FULL PACKAGE TEMPERATURE o RANGE; 100 nA AT 18 V AND 25 C NOISE MARGIN (FULL PACKAGE TEMPERATURE RANGE): 1V AT VDD = 5V, 2V AT VDD = 10V, 2.
5V AT VDD = 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
HCC/HCF40147B
ABSOLUTE MAXIMUM RATING
Symbol VDD * Vi II Ptot Parameter Supply Voltage: HCC Types HCF Types Input Voltage DC Input Current (any one input) Total Power Dissipation (per package) Dissipation per Output Transistor for Top = Full Package Temperature Range Operating Temperature: HCC Types HCF Types Storage Temperature Value -0.
5 to +20 -0.
5 to +18 -0.
5 to VDD + 0.
5 ± 10 200 100 -55 to +125 -40 to +85 -65 to +150 Unit V V V mA mW mW
o o o
Top Tstg
C C C
Stresses above those listed under ”Absolute Maximum Ratings” may cause permanent damage to the device.
This is a stress ratingonly and functional operation of the device at these or any other conditions above those ...
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