HCF40147B

Features:

`ENCODES 10 LINE TO 4 LINE BCD
`ACTIVELOW INPUTS AND OUTPUTS
`STANDARDIZED, SYMMETRICAL OUTPUT CHARACTERIZATION
`100 % TESTED FOR QUIESCENT CURRENT AT 20 V
`5V, 10V AND 15V PARAMETRIC RATINGS
`MAXIMUMINPUT CURREENT OF 1 mA AT 18V OVER FULL PACKAGE TEMPERATURE RANGE; 100 nA AT 18 V AND 25
`NOISE MARGIN (FULL PACKAGE TEMPERATURE RANGE): 1V AT VDD = 5V, 2V AT VDD = 10V, 2.5V AT VDD = 15V


Application

·KEYBOARD ENCODING
·10 LINE TO BCD ENCODING
·RANGE SELECTION


Pinout




Specifications

Symbol	Parameter	Value	Unit
VDD *	Supply Voltage: HCC Types HCF Types	-0.5 to +20 -0.5 to +18	V V
Vi	Input Voltage	-0.5 to VDD + 0.5	V
II	DC Input Current (any one input)	± 10	mA
Ptot	Total Power Dissipation (per package) Dissipation per Output Transistor for Top = Full Package Temperature Range	200 100	mW mW
Top	Operating Temperature: HCC Types HCF Types	-55 to +125 -40 to +85
Tstg	Storage Temperature	-65 to +150

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/HCF40147B  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.