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1 Features

? Buffered inputs and outputs

? Typical propagation delay: 13ns at VCC = 5V, CL =

15pF, TA = 25oC

? Fanout (over temperature range)

– Bus driver outputs: 15 LSTTL loads

? Wide operating temperature range: -55oC to 125oC

? Balanced propagation delay and transition times

? Significant power reduction compared to LSTTL

logic ICs

? HC types

– 2V to 6V Operation

– High noise immunity: NIL = 30%, NIH = 30% of

VCC at VCC = 5V

? HCT types

– 4.5V to 5.5V Operation

– Direct LSTTL input logic compatibility, VIL= 0.8V

(Max), VIH = 2V (Min)

– CMOS input compatibility, Il ≤ 1μA at VOL, VOH

2 Description

The CDx4HC147 and CD74HCT147 are 9-input

priority encoders. These devices provide the 10-line to

4-line priority encoding function by use of the implied

decimal “zero.”