CDx4HC147, CD74HCT147 High-Speed CMOS Logic 10- to 4-Line Priority Encoder

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.”

Device Information

PART NUMBER

PACKAGE(1)

BODY SIZE (NOM)(2)

CD54HC147

J (CDIP, 16)

21.34mm × 6.92mm

CD74HC147

N (PDIP, 16)

19.31mm × 6.35mm

D (SOIC, 16)

9.90mm × 3.90mm

PW (TSSOP, 16)

5.00mm × 4.40mm

CD74HCT147

N (PDIP, 16)

19.31mm × 6.35mm

(1)

For more information, see Mechanical, Packaging, and

Orderable Information.

(2)

The body size (length × width) is a nominal value and does

not include pins.

Functional Block Diagram

CD54HC147, CD74HC147, CD74HCT147

SCHS149G – NOVEMBER 1998 – REVISED JANUARY 2025

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.