© Semiconductor Components Industries, LLC, 2005

June, 2005 − Rev. 3

1

Publication Order Number:

MC74HC390A/D

MC74HC390A

Dual 4−Stage Binary Ripple

Counter with

÷ 2 and ÷ 5

Sections

High−Performance Silicon−Gate CMOS

The MC74HC390A is identical in pinout to the LS390. The device

inputs are compatible with standard CMOS outputs; with pullup

resistors, they are compatible with LSTTL outputs.

This device consists of two independent 4−bit counters, each

composed of a divide−by−two and a divide−by−five section. The

divide−by−two and divide−by−five counters have separate clock

inputs, and can be cascaded to implement various combinations of

÷ 2

and/or

÷ 5 up to a ÷ 100 counter.

Flip−flops internal to the counters are triggered by high−to−low

transitions of the clock input. A separate, asynchronous reset is

provided for each 4−bit counter. State changes of the Q outputs do not

occur simultaneously because of internal ripple delays. Therefore,

decoded output signals are subject to decoding spikes and should not

be used as clocks or strobes except when gated with the Clock of the

HC390A.

Features

No 7A

*For additional information on our Pb−Free strategy and soldering details, please

download the ON Semiconductor Soldering and Mounting Techniques

Reference Manual, SOLDERRM/D.

http://onsemi.com

MARKING

DIAGRAMS

SOIC−16

D SUFFIX

CASE 751B

TSSOP−16

DT SUFFIX

CASE 948F

1

16

PDIP−16

N SUFFIX

CASE 648

1

16

1

16

1

16

MC74HC390AN

AWLYYWWG

1

16

HC390AG

AWLYWW

HC

390A

ALYW

G

G

1

16

A

= Assembly Location

L, WL

= Wafer Lot

Y, YY

= Year

W, WW

= Work Week

G

= Pb−Free Package

G

= Pb−Free Package

(Note: Microdot may be in either location)

See detailed ordering and shipping information in the package

dimensions section on page 2 of this data sheet.

ORDERING INFORMATION

1

16

74HC390A

ALYWG

SOEIAJ−16

F SUFFIX

CASE 966

1

16