© Semiconductor Components Industries, LLC, 2009

September, 2009 − Rev. 7

1

Publication Order Number:

MC14521B/D

MC14521B

24-Stage Frequency Divider

The MC14521B consists of a chain of 24 flip−flops with an input

circuit that allows three modes of operation. The input will function as a

crystal oscillator, an RC oscillator, or as an input buffer for an external

oscillator. Each flip−flop divides the frequency of the previous flip−flop

count advances on the negative going edge of the clock. The outputs of

the last seven−stages are available for added flexibility.

Features

Loads

Allow the Connection of External Resistors for Low−Power Operation

Schottky TTL Load over the Rated Temperature Range

Parameter

Symbol

Value

Unit

DC Supply Voltage Range

−0.5 to +18.0

V

Input or Output Voltage Range

(DC or Transient)

+0.5

V

Input or Output Current (DC or Transient)

per Pin

±10

mA

Power Dissipation, per Package (Note 1)

500

mW

Ambient Temperature Range

−55 to +125

°C

Storage Temperature Range

−65 to +150

°C

Lead Temperature (8−Second Soldering)

260

°C

Stresses exceeding Maximum Ratings may damage the device. Maximum

Ratings are stress ratings only. Functional operation above the Recommended

Operating Conditions is not implied. Extended exposure to stresses above the

Recommended Operating Conditions may affect device reliability.

1. Temperature Derating: Plastic “P and D/DW”

Packages: – 7.0 mW/_C From 65_C To 125_C

This device contains protection circuitry to guard against damage due to high

static voltages or electric fields. However, precautions must be taken to avoid

applications of any voltage higher than maximum rated voltages to this

Unused inputs must always be tied to an appropriate logic voltage level

*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

See detailed ordering and shipping information in the package

dimensions section on page 2 of this data sheet.

ORDERING INFORMATION

A

= Assembly Location

WL, L

= Wafer Lot

YY, Y

= Year

WW, W = Work Week

G

= Pb−Free Package

MARKING

DIAGRAMS

PDIP−16

P SUFFIX

CASE 648

SOIC−16

D SUFFIX

CASE 751B

1

16

14521BG

AWLYWW

SOEIAJ−16

F SUFFIX

CASE 966

1

16

MC14521B

ALYWG

16

1

MC14521BCP

AWLYYWWG

1

1

1