TLF9535

January 1995

54F74F402 Serial Data Polynomial

GeneratorChecker

General Description

The ’F402 expandable Serial Data Polynomial generator

checker is an expandable version of the ’F401 It provides

an advanced tool for the implementation of the most widely

used error detection scheme in serial digital handling sys-

tems A 4-bit control input selects one-of-six generator poly-

nomials The list of polynomials includes CRC-16 CRC-

CCITT and Ethernet

as well as three other standard poly-

and preset inputs are provided for floppy disk and other

applications The Error output indicates whether or not a

transmission error has occurred The CWG Control input

inhibits feedback during check word transmission

The

’F402 is compatible with FAST

devices and with all TTL

families

Features

Y

Guaranteed 30 MHz data rate

Y

Six selectable polynomials

Y

Other polynomials available

Y

Separate preset and clear controls

Y

Expandable

Y

Automatic right justification

Y

Error output open collector

Y

Typical applications

Floppy and other disk storage systems

Digital cassette and cartridge systems

Data communication systems

Commercial

Military

Package

Package Description

Number

74F402PC

N16E

16-Lead (0300 Wide) Molded Dual-In-Line

54F402DM (Note 1)

J16A

16-Lead Ceramic Dual-In-Line

54F402FM (Note 1)

W16A

16-Lead Cerpack

54F402LM (Note 1)

E20A

20-Lead Ceramic Leadless Chip Carrier Type C

Note 1

Logic Symbol

Connection Diagrams

TLF9535 – 4

Pin Assignment

for DIP SOIC and Flatpak

TLF9535 – 1

Pin Assignment

for LCC

TLF9535 – 2

TRI-STATE

is a registered trademark of National Semiconductor Corporation

Ethernet

is a registered trademark of Xerox Corporation

C1995 National Semiconductor Corporation

RRD-B30M105Printed in U S A