74F402 Datasheet, PDF (1/9 Pages) Fairchild Semiconductor – Serial Data Polynomial Generator/Checker

April 1988
Revised August 1999
74F402
Serial Data Polynomial Generator/Checker
General Description
The 74F402 expandable Serial Data Polynomial generator/
checker is an expandable version of the 74F401. It pro-
vides an advanced tool for the implementation of the most
widely used error detection scheme in serial digital han-
dling systems. A 4-bit control input selects one-of-six gen-
erator polynomials. The list of polynomials includes CRC-
16, CRC-CCITT and Ethernet®, as well as three other
standard polynomials (56^th order, 48^th order, 32^nd order).
Individual clear 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 74F402 is compatible with FAST®
devices and with all TTL families.
Features
s Guaranteed 30 MHz data rate
s Six selectable polynomials
s Other polynomials available
s Separate preset and clear controls
s Expandable
s Automatic right justification
s Error output open collector
s Typical applications: Floppy and other disk storage sys-
tems Digital cassette and cartridge systems Data com-
munication systems
Ordering Code:
Order Number Package Number
Package Description
74F402PC
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Logic Symbol
Connection Diagram
FAST® is a registered trademark of Fairchild Semiconductor Corporation.
Ethernet® is a registered trademark of Xerox Corporation.
© 1999 Fairchild Semiconductor Corporation DS009535
www.fairchildsemi.com