74F401 Datasheet, PDF (1/7 Pages) Fairchild Semiconductor – CRC Generator/Checker

April 1988
Revised August 1999
74F401
CRC Generator/Checker
General Description
The 74F401 Cycle Redundancy Check (CRC) Generator/
Checker provides an advanced tool for implementing the
most widely used error detection scheme in serial digital
data handling systems. A 3-bit control input selects one-of-
eight generator polynomials. The list of polynomials
includes CRC-16 and CRC-CCITT as well as their recipro-
cals (reverse polynomials). Automatic right justification is
incorporated for polynomials of degree less than 16. Sepa-
rate clear and preset inputs are provided for floppy disk
and other applications. The Error output indicates whether
or not a transmission error has occurred. Another control
input inhibits feedback during check word transmission.
The 74F401 is fully compatible with all TTL families.
Features
s Eight selectable polynomials
s Error indicator
s Separate preset and clear controls
s Automatic right justification
s Fully compatible with all TTL logic families
s 14-pin package
s 9401 equivalent
s Typical applications:
Floppy and other disk storage systems
Digital cassette and cartridge systems
Data communication systems
Ordering Code:
Order Number Package Number
Package Description
74F401SC
M14A
14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow
74F401PC
N14A
14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Symbol
Connection Diagram
© 1999 Fairchild Semiconductor Corporation DS009534
www.fairchildsemi.com