74F401 FAIRCHILD [Fairchild Semiconductor], 74F401 Datasheet

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74F401

Manufacturer Part Number
74F401
Description
CRC Generator/Checker
Manufacturer
FAIRCHILD [Fairchild Semiconductor]
Datasheet
© 1999 Fairchild Semiconductor Corporation
74F401SC
74F401PC
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.
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Symbol
Order Number
Package Number
M14A
N14A
14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow
14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
DS009534
Features
Connection Diagram
Eight selectable polynomials
Error indicator
Separate preset and clear controls
Automatic right justification
Fully compatible with all TTL logic families
14-pin package
9401 equivalent
Typical applications:
Floppy and other disk storage systems
Digital cassette and cartridge systems
Data communication systems
Package Description
April 1988
Revised August 1999
www.fairchildsemi.com

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74F401 Summary of contents

Page 1

... 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. Ordering Code: Order Number Package Number ...

Page 2

... To check an incoming message for errors, both the data and check bits are entered through the D input with the CWE input held HIGH. The 74F401 is not in the data path, but only monitors the message. The Error Output becomes valid after the last check bit has been entered into the 74F401 by a HIGH-to-LOW transition of CP ...

Page 3

... FIGURE 1. Equivalent Circuit for X FIGURE 2. Check Word Generation Note 1: Check word Enable is HIGH while data is being clocked, LOW while transmission of check bits. Note 2: 74F401 must be reset or preset before each computation. Note 3: CRC check bits are generated and appended to data bits ...

Page 4

Absolute Maximum Ratings Storage Temperature Ambient Temperature under Bias Junction Temperature under Bias V Pin Potential to Ground Pin CC Input Voltage (Note 5) Input Current (Note 5.0 mA Voltage Applied to Output in HIGH State ...

Page 5

AC Electrical Characteristics Symbol Parameter f Maximum Clock Frequency MAX t Propagation Delay PLH PHL t Propagation Delay PHL Propagation Delay PLH Propagation Delay PHL ...

Page 6

Physical Dimensions inches (millimeters) unless otherwise noted 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow www.fairchildsemi.com Package Number M14A 6 ...

Page 7

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right ...

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