74F402 Datasheet | Fairchild Semiconductor

Description The 74F402 expandable Serial Data Polynomial generator/ checker is an expandable version of the 74F401. It provides an advanced tool for the implementation of the most widely used error detection scheme in serial digital handling systems. A 4-bit control input selects one-of-six generator polynomials. The list of polynomials includes CRC16, CRC-CCITT and Ethernet®, as well as three other standard polynomials (56th order, 48th order, 32nd 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 patible 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 systems Digital cassette and cartridge systems Data munication systems Ordering Code: Order Number 74F402PC Package Number N16E Package Description 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 .fairchildsemi. Unit Loading/Fan Out Pin Names S0- S3 CWG D/CW D ER RO CP SEI RFB MR P Note 1: Open Collector Description Polynomial Select Inputs Check Word Generate Input Serial Data/Check Word Data Input Error Output Register Output Clock Pulse Serial Expansion Input Register Feedback Master Reset Preset U.L. HIGH/LOW 1.0/0.67 1.0/0.67 285(100)/13.3(6.7) 1.0/0.67 (Note 1) /26.7(13.3) 285(100)/13.3(6.7) 1.0/0.67 1.0/0.67 1.0/0.67 1.0/0.67 1.0/0.67 Input IIH/IIL Output IOH/IOL 20 µA/- 0.4 m A 20 µA/- 0.4 m A - 5.7 m...