DP8404 - National Semiconductor

DP8404 Error Detection and Correction Circuits

The DP8402A DP8403 DP8404 and DP8405 devices are 32-bit parallel error detection and correction circuits (EDACs) in 52-pin DP8402A and DP8403 or 48-pin DP8404 and DP8405 600-mil packages The EDACs use a modified Hamming code to generate a 7-bit check word from a 32-bit data word This check word is stored along with the data word during the memory write cycle.

Features

Y Detects and corrects single-bit errors Y Detects and flags double-bit errors Y Built-in diagnostic capability Y Fast write and read cycle processing times Y Byte-write capability DP8402A and DP8403 Y Fully pin and function compatible with TI’s SN74ALS632A thru SN74ALS635 series System Environment TL F 8535
  – 1 TRI-STATE is a registered trademark of National Semiconductor Corp C1995 National Semiconductor Corporation TL F 8535 RRD-B30M105 Printed in U S A Simplified Functional Block and Connection Diagrams Obsolete Device DP8402A DP8403 DP8404 DP8405 Package 52-pin 52-pin 48-pin 48-pi.