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.
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.
No. | Partie # | Fabricant | Description | Fiche Technique |
---|---|---|---|---|
1 | DP8402A |
National Semiconductor |
Error Detection and Correction Circuits | |
2 | DP8404 |
National Semiconductor |
Error Detection and Correction Circuits | |
3 | DP8405 |
National Semiconductor |
Error Detection and Correction Circuits | |
4 | DP8406 |
National Semiconductor |
32-Bit Parallel Error Detection and Correction Circuit | |
5 | DP8417 |
National Semiconductor |
(DP8417 - DP8419) 64k / 256k Dynamic RAM Controller/Drivers | |
6 | DP8418 |
National Semiconductor |
(DP8417 - DP8419) 64k / 256k Dynamic RAM Controller/Drivers | |
7 | DP8419 |
National Semiconductor |
(DP8417 - DP8419) 64k / 256k Dynamic RAM Controller/Drivers | |
8 | DP8420A |
National Semiconductor |
(DP8420A - DP8422A) microCMOS Programmable 256k/1M/4M Dynamic RAM Controller/Drivers | |
9 | DP8420V |
National Semiconductor |
microCMOS Programmable 256k/1M/4M Dynamic RAM Controller/Drivers | |
10 | DP8421A |
National Semiconductor |
(DP8420A - DP8422A) microCMOS Programmable 256k/1M/4M Dynamic RAM Controller/Drivers | |
11 | DP8421V |
National Semiconductor |
microCMOS Programmable 256k/1M/4M Dynamic RAM Controller/Drivers | |
12 | DP8422A |
National Semiconductor |
(DP8420A - DP8422A) microCMOS Programmable 256k/1M/4M Dynamic RAM Controller/Drivers |