- CY7C421-15DMB
- Cypress Semiconductor
- FIFO Mem Async Dual Depth/Width Uni-Dir 512 x 9 28-Pin CDIP
- CY7C421-15DMBT
- Cypress Semiconductor
- FIFO Mem Async Dual Depth/Width Uni-Dir 512 x 9 28-Pin CDIP T/R
- CY7C421-15DMBXT
- Cypress Semiconductor
- FIFO Mem Async Dual Depth/Width Uni-Dir 512 x 9 28-Pin CDIP T/R