CY7C421

Document Number: 38-06001 Rev. *H

Page 3 of 21

Contents

Pin Configurations ........................................................... 4

Pin Definitions .................................................................. 5

Maximum Ratings ............................................................. 6

Operating Range ............................................................... 6

Electrical Characteristics ................................................. 6

Electrical Characteristics ................................................. 6

Capacitance ...................................................................... 6

AC Test Loads and Waveforms ....................................... 7

Switching Characteristics ................................................ 8

Switching Waveforms ...................................................... 9

Architecture .................................................................... 13

Dual-Port RAM .......................................................... 13

Resetting the FIFO .................................................... 13

Writing Data to the FIFO ........................................... 13

Reading Data from the FIFO ..................................... 13

Standalone/Width Expansion Modes ........................ 13

Depth Expansion Mode ............................................. 13

Use of the Empty and Full Flags ............................... 14

Ordering Information ...................................................... 15

Ordering Code Definitions ......................................... 15

Package Diagrams .......................................................... 16

Acronyms ........................................................................ 19

Document Conventions ................................................. 19

Units of Measure ....................................................... 19

Document History Page ................................................. 20

Sales, Solutions, and Legal Information ...................... 21

Worldwide Sales and Design Support ....................... 21

Products .................................................................... 21

PSoC Solutions ......................................................... 21