CY7C4245V-25ASXC

FIFOs Memory Overview

The CY7C4245V-25ASXC is a low-voltage synchronous FIFO memory with a 4K x 18 organization and an 18-bit data bus. It operates at 3.3V with a maximum frequency of 40 MHz and a minimum cycle time of 25 ns. The device features independent read and write clocks, programmable Almost Full/Empty flags, and supports depth expansion via cascade pins. It is housed in a 64-pin 10x10 mm STQFP package.

FIFOs Memory Feature Summary

• Supports fully asynchronous and simultaneous read/write operations using independent clock domains.
• Includes programmable offset registers for customizable Almost Full and Almost Empty status flags.
• Enables depth expansion through dedicated Write and Read Expansion Input/Output pins.
• Provides a retransmit function to reset the internal read pointer for packet data handling.

FIFOs Memory Applications

• High-speed data acquisition buffering
• Multiprocessor interface synchronization
• Communications system buffering

FIFOs Memory Procurement Notes

Verify the specific suffix 'ASXC' against official Infineon documentation to confirm package type and temperature range. Ensure compatibility with 3.3V logic levels and check for lead-free compliance requirements. Confirm availability as this component series may have end-of-life status or be superseded by newer generations.

FIFOs Memory Selection Notes

Select this component when a 4K depth and 18-bit width are required for synchronous buffering. Consider the 25 ns speed grade for applications needing up to 40 MHz operation. Evaluate the need for programmable flags and depth expansion capabilities before choosing between other densities in the CY7C42X5V family.

FIFOs Memory Part Context

This part belongs to the CY7C42X5V family of low-voltage synchronous FIFOs manufactured by Cypress Semiconductor, now part of Infineon Technologies. The family offers various densities from 64x18 to 4Kx18, sharing common pinouts and functional architectures while differing in storage capacity and speed grades.

FIFOs Memory Replacement Considerations

Check for direct substitutes within the CY7C42X5V family with different speed grades (e.g., -15 or -35) if timing constraints allow. Verify if newer Infineon FIFO products offer compatible pinouts and functionality.

FIFOs Memory FAQ

How are the Almost Full and Almost Empty flags synchronized?

The flags become synchronous to the Write Clock (WCLK) or Read Clock (RCLK) respectively when the VCC/SMODE pin is tied to VSS. If tied to VCC, they operate asynchronously.

What is the purpose of the FL/RT pin?

In standalone mode, it serves as the Retransmit input to reset the read pointer. In depth expansion configurations, it designates the first device in the daisy chain when tied to VSS.