Description

The CY7C421-25JC is a first-in first-out (FIFO) memory in a 600-mil wide IC package. It has a capacity of 512 words by 9-bits wide, which means it can store up to 512 sets of data with each set containing 9 bits of information. The data is read in the same sequential order that it was written. It has Full and Empty flags to avoid overrun and underrun. Additionally, it has three pins that allow for unlimited expansion in width, depth, or both. The depth expansion technique steers control signals and data between devices in parallel to avoid propagation delays and maintain throughput.

Specifications and features

• Asynchronous first-in first-out (FIFO) buffer memory
• 256 x 9 (CY7C419), 512 x 9 (CY7C421), 1K x 9 (CY7C425), 2K x 9 (CY7C429), 4K x 9 (CY7C433) storage capacity options
• Dual-ported RAM cell
• High-speed 50.0-MHz read/write independent of depth/width
• Low operating power with an ICC of 35 mA
• Full and Empty flags (Half Full flag in standalone)
• TTL compatible
• Retransmit in standalone
• Expandable in width
• PLCC, 7x7 TQFP, SOJ, 300-mil and 600-mil DIP packaging options
• Pin compatible and functionally equivalent to IDT7200, IDT7201, IDT7202, IDT7203, IDT7204, AM7200, AM7201, AM7202, AM7203, and AM7204

Application Scenarios

The CY7C421-25JC can be used in various circuits that require data buffering such as digital signal processing, audio, video, or communication systems. It is often used for data communication between two devices operating at different speeds, or between two systems with different clock rates or capacities.

Comparison

• Offers various storage capacities options for flexibility in application
• High-speed read/write independent of depth/width increases throughput
• Low operating power helps reduce energy consumption and heating
• Full and Empty flags prevent overrun and underrun, ensuring data accuracy and preventing data loss
• Expandable in width allows for unlimited expansion options

• Asynchronous operation may cause timing and synchronization issues in some applications
• Full and Empty flags require additional circuitry for proper usage
• May not be cost-effective for small-scale applications due to its high storage capacity and advanced features