SN74V245-20PAG

Overview

The SN74V245-20PAG is a synchronous FIFO memory with a 4096 x 18-bit organization, packaged in a 64-pin TQFP. It supports clock frequencies up to 133 MHz and features read-access times as fast as 5 ns. The device operates on a 3.3-V supply with 5-V input tolerance and includes programmable almost-empty and almost-full flags.

Feature Summary

• Supports asynchronous or coincident read and write clocks for flexible interface control
• Features first-word fall-through or standard timing modes for optimized data throughput
• Includes programmable offset registers for customizable empty and full flag thresholds
• Provides half-full flag capability and expandability in depth and width

Applications

• DSP-to-processor communication interfaces
• DSP-to-analog front end buffering
• Network and video data communications

Procurement Notes

Verify the specific suffix 'PAG' corresponds to the 64-pin TQFP package and commercial temperature range (0°C to 70°C). Confirm that the '-20' designation aligns with the required performance specifications within the SN74V245 family documentation.

Selection Notes

Select this component when a high-speed, low-power CMOS FIFO is required for DSP applications. Ensure the design accommodates the 3.3-V power supply and utilizes the 5-V tolerant inputs if interfacing with legacy logic levels.

Part Context

This part belongs to the SN74V215/225/235/245 series of DSP-Sync FIFO memories. While sharing core architecture, the SN74V245 variant specifically provides a 4096 x 18 array depth, distinguishing it from smaller capacity models like the SN74V215 or SN74V235.

Replacement Considerations

SN74V245-15PAG

FAQ

How does the First-Word Fall-Through mode differ from Standard mode?

In FWFT mode, the first word written to an empty FIFO appears on the outputs after three RCLK transitions without requiring a Read Enable signal. In Standard mode, a specific read operation using REN is required to access any data.

What is the function of the LD pin?

The LD pin controls the loading of data into the internal offset registers. When LD is low, data on D0–D11 is written to these registers on the rising edge of WCLK or RCLK, allowing user programming of flag offsets.