SN74ACT7807-20PAG

FIFOs Memory Overview

The SN74ACT7807-20PAG is a 2048-word by 9-bit synchronous FIFO memory manufactured by Texas Instruments. It operates within a supply voltage range of 4.5 V to 5.5 V and supports data rates up to 50 MHz with a maximum access time of 13 ns. The device utilizes low-power advanced CMOS technology and features three-state outputs. It includes programmable almost-full/almost-empty flags, input-ready, output-ready, and half-full status indicators. The component is housed in a 64-pin Thin Quad Flat (PAG) package and is characterized for operation from 0°C to 70°C.

FIFOs Memory Feature Summary

• Supports asynchronous or coincident free-running read and write clocks synchronized to independent system clocks.
• Features programmable almost-full/almost-empty flag depth offsets alongside standard input-ready, output-ready, and half-full status flags.
• Enables easy expansion in both word width and word depth through cascading capabilities.
• Provides fast access times and high-speed data processing using low-power advanced CMOS technology.

FIFOs Memory Applications

• High-speed data buffering between asynchronous clock domains
• Data rate matching in communication systems
• Cascaded memory configurations for increased word depth or width

FIFOs Memory Procurement Notes

Verify the specific -20 speed grade designation matches the required 50 MHz operational frequency and 13 ns access time limits. Confirm the PAG package variant aligns with the intended 64-pin footprint requirements. Ensure the operating temperature range of 0°C to 70°C satisfies the environmental conditions of the target application design.

FIFOs Memory Selection Notes

Select this component when a 2048 x 9 bit capacity is required with synchronous control logic. Consider the -20 speed grade if system timing demands a maximum clock frequency of 50 MHz. Evaluate the availability of the 64-pin PAG package against board space constraints compared to alternative pinouts like PLCC or LQFP.

FIFOs Memory Part Context

This part belongs to the SN74ACT7807 family of clocked first-in, first-out memories. The family offers various speed grades (-15, -20, -25, -40) and package options including 44-pin PLCC and 64-pin QFP. The -20PAG suffix specifically denotes the 50 MHz performance level and the 64-pin plastic thin quad flat package configuration.

FIFOs Memory Replacement Considerations

Compatible substitutes include other SN74ACT7807 speed grades such as the -15, -25, or -40 variants, provided timing margins accommodate the differences. Alternative packages like the FN or PM versions offer identical electrical functionality but require different physical footprints on the printed circuit board.

FIFOs Memory FAQ

How are the almost-full and almost-empty flag offsets programmed?

Offsets are programmed after reset and before the first write by holding the Program Enable (PEN) low while providing binary values on the data inputs during a write clock transition.

What is the behavior of the output-ready flag during a reset cycle?

The output-ready flag goes low during reset and returns high on the third rising edge of the read clock after the first valid word is loaded into empty memory.