SN74ACT7807-15FN

FIFOs Memory Overview

The SN74ACT7807-15FN is a 2048-word by 9-bit synchronous FIFO memory manufactured by Texas Instruments. It utilizes low-power advanced CMOS technology and supports data rates up to 67 MHz with access times of 12 ns under a 50-pF load. The device operates within a supply voltage range of 4.5 V to 5.5 V 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 44-pin plastic leaded chip carrier package.

FIFOs Memory Feature Summary

• Supports asynchronous or coincident free-running read and write clocks for flexible system integration
• Features programmable almost-full/almost-empty flag thresholds for customized buffer management
• Provides cascading capabilities for expansion in both word width and word depth
• Includes dedicated input-ready, output-ready, and half-full status flags synchronized to respective clocks

FIFOs Memory Applications

• High-speed data buffering between asynchronous clock domains
• Parallel data processing systems requiring fast access times
• Memory interface circuits utilizing independent read and write clocks
• Systems requiring customizable buffer level monitoring via programmable flags

FIFOs Memory Procurement Notes

Verify the specific -15 speed grade designation matches the required 67 MHz operational frequency. Confirm the FN suffix corresponds to the 44-pin PLCC package variant. Ensure the design accommodates the specified 4.5 V to 5.5 V supply voltage range and 0°C to 70°C operating temperature limits. Check for current production status as legacy components may have availability constraints.

FIFOs Memory Selection Notes

Select this component when a 2048 x 9 bit capacity is required with synchronous operation. The -15 speed grade is suitable for applications demanding up to 67 MHz data rates. Consider the 44-pin PLCC package if surface mount assembly in that form factor is necessary. Evaluate the need for programmable AF/AE flags versus default offset values for buffer management strategies.

FIFOs Memory Part Context

This part belongs to the SN74ACT7807 family of clocked first-in, first-out memories. It is characterized for commercial temperature ranges and utilizes low-power advanced CMOS technology. The device is designed for bit-parallel data processing with noninverting data outputs relative to inputs.

FIFOs Memory Replacement Considerations

SN74ACT7807-20FN: Offers 50 MHz maximum clock frequency.

FIFOs Memory FAQ

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

Offsets are programmed after reset and before the first word is written. The Program Enable (PEN) pin must be held low while WRTCLK is high to latch the binary value on D0-D8 and WRTEN1/DP9 as the offset values.

What is the behavior of the Output-Ready (OR) flag during reset?

The OR flag is low during reset. It goes high on the third low-to-high transition of RDCLK after the first word is loaded into empty memory, indicating valid data is present on the output buffer.