SN74ACT7804-20DLR Integrated Circuits (ICs)

Bus Directional:	Uni-Directional
Base Part Number:	74ACT7804
Supplier Device Package:	56-SSOP
Package / Case:	56-BSSOP (0.295", 7.50mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 70°C
FWFT Support:	No
Retransmit Capability:	No
Programmable Flags Support:	Yes
Expansion Type:	Width
Series:	74ACT
Current - Supply (Max):	400µA
Voltage - Supply:	4.5V ~ 5.5V
Access Time:	15ns
Data Rate:	50MHz
Function:	Asynchronous
Memory Size:	9K (512 x 18)
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction

The SN74ACT7804-20DLR is a low voltage 20-bit flow-through First-In-First-Out (FIFO) buffer. It is designed for use in synchronous digital systems. The SN74ACT7804-20DLR provides data flow between asynchronous clock domains. This FIFO buffer utilizes a low voltage TTL (LVTTL)/LVCMOS compatible system interface and is characterized to operate from 1.65V to 3.3V.

Application Field

The SN74ACT7804-20DLR buffer is suitable for applications with low noise, video and data streaming systems, in which data rates exceed the speed limit of logic and encoding capabilities. This FIFO buffer also has a variety of applications such as high-speed backplanes, point-to-point links, and standard interfaces.

Working Principle

The SN74ACT7804-20DLR buffer is designed to operate independently of the data stream, enabling it to accept data, store it in its internal FIFO, and then transfer it to the output port at the same rate as it was received. The SN74ACT7804-20DLR distinguishes between valid data and control signals to ensure proper data flow and reduce noise signals. The FIFO buffer performs a self-synchronization operation at the beginning of data transfer.The SN74ACT7804-20DLR buffer is a dynamic device, meaning that its parameters will vary depending on the power supply voltage, the input and output transition times, and the ambient temperature. The SN74ACT7804-20DLR is an 20-bit device, meaning that it can store 20 data bits at a time. The data is serially stored, with the first data bit being stored in the first available cell, followed by the second data bit in the second cell, and so on.When data is being transferred from the input of the FIFO buffer to its output, the SN74ACT7804-20DLR buffer will first check for the presence of valid data on its input. If valid data is present, it will then proceed to read the data bit by bit from the input, store it in its internal FIFO, and then transfer the data to the output port. This process is repeated until all of the data bits in the FIFO buffer have been read and transferred.At the same time, the SN74ACT7804-20DLR buffer also checks for control signals on its input to ensure proper data flow. It uses an internal "flow-sense" signal to guarantee that data is never stalled inside the FIFO buffer and that the output port is always in sync with the data stream. This flow-sense is generated each time a data bit is transferred between the input and the storage section.

Conclusion

The SN74ACT7804-20DLR is a low voltage 20-bit flow-through First-In-First-Out (FIFO) buffer designed for use in synchronous digital systems. It is suitable for applications with low noise, video and data streaming systems, in which data rates exceed the speed limit of logic and encoding capabilities. The SN74ACT7804-20DLR performs self-synchronization operations and uses an internal "flow-sense" signal to guarantee that data is never stalled and that the output port is always in sync with the data stream. This FIFO buffer provides data flow between asynchronous clock domains and is characterized to operate from 1.65V to 3.3V.

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