72851L25TF8

Bus Directional:	Bi-Directional
Base Part Number:	72851
Supplier Device Package:	64-TQFP (10x10)
Package / Case:	64-LQFP
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 70°C
FWFT Support:	No
Retransmit Capability:	No
Programmable Flags Support:	Yes
Expansion Type:	Depth, Width
Series:	7200
Current - Supply (Max):	80mA
Voltage - Supply:	4.5V ~ 5.5V
Access Time:	15ns
Data Rate:	40MHz
Function:	Synchronous
Memory Size:	144K (8K x 9 x 2)
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction

The 72851L25TF8 Logic-FIFOs Memory is an advanced memory designed to store data in an orderly fashion and facilitate faster data transfer. This article provides an overview of the 72851L25TF8 application field, its architecture and its working principle.

Application Field

The 72851L25TF8 Logic-FIFOs Memory is typically used for data buffers, communication interface gates and high speed serial I/O applications. It can be used in systems such as digital computers, radio communication systems, digital communication controllers, system bus controllers and digital keyboard systems.

Architecture

The 72851L25TF8 is made of two distinct components: a logic (L) and a FIFOs (25TF8). The L part is a Logic-FIFOs memory consisting of a 256-byte RAM core and an internal interface that links to a bus system. The RAM core is configured as a circular FIFO with eight 16-byte banks. The data interface functions enables read and write operations with the RAM core, so data can be written in one direction and retrieved in the other direction. In addition, the logic supports automatic data transfer and provides error correction and detection functions. This logic also provides interrupt and status indications, flow control capabilities and data time-out functions. The 25TF8 part is a dedicated block of memory used to store data of various lengths. It uses a single write port with eight byte-wide FIFO banks and an external interface port.

Working Principle

The 72851L25TF8 works on the principle of first-in, first-out (FIFO). Data can be written to the FIFO on one side and retrieved on the other side. Data is usually written by a master controller and read by a slave controller. The data is first written to the logic, which completes any necessary operations and validates the data with an error detection mechanism. If the data is correct, the logic then sends the data to the FIFOs. In the FIFOs, the data is stored in an orderly manner and the data can be retrieved from the FIFOs. The data is retrieved from the FIFOs in chunks and then sent back to the logic for additional error checking if necessary. After the additional error checking, the logic sends the retrieved data to the master controller. The logic can also provide indications such as interrupts and status signals that the master controller can use for monitoring.

Conclusion

The 72851L25TF8 Logic-FIFOs Memory is a highly advanced memory device that is suited for high speed serial I/O applications. It works on the principle of first-in, first-out (FIFO) data transfer and supports automatic data transfer with error detection and correction capabilities. The Logic-FIFOs Memory has a simple architecture consisting of a logic and FIFOs which enable data to be written and retrieved without latency. It is an ideal solution for applications that require fast data transfer with high data accuracy.

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