7203L25J

Bus Directional:	Uni-Directional
Base Part Number:	7203
Supplier Device Package:	32-PLCC (14x11.46)
Package / Case:	32-LCC (J-Lead)
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 70°C
FWFT Support:	No
Retransmit Capability:	Yes
Programmable Flags Support:	No
Expansion Type:	Depth, Width
Series:	7200
Current - Supply (Max):	120mA
Voltage - Supply:	4.5V ~ 5.5V
Access Time:	25ns
Data Rate:	28.5MHz
Function:	Asynchronous
Memory Size:	18K (2K x 9)
Part Status:	Obsolete
Packaging:	Tube

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Introduction

The 7203L25J is a FIFO (First In, First Out) memory adapted from the SDRAM standard and is one of the most popular applications of logic-FIFOs. The SLxx25J is a compact yet robust memory that is used to facilitate the read-in/out of dynamic data, making it a viable option for embedded systems. The 7203L25J is also a specific variant of many SLxx25J types and utilizes 512-bit or 1024-bit memory to store data.

Application Field

The 7203L25J FIFO is most commonly used to provide an interface between two clocking domains in mixed high-speed and low-speed designs. In such applications, a FIFO saves data reliably and quickly across the speed- and voltage-dissimilar timing regions. The 7203L25J FIFO can also be used in parallel data-transmission designs that require data to be sent and received at different rate in subsequent clocks. This means data must be output after a set number of clock cycles, which is where the 7203L25J FIFO comes in handy as it can store this data until it is needed. The 7203L25J FIFO can also be used for TCP/IP off-load processing and bridging, PCMCIA controllers, communications processors, HDLC controllers, arbiter controllers, and many other applications. Another popular application for the 7203L25J FIFO is as a data buffer in system-level designs such as network switches, embedded systems, servers and workstations.

Working Principle

When the 7203L25J is deployed as a FIFO, it generally works within the following parameters:* Data is entered serially. * Data is output serially. * Data is stored in the FIFO in batches of two or four bytes. For read operations, the 7203L25J receives the input data via its input buffers and then stores the data in memory. When the memory reaches a pre-defined level, an interrupt is sent to the processor to indicate that the input buffer is full. When the processor responds to the interrupt and reads the data from memory, the memory should be empty enough for more data to be received. For write operations, the 7203L25J receives the required data from the processor. It then stores the data in its output buffer. When the output buffer is full, an interrupt is sent to the processor to indicate that the data is ready to be transmitted. The processor will respond to the interrupt and transmit the data over the appropriate medium. The 7203L25J also has a backup system that allows it to continue to function properly even when a power failure occurs. The backup system is supported on a hardware basis, and utilizes SRAMs and logic circuits to maintain the control of the FIFO.

Conclusion

The 7203L25J FIFO is an extremely powerful and versatile memory-based logic-FIFO application that facilitates high-speed data transmission and storage in applications ranging from network switches to bridging and communication processors. The 7203L25J is a specific variant of the SLxx25J type, and utilizes 512-bit or 1024-bit memory to store data. It is most commonly used in domains with mixed high-speed and low-speed designs, as well as for parallel data-transmission designs. The 7203L25J also contains a backup system and provides an interrupt when input/output buffers reach a pre-defined level.

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