SN74ACT2235-40PAG

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Logic - FIFOs Memory

SN74ACT2235-40PAG is a first-in, first-out (FIFO) memory integrated circuit manufactured by Texas Instruments. It is an 8-bit FIFO memory with a capacity of 64 x 8-bit registers. This FIFO is part of the Texas Instruments family of Advanced CMOS logic devices and is designed to interface to the industry standard CMOS logic. It has an 8-bit input and output and flow control with output enable and full/empty flags. Its power supply voltage is from 2.7 volts to 5.5 volts.

The SN74ACT2235-40PAG FIFO is mainly used for data buffering and bridging between two devices operating at different data rates. It is often used to reduce the number of interrupts that the system may need to handle. FIFOs can be used for data transactions between computing devices at different speeds and in applications where data loss due to buffer underruns or overruns is unacceptable.

This FIFO allows multiple data transfers to occur at the same time while ensuring data is always transferred in the correct order. It has an open drain output enable, allowing it to be configured as 1-of-8 multiplexer, reducing the pin count by one. The chip features parity detect/generate and has various write clock modes including a stop/start mode, a pulsed mode, and a single shot mode.

Working Principle

The SN74ACT2235-40PAG FIFO Memory consists of a 64 x 8-bit FIFO memory, an 8-bit Input Register, an 8-bit Output Register, two Write Clock Generator blocks, two Read Clock Generator blocks, two Write Enable Flip-Flop circuits, two Read Enable Flip-Flop circuits, two Full/Empty flags and two output enables. The memory can be operated as either an 8-bit FIFO or as a 64-bit RAM.

In FIFO mode, data is written and read in the same order. When data is written to the device, the write enable flip-flop detects the write enable state and contributes to the control signal of the write clock generator. When the write enable signal goes high, the write clock signal toggles. When data is read, the read enable signal must go high in order for the data to be shifted out. This signal is detected by the read enable flip-flop and is then passed to the read clock generator.

When data is being written or read, the corresponding full/empty flags will indicate the memory status. When writing, the full flag indicates that the buffer is full and can no longer accept data. When reading, the empty flag indicates that the buffer is empty and can no longer provide data. The data must be read before more data is written, otherwise data will be lost. The output enable is used to control the data output of the FIFO memory and can be used as a 1-of-8 multiplexer.

Conclusion

The SN74ACT2235-40PAG is a flexible, 8-bit FIFO memory which allows data to be written and read in the same order. It can be used in a variety of different applications as a data buffering and bridging device. Furthermore, it is a low-power, DC-coupled device which can operate from a single 2.7V to 5.5V supply voltage.

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