SN74ACT3622-20PQ

Bus Directional:	Bi-Directional
Base Part Number:	74ACT3622
Supplier Device Package:	132-BQFP (24.54x24.54)
Package / Case:	132-BQFP Bumpered
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:	13ns
Data Rate:	50MHz
Function:	Synchronous
Memory Size:	18K (256 x 36 x 2)
Part Status:	Obsolete
Packaging:	Tray

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Introduction to SN74ACT3622-20PQ

The SN74ACT3622-20PQ is a second-level non-inverting logic integrated circuit or “chip” manufactured by Texas Instruments (TI). Upon superficial inspection, the SN74ACT3622-20PQ appears remarkably unremarkable; it is a packaged 24-pin DIP (Dual In-line Package) featuring mostly discrete through-hole leads for easy soldering and attachment. Though not the most impressive IC out there, the SN74ACT3622-20PQ is a very useful product that comes with a lot of features built inside its small form factor.

Application Field

The SN74ACT3622-20PQ is a versatile First-In-First-Out (FIFO) memory memory device, useful in a variety of applications where data flow and consistency needs to be guaranteed. This IC is an essential component of digital systems where data needs to be stored for later retrieval, whether it be text, images, audio, or any other kind of data stream. The SN74ACT3622-20PQ is used mostly in low-speed interface or digital communication applications, however can also perform functional calculation within digital devices. In addition, the SN74ACT3622-20PQ can be used in theoretical data and operations where functions cannot be automated, but must instead be processed by a computer.

Working Principle

The way the SN74ACT3622-20PQ works is simple, but ingenious: it sets up an internal high-speed RAM (Random Access Memory) and uses it as an interface. This internal RAM is a static, dual-port FIFO (First-In-First-Out) memory and is the main component of the IC. Data is transferred between two nodes through the RAM. The two nodes are the input pin and the output pin. A logic input on the input pin will be stored in the internal RAM and will be read at the output pin when a control line is triggered. This allows for data to be buffered, meaning data can be slowly processed on the destination end than the data rate at the source end of the circuit. The IC can detect input overflows and inform the driver with an overflow flag, by external hardware or software response to the overflow flag can then prevent further input. The IC can also detect output underflows and inform the driver with an underflow flag. This flag can also prevent further input when responding to an underflow condition.

Conclusion

The SN74ACT3622-20PQ chip is an invaluable tool for interfacing and buffering data flows in digital systems. With its built-in static FIFO memory coupled with its overflow and underflow flags, it can detect and caution data input rates while ensuring that data is transmitted to the last bit with integrity. All of this comes packed within its small 24-pin DIP package, making it an ideal component for applications where space is a premium commodity.

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