SN74ALS577ANSR

Max Propagation Delay @ V, Max CL:	14ns @ 5V, 50pF
Base Part Number:	74ALS577
Package / Case:	24-SOIC (0.209", 5.30mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 70°C (TA)
Current - Quiescent (Iq):	18mA
Voltage - Supply:	4.5 V ~ 5.5 V
Current - Output High, Low:	2.6mA, 24mA
Trigger Type:	Positive Edge
Series:	74ALS
Clock Frequency:	30MHz
Number of Bits per Element:	8
Number of Elements:	1
Output Type:	Tri-State, Inverted
Type:	D-Type
Function:	Master Reset
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction

The SN74ALS577ANSR is a multi-function flip-flop integrated circuit (IC). It employs advanced Schottky TTL (SSTTL) performing well with low-power applications requiring good speed characteristics. This CMOS IC is an example of a four-bit static shift register which employs a static latch to store four bits of user data in temporary storage locations. SN74ALS577ANSR can be used to store data from a variety of digital sources.

Application field

SN74ALS577ANSR has a variety of applications in digital systems that require shift register operation. The primary field of application is for high-speed register applications where low propagation delay is required. The device can also be used to generate control signals for drive circuits, level converters, test equipment and other complex systems.Lapses in the design of direct memory access (DMA) and memory access controllers (MACs) can be prevented with the use of SN74ALS577ANSR integrated circuits. With the data storage capabilities of the device, vitalizing information can be retrieved any given time upon request. SN74ALS577ANSR can be used to prevent data losses due to power failure, by using an SRAM to store data until the next power-on event.Another application field of the SN74ALS577ANSR is in the implementation of priority encoders. Priority encoding is a technique to generates binarycoded numerical output from series of inputs. This process can convert the multiple input parameters from analog or digital sources into a single binary-coded numerical output. The SN74ALS577ANSR is a great choice for driving a 4-decimal encoder which requires three inputs to generate possible 4-bit encoded output.

Working Principle

The SN74ALS577ANSR shift register is a simple device composed of four individual latches, with each latch having two inputs and two outputs. The primary output of each latch is the “inverted” output (Q0, Q1, Q2, and Q3). The inverted outputs are connected to the input of the next latch, which ensures the data bit is shifted in the right direction. To complement the inverted output, each latch also produces a “normal” output (Q0#, Q1#, Q2#, and Q3#). This output is used to verify the output state of the shift register.The inputs of each latch consist of a data (D0, D1, D2, and D3) input and clock (Clk 0, Clk 1, Clk 2, and Clk 3) input. Data is sent to the shift register by allowing the valid data to be input to the first latch (D0) and then clock is applied to the first latch, prompting it to store the data at the “inverted” output (Q0) and “normal” output (Q0#).The data stored in the first latch is “shifted” to the second latch, by providing the clock signal to the second latch while keeping the data input to the second latch at a logic low (0V) level. As the data is shifted from left to right, the clock signal must be provided to each latch, thus storing the data from the data input of the latch.The fourth latch of the SN74ALS577ANSR has a separate data input (D4) and clock input (Clk4). As previously stated, valid data must enter the first latch (D0) to start the cycle. The fourth latch will store data from the data input (D4) when the clock input (Clk4) is set at a logic high (5V).

Conclusion

The SN74ALS577ANSR is a multi-function flip-flop IC that provides a wide range of applications in digital systems. It is used to store register data from digital sources, implementing priority encoders, and preventing data losses due to power failure. The device works in tandem with four latch parts which contain two inputs and two outputs. When the clock signal is applied, data passes through each of the four latch parts and is stored at their respective outputs. With its capabilities and applications, the SN74ALS577ANSR is a great choice for low-power applications.

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