SN74ALS259DR Integrated Circuits (ICs)

Series:	74ALS
Packaging:	Tape & Reel (TR)
Part Status:	Active
Logic Type:	D-Type, Addressable
Circuit:	1:8
Output Type:	Standard
Voltage - Supply:	4.5 V ~ 5.5 V
Independent Circuits:	1
Delay Time - Propagation:	2ns
Current - Output High, Low:	400µA, 8mA
Operating Temperature:	0°C ~ 70°C
Mounting Type:	Surface Mount
Package / Case:	16-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	16-SOIC
Base Part Number:	74ALS259

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Introduction of Logic - Latches

Logic - Latches are digital circuits that temporarily store a value until a control input changes it or until power is lost. This type of component is known as memory circuits. Latches are also known as bistable multivibrators. Logic latches are used in a variety of flip-flop, multiplexer and register applications.

SN74ALS259DR application field and working principle

SN74ALS259DR is a peak detector latch manufactured by Texas instruments. It belongs to a category of logic latches. This component has a wide range of applications, such as memory and display applications.SN74ALS259DR is an 8 bit memory data latch. It is organized with 8 independent data inputs, control inputs and inverted outputs. The latch responds to any positive or negative going edges of data inputs, even if the data inputs are not stable to ground.The device consists of eight primary datasheet circuits, each consisting of a data input, a data output and a clock enable (CE) input used to enable or disable the data flow. When the CE input is high, the device is enabled and data is transferred from the input to the output when the clock input (CK) is pulsed. When the enable input is low, the data transfer is stopped and the device is disabled. The device provides dual capability and enables data to be transferred from the data inputs to the outputs without the need for external logic.The data transfer from the data inputs to the outputs is done in two different stages. In the first stage, the data is transferred from the data inputs to the outputs when the clock is pulsed. In the second stage, the data is retained in the latch by the two clock inputs. The first stage is activated when the CE input is low and the CK input is pulsed. The second stage is enabled when the CE input is high and the CK input is pulsed.The output of the SN74ALS259DR is held in a state until the rising edge of the next clock pulse releases it. The latch is also transparent when the CE input is held low regardless of the state of the CK input. The device incorporates Schmitt trigger inputs, which provide an hysteresis of 1V or less.

Conclusion

In conclusion, SN74ALS259DR is a peak detector latch manufactured by Texas instruments. It belongs to a category of logic latches. This component has a wide range of applications, such as memory and display applications. It consists of eight primary datasheet circuits, each consisting of a data input, a data output and a clock enable (CE) input used to enable or disable the data flow. The latch responds to any positive or negative going edges of data inputs, even if the data inputs are not stable to ground. The device provides dual capability and enables data to be transferred from the data inputs to the outputs without the need for external logic. The SN74ALS259DR is also transparent when the CE input is held low regardless of the state of the CK input.

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