SN74ALS873BDWR Integrated Circuits (ICs)

Series:	74ALS
Packaging:	Tape & Reel (TR)
Part Status:	Active
Logic Type:	D-Type Transparent Latch
Circuit:	4:4
Output Type:	Tri-State
Voltage - Supply:	4.5 V ~ 5.5 V
Independent Circuits:	2
Delay Time - Propagation:	8ns
Current - Output High, Low:	2.6mA, 24mA
Operating Temperature:	0°C ~ 70°C
Mounting Type:	Surface Mount
Package / Case:	24-SOIC (0.295", 7.50mm Width)
Supplier Device Package:	24-SOIC
Base Part Number:	74ALS873

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Introduction

The SN74ALS873BDWR is a logic latch circuit commonly used in integrated circuit logic families. It is a popular choice for applications such as digital control systems, memory decoders, counters and other digital devices. The SN74ALS873B includes two D-Type Flip Flop circuits that latch data when the latch enable pin is high, allowing for data transfer between two different circuits. This device provides 8-bit data input/output latches with common supply and latch enable pins. This device is available in both standard and wide-body packages, which is why it is well-suited for use in high-density applications.

Logic - Latches

A typical logic latch circuit is comprised of two gates: a data input gate and a latency enable gate. The data input gate takes the data to be stored and sends it to the latency enable gate. The latency enable gate then stores the data in the latch until the latch enable pin is triggered. The SN74ALS873B employs the same logic latch concept with two D-Type Flip Flops. Each Flip Flop is composed of a data input gate and a latch enable gate. When the latch enable pin is high, the data at the data input of the Flip Flop is stored in the latch until the latch enable pin is triggered. The SN74ALS873B also includes a common supply which simplifies device wiring. The SN74ALS873B can be used in a variety of applications. As mentioned previously, it is suitable for use in digital control systems, memory decoders, counters, and other digital devices. In addition, this device can also be used to provide address decoders, byte-wide memory multiplexers and synchronized parallel-to-serial conversion with data shift-in and shift-out operations.

Working Principle

The SN74ALS873B is a logic latch circuit with two D-Type Flip Flops. These Flip Flops are composed of data input and latch enable gates. When the latch enable pin is high, data at the data input of the Flip Flop is stored in the latch until the latch enable pin is triggered.The SN74ALS873B operates on simple logic. When the latch enable pin is low, the circuit is said to be “latched”. The data input to the circuit is stored and will be available at the output until the latch enable pin is triggered. When the latch enable pin goes high, the circuit is said to be “unlatched” and the data held in the latch is not available at the output. The data from the data input is then held and available until the latch enable pin goes low.

Conclusion

The SN74ALS873B is a widely used logic latch circuit employed in a variety of applications such as digital control systems, memory decoders, counters, and other digital devices. It includes two D-Type Flip Flops and an integrated common power supply pin which simplifies wiring. The SN74ALS873B operates on simple logic wherein data is latched (stored) when the latch enable pin is low and outputted when the latch enable pin goes high. The SN74ALS873B is a popular choice for applications that require data to remain stored until the trigger pin is enabled.

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