SN74ALS667DW

Series:	74ALS
Packaging:	Tube
Part Status:	Active
Logic Type:	D-Type Transparent Latch
Circuit:	8:8
Output Type:	Tri-State
Voltage - Supply:	4.5 V ~ 5.5 V
Independent Circuits:	1
Delay Time - Propagation:	9ns
Current - Output High, Low:	400µA, 8mA
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:	74ALS667

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Logic - Latches: SN74ALS667DW Application Field and Working Principle

SN74ALS667DW is an integrated circuit (IC) chip from Texas Instrument which belongs to the latch family of devices used in digital electronics. A latch is a switch that can store information and then lock it onto a given state until it is changed.This device has the ability to latch information and hold the level of that information until it is changed, even when power is removed. This makes it suitable for a variety of digital applications such as memory, data transfer and shift registers. It works in conjunction with a D type flip-flop to latch data and hold levels.The SN74ALS667DW is a dual 4-bit transparent latch. It can be used as two 4-bit latches or as one 8-bit register. As mentioned earlier, it works in conjunction with a D type flip-flop. The flip-flop on either side of the device holds the information and data is transferred on rising edges, or the leading edge, of the clock.The SN74ALS667DW has four control pins. These include pin 14 (nCE - active low chip enable), pin 13 (nOE - active low output enable), pin 4 (clock - rising edge triggered) and pin 3 (D – data pin). Data is transferred on the rising edge of the clock signal and the outputs are enabled (OE) when the chip enable (CE) is low.The SN74ALS667DW has two active low chip enable inputs (nCE), which simultaneously control whether the data is transferred from the D pins to the latches or from the latches to the outputs. It also has two active low output enables (nOE) that control whether the outputs are enabled or not. When the nCE is low, data will be latched and transferred from the D pins to the latch, and when it is high, data will be transferred from the latch to the outputs and the outputs will be enabled.The SN74ALS667DW is capable of handling both 3.3V or 5V logic level inputs. It also has provision for ensuring that the outputs are at the same logic levels as the inputs, at 3V or 5V, respectively. As with any latch device, the supply voltage can range from 5V to 15V, but it is recommended to use 5V for optimal operation.The SN74ALS667DW is typically used in applications such as memory storage, data transfer, shift register and address decoding. It can be used for tasks such as understanding multiple devices at the same time and allowing read and write access to the device.In conclusion, the SN74ALS667DW is a dual 4-bit transparent latch from Texas Instruments with the ability to latch information and hold the level of that information until it is changed. It works in tandem with a D type flip-flop and is used for a variety of tasks such as memory storage, data transfer, shift register and address decoding.

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