MM74HC688WM

Series:	74HC
Packaging:	Tube
Part Status:	Obsolete
Type:	Identity Comparator
Number of Bits:	8
Output:	Active Low
Output Function:	A=B
Voltage - Supply:	2 V ~ 6 V
Current - Output High, Low:	5.2mA, 5.2mA
Max Propagation Delay @ V, Max CL:	30ns @ 6V, 50pF
Current - Quiescent (Iq):	8µA
Operating Temperature:	-40°C ~ 85°C
Package / Case:	20-SOIC (0.295", 7.50mm Width)
Mounting Type:	Surface Mount
Base Part Number:	74HC688

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MM74HC688WM Application Field and Working Principle

Introduction

The MM74HC688WM is a high speed CMOS 8-Bit Comparator and Slicer manufactured by Motorola. This versatile device combines a programmable threshold slicer, latch and counter, allowing users to design complete logic functions with configurable hysteresis. It responds to both logic high and logic low inputs, allowing it to be used as both a binary and a quaternary comparator. This product is fully pin and software compatible with the MC74HC688BB1, MC74HC688B1 and MC74HC688WM but with a reduced power consumption of just 40µW.

Application Field

The MM74HC688WM is a versatile device which is suitable for a range of applications including extending addressable systems, wireless controllers, test and measurement systems, instrumentation, and design automation. This device can be used to compare any two 8-bit binary numbers, giving a true output if the two numbers are equal, and a false output if the two numbers are unequal. This device can also be used as an 8-bit pseudorandom generator, a network diagnostics monitor, or a pattern recognition device.

Working Principle

The MM74HC688WM utilizes a binary comparator and a threshold slicer as its primary components. The binary comparator, located on the left side of the chip, has two 8-bit inputs and one true/false output. When both inputs are the same, the output will be true. When both inputs are different, the output will be false. The threshold slicer, located on the right side of the chip, uses hysteresis to recognize high and low levels on the input signal. The input threshold is programmable between 4.85V and 9.7V, allowing users to tailor the device\'s response to their specific needs.The chip also features two tri-state output buffers, each capable of sinking up to 10 mA from VCC. These buffers are used to interface the device to a variety of logic and bus structures. The M74HC688WM also houses a two-bit counter, which is used for sequence recognition, address recognition, and network diagnostics.

Conclusion

The MM74HC688WM is a versatile, low-power CMOS 8-Bit Comparator and Slicer that is designed for applications that require logic comparison or slicing with programmable hysteresis. It is ideal for logic comparison, data comparison, and signal diagnosis applications. This device is used in a variety of applications such as extending addressable systems, wireless controllers, test and measurement systems, instrumentation, and design automation.

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