This equality detector utilizes advanced silicon-gate CMOS technology to compare bit for bit two 8-bit words and indicate whether or not they are equal The PeQ output indicates equality when it is low A single active low enable is provided to facilitate cascading of several packages and enable compa
Features
Y TTL input compatible Y Typical propagation delay 20 ns Y Low quiescent current 80 mA maximum (74HCT Series) Y Large output current 4 mA Y Same as HCT521
Logic Diagrams
C1995 National Semiconductor Corporation TL F 5371
TL F 5371.
2 RRD-B30M105 Printed in U S A
Absolute Maximum Ratings (Notes 1 2)
If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications
Supply Voltage (VCC) DC Inpu.
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MM54HCT688 MM74HCT688 8-Bit Magnitude Comparator (Equality Detector)
February 1988
MM54HCT688 MM74HCT688 8-Bit Magnitude Comparator (Equality Detector)
General Description
This equality detector utilizes advanced silicon-gate CMOS technology to compare bit for bit two 8-bit words and indicate whether or not they are equal The PeQ output indicates equality when it is low A single active low enable is provided to facilitate cascading of several packages and enable comparison of words greater than 8 bits
This device is useful in memory block decoding applications where memory block enable signals must be generated from computer address information
The comparator combines the low power consumption of CMOS but inputs are compatible with TTL logic levels and the output can drive 10 low power
74688 Datasheet
