Description
●The ’HC688 and ’HCT688 are 8-bit magnitude comparators designed for use in computer and logic applications that require the comparison of two 8-bit binary words. When the compared words are equal the output (Y) is low and can be used as the enabling input for the next device in a cascaded application.
●Features
●• Cascadable
●• Fanout (Over Temperature Range)
● - Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads
● - Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
●• Wide Operating Temperature Range . . . -55oC to 125oC
●• Balanced Propagation Delay and Transition Times
●• Significant Power Reduction Compared to LSTTL Logic ICs
●• HC Types
● - 2V to 6V Operation
● - High Noise Immunity: NIL= 30%, NIH= 30%of VCCat VCC= 5V
●• HCT Types
●\- 4.5V to 5.5V Operation
●\- Direct LSTTL Input Logic Compatibility, VIL= 0.8V (Max), VIH= 2V (Min)
●\- CMOS Input Compatibility, Il ≤1µA at VOL, VOH
