Identity Comparator 8-Bit 20-Pin TSSOP T/R

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.

Cascadable

Fanout (Over Temperature Range)

• Standard Outputs. . . . . . . . . . . . . . . 10 LSTTL Loads
• Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads

Wide Operating Temperature Range . . . -55°C to 125°C

Balanced Propagation Delay and Transition Times

Significant Power Reduction Compared to LSTTL Logic ICs

HC Types

• 2V to 6V Operation
• High Noise Immunity: N_IL = 30%, N_IH = 30% of V_CC at V_CC = 5V

HCT Types

• 4.5V to 5.5V Operation
• Direct LSTTL Input Logic Compatibility, V_IL = 0.8V (Max), V_IH = 2V (Min)
• CMOS Input Compatibility, I_l = 1µA at V_OL, V_OH