1. General description
The 74HC688 is an 8-bit magnitude comparator. It performs comparisons of two 8-bit binary or
BCD words. Inputs include clamp diodes. This enables the use of current limiting resistors to
interface inputs to voltages in excess of VCC.
2. Features and benefits
• Compare two 8-bit words
• Wide supply voltage range from 2.0 to 6.0 V
• CMOS input levels
• CMOS low power dissipation
• High noise immunity
• Latch-up performance exceeds 100 mA per JESD 78 Class II Level B
• Complies with JEDEC standards
• JESD8C (2.7 V to 3.6 V)
• JESD7A (2.0 V to 6.0 V)
• ESD protection:
• HBM JESD22-A114-F exceeds 2000 V
• MM JESD22-A115-A exceeds 200 V
• Specified from -40 °C to +85 °C and from -40 °C to +125 °C