The MC74HC688N is an 8-bit Identity Comparator. This device compares two 8-bit words (P and Q) and provides an output indicating whether they are identical. It is designed for applications such as memory address decoding, peripheral selection, and data comparison tasks.

Applications

• Memory address decoding
• Peripheral selection
• Data comparison
• Microprocessor systems
• Control systems
• Data validation

Features

• High Speed Operation: tPD = 18 ns (typ) at VCC = 5V
• Low Power Dissipation: ICC = 4 μA (max) at TA = 25°C
• High Noise Immunity: VNIH = VNIL = 30 % VCC
• Operating Voltage Range: 2V to 6V
• 8-Bit Identity Comparison
• Equality Output (P=Q)
• Enable Input for Device Control

Benefits

• Fast comparison speed for efficient system operation.
• Low power consumption, suitable for battery-powered devices.
• Reliable operation in noisy environments.
• Simplified circuit design with an integrated comparator function.
• Versatile application in a variety of digital systems.
• Easy integration with microprocessor-based systems.

The MC74HC688N is an 8-bit identity comparator fabricated using silicon-gate CMOS technology. The device compares two 8-bit input words (P0-P7 and Q0-Q7). When the two words are identical, and the enable input (E) is low, the equality output (P=Q) goes high. If the enable input is high, the output remains low, regardless of the input values. The device operates from a supply voltage of 2V to 6V and is compatible with standard TTL logic levels. It is commonly available in a through-hole DIP package.