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Product Detailed Parameters
- Description：IC COMPARATOR IDENTITY 8B 20DIP
- Series：74HC
- Mfr：Texas Instruments
- Package：Tube
- Type：Identity Comparator
- Number of Bits：8
- Output：Active Low
- Output Function：A=B
- Voltage - Supply：2V ~ 6V
- Current - Output High, Low：5.2mA, 5.2mA
- Max Propagation Delay @ V, Max CL：36ns @ 6V, 50pF
- Current - Quiescent (Iq)：8 µA
- Operating Temperature：-40°C ~ 85°C
- Package / Case：20-DIP (0.300", 7.62mm)
- Supplier Device Package：20-PDIP
- Mounting Type：Through Hole
- Grade：-
- Qualification：-
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Overview
The SN74HC688N is an 8-bit identity comparator from Texas Instruments, designed to compare two 8-bit binary or BCD words. It operates within a supply voltage range of 2V to 6V and features a high-impedance tri-state output controlled by an output-enable input. The device utilizes CMOS HC technology for low power consumption and high noise immunity. It is housed in a 20-pin PDIP package and supports through-hole mounting. The comparator outputs a logic high only when the two input words are identical.
Feature Summary
- Performs parallel comparison of two 8-bit binary or BCD data words
- Includes an active-low output-enable input for tri-state control
- Provides a single output indicating equality between input pairs
Applications
- Digital system address matching
- Data validation circuits
- Control logic for equality checks
Procurement Notes
Verify the specific suffix 'N' confirms the 20-pin PDIP package and commercial temperature range. Ensure compatibility with 5V logic levels if used in mixed-voltage systems. Confirm RoHS compliance status for the specific manufacturing batch. Check for any recent lifecycle notices regarding production discontinuation or alternative recommendations from Texas Instruments.
Selection Notes
Select this component when an 8-bit equality check is required with tri-state output capability. Consider the HC series speed and power characteristics relative to other logic families. Ensure the operating voltage range matches the system design. Verify that the PDIP package fits the available PCB footprint and assembly constraints.
Part Context
This part belongs to the SNx4HC688 family of 8-bit identity comparators. It shares functional similarities with magnitude comparators but specifically identifies exact word matches. The HC technology offers improved performance over older TTL equivalents while maintaining pin compatibility with standard logic interfaces.
Replacement Considerations
Direct substitutes include the SN74HCT688N for TTL-compatible input levels. Other variants in the same family may offer different packaging options such as SOIC or TSSOP. Verify electrical specifications match before substitution.
