SN74HC688DWE4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments SN74HC688DWE4 is an 8-bit identity comparator in the HC logic family housed in a 20-pin SOIC package. Provides cascadable magnitude comparison with inverted output for address decoding and data matching. Available from authorized distributors with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- SN74HC688DWE4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 8-bit parallel identity comparator enabling simultaneous comparison of two 8-bit words in a single clock cycle
- Cascadable design allowing multiple devices to be chained for wider-than-8-bit word comparison without additional logic
- HC/UH logic family operating from 2V to 6V supply for versatile 3.3V and 5V system compatibility
- 20-pin SOIC package with RoHS-compliant lead-free construction (JESD-609 e4) for standard PCB assembly
Applications
The SN74HC688DWE4 is used in address decoding circuits for memory and peripheral selection in microprocessor-based systems, where fast 8-bit address comparison is needed. Its cascadable feature makes it ideal for building wider comparators in bus arbitration, data validation, and pattern matching circuits. The HC logic family compatibility allows it to interface with both 3.3V and 5V digital systems in industrial control, embedded computing, and programmable logic applications.
Specifications
| YTEOL | 0 |
| Additional Feature | CASCADABLE |
| Family | HC/UH |
| JESD-30 Code | R-PDSO-G20 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | IDENTITY COMPARATOR |
| Number of Bits | 8 |
| Number of Functions | 1 |
| Output Polarity | INVERTED |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP20,.4 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TUBE |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 50mA |
| Propagation Delay (tpd) | 265ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 6V |
| Supply Voltage-Min (Vsup) | 2V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for SN74HC688DWE4:
Frequently Asked Questions
What does the SN74HC688DWE4 do?
The SN74HC688DWE4 is an 8-bit identity comparator that compares two 8-bit binary words (P and Q inputs) and asserts a low output when P equals Q. It is used in applications requiring fast hardware-based byte comparison, such as address decoding in memory systems, chip select generation, and equality checking in data path logic.
Can the SN74HC688DWE4 be cascaded for wider comparisons?
Yes, the SN74HC688DWE4 supports cascading through its enable input, allowing multiple devices to be connected in series to compare word widths greater than 8 bits. For example, two cascaded SN74HC688 devices can perform 16-bit identity comparison without additional glue logic, making it efficient for wider address or data matching.
What logic family does the SN74HC688DWE4 belong to?
The SN74HC688DWE4 belongs to the HC (High-speed CMOS) logic family, which operates from 2V to 6V supply voltage. HC logic offers low power consumption and high noise immunity compared to TTL, and is compatible with both 3.3V and 5V CMOS and TTL logic levels, making it versatile for mixed-voltage board designs.
What package does the SN74HC688DWE4 use?
The SN74HC688DWE4 comes in a 20-pin Small Outline Integrated Circuit (SOIC) package, identified by JESD-30 code R-PDSO-G20. The wider body SOIC-20 accommodates the additional I/O pins required for an 8-bit dual-port comparator and supports standard automated pick-and-place assembly in production environments.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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