Equivalent & Substitute Parts for Renesas 7164S70DB

Part Overview

The Renesas 7164S70DB is a 64Kbit asynchronous SRAM memory IC in 28-CDIP packaging with 70 ns access time and parallel interface. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system support and new design implementations. The part operates across an extended temperature range of -55°C to 125°C with supply voltage tolerance of 4.5V to 5.5V.

Substiute Parts

7164S70DB

Renesas Electronics CorporationIn Stock: 11167164S70DB Datasheet

Current PartRFQ

7164L45DB

Renesas Electronics CorporationIn Stock: 8857164L45DB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 7164S70DB is based on maintaining electrical and mechanical compatibility across the following critical parameters:

• Memory capacity (64Kbit) and organization (8K x 8)
• Parallel interface architecture
• Supply voltage range (4.5V ~ 5.5V)
• Operating temperature range (-55°C ~ 125°C)
• Physical package (28-CDIP through-hole)
• Asynchronous SRAM technology

The 7164L45DB qualifies as a direct substitute because it maintains identical specifications in all critical parameters while offering improved access time performance (45 ns versus 70 ns). Access time improvement represents a performance enhancement rather than a compatibility constraint, as faster devices are functionally compatible with circuits designed for slower access times.

Parameter Comparison

Engineering Selection Recommendations

The 7164L45DB is the designated substitute for the obsolete 7164S70DB. Selection is based on:

• Identical memory capacity, organization, and interface specifications
• Matching electrical operating parameters (voltage and temperature ranges)
• Identical physical packaging and through-hole mounting compatibility
• Active product status ensuring continued availability and supply chain support
• Equivalent regulatory compliance (RoHS non-compliant, REACH Unaffected)

The faster access time of the 7164L45DB (45 ns) provides performance margin without introducing compatibility issues in circuits originally designed for 70 ns operation.

Frequently Asked Questions (FAQ)

Q: Can the 7164L45DB directly replace the 7164S70DB in existing designs?

A: Yes. The 7164L45DB maintains identical memory capacity, organization, interface type, voltage supply range, operating temperature range, and physical packaging. The improved access time does not create compatibility constraints.

Q: Are there any timing considerations when substituting the 7164L45DB?

A: No timing constraints exist. The 7164L45DB's faster access time (45 ns) is compatible with circuits designed for the original 70 ns specification. No circuit modifications are required.

Q: What is the difference between the 7164S and 7164L designations?

A: The letter designation indicates access time grade. The "S" in 7164S70DB denotes the 70 ns speed grade, while the "L" in 7164L45DB denotes the 45 ns speed grade. Both are asynchronous SRAM devices with identical memory organization and packaging.

Q: Are the packaging dimensions identical between these parts?

A: Yes. Both parts use 28-CDIP packaging with 0.600" (15.24mm) body width and are mounted through-hole. Pin-to-pin compatibility is maintained.

Q: What is the inventory status of the substitute part?

A: The 7164L45DB is in active production status with 827 pieces available in new original condition, ensuring supply chain continuity compared to the obsolete 7164S70DB.