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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Renesas 7164L20DB

Name: 7164L20DB
Brand: Renesas
SKU: 7164L20DB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 7164L20DB

Manufacturer:: Renesas

Category:: Memory

Package:: 28-CDIP (0.600", 15.24mm)

Datasheet:: 7164L20DB.pdf

Description:: IC SRAM 64KBIT PARALLEL 28CDIP

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Inventory:2,715

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Product details

Overview

7164L20DB from Renesas Electronics is a 64K (8K × 8-bit) low-power CMOS static RAM with 20 ns maximum address access time, TTL-compatible I/O, three-state outputs, and battery backup data retention down to 2 V. It operates from a single 5 V supply and supports military temperature range (–55°C to +125°C) in a 28-pin CERDIP package - used in avionics control modules requiring nonvolatile SRAM holdover during power interruption.

For engineers reviewing the 7164L20DB datasheet, 7164L20DB pinout, 7164L20DB application, or 7164L20DB equivalent, this page delivers verified timing parameters, military-grade DC/AC specs, standby current behavior, data retention characteristics, and precise pin-function mapping per Renesas' official documentation (Rev. Jul.30.20).

Technical Context

The 7164L20DB implements fully static asynchronous operation with dual chip select (CS1/CS2) logic enabling automatic low-power standby when CS1 is HIGH or CS2 is LOW. Its architecture uses high-reliability CMOS process technology and supports independent read/write cycles without clocks or refresh.

It features two distinct power modes: active operation with typical ICC of 110 mA (max 170 mA), and standby mode with ISB as low as 5 µA (military grade). The L-version provides guaranteed data retention at VCC ≥ 2.0 V across full military temperature range, validated per MIL-STD-883 Class B.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Organization	8K × 8-bit (65,536 bits), byte-wide parallel interface for direct microprocessor bus connection
Access Time (tAA)	20 ns max (military grade), defines minimum time between address valid and valid data output
Supply Voltage	5.0 V ± 10% (4.5–5.5 V), single-rail operation simplifies power design vs. dual-supply SRAMs
Data Retention Voltage	2.0 V min (L version only), enables battery-backed memory holdover during main power loss
Standby Current (ISB)	5 µA max (military temp), ensures ultra-low quiescent draw in powered-down state
Operating Temperature	–55°C to +125°C, qualified to MIL-STD-883 Class B for mission-critical defense/aerospace systems
I/O Compatibility	TTL input thresholds (VIH = 2.2 V min, VIL = 0.8 V max) and output drive (VOL = 0.4 V @ 8 mA)

Pinout & Package

7164L20DB is housed in a 28-pin Ceramic Dual In-line Package (CDIP), 600 mil width, hermetically sealed for high-reliability military applications. Pin 1 is marked with a dot; pin count and spacing comply with JEDEC MS-011.

Pin/Terminal	Circuit Role	Design Meaning
A0–A12	Address Inputs	13-bit address bus accepting 0–8191 for 8K-word selection; fully static, no setup/hold required
I/O0–I/O7	Bidirectional Data Bus	8-bit tri-state data path; high-impedance when CS inactive or OE/WE conditions unsatisfied
CS1, CS2	Chip Select Inputs	Active-LOW CS1 and active-HIGH CS2 enable device; CS2 powers down CS1 but not vice versa
WE	Write Enable	Active-LOW control for write cycle initiation; synchronous with CS and address stability
OE	Output Enable	Active-LOW control for output buffer activation; independent of WE for read-modify-write flexibility
VCC, GND	Power Supply	Single 5 V rail (4.5–5.5 V); ground reference for all logic and I/O; decoupling mandatory per layout guidelines

Key Features

Feature	Design Value
20 ns military-grade access time	Enables integration into 50 MHz CPU buses without wait states in hardened embedded controllers
Battery backup data retention at 2 V	Supports >10-year data hold with coin-cell backup in field-deployed telemetry units
Dual chip select with hierarchical power-down	Reduces system-level standby current by enabling selective SRAM bank disable in multi-memory systems
MIL-STD-883 Class B compliance	Validated for shock, vibration, temperature cycling, and burn-in - required for flight-critical hardware
TTL-compatible I/O on 5 V supply	Eliminates level-shifting components when interfacing with legacy 5 V microcontrollers and FPGAs

Applications

Avionics Flight Control Memory	Tactical Radio Configuration Storage
Use Scenario: Stores real-time flight parameter lookup tables and control algorithm coefficients in airborne guidance computers. IC Role / Device Role / Timing Role: Nonvolatile SRAM buffer holding critical firmware data during engine start-up transient voltage sags. Use Value: 2 V data retention ensures uninterrupted memory integrity during 500 ms brownout events common in aircraft electrical systems.	Use Scenario: Holds encrypted channel maps and encryption keys in manpack radios operating in extreme desert environments. IC Role / Device Role / Timing Role: High-reliability memory node retaining secure configuration across –55°C to +125°C thermal cycling. Use Value: MIL-STD-883 qualification guarantees zero bit errors after 1,000-hour temperature/humidity stress testing.
Missile Seeker Signal Processing Buffer	Naval Radar System Calibration Table Storage
Use Scenario: Buffers intermediate FFT results in infrared seeker DSP pipelines where deterministic latency is mandatory. IC Role / Device Role / Timing Role: 20 ns tAA enables single-cycle memory access for 40 MHz processing clocks in analog-to-digital front ends. Use Value: Sub-25 ns read cycle time eliminates pipeline stalls in real-time target tracking loops.	Use Scenario: Stores factory-calibrated antenna gain/phase compensation coefficients updated only during depot maintenance. IC Role / Device Role / Timing Role: Long-term archival memory with write-protection enforced via hardware CS gating during normal operation. Use Value: Hermetic CDIP packaging prevents moisture-induced parametric drift over 20-year service life in maritime salt fog environments.

Avionics Flight Control Memory

Tactical Radio Configuration Storage

Use Scenario: Stores real-time flight parameter lookup tables and control algorithm coefficients in airborne guidance computers.

IC Role / Device Role / Timing Role: Nonvolatile SRAM buffer holding critical firmware data during engine start-up transient voltage sags.

Use Value: 2 V data retention ensures uninterrupted memory integrity during 500 ms brownout events common in aircraft electrical systems.

Use Scenario: Holds encrypted channel maps and encryption keys in manpack radios operating in extreme desert environments.

IC Role / Device Role / Timing Role: High-reliability memory node retaining secure configuration across –55°C to +125°C thermal cycling.

Use Value: MIL-STD-883 qualification guarantees zero bit errors after 1,000-hour temperature/humidity stress testing.

Missile Seeker Signal Processing Buffer

Naval Radar System Calibration Table Storage

Use Scenario: Buffers intermediate FFT results in infrared seeker DSP pipelines where deterministic latency is mandatory.

IC Role / Device Role / Timing Role: 20 ns tAA enables single-cycle memory access for 40 MHz processing clocks in analog-to-digital front ends.

Use Value: Sub-25 ns read cycle time eliminates pipeline stalls in real-time target tracking loops.

Use Scenario: Stores factory-calibrated antenna gain/phase compensation coefficients updated only during depot maintenance.

IC Role / Device Role / Timing Role: Long-term archival memory with write-protection enforced via hardware CS gating during normal operation.

Use Value: Hermetic CDIP packaging prevents moisture-induced parametric drift over 20-year service life in maritime salt fog environments.

Equivalent & Alternatives

The following parts are listed as comparable options for similar static RAM applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
CY62167EV30LL-20ZSXI	512K × 16-bit, 3.3 V core, 20 ns access, TSOP-II package	Higher density and lower voltage; lacks military temp rating and 2 V data retention	Select when migrating to modern 3.3 V systems with space-constrained PCBs and no legacy 5 V bus
AS6C1008-20TIN	128K × 8-bit, 5 V, 20 ns, industrial temp only (–40°C to +85°C), SOIC package	No MIL-STD-883 qualification; higher standby current (200 µA); no battery backup capability	Choose for cost-sensitive commercial/industrial designs where military reliability and data retention are unnecessary

Compared with CY62167EV30LL-20ZSXI and AS6C1008-20TIN, the 7164L20DB uniquely combines military temperature operation, 2 V data retention, and MIL-STD-883 Class B certification - making it irreplaceable in safety-critical defense platforms where environmental robustness and power-fail resilience are non-negotiable.

Availability

7164L20DB is available at Aetrix Electronics and suitable for avionics control, tactical radio, missile seeker, and naval radar applications requiring stable component supply across extended product lifecycles and stringent obsolescence management.

Supply support for 7164L20DB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Renesas Electronics Corporation is a global semiconductor leader specializing in microcontrollers, analog, power, and memory solutions for automotive, industrial, and infrastructure markets.

The 7164L20DB belongs to Renesas' legacy high-reliability SRAM product line, engineered specifically for defense, aerospace, and industrial systems demanding guaranteed operation under extreme thermal, mechanical, and electrical stress.

FAQ

What is the maximum operating temperature range for the 7164L20DB?

The 7164L20DB is rated for –55°C to +125°C operation and is fully qualified to MIL-STD-883 Class B. This specification is explicitly confirmed in the "Recommended Operating Temperature and Supply Voltage" table (2967 tbl 03) and reinforced in the Ordering Information section, where "M" grade denotes military temperature compliance. Renesas validates this range through temperature cycling, burn-in, and parametric testing per MIL standards.

Does the 7164L20DB support true data retention at 2 V across its full temperature range?

Yes - the 7164L20DB guarantees data retention at VCC ≥ 2.0 V across –55°C to +125°C, as documented in the "Data Retention Characteristics" table (2967 tbl 10). This is exclusive to the "L" (low-power) variant and is enabled by optimized CMOS threshold design; the "S" variant does not offer this feature.

What package type is used for the 7164L20DB?

The 7164L20DB uses a 28-pin Ceramic Dual In-line Package (CDIP), identified by code "CD28" in Renesas' ordering information (2967 drw 02, p.10). It is a 600 mil wide, hermetically sealed ceramic package with lead finish compliant with MIL-STD-750 Test Method 2005.

How does chip select logic work on the 7164L20DB?

The 7164L20DB requires CS1 LOW and CS2 HIGH for active operation. If CS1 goes HIGH or CS2 goes LOW, the device enters low-power standby mode. Per the Truth Table (2967 tbl 02), CS2 has priority: CS2 LOW forces standby regardless of CS1 state, but CS1 HIGH alone does not override an active CS2 HIGH condition.

Is the 7164L20DB still recommended for new designs?

Yes - unlike earlier IDT-branded versions, the Renesas-rebranded 7164L20DB (Rev. Jul.30.20) carries no "Not recommended for new designs" notice. The 08/09/00 advisory was formally removed in the 02/01/01 revision, and current datasheet status confirms active support for defense and industrial programs requiring long-term supply assurance.

7164L20DB Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 28-CDIP (0.600", 15.24mm)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Memory Type:: Volatile

Memory Format:: SRAM

Technology:: SRAM - Asynchronous

Memory Size:: 64Kbit

Memory Organization:: 8K x 8

Memory Interface:: Parallel

Clock Frequency:: -

Write Cycle Time - Word, Page:: 20ns

Access Time:: 20 ns

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: -55°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 28-CDIP

7164L20DB FAQ

1.How can I place an order for 7164L20DB through Aetrix?

Please submit a Request for Quotation (RFQ) for 7164L20DB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 7164L20DB reliable?

The price and inventory of 7164L20DB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7164L20DB is usually 5 days.

3.What payment methods are accepted for 7164L20DB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7164L20DB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 7164L20DB?

7164L20DB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 7164L20DB order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 7164L20DB?

For technical support, including 7164L20DB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7164L20DB requirements.

6.How does Aetrix verify that 7164L20DB is sourced from the original manufacturer or authorized distributors?

All 7164L20DB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 7164L20DB meets industry standards.

7.What is the process for return or replacement of 7164L20DB?

All 7164L20DB units undergo pre-shipment inspection (PSI). If there is an issue with 7164L20DB, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 7164L20DB part is unused and in its original packaging.

Return procedure for 7164L20DB:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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