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Renesas 7164L45DB
- Part No.:
- 7164L45DB
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-CDIP (0.600", 15.24mm)
- Datasheet:
-
7164L45DB.pdf
- Description:
- IC SRAM 64KBIT PARALLEL 28CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,658
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Product details
Overview
The 7164L45DB from Renesas Electronics is a 64K (8K × 8-bit) high-speed CMOS static RAM with 45 ns maximum address access time, TTL-compatible I/O, and three-state outputs. It operates from a single 5V supply, supports battery backup data retention down to 2V, and is packaged in a 28-pin 600 mil CERDIP for military-grade reliability.
For engineers reviewing the 7164L45DB datasheet, 7164L45DB pinout, 7164L45DB application, or 7164L45DB equivalent, this device serves as a drop-in replacement for legacy SRAMs in avionics, radar signal processing, and hardened embedded controllers requiring MIL-STD-883 Class B compliance and –55°C to +125°C operation.
Technical Context
The 7164L45DB implements fully static asynchronous architecture-no clocks or refresh required-and uses dual chip select (CS1/CS2) logic to enable low-power standby mode when CS1 is HIGH or CS2 is LOW. Its L-version supports data retention at VCC ≥ 2.0V, verified across full military temperature range.
Input and output pins are TTL-compatible (VIH = 2.2V min, VIL = 0.8V max), and all timing parameters-including tAA = 45 ns, tRC = 45 ns, and tPD = 45 ns-are guaranteed under MIL-STD-883 Class B conditions at –55°C to +125°C with VCC = 5.0V ±10%.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 65,536 bits (8K × 8-bit organization), enabling byte-wide data bus interfacing without external demultiplexing. |
| Access Time (tAA) | 45 ns max at –55°C to +125°C, defining worst-case delay from valid address to stable data output. |
| Data Retention Voltage | 2.0 V min (L version only), allowing persistent memory state during brownout or battery-backup operation. |
| Supply Voltage | 4.5–5.5 V, compatible with standard 5V TTL/CMOS system rails and tolerant of ±10% regulation variation. |
| Standby Current (ISB) | 200 µA max at +125°C, enabling ultra-low power hold mode during processor sleep or system idle states. |
| Operating Temperature | –55°C to +125°C, qualified per MIL-STD-883 Class B for mission-critical aerospace and defense applications. |
| I/O Interface | TTL-compatible inputs and three-state outputs, eliminating level-shifting requirements in mixed-logic systems. |
Pinout & Package
Package: 28-pin 600 mil CERDIP (CD28), hermetically sealed ceramic dual in-line package with glass-sealed leads for moisture resistance and thermal stability in harsh environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A12 | Address Inputs | 13-bit address bus accepting 0–8191 to select one of 8K memory locations. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface supporting read and write cycles with high-impedance tri-state control via OE/CS. |
| CS1 / CS2 | Chip Select Inputs | Active-LOW CS1 and active-HIGH CS2 provide hierarchical enable logic; CS2 powers down CS1 but not vice versa. |
| WE | Write Enable | Active-LOW control that gates write operations; high during reads to maintain output drivers in enabled state. |
| OE | Output Enable | Active-LOW signal enabling data output drivers; high-Z when deasserted to prevent bus contention. |
| VCC / GND | Power Supply | Single 5V supply with dedicated ground pin; decoupling required within 10 mm for noise immunity in high-speed operation. |
| NC | No Connect | Pin 13 is unconnected internally; must remain floating or tied to ground per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage data retention | Operates down to 2.0V VCC while preserving stored data-critical for battery-backed systems during main power loss. |
| Dual chip select power management | Automatic transition to standby mode (ISB ≤ 200 µA) when CS1 = HIGH or CS2 = LOW, reducing system-level power by >95% vs active mode. |
| MIL-STD-883 Class B qualification | Includes temperature cycling, mechanical shock, vibration, and burn-in testing-ensuring reliability in launch, flight, and battlefield environments. |
| Asynchronous static architecture | No clock, no refresh, no wait states-simplifies timing design and eliminates hidden latency or refresh-induced jitter in real-time control loops. |
| TTL-compatible I/O | Direct interface with legacy 5V microcontrollers, FPGAs, and ASICs without level translators, reducing BOM count and PCB area. |
Applications
| Avionics Flight Control Unit | Radar Signal Processing Buffer |
|---|---|
Use Scenario: Real-time storage of sensor fusion data and actuator command history in fly-by-wire systems operating at –55°C to +125°C. IC Role / Device Role / Timing Role: Non-volatile scratchpad memory holding critical telemetry and control state between processor wake cycles. Use Value: 45 ns access time enables sub-microsecond response to attitude correction commands; 2V retention preserves integrity during transient power faults. | Use Scenario: Intermediate buffering of digitized RF samples in airborne pulse-Doppler radar front ends before FFT processing. IC Role / Device Role / Timing Role: High-speed, deterministic-access FIFO buffer synchronized to ADC clock domains without dynamic memory arbitration. Use Value: TTL-compatible I/O eliminates level-shifting delays; MIL-qualified packaging withstands vibration and thermal shock during aircraft maneuvers. |
| Secure Military Communications Module | Hardened Industrial PLC Memory |
Use Scenario: Storing encrypted key material and session buffers in SATCOM modems deployed in desert or arctic operational theaters. IC Role / Device Role / Timing Role: Tamper-resistant volatile memory with guaranteed data persistence during intentional power interruption attacks. Use Value: 2V retention voltage ensures keys remain intact through 100 ms brownouts; CERDIP package resists humidity-induced leakage and ESD events. | Use Scenario: Program and data storage for safety-critical ladder logic execution in oil refinery DCS controllers exposed to ambient temperatures up to +85°C. IC Role / Device Role / Timing Role: Deterministic-access working memory for real-time I/O scanning and PID loop updates. Use Value: 45 ns access time meets <100 ns scan cycle budgets; industrial-grade variants support extended temperature operation without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 7164S45DB | Standard power version (ICC active = 110 mA max vs L-version's 90 mA); no 2V data retention capability. | Suitable for non-battery-backed systems where standby current is less critical than cost or availability. | Select when power budget allows higher ISB and data retention during power loss is unnecessary. |
| AS6C4008-45TIN | 45 ns access, 8K × 8-bit, but rated only for industrial temp (–40°C to +85°C); no MIL-STD-883 qualification. | Applicable in commercial/industrial edge devices where military reliability and extended temperature are not mandated. | Choose for cost-sensitive designs lacking environmental stress requirements or formal qualification mandates. |
Compared with 7164S45DB and AS6C4008-45TIN, the 7164L45DB uniquely delivers military-grade reliability, 2V data retention, and ultra-low standby current-making it the sole option for safety-critical, battery-backed, or extreme-environment deployments.
Availability
The 7164L45DB is available at Aetrix Electronics and suitable for avionics, radar signal processing, and secure communications systems requiring stable component supply across long product lifecycles and stringent environmental certifications.
Supply support for 7164L45DB 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 IDT7164 family-now part of Renesas' legacy high-reliability memory portfolio-was designed specifically for military, aerospace, and industrial applications demanding guaranteed performance across extreme temperature ranges and long-term obsolescence resilience.
FAQ
What is the maximum operating temperature range for the 7164L45DB?
The 7164L45DB is qualified for operation from –55°C to +125°C per MIL-STD-883 Class B. This full military temperature range is guaranteed for all electrical parameters including access time, standby current, and data retention, making it suitable for deployment in jet engines, missile guidance systems, and space-qualified platforms where thermal extremes are routine.
Does the 7164L45DB support true battery backup operation?
Yes-the 7164L45DB supports true battery backup operation with guaranteed data retention at VCC ≥ 2.0V across its full military temperature range. This is a defining feature of the "L" (low-power) variant, enabling persistent memory state during main power failure without external circuitry or supercapacitors.
Is the 7164L45DB pin-compatible with other 7164 variants like the 7164S45DB?
Yes-the 7164L45DB is pin-compatible and functionally identical to the 7164S45DB in the same CD28 package, differing only in power consumption and data retention capability. Both share identical pinout, timing behavior, and logic interface, allowing direct substitution where 2V retention is not required.
What package type does the 7164L45DB use, and why is it significant?
The 7164L45DB uses a 28-pin 600 mil CERDIP (CD28) package-hermetically sealed ceramic with glass-sealed leads. This construction provides superior moisture resistance, thermal stability, and long-term reliability in high-humidity, high-vibration, or radiation-prone environments typical of defense and aerospace applications.
Can the 7164L45DB be used in new designs despite its legacy status?
Yes-the 7164L45DB remains actively supported by Renesas with documented availability, traceable sourcing, and lifecycle management. While originally introduced by IDT, it is now part of Renesas' qualified legacy portfolio and continues to be manufactured and tested to MIL-STD-883 standards for new program integration where proven reliability outweighs newer alternatives.
7164L45DB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-CDIP (0.600", 15.24mm)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- 45ns
- Access Time:
- 45 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
7164L45DB FAQ
1.How can I place an order for 7164L45DB through Aetrix?
Please submit a Request for Quotation (RFQ) for 7164L45DB 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 7164L45DB reliable?
The price and inventory of 7164L45DB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7164L45DB is usually 5 days.
3.What payment methods are accepted for 7164L45DB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7164L45DB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7164L45DB?
7164L45DB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7164L45DB 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 7164L45DB?
For technical support, including 7164L45DB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7164L45DB requirements.
6.How does Aetrix verify that 7164L45DB is sourced from the original manufacturer or authorized distributors?
All 7164L45DB 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 7164L45DB meets industry standards.
7.What is the process for return or replacement of 7164L45DB?
All 7164L45DB units undergo pre-shipment inspection (PSI). If there is an issue with 7164L45DB, 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 7164L45DB part is unused and in its original packaging.
Return procedure for 7164L45DB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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