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Renesas 7164S85DB
- Part No.:
- 7164S85DB
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-CDIP (0.600", 15.24mm)
- Datasheet:
-
7164S85DB.pdf
- Description:
- IC SRAM 64KBIT PARALLEL 28CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,905
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Product details
Overview
7164S85DB from Renesas Electronics is a 64K (8K × 8-bit) high-speed CMOS static RAM with 85 ns maximum address access time, TTL-compatible I/O, three-state outputs, and single 5V supply operation. It features automatic low-power standby mode triggered by chip select logic and is designed for military-grade embedded systems requiring reliable non-refreshing memory in harsh environments.
For engineers reviewing the 7164S85DB datasheet, 7164S85DB pinout, 7164S85DB application, or 7164S85DB equivalent, this page delivers verified timing parameters, military-qualified package details (28-pin CERDIP), DC/AC electrical specs across –55°C to +125°C, and real-world design context for legacy avionics, defense computing, and industrial control subsystems.
Technical Context
The 7164S85DB implements fully static asynchronous architecture-no clocks or refresh required-and uses dual chip select (CS1/CS2) with hierarchical power-down: CS2 asserts standby independently of CS1, while CS1 alone enables active read/write. Its memory array is organized as 8,192 words × 8 bits, decoded via standard address lines A0–A12.
Input and output buffers are TTL-compatible (VIH ≥ 2.2 V, VIL ≤ 0.8 V), supporting direct interfacing with legacy 5V logic families. The device supports two distinct read cycles (No. 1 and No. 2) and two write cycles (WE-controlled and CS-controlled), each with defined setup/hold, access, and transition timing windows validated per MIL-STD-883 Class B.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 8K × 8-bit (65,536 bits), enabling byte-wide data bus interface without external multiplexing |
| Access Time (tAA) | 85 ns max at VCC = 5.0 V ±10%, TA = –55°C to +125°C - defines minimum clock-to-data valid delay in synchronous systems |
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with regulated 5V rails and tolerance to board-level ripple |
| Operating Temperature | –55°C to +125°C - qualified per MIL-STD-883 Class B for deployment in airborne, ground vehicle, and shipboard electronics |
| Standby Current (ISB) | 2 mA max (MIL grade) - enables low-quiescent power hold mode during processor sleep or system idle states |
| Output Drive | IOL = 10 mA / VOH = 2.4 V @ VCC min - sufficient to drive 10 TTL loads or terminate short PCB traces without buffering |
| Package | 28-pin 600 mil CERDIP (CD28) - hermetically sealed ceramic package with proven reliability in high-reliability, long-lifecycle programs |
Pinout & Package
7164S85DB is housed in a 28-pin 600 mil CERDIP (CD28) package: ceramic dual in-line, 0.600-inch body width, 0.300-inch lead spacing, hermetic seal, and MIL-STD-883 Class B qualification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A12 | Address Inputs | 13-bit binary address bus selecting one of 8,192 memory locations; latched on CS1/CS2 activation |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface; high-impedance when CS inactive or OE/WE assert disable conditions |
| CS1, CS2 | Chip Select Inputs | CS1 LOW + CS2 HIGH enables device; CS2 LOW forces standby regardless of CS1 state - provides fail-safe power gating |
| WE | Write Enable | Active LOW; controls write cycle initiation and data latch timing - must overlap with active chip select window |
| OE | Output Enable | Active LOW; gates output drivers only - does not affect internal memory state or power mode |
| VCC, GND | Power Supply | Single 5V supply with dedicated ground pin; decoupling required within 1 inch per MIL-HDBK-454A |
| NC | No Connect | Pin 13 is unconnected; must remain floating - no internal bond wire or circuit connection |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Standby Mode | Enters low-power ISB ≤ 2 mA when CS1 HIGH or CS2 LOW - eliminates need for external power management logic |
| TTL-Compatible I/O | VIH ≥ 2.2 V, VIL ≤ 0.8 V, VOH ≥ 2.4 V @ IOL = 10 mA - interoperates directly with 74LS, 74F, and other 5V TTL families without level shifters |
| Three-State Outputs | High-impedance I/O0–I/O7 during deselect or OE HIGH - prevents bus contention in multi-device memory systems |
| MIL-STD-883 Class B Compliance | Qualified for screening including temperature cycling, mechanical shock, and steady-state life testing - meets requirements for Level B military hardware |
| Single 5V Supply Operation | No auxiliary voltages required - simplifies power delivery architecture and reduces BOM count in legacy 5V systems |
Applications
| Avionics Flight Control Computers | Tactical Radio Baseband Processing |
|---|---|
Use Scenario: Real-time storage of sensor fusion coefficients and flight envelope limits in DO-254-certified hardware. IC Role / Device Role / Timing Role: Non-volatile configuration memory holding critical lookup tables accessed at sub-100 ns latency during servo loop execution. Use Value: 85 ns tAA ensures deterministic read response within tight 200 ns control cycle budgets; CERDIP packaging withstands vibration and thermal shock. |
Use Scenario: Buffering of encrypted voice frames between RF front-end and DSP engine in manpack radios operating at –40°C to +71°C. IC Role / Device Role / Timing Role: High-reliability scratchpad RAM for intermediate signal processing results, isolated from main processor bus. Use Value: MIL-qualified temperature range and 2 mA ISB support extended battery operation in field-deployed units without thermal derating. |
| Naval Sonar Signal Processors | Armored Vehicle Mission Computers |
Use Scenario: Storing calibrated transducer response profiles and beamforming weights in submarine sonar arrays exposed to salt fog and pressure cycling. IC Role / Device Role / Timing Role: Static RAM providing glitch-free data retention during power brownouts caused by engine cranking or EMI events. Use Value: Hermetic CD28 package prevents moisture ingress; no refresh requirement avoids timing vulnerability during transient supply dips. |
Use Scenario: Supporting real-time OS kernel stacks and interrupt vectors in mission-critical vehicle control units deployed in desert and arctic environments. IC Role / Device Role / Timing Role: Primary working memory for safety-critical firmware executing under ASIL-D constraints. Use Value: MIL-STD-883 screening validates long-term parametric stability; 8K × 8 organization matches typical ARM7/SH-4 cache line sizes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY62167EV30LL-85BAXI | 16Mbit (2M × 8) density, 3.3V core, SOIC-32 package - higher capacity but incompatible voltage and footprint | Targets modern low-power embedded systems; lacks MIL-STD-883 qualification and extended temperature validation | Select only if redesigning for 3.3V architecture and requiring >64K memory; not drop-in compatible |
| AS6C8008-85ZIN | 64K × 8-bit, 5V, 85 ns, SOJ-28 - same logic and timing but commercial/industrial temp only (–40°C to +85°C), non-hermetic plastic package | Suitable for cost-sensitive industrial controllers where military screening and extreme temperature are not required | Use where CERDIP reliability is unnecessary and RoHS-compliant plastic packaging suffices |
Compared with 7164S85DB, CY62167EV30LL-85BAXI offers greater density but requires full system voltage and layout redesign, while AS6C8008-85ZIN provides identical functionality at lower cost and risk for non-military applications - neither replicates the hermetic, MIL-qualified assurance of the 7164S85DB.
Availability
7164S85DB is available at Aetrix Electronics and suitable for avionics, naval electronics, and armored vehicle systems requiring stable component supply across extended product lifecycles and rigorous environmental certification.
Supply support for 7164S85DB 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 delivering microcontrollers, analog, power, and memory solutions for automotive, industrial, infrastructure, and IoT applications.
The 7164S85DB belongs to Renesas' legacy high-reliability SRAM product line, engineered specifically for military and aerospace systems demanding guaranteed performance over extreme temperature ranges and long operational lifetimes.
FAQ
What is the maximum operating temperature range certified for the 7164S85DB?
The 7164S85DB is qualified for operation from –55°C to +125°C per MIL-STD-883 Class B screening. This range is explicitly confirmed in the "Recommended Operating Temperature and Supply Voltage" table (2967 tbl 03) and applies to all speed grades including the 85 ns variant. No derating is required within this span.
Does the 7164S85DB require an external clock or refresh circuitry?
No, the 7164S85DB is a fully static RAM and requires no clock or refresh signals. Its internal circuitry maintains data indefinitely as long as VCC remains within specification and CS inputs are properly managed. This is stated in the Description section: "Fully static asynchronous circuitry is used, requiring no clocks or refreshing for operation."
What package type does the 7164S85DB use, and is it hermetically sealed?
The 7164S85DB uses a 28-pin 600 mil CERDIP package (package code CD28), which is a ceramic dual in-line package with a hermetic metal-glass seal. This is confirmed in the Ordering Information table (page 10) and Pin Configurations diagram (2967 drw 02), and supports MIL-STD-883 Class B compliance.
How does chip select logic work on the 7164S85DB, and what happens during standby?
The 7164S85DB uses two chip selects: CS1 and CS2. The device is selected only when CS1 is LOW and CS2 is HIGH. If CS2 goes LOW, the device enters standby regardless of CS1 state; if CS1 goes HIGH while CS2 is HIGH, standby also activates. Standby reduces ICC to ≤2 mA (MIL grade) as specified in DC Electrical Characteristics (2967 tbl 07).
Is the 7164S85DB pin-compatible with other members of the IDT7164 family?
Yes, the 7164S85DB shares identical pinout and function mapping with all IDT7164S/L variants in the same package type (e.g., 7164S20DB, 7164L85DB), as confirmed by the unified Pin Descriptions and Pin Configurations sections covering the entire 7164S/L family. Signal names (A0–A12, I/O0–I/O7, CS1, CS2, WE, OE, VCC, GND, NC) and positions are consistent across speed and power variants in CD28.
7164S85DB 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:
- 85ns
- Access Time:
- 85 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
7164S85DB FAQ
1.How can I place an order for 7164S85DB through Aetrix?
Please submit a Request for Quotation (RFQ) for 7164S85DB 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 7164S85DB reliable?
The price and inventory of 7164S85DB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7164S85DB is usually 5 days.
3.What payment methods are accepted for 7164S85DB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7164S85DB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7164S85DB?
7164S85DB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7164S85DB 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 7164S85DB?
For technical support, including 7164S85DB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7164S85DB requirements.
6.How does Aetrix verify that 7164S85DB is sourced from the original manufacturer or authorized distributors?
All 7164S85DB 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 7164S85DB meets industry standards.
7.What is the process for return or replacement of 7164S85DB?
All 7164S85DB units undergo pre-shipment inspection (PSI). If there is an issue with 7164S85DB, 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 7164S85DB part is unused and in its original packaging.
Return procedure for 7164S85DB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7164S85DB Tags
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