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Renesas 7164S55DB
- Part No.:
- 7164S55DB
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-CDIP (0.600", 15.24mm)
- Datasheet:
-
7164S55DB.pdf
- Description:
- IC SRAM 64KBIT PARALLEL 28CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,262
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Product details
Overview
The 7164S55DB from Renesas Electronics is a military-grade 64K (8K × 8-bit) CMOS static RAM with 55 ns maximum address access time, TTL-compatible I/O, and three-state outputs. It operates from a single 5V supply, supports standby power-down via CS1/CS2 control, and is packaged in a 28-pin 600 mil CERDIP (CD28) compliant with MIL-STD-883 Class B for high-reliability embedded systems.
For engineers reviewing the 7164S55DB datasheet, 7164S55DB pinout, 7164S55DB application, or 7164S55DB equivalent, this page delivers verified timing specs, military temperature range validation (–55°C to +125°C), DC/AC electrical characteristics, and precise package mapping - critical for avionics, defense computing, and ruggedized data buffering designs.
Technical Context
The 7164S55DB implements fully static asynchronous operation-no clocks or refresh required-and uses dual chip select logic (CS1 active-low, CS2 active-high) to enable low-power standby mode when either CS1 is HIGH or CS2 is LOW. Its memory array is organized as 8,192 × 8 bits with address decoding across A0–A12.
Input and output signals are TTL-compatible (VIH = 2.2 V min, VIL = 0.8 V max), and all I/Os feature three-state drivers controlled by OE and WE. Write operations are enabled only when CS1 = LOW, CS2 = HIGH, and WE = LOW; read operations require OE = LOW while maintaining valid chip select conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 8K × 8-bit (65,536 bits), enabling byte-wide data bus interfacing without external multiplexing |
| Access Time (tAA) | 55 ns max at VCC = 5.0 V ±10%, TA = –55°C to +125°C - defines minimum clock-to-data setup for synchronous controllers |
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with legacy 5V TTL logic families and simplifies power rail design |
| Standby Current (ISB) | 2 mA max (MIL grade) - enables ultra-low power retention during system sleep modes |
| Operating Temperature | –55°C to +125°C - validated per MIL-STD-883 Class B for deployment in harsh environmental conditions |
| I/O Interface | TTL-compatible inputs and three-state outputs - eliminates level-shifting requirements in mixed-logic systems |
| Package | 28-pin 600 mil CERDIP (CD28) - hermetically sealed ceramic package for long-term reliability in high-vibration/moisture environments |
Pinout & Package
Package: 28-pin 600 mil CERDIP (CD28), hermetically sealed ceramic dual in-line package with 0.6-inch body width, compliant with MIL-STD-883 Class B screening.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A12 | Address Inputs | 13-bit address bus supporting full 8K word selection; no internal latching - requires stable address prior to CS activation |
| I/O0–I/O7 | Bidirectional Data Bus | Three-state TTL-compatible data lines; direction controlled by WE (write) and OE (read) - enables shared bus architecture |
| CS1 | Chip Select 1 | Active-low primary enable; device enters standby if CS1 = HIGH, regardless of CS2 state |
| CS2 | Chip Select 2 | Active-high secondary enable; CS2 = LOW forces standby even if CS1 = LOW - provides hierarchical power control |
| WE | Write Enable | Active-low write strobe; write cycle initiated only when CS1 = LOW, CS2 = HIGH, and WE = LOW |
| OE | Output Enable | Active-low read control; places I/O pins in high-impedance state when HIGH - prevents bus contention during writes |
| VCC | Power Supply | +5 V supply pin; decoupling capacitor required within 0.5 inch to minimize noise-induced read errors |
| GND | Ground Reference | Signal and power ground return; must be connected to low-impedance system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| High-speed access | 55 ns max tAA enables integration into 18 MHz bus systems without wait states |
| Dual chip select power management | Independent CS1/CS2 logic reduces standby current to 2 mA without external circuitry |
| MIL-STD-883 Class B compliance | Full military screening including burn-in, temperature cycling, and hermeticity testing ensures field reliability |
| TTL-compatible interface | Direct connection to 74LS/74F logic families eliminates level translators and saves board space |
| Single 5V supply operation | Eliminates need for dual-rail regulators, reducing BOM cost and PCB complexity in legacy military platforms |
Applications
| Avionics Flight Control Memory | Tactical Radio Buffer Storage |
|---|---|
Use Scenario: Real-time storage of sensor fusion data and flight command history in fly-by-wire systems requiring deterministic latency. IC Role / Device Role / Timing Role: Primary SRAM buffer interfaced directly to a 16-bit microcontroller bus operating at 12 MHz. Use Value: 55 ns access time guarantees sub-cycle data availability; MIL-STD-883 packaging withstands vibration and thermal shock up to 20 g and –55°C/+125°C. | Use Scenario: Temporary packet buffering in encrypted HF/VHF radios deployed in mobile command vehicles. IC Role / Device Role / Timing Role: Standby-enabled data scratchpad synchronized to burst-mode transmit/receive cycles. Use Value: Dual CS power-down reduces average current draw to <5 mA during idle intervals; TTL compatibility avoids signal integrity issues on long backplane traces. |
| Secure Embedded Crypto Module | Ruggedized Industrial PLC Data Log |
Use Scenario: Storing ephemeral key material and intermediate cipher blocks in FIPS 140-2 Level 3 certified hardware security modules. IC Role / Device Role / Timing Role: Isolated memory bank accessed only during cryptographic operation windows. Use Value: Hermetic CD28 package prevents tampering-induced data leakage; 5V-only operation simplifies isolated power domain design. | Use Scenario: Logging machine status and fault codes in oilfield SCADA controllers exposed to wide ambient swings. IC Role / Device Role / Timing Role: Non-refreshed data logger co-located with an 8051-based controller on a single PCB. Use Value: Guaranteed operation from –55°C to +125°C eliminates derating concerns; 28-pin DIP footprint allows manual replacement in field-deployed units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY62167EV30LL-55ZSXI | 3.3V core, 55 ns access, 28-pin SOIC; lower power but incompatible voltage domain | Requires level-shifting or separate 3.3V rail; unsuitable for legacy 5V-only systems | Select only if migrating to modern low-voltage architecture with redesign allowance |
| AS6C4008-55ZIN | 5V, 55 ns, 28-pin SOJ; commercial temp range (0°C to +70°C), no MIL-STD-883 screening | Lacks military qualification and extended temperature support; limited to benign environments | Acceptable for cost-sensitive non-military prototypes where qualification is not required |
Compared with CY62167EV30LL-55ZSXI and AS6C4008-55ZIN, the 7164S55DB uniquely delivers 5V TTL compatibility, MIL-STD-883 Class B certification, and guaranteed –55°C to +125°C operation - making it irreplaceable in fielded defense electronics where voltage stability and environmental hardening are non-negotiable.
Availability
The 7164S55DB is available at Aetrix Electronics and suitable for avionics data buffering, tactical radio memory, secure crypto module storage, and ruggedized industrial PLC logging requiring stable component supply across extended lifecycle programs.
Supply support for 7164S55DB 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 7164S55DB belongs to Renesas' legacy high-reliability SRAM product line, designed specifically for military and aerospace applications demanding extended temperature operation, hermetic packaging, and rigorous process controls.
FAQ
What is the maximum operating temperature range supported by the 7164S55DB?
The 7164S55DB is rated for operation from –55°C to +125°C and is fully qualified to MIL-STD-883 Class B standards. This specification is validated across all AC and DC parameters in the datasheet, including access time, standby current, and I/O voltage thresholds - ensuring reliable performance in extreme environmental conditions typical of airborne and ground vehicle systems.
Does the 7164S55DB require a refresh circuit or clock signal?
No, the 7164S55DB is a fully static RAM and requires no refresh circuit or clock signal. Its internal design uses static CMOS latches for data storage, allowing indefinite data retention as long as power is applied and chip select conditions are met. This eliminates timing-critical refresh overhead in microcontroller or FPGA-based systems.
Is the 7164S55DB pin-compatible with other members of the IDT7164 family?
Yes, the 7164S55DB shares identical pinout and functional behavior with all IDT7164 variants in the CD28 package, including 7164S20DB, 7164S25DB, and 7164L55DB. Address, data, control, and power pins are mapped identically - enabling speed-bin upgrades or low-power substitutions without PCB modification.
What is the standby current consumption of the 7164S55DB under military conditions?
Under military-grade operating conditions (–55°C to +125°C), the 7164S55DB draws a maximum standby current (ISB) of 2 mA when CS1 is HIGH or CS2 is LOW. This value is guaranteed across temperature and voltage extremes per the datasheet's DC Electrical Characteristics table and applies to both standard and low-power versions in CD28 packaging.
Can the 7164S55DB be used with modern 3.3V microcontrollers?
The 7164S55DB is strictly a 5V-only device with TTL-compatible input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V). While its outputs meet 3.3V logic high minimums, direct connection to 3.3V-only microcontrollers risks violating input voltage limits on the controller side. A level-shifter or bus transceiver is required for safe interoperability in mixed-voltage systems.
7164S55DB 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:
- 55ns
- Access Time:
- 55 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
7164S55DB FAQ
1.How can I place an order for 7164S55DB through Aetrix?
Please submit a Request for Quotation (RFQ) for 7164S55DB 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 7164S55DB reliable?
The price and inventory of 7164S55DB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7164S55DB is usually 5 days.
3.What payment methods are accepted for 7164S55DB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7164S55DB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7164S55DB?
7164S55DB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7164S55DB 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 7164S55DB?
For technical support, including 7164S55DB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7164S55DB requirements.
6.How does Aetrix verify that 7164S55DB is sourced from the original manufacturer or authorized distributors?
All 7164S55DB 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 7164S55DB meets industry standards.
7.What is the process for return or replacement of 7164S55DB?
All 7164S55DB units undergo pre-shipment inspection (PSI). If there is an issue with 7164S55DB, 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 7164S55DB part is unused and in its original packaging.
Return procedure for 7164S55DB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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