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Renesas 71256SA12YG8
- Part No.:
- 71256SA12YG8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-BSOJ (0.300", 7.62mm Width)
- Datasheet:
-
71256SA12YG8.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOJ
- Quantity:
- Payment:
- Shipping:
Inventory:4,997
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Product details
Overview
71256SA12YG8 from Renesas Electronics is a 32K × 8-bit (262,144-bit) high-speed CMOS static RAM with 12 ns access time, TTL-compatible I/O, single 5 V supply operation, and industrial-grade SOJ-28 packaging. It serves as a non-refreshing, fully static memory buffer in real-time control systems requiring deterministic timing and low-latency data access.
For engineers reviewing the 71256SA12YG8 datasheet, 71256SA12YG8 pinout, 71256SA12YG8 application, or 71256SA12YG8 equivalent, this device is evaluated for use in legacy industrial controllers, avionics data recorders, and FPGA configuration memory where guaranteed 12 ns read/write cycle timing and -40°C to +85°C operational stability are required.
Technical Context
The 71256SA12YG8 implements asynchronous static RAM architecture with independent chip select (CS) and output enable (OE) controls, enabling fast read cycles with tAA = 12 ns and tOE = 6 ns at VCC = 5.0 V ±10%. Its bidirectional I/O pins operate without external direction logic, directly interfacing with TTL-level microcontrollers and FPGAs.
All timing parameters-including tWC = 12 ns write cycle, tDW = 6 ns data valid-to-write-end, and tWHZ = 6 ns write-enable-to-high-Z-are specified over the full industrial temperature range (-40°C to +85°C), confirming deterministic behavior under thermal stress without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (262,144-bit total); supports byte-wide parallel data transfers without address multiplexing |
| Access Time (tAA) | 12 ns max; guarantees worst-case read latency from address assertion to valid data on I/O bus |
| Supply Voltage | 4.5 V to 5.5 V; compatible with standard 5 V logic rails and tolerant of ±10% regulation variation |
| Operating Temperature | -40°C to +85°C; validated for continuous operation in uncontrolled industrial environments |
| Standby Current (ISB1) | 15 mA max at CMOS-level chip deselect; enables ultra-low-power sleep mode when CS > VHC |
| I/O Compatibility | TTL-compatible inputs/outputs; eliminates need for level-shifting circuitry when interfacing with legacy 5 V microcontrollers |
| Package | 28-pin 300-mil Plastic SOJ (PJG28); surface-mountable with industry-standard footprint and reflow profile |
Pinout & Package
71256SA12YG8 is housed in a 28-pin 300-mil Plastic SOJ (PJG28) package with gull-wing leads, optimized for high-density PCB layouts and automated assembly. Pin 1 is marked by a notch or dot per JEDEC MO-025B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus accepting full 32K address space; no address latching required |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit TTL-compatible data path; direction controlled implicitly by CS/OE/WE states |
| CS | Chip Select | Active-low enable for memory access; asserts internal power-up (tPU) and deasserts standby (tPD) |
| OE | Output Enable | Active-low control for output drivers; enables fast 6 ns read access independent of CS timing |
| WE | Write Enable | Active-low signal initiating write cycle; defines tWP (8 ns min) and tDW (6 ns) timing windows |
| VCC | Power Supply | +5 V supply input; decoupling required within 10 mm of pin per high-speed RAM layout guidelines |
| GND | Ground Reference | Signal and power ground return; requires dedicated low-impedance plane connection |
Key Features
| Feature | Design Value |
|---|---|
| 12 ns Read Access Time | Enables direct interface with 80 MHz CPU buses without wait states in synchronous systems |
| CMOS-Level Standby Mode (ISB1) | Reduces quiescent current to 15 mA when CS held above VHC, supporting low-power idle states |
| TTL-Compatible I/O | Eliminates external bus transceivers when connecting to legacy 5 V microcontrollers or CPLDs |
| Asynchronous Operation | Requires no clock, refresh controller, or external timing circuitry-reduces BOM count and design complexity |
| Industrial Temperature Range | Validated operation from -40°C to +85°C ensures reliability in motor drives, railway signaling, and outdoor equipment |
Applications
| Industrial PLC Memory Buffer | FPGA Configuration Storage |
|---|---|
|
Use Scenario: Storing real-time I/O mapping tables and ladder logic state variables in programmable logic controllers deployed in factory automation cabinets. IC Role / Device Role / Timing Role: Non-volatile-equivalent SRAM acting as fast-access working memory for scan-cycle execution with sub-20 ns deterministic latency. Use Value: Eliminates DRAM refresh overhead and guarantees consistent 12 ns read/write timing across temperature extremes, preventing scan jitter in safety-critical motion control loops. |
Use Scenario: Holding configuration bitstreams for Xilinx Spartan-3 and Altera Cyclone II FPGAs during cold-start initialization sequences. IC Role / Device Role / Timing Role: Parallel-programmable configuration memory providing byte-aligned data to FPGA's slave parallel interface during power-on reset. Use Value: Supports 12 ns tAA and tWC timing margins required by FPGA configuration clocks up to 40 MHz, ensuring reliable bitstream loading without retries. |
| Avionics Data Recorder Cache | Medical Imaging Frame Buffer |
|
Use Scenario: Caching high-speed sensor telemetry (e.g., inertial measurement unit outputs) before compression and storage in flight data recorders. IC Role / Device Role / Timing Role: High-reliability SRAM buffer absorbing burst data rates up to 83 MB/s via 8-bit parallel bus with zero wait states. Use Value: Industrial-grade temperature rating and 15 mA ISB1 current allow continuous operation in pressurized avionics bays without forced cooling or derating. |
Use Scenario: Temporary storage of digitized ultrasound or endoscopic video frames prior to JPEG compression and display rendering in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-latency frame buffer enabling real-time pixel pipeline processing with minimal FIFO depth requirements. Use Value: TTL-compatible I/O and 12 ns access time reduce interface logic count and support 50+ fps frame capture at 640×480 resolution without frame drop. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY62128ELL-12ZSXI | 12 ns access, 32K × 8, but uses 28-pin TSOP-II (SOIC-28 compatible) instead of SOJ; higher ICC (170 mA vs. 160 mA) | Preferred for new designs using fine-pitch surface-mount assembly lines optimized for TSOP; not pin-compatible with PJG28 footprint | Select if board layout supports TSOP-II and lower standby current is not critical |
| AS6C4008-12TIN | 12 ns access, same 32K × 8 organization, but rated only for commercial temp (0°C to +70°C); ISB1 = 25 mA | Suitable for cost-sensitive consumer test equipment or lab instruments operating in climate-controlled environments | Choose only when industrial temperature range is not required and PCB space allows SOJ-to-SOIC adapter |
Compared with CY62128ELL-12ZSXI and AS6C4008-12TIN, the 71256SA12YG8 uniquely delivers industrial temperature validation, SOJ-28 compatibility, and 15 mA ISB1 in a single package-making it the sole option for retrofitting legacy SOJ-based industrial controllers without board redesign.
Availability
71256SA12YG8 is available at Aetrix Electronics and suitable for industrial PLC memory buffers, FPGA configuration storage, avionics data recorder caches, and medical imaging frame buffers requiring stable component supply across extended product lifecycles.
Supply support for 71256SA12YG8 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 71256SA series was developed as a high-reliability, drop-in replacement for legacy 28-pin SRAMs in mission-critical industrial systems-emphasizing timing consistency, wide temperature operation, and long-term manufacturability.
FAQ
What is the maximum operating frequency supported by the 71256SA12YG8?
The 71256SA12YG8 does not operate on a clock signal-it is an asynchronous SRAM. Its maximum effective data rate is determined by its 12 ns read/write cycle time (tRC), enabling up to 83.3 MHz sustained throughput on the 8-bit bus. This corresponds to a theoretical bandwidth of 666.7 MB/s when continuously cycling addresses, though real-world system timing margins typically limit practical usage to ≤40 MHz bus interfaces.
Does the 71256SA12YG8 require external refresh circuitry?
No, the 71256SA12YG8 is a fully static RAM and requires no refresh circuitry. Its CMOS memory array retains data indefinitely as long as VCC remains within 4.5 V–5.5 V and ambient temperature stays within -40°C to +85°C. This eliminates refresh-related timing constraints and simplifies integration into microcontroller- or FPGA-based systems lacking dedicated DRAM controllers.
Is the 71256SA12YG8 pin-compatible with earlier IDT-branded versions?
Yes, the 71256SA12YG8 maintains identical pinout, electrical characteristics, and timing specifications as the original IDT71256SA12YG8. Renesas acquired IDT's memory business and continues manufacturing this part under the same ordering code, datasheet revision, and qualification standards-ensuring seamless drop-in replacement in existing designs.
What is the meaning of the 'YG8' suffix in 71256SA12YG8?
In the 71256SA12YG8 ordering code, 'YG' denotes the 28-pin 300-mil Plastic SOJ package (PJG28), and '8' indicates tape-and-reel packaging format (8 mm carrier tape, 1,000 units per reel). This distinguishes it from the tube-packaged 71256SA12YG variant and confirms compliance with automated SMT placement requirements.
Can the 71256SA12YG8 be used with 3.3 V logic systems?
No-the 71256SA12YG8 is strictly a 5 V-only device. Its VIH minimum is 2.2 V and VIL maximum is 0.8 V, but VCC must be 4.5–5.5 V. Interfacing with 3.3 V systems requires level-shifting circuitry on all address, control, and data lines; direct connection risks latch-up or data corruption due to underspecified supply voltage and incompatible noise margins.
71256SA12YG8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-BSOJ (0.300", 7.62mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Asynchronous
- Memory Size:
- 256Kbit
- Memory Organization:
- 32K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 12ns
- Access Time:
- 12 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOJ
71256SA12YG8 FAQ
1.How can I place an order for 71256SA12YG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71256SA12YG8 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 71256SA12YG8 reliable?
The price and inventory of 71256SA12YG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71256SA12YG8 is usually 5 days.
3.What payment methods are accepted for 71256SA12YG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71256SA12YG8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71256SA12YG8?
71256SA12YG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71256SA12YG8 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 71256SA12YG8?
For technical support, including 71256SA12YG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71256SA12YG8 requirements.
6.How does Aetrix verify that 71256SA12YG8 is sourced from the original manufacturer or authorized distributors?
All 71256SA12YG8 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 71256SA12YG8 meets industry standards.
7.What is the process for return or replacement of 71256SA12YG8?
All 71256SA12YG8 units undergo pre-shipment inspection (PSI). If there is an issue with 71256SA12YG8, 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 71256SA12YG8 part is unused and in its original packaging.
Return procedure for 71256SA12YG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71256SA12YG8 Tags
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