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Renesas 71256SA15YGI8
- Part No.:
- 71256SA15YGI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-BSOJ (0.300", 7.62mm Width)
- Datasheet:
-
71256SA15YGI8.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOJ
- Quantity:
- Payment:
- Shipping:
Inventory:2,958
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Product details
Overview
71256SA15YGI8 from Renesas Electronics is a 32K × 8-bit (262,144-bit) high-speed CMOS static RAM with industrial temperature range (–40°C to +85°C), 15 ns access time, TTL-compatible I/O, single 5 V supply, and 28-pin plastic SOJ (PJG28) package. It serves as main or buffer memory in real-time control systems requiring deterministic read/write timing without refresh.
For engineers reviewing the 71256SA15YGI8 datasheet, 71256SA15YGI8 pinout, 71256SA15YGI8 application, or 71256SA15YGI8 equivalent, key selection criteria include industrial-grade reliability, 15 ns cycle time under full temperature range, low standby current (ISB = 40 mA max), and direct TTL-level interface compatibility with legacy microcontrollers and FPGAs.
Technical Context
The 71256SA15YGI8 implements fully static asynchronous operation-no clocks or refresh required-and uses dual-control enable logic with independent Chip Select (CS) and Output Enable (OE) inputs to support interleaved memory access and output tri-state management. Its address decoding is internal and fully decoded for all 15 address lines (A0–A14).
Timing is defined by overlapping CS- and WE-controlled write cycles and OE-gated read cycles, with guaranteed tCLZ ≤ 4 ns and tOHZ ≤ 7 ns at industrial temperature. Power states are managed via TTL- and CMOS-level standby modes (ISB and ISB1), delivering 40 mA and 15 mA max supply current respectively.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (262,144-bit total); supports byte-wide data bus interfacing without external demultiplexing |
| Access Time (tAA) | 15 ns max over –40°C to +85°C; ensures deterministic latency for hard real-time firmware execution |
| Supply Voltage | 4.5 V to 5.5 V; compatible with standard 5 V TTL/CMOS logic rails and legacy power domains |
| I/O Interface | TTL-compatible bidirectional data (I/O0–I/O7); eliminates level-shifter requirements in mixed-logic systems |
| Standby Current (ISB) | 40 mA max at VCC max and fMAX; enables low-power hold mode during processor sleep without memory loss |
| Operating Temperature | –40°C to +85°C; qualified for industrial automation, motor drives, and outdoor embedded controllers |
| Package | 28-pin 300-mil plastic SOJ (PJG28); surface-mount compatible with standard reflow profiles and legacy board layouts |
Pinout & Package
71256SA15YGI8 is housed in a 28-pin 300-mil plastic SOJ (PJG28) package with gull-wing leads, designed for surface-mount assembly and thermal performance up to 85°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus accepting full 32K address space; no external address latching required |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit TTL-compatible data path; direction controlled by CS and WE; high-impedance when deselected or during write |
| CS | Chip Select | Active-low enable for device selection; controls power-down (ISB/ISB1) and output disable timing (tCHZ/tCLZ) |
| WE | Write Enable | Active-low signal initiating write cycle; defines tWP (10 ns min) and tDW (7 ns min) timing windows |
| OE | Output Enable | Active-low control for output drivers only; enables fast read access (tOE ≤ 7 ns) independent of CS deassertion |
| VCC, GND | Power Supply | Single 5 V supply with dedicated ground; decoupling recommended per JEDEC MO-118 standards |
Key Features
| Feature | Design Value |
|---|---|
| Fully static asynchronous operation | No clock, no refresh, no wait states-simplifies timing-critical MCU/FPGA memory interfaces |
| Dual-enable architecture (CS + OE) | Enables simultaneous chip selection and output gating for multi-bank or shared-bus systems |
| Industrial-grade 15 ns access time | Guaranteed tAA ≤ 15 ns across full –40°C to +85°C range-not derated or typical-only |
| TTL-compatible I/O with 8 mA sink capability | Direct connection to 5 V microcontrollers (e.g., 8051, PIC18, legacy ARM7) without level translation |
| Low ISB1 standby current (15 mA max) | Supports ultra-low-power hold mode during extended idle periods while retaining memory contents |
Applications
| Industrial PLC Memory Buffer | Legacy Microcontroller Data RAM |
|---|---|
Use Scenario: Storing real-time I/O scan data and ladder logic variables in programmable logic controllers operating in factory environments. IC Role / Device Role / Timing Role: Primary 32K × 8-byte scratchpad RAM accessed asynchronously by dual-port bus controllers. Use Value: 15 ns access ensures sub-10 µs I/O update cycles at 85°C ambient, meeting IEC 61131-3 scan-time requirements. | Use Scenario: Serving as external data RAM for 8-bit/16-bit MCUs (e.g., Intel 80C51, Motorola 68HC11) in medical diagnostic equipment. IC Role / Device Role / Timing Role: Byte-wide parallel memory mapped at fixed address space; accessed via MOVX or similar instructions. Use Value: TTL compatibility and 5 V operation eliminate interface logic, reducing BOM count and layout complexity. |
| Motor Drive Control FIFO | Test Equipment Pattern Memory |
Use Scenario: Holding position command sequences and feedback history in servo drive digital signal processors. IC Role / Device Role / Timing Role: Dual-port accessible FIFO buffer synchronized between DSP core and PWM timer peripherals. Use Value: tOH = 3 ns and tOHZ ≤ 7 ns enable glitch-free handoff between read and write phases during high-frequency motion profiling. | Use Scenario: Storing stimulus/response vectors in automated test equipment for semiconductor wafer probing. IC Role / Device Role / Timing Role: High-reliability pattern store accessed at 66 MHz equivalent burst rate using CS/OE strobing. Use Value: Industrial temp rating and 40 mA ISB ensure stable vector replay across thermal cycling in production test chambers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY62128EV30LL-45ZSXI | 512K × 8-bit, 45 ns access, 3.3 V supply, SOIC-28 package | Higher density but slower speed and lower voltage; requires level-shifting for 5 V systems | Select only if migrating to 3.3 V architecture and needing >256 KByte capacity |
| AS6C4008-15TIN | 512K × 8-bit, 15 ns access, 5 V supply, TSOP-28 package | Same speed and voltage, but larger density and different package (TSOP vs SOJ); pinout incompatible | Consider for new designs where board space allows TSOP and higher density is needed |
Compared with CY62128EV30LL-45ZSXI and AS6C4008-15TIN, the 71256SA15YGI8 uniquely delivers 15 ns industrial-grade performance in a drop-in SOJ footprint for legacy 5 V systems-enabling direct replacement without PCB or voltage rail changes.
Availability
71256SA15YGI8 is available at Aetrix Electronics and suitable for industrial automation, motor control, and legacy microcontroller-based systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 71256SA15YGI8 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, and infrastructure markets.
The 71256SA15YGI8 belongs to Renesas' legacy high-speed CMOS SRAM product line, engineered specifically for robust, pin-compatible memory expansion in industrial control and instrumentation systems requiring zero-refresh operation and wide-temperature reliability.
FAQ
What is the operating temperature range specified for the 71256SA15YGI8?
The 71256SA15YGI8 is rated for industrial temperature operation from –40°C to +85°C. This specification is guaranteed across all AC and DC parameters in the datasheet, including access time (tAA ≤ 15 ns), standby current (ISB ≤ 40 mA), and I/O voltage thresholds. The "I" suffix in the part number explicitly denotes this industrial grade, and it is validated per Renesas' industrial qualification standards.
Does the 71256SA15YGI8 require a clock or refresh circuit?
No, the 71256SA15YGI8 uses fully static CMOS design and requires neither a clock nor periodic refresh. Data retention is maintained indefinitely as long as VCC remains within 4.5 V–5.5 V and temperature stays within –40°C to +85°C. This eliminates timing-critical refresh overhead in MCU- or FPGA-based systems and simplifies PCB layout by removing associated clock routing and refresh logic.
What package type and pin count does the 71256SA15YGI8 use?
71256SA15YGI8 uses a 28-pin 300-mil plastic SOJ (Small Outline J-lead) package, identified as PJG28 in Renesas' ordering nomenclature. It features gull-wing leads compatible with standard surface-mount reflow processes and matches the mechanical footprint of legacy 28-pin SOJ memories, enabling drop-in replacement on existing industrial PCBs.
How does the Output Enable (OE) pin function independently of Chip Select (CS) in the 71256SA15YGI8?
In the 71256SA15YGI8, OE provides independent control of output drivers while CS manages overall device selection and power state. When CS is active (LOW) and OE is toggled, outputs respond within tOE ≤ 7 ns-enabling fast read bursts without changing CS. When CS is HIGH, the device enters standby (ISB/ISB1), and OE has no effect. This separation supports multiplexed bus architectures where multiple devices share CS but use individual OE lines for arbitration.
Is the 71256SA15YGI8 compliant with RoHS and green manufacturing standards?
Yes, the 71256SA15YGI8 is a Renesas "Green" device, meaning it complies with RoHS Directive 2011/65/EU and is manufactured without lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), or polybrominated diphenyl ethers (PBDE). The "G" suffix in the ordering code confirms this compliance, and material declarations are available in Renesas' official environmental documentation.
71256SA15YGI8 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:
- 15ns
- Access Time:
- 15 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOJ
71256SA15YGI8 FAQ
1.How can I place an order for 71256SA15YGI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71256SA15YGI8 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 71256SA15YGI8 reliable?
The price and inventory of 71256SA15YGI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71256SA15YGI8 is usually 5 days.
3.What payment methods are accepted for 71256SA15YGI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71256SA15YGI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71256SA15YGI8?
71256SA15YGI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71256SA15YGI8 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 71256SA15YGI8?
For technical support, including 71256SA15YGI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71256SA15YGI8 requirements.
6.How does Aetrix verify that 71256SA15YGI8 is sourced from the original manufacturer or authorized distributors?
All 71256SA15YGI8 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 71256SA15YGI8 meets industry standards.
7.What is the process for return or replacement of 71256SA15YGI8?
All 71256SA15YGI8 units undergo pre-shipment inspection (PSI). If there is an issue with 71256SA15YGI8, 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 71256SA15YGI8 part is unused and in its original packaging.
Return procedure for 71256SA15YGI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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