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Renesas 71256SA15YGI
- Part No.:
- 71256SA15YGI
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-BSOJ (0.300", 7.62mm Width)
- Datasheet:
-
71256SA15YGI.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOJ
- Quantity:
- Payment:
- Shipping:
Inventory:3,910
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Product details
Overview
71256SA15YGI 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 operation, and 28-pin 300-mil plastic SOJ (PJG28) package. It serves as main or cache memory in embedded controllers requiring deterministic, no-refresh asynchronous read/write.
For engineers reviewing the 71256SA15YGI datasheet, 71256SA15YGI pinout, 71256SA15YGI application, or 71256SA15YGI equivalent, key selection criteria include industrial-grade timing consistency, low standby current (ISB = 40 mA max), bidirectional TTL I/O compatibility, and SOJ package footprint for legacy board reuse.
Technical Context
The 71256SA15YGI implements fully static asynchronous circuitry-no clocks or refresh required-and uses dual-control enable logic with independent Chip Select (CS) and Output Enable (OE) pins to manage read/write cycles and output impedance states. Its architecture supports simultaneous address decoding and data bus control via dedicated A0–A14 address inputs and I/O0–I/O7 bidirectional data lines.
It operates across VCC = 4.5 V to 5.5 V with guaranteed DC input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and AC timing validated under industrial conditions: tAA = 15 ns, tRC = 15 ns, tOE = 7 ns, and tWHZ = 6 ns. Standby power is minimized via two low-current modes: ISB (TTL-level CS deassertion) and ISB1 (CMOS-level CS deassertion).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (262,144-bit total); enables byte-wide data transfers without external multiplexing |
| Access Time (tAA) | 15 ns max at VCC = 4.5–5.5 V, TA = –40°C to +85°C; ensures deterministic latency in real-time control loops |
| Supply Voltage | 4.5 V to 5.5 V; compatible with standard 5 V logic rails and tolerant of ±10% regulation variation |
| Standby Current (ISB) | 40 mA max at VCC = 5.5 V; reduces system power during idle states in battery-backed or energy-constrained designs |
| I/O Compatibility | TTL-level inputs/outputs; eliminates level-shifting requirements when interfacing with legacy microcontrollers or FPGAs |
| Operating Temperature | –40°C to +85°C; qualified for industrial automation, transportation, and outdoor equipment deployments |
| Package | 28-pin 300-mil plastic SOJ (PJG28); provides mechanical and thermal reliability with industry-standard footprint |
Pinout & Package
28-pin 300-mil plastic SOJ (PJG28) package with gull-wing leads, designed for wave soldering and surface-mount reflow compatibility. Pin 1 marked by notch or dot; lead finish is lead-free per RoHS/Green compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus supporting full 32K address space; all inputs are TTL-compatible with defined VIH/VIL thresholds |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel data path; tri-stated when CS or OE inactive; drives/receives TTL logic levels directly |
| CS | Chip Select Input | Active-low enable controlling device selection; determines standby mode (ISB/ISB1) based on voltage threshold |
| WE | Write Enable Input | Active-low signal initiating write cycle; controls data latching and memory cell update timing |
| OE | Output Enable Input | Active-low signal enabling output drivers; allows fast read access (tOE = 7 ns) independent of CS assertion |
| VCC | Power Supply | +5 V supply pin; decoupling capacitor placement near this pin is critical for noise immunity and timing stability |
| GND | Ground Reference | Common return path for all signals and power; requires low-impedance PCB connection to minimize ground bounce |
Key Features
| Feature | Design Value |
|---|---|
| Fully static asynchronous operation | No clock, no refresh, no wait states-simplifies timing design in microcontroller-based systems |
| Dual enable control (CS + OE) | Enables flexible bus arbitration: OE toggles outputs while CS remains asserted, reducing bus contention |
| Industrial-grade 15 ns timing | Guaranteed tAA/tRC = 15 ns over –40°C to +85°C-supports deterministic performance in harsh environments |
| Low-power standby modes | ISB = 40 mA (TTL-level deselect) and ISB1 = 15 mA (CMOS-level deselect) reduce idle power in always-on systems |
| Green/RoHS-compliant packaging | PJG28 SOJ package meets lead-free and hazardous substance restrictions for global market compliance |
Applications
| Industrial PLC Memory Buffer | Legacy Embedded Controller Cache |
|---|---|
Use Scenario: Storing real-time I/O status and program variables in programmable logic controllers deployed in factory-floor cabinets. IC Role / Device Role / Timing Role: Non-volatile buffer memory holding transient process data between scan cycles; accessed asynchronously by ARM7 or 8051-class MCUs. Use Value: 15 ns access time ensures sub-microsecond response to sensor interrupts; industrial temp rating prevents data loss during ambient spikes up to +85°C. | Use Scenario: Serving as fast scratchpad memory for legacy 16-bit microcontrollers in medical diagnostic instruments with long product lifecycles. IC Role / Device Role / Timing Role: Primary working RAM replacing older NMOS SRAMs; interfaces directly to address/data buses without glue logic. Use Value: TTL-compatible I/O and 5 V operation eliminate level shifters; PJG28 SOJ footprint matches existing PCB land patterns for drop-in replacement. |
| Ruggedized Communication Module | Avionics Data Logger |
Use Scenario: Holding packet buffers and protocol stack state in railway signaling gateways exposed to vibration and wide thermal swings. IC Role / Device Role / Timing Role: Dual-port accessible memory segment used for DMA transfers between UART/FlexRay peripherals and host processor. Use Value: Guaranteed tCHZ ≤ 7 ns and tOHZ ≤ 6 ns ensure clean bus release during high-speed packet bursts; SOJ package resists mechanical stress. | Use Scenario: Capturing flight parameter snapshots in black-box recorders where data integrity must survive extreme shock and extended storage. IC Role / Device Role / Timing Role: High-reliability volatile memory storing pre-triggered sensor streams before non-volatile write; powered by backup battery during main power loss. Use Value: Low ISB1 = 15 mA extends battery life during standby; industrial temp range validates operation after cold-soak and hot-soak testing per DO-160. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY62128EV30LL-45ZAXI | 32K × 8, 45 ns access, 3.3 V only, 28-pin TSOP | Requires voltage translation for 5 V systems; slower timing limits use in high-throughput buffering | Select only if migrating to 3.3 V architecture and timing budget allows ≥45 ns latency |
| AS6C4008-15ZIN | 32K × 8, 15 ns access, 5 V, 28-pin SOJ-but manufactured by Alliance Memory | Pinout and timing identical; RoHS-compliant but not Renesas-branded; shorter lifecycle visibility | Valid functional alternative for cost-sensitive industrial builds where Renesas sourcing is constrained |
Compared with 71256SA15YGI, CY62128EV30LL-45ZAXI trades speed and voltage compatibility for lower power, while AS6C4008-15ZIN offers identical timing and packaging with alternate supply chain risk profile-neither is pin-compatible without verification of SOJ lead pitch and marking orientation.
Availability
71256SA15YGI is available at Aetrix Electronics and suitable for industrial PLC memory buffers, legacy embedded controller caches, ruggedized communication modules, and avionics data loggers requiring stable component supply across extended product lifecycles.
Supply support for 71256SA15YGI 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 enterprise applications.
The IDT71256SA family-now rebranded under Renesas-was designed specifically for high-reliability, no-refresh static memory needs in legacy and long-lifecycle embedded systems operating at 5 V.
FAQ
What is the maximum operating temperature range for the 71256SA15YGI?
The 71256SA15YGI 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 tAA = 15 ns, ISB = 40 mA max, and VIH/VIL thresholds. The device undergoes temperature cycling validation per JEDEC JESD22-A108, making it suitable for deployment in uncontrolled ambient environments such as factory floors or vehicle engine compartments.
Does the 71256SA15YGI require a clock or refresh signal to retain data?
No, the 71256SA15YGI uses fully static CMOS memory cells and requires no clock, refresh, or periodic access to retain data. As long as VCC remains within 4.5 V to 5.5 V and temperature stays within –40°C to +85°C, data persists indefinitely in standby mode. This eliminates timing-critical refresh overhead in MCU firmware and simplifies system-level power management for the 71256SA15YGI.
Can the 71256SA15YGI be used with a 3.3 V microcontroller interface?
The 71256SA15YGI is specified for 5 V operation only (VCC = 4.5–5.5 V) and features TTL-compatible I/O thresholds-not 3.3 V LVTTL. Direct connection to 3.3 V logic risks violating VIH min (2.2 V) and VIL max (0.8 V) margins under worst-case conditions. For mixed-voltage systems, the 71256SA15YGI requires level-shifting circuitry or a 5 V-tolerant I/O buffer to ensure reliable operation.
What is the pinout compatibility between 71256SA15YGI and earlier IDT-branded versions?
The 71256SA15YGI retains identical pinout, timing, and electrical specifications as the original IDT71256SA15YGI-Renesas rebranded the part without functional change. The PJG28 SOJ package, A0–A14 address mapping, I/O0–I/O7 data bus, and CS/OE/WE control pin assignments are 100% consistent. Board-level drop-in replacement is supported provided the PCB land pattern matches the 300-mil SOJ footprint.
Is the 71256SA15YGI compliant with RoHS and green manufacturing standards?
Yes, the 71256SA15YGI is a Green/RoHS-compliant device per Renesas' ordering information. It contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits. The "Y" in the part number denotes green packaging, and the PJG28 SOJ package uses matte tin lead finish. Compliance documentation-including test reports and declarations-is available through Renesas' quality portal for the 71256SA15YGI.
71256SA15YGI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-BSOJ (0.300", 7.62mm Width)
- Packaging:
- Tube
- 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
71256SA15YGI FAQ
1.How can I place an order for 71256SA15YGI through Aetrix?
Please submit a Request for Quotation (RFQ) for 71256SA15YGI 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 71256SA15YGI reliable?
The price and inventory of 71256SA15YGI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71256SA15YGI is usually 5 days.
3.What payment methods are accepted for 71256SA15YGI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71256SA15YGI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71256SA15YGI?
71256SA15YGI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71256SA15YGI 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 71256SA15YGI?
For technical support, including 71256SA15YGI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71256SA15YGI requirements.
6.How does Aetrix verify that 71256SA15YGI is sourced from the original manufacturer or authorized distributors?
All 71256SA15YGI 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 71256SA15YGI meets industry standards.
7.What is the process for return or replacement of 71256SA15YGI?
All 71256SA15YGI units undergo pre-shipment inspection (PSI). If there is an issue with 71256SA15YGI, 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 71256SA15YGI part is unused and in its original packaging.
Return procedure for 71256SA15YGI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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