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Renesas 71256L20YGI
- Part No.:
- 71256L20YGI
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-BSOJ (0.300", 7.62mm Width)
- Datasheet:
-
71256L20YGI.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOJ
- Quantity:
- Payment:
- Shipping:
Inventory:2,184
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Product details
Overview
71256L20YGI from Renesas Electronics is a 256K (32K × 8-bit) low-power CMOS static RAM with 20ns address access time, TTL-compatible I/O, and industrial temperature operation (–40°C to +85°C). It features battery backup data retention at 2V, 5μW standby power, and 28-pin 300-mil SOJ packaging - deployed in avionics control modules requiring nonvolatile SRAM persistence during main power loss.
For engineers reviewing the 71256L20YGI datasheet, 71256L20YGI pinout, 71256L20YGI application, or 71256L20YGI equivalent, key selection criteria include its 20ns read cycle timing, 2V data retention capability, industrial-grade reliability under thermal cycling, and SOJ package compatibility with legacy military/industrial PCB layouts.
Technical Context
The 71256L20YGI implements a full CMOS static memory array with asynchronous parallel interface logic, supporting independent chip select (CS), output enable (OE), and write enable (WE) controls. Its dual standby modes - TTL-level (ISB = 3mA) and CMOS-level (ISB1 = 1.5μA) - are triggered by CS high, enabling system-level power gating without external sequencing.
Timing behavior is defined by strict AC parameters: tAA ≤ 20ns, tRC ≤ 20ns, tCLZ ≤ 5ns, and tCHZ ≤ 10ns across –40°C to +85°C. Data retention at VCC = 2.0V is guaranteed with ICCDR ≤ 120μA, and all I/O pins meet TTL voltage thresholds (VIH ≥ 2.2V, VIL ≤ 0.8V) while drawing ≤5μA leakage current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (262,144 bits), byte-wide parallel interface |
| Access Time (tAA) | 20ns max - enables real-time data buffering in 50MHz bus systems |
| Supply Voltage | 5.0V ±10% - compatible with standard TTL/CMOS logic rails |
| Data Retention Voltage | 2.0V min - sustains memory state during brownout or backup battery operation |
| Standby Current (ISB1) | 1.5μA max at VCC = 5.5V - supports >10-year battery life in maintenance-free systems |
| Operating Temperature | –40°C to +85°C - qualified for industrial control, transportation, and test equipment |
| I/O Compatibility | TTL-input/outputs - direct interfacing with 74LS/74HC families without level shifters |
Pinout & Package
71256L20YGI is housed in a 28-pin 300-mil Small Outline J-Lead (SOJ) package (PJG28), optimized for high-density board mounting and thermal reliability in convection-cooled environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus accepting 0–32767 row/column decode |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel data path with high-impedance tri-state control via OE/CS |
| CS | Chip Select | Active-low enable; forces standby mode when high, eliminating external power management |
| WE | Write Enable | Active-low control for write cycles; latches data on falling edge with tWP ≥ 15ns |
| OE | Output Enable | Active-low control for read output drivers; decouples data bus during idle or write |
| VCC | Power Supply | +5V supply pin with 4.5–5.5V operating range and 1.0W absolute max dissipation |
| GND | Ground Reference | Signal and power return common to all I/O and internal circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Low-power standby (ISB1) | 1.5μA at VCC = 5.5V - reduces system quiescent current by >99% vs active mode |
| Battery backup retention | Operates down to 2.0V with ICCDR ≤ 120μA - enables coin-cell support for >5 years |
| TTL-compatible I/O | VIH ≥ 2.2V, VIL ≤ 0.8V, IOH/IOH compliant - eliminates level-shifter components |
| Industrial temperature grade | –40°C to +85°C operation with full AC/DC specs guaranteed - suitable for uncontrolled enclosures |
| SOJ package (PJG28) | 28-pin 300-mil J-lead - provides mechanical robustness and thermal performance superior to plastic DIP |
Applications
| Avionics Data Logging | Railway Signaling Controller |
|---|---|
|
Use Scenario: Nonvolatile storage of flight parameter snapshots during power interruption in black box recorders. IC Role / Device Role / Timing Role: Asynchronous SRAM buffer holding last 30 seconds of sensor data before safe shutdown. Use Value: 2V data retention ensures zero data loss during 100ms main power dropout; 20ns access enables capture at 50kHz sampling rates. |
Use Scenario: Real-time track occupancy status caching in wayside signaling units exposed to outdoor thermal extremes. IC Role / Device Role / Timing Role: Primary working memory for FPGA-based logic controllers managing signal interlocking states. Use Value: Industrial temperature rating (–40°C to +85°C) guarantees operation in rail-side cabinets without forced cooling; SOJ package resists vibration-induced solder fatigue. |
| Medical Diagnostic Imaging | Industrial PLC I/O Module |
|
Use Scenario: Temporary frame buffering in portable ultrasound devices where battery runtime and data integrity are critical. IC Role / Device Role / Timing Role: High-speed scratchpad memory for echo processing pipeline between ADC and DSP. Use Value: 20ns tAA allows pixel data transfer at 50MB/s burst rate; 5μW ISB1 extends battery life during standby between scans. |
Use Scenario: Configuration and state storage in modular programmable logic controllers used in factory automation. IC Role / Device Role / Timing Role: Fast-access memory for ladder logic execution stack and I/O mapping tables. Use Value: TTL compatibility enables direct connection to legacy 5V microcontrollers; 28-pin SOJ footprint matches existing PCB tooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY62256LN-20ZSXI | 256K × 8, 20ns, SOJ-28, but rated only to +70°C commercial temp | Lacks industrial temperature qualification and 2V data retention | Acceptable only in climate-controlled environments where backup retention is not required |
| IS61LV25616AL-20TQLI | 256K × 16, 20ns, TQFP-44, 3.3V core - requires level translation for 5V systems | Different data width, voltage domain, and package; no 2V retention mode | Only viable if redesigning for 3.3V architecture and wider bus; not drop-in |
Compared with CY62256LN-20ZSXI and IS61LV25616AL-20TQLI, the 71256L20YGI uniquely delivers industrial temperature operation, 2V battery backup retention, and native 5V TTL compatibility in a legacy SOJ footprint - making it irreplaceable in field-deployed systems requiring long-term data persistence without board rework.
Availability
71256L20YGI is available at Aetrix Electronics and suitable for avionics data logging, railway signaling controllers, medical diagnostic imaging, and industrial PLC I/O modules requiring stable component supply across extended product lifecycles.
Supply support for 71256L20YGI 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 71256L20YGI belongs to Renesas' legacy high-reliability SRAM product line, designed specifically for mission-critical industrial and transportation systems demanding extended temperature operation and battery-backed data integrity.
FAQ
What is the maximum operating temperature range for the 71256L20YGI?
The 71256L20YGI is specified for industrial temperature operation from –40°C to +85°C, with all DC and AC electrical characteristics fully guaranteed across this range. This makes it suitable for deployment in unheated outdoor cabinets, engine compartments, and factory-floor control panels where ambient temperatures exceed commercial-grade limits.
Does the 71256L20YGI support true battery backup operation below 5V?
Yes, the 71256L20YGI supports data retention at VCC = 2.0V minimum, consuming ≤120μA (typical 5μW) in full standby mode. This enables use with single-cell lithium or alkaline batteries for multi-year data persistence during main power failure - a capability not present in standard SRAMs.
Is the 71256L20YGI pin-compatible with other 28-pin SOJ SRAMs like the 62256 series?
The 71256L20YGI uses the industry-standard 28-pin SOJ pinout (PJG28) with identical A0–A14, I/O0–I/O7, CS, WE, OE, VCC, and GND assignments as the 62256 family. However, timing parameters and retention behavior differ - verify tAA, tRC, and ISB1 values before substitution.
What is the significance of the 'L' suffix in 71256L20YGI?
The 'L' denotes the low-power variant of the IDT/Renesas 71256 family, featuring reduced dynamic current (115mA typ.), ultra-low standby current (1.5μA), and integrated 2V data retention - distinguishing it from the standard-power 'S' version (e.g., 71256S20) which lacks battery backup capability.
Can the 71256L20YGI be used in new designs despite its legacy status?
Yes - although originally introduced by IDT and later rebranded by Renesas, the 71256L20YGI remains actively manufactured and supported for industrial and defense applications. Its proven reliability, SOJ package longevity, and unique 2V retention make it a strategic choice for long-lifecycle systems where obsolescence risk is managed via Aetrix's continuity programs.
71256L20YGI 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:
- 20ns
- Access Time:
- 20 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
71256L20YGI FAQ
1.How can I place an order for 71256L20YGI through Aetrix?
Please submit a Request for Quotation (RFQ) for 71256L20YGI 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 71256L20YGI reliable?
The price and inventory of 71256L20YGI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71256L20YGI is usually 5 days.
3.What payment methods are accepted for 71256L20YGI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71256L20YGI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71256L20YGI?
71256L20YGI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71256L20YGI 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 71256L20YGI?
For technical support, including 71256L20YGI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71256L20YGI requirements.
6.How does Aetrix verify that 71256L20YGI is sourced from the original manufacturer or authorized distributors?
All 71256L20YGI 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 71256L20YGI meets industry standards.
7.What is the process for return or replacement of 71256L20YGI?
All 71256L20YGI units undergo pre-shipment inspection (PSI). If there is an issue with 71256L20YGI, 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 71256L20YGI part is unused and in its original packaging.
Return procedure for 71256L20YGI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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