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Renesas 71256SA20YGI
- Part No.:
- 71256SA20YGI
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-BSOJ (0.300", 7.62mm Width)
- Datasheet:
-
71256SA20YGI.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOJ
- Quantity:
- Payment:
- Shipping:
Inventory:4,508
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Product details
Overview
71256SA20YGI from Renesas Electronics is a 32K × 8-bit (262,144-bit) high-speed CMOS static RAM with industrial temperature support (–40°C to +85°C), 20 ns access time, TTL-compatible I/O, and single 5 V supply operation. It features separate Chip Select (CS) and Output Enable (OE) pins, bidirectional data lines, and low-power standby modes - used in legacy industrial controllers, test equipment memory buffers, and embedded instrumentation requiring deterministic asynchronous read/write timing.
For engineers reviewing the 71256SA20YGI datasheet, 71256SA20YGI pinout, 71256SA20YGI application, or 71256SA20YGI equivalent, key selection criteria include verified 20 ns tAA/tRC timing at industrial temperature, SOJ-28 package compatibility, CS/OE dual-control architecture, and ISB1 standby current of 15 mA under CMOS-level deselect - critical for power-constrained edge nodes and long-life deployed systems.
Technical Context
The 71256SA20YGI implements fully static asynchronous logic with no clocks or refresh required. Its address decoder drives a 262,144-bit memory array using high-reliability CMOS process technology, supporting concurrent address setup (tAS = 0 ns) and output hold (tOH = 3 ns) for stable bus interfacing.
It uses TTL-compatible input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and delivers VOH ≥ 2.4 V / VOL ≤ 0.4 V at specified loads. Standby current splits into two modes: ISB = 40 mA (TTL-level CS deassertion) and ISB1 = 15 mA (CMOS-level CS deassertion), enabling design-level power-state optimization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (262,144-bit total); supports byte-wide parallel data transfers without multiplexing. |
| Access Time (tAA) | 20 ns max at VCC = 4.5–5.5 V and TA = –40°C to +85°C; guarantees deterministic read 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 (ISB1) | 15 mA max at VCC = 5.5 V, CMOS-level CS deassertion; enables ultra-low-power sleep mode in battery-backed systems. |
| I/O Compatibility | TTL-compatible inputs/outputs; interfaces directly with 74LS, 74F, and microcontroller GPIO without level-shifting. |
| Operating Temperature | –40°C to +85°C industrial grade; qualified for deployment in factory automation, transportation, and outdoor monitoring hardware. |
| Package | 28-pin 300-mil Plastic SOJ (PJG28); surface-mount compatible with legacy reflow profiles and manual repair accessibility. |
Pinout & Package
71256SA20YGI is housed in a 28-pin 300-mil Plastic SOJ (PJG28) package with gull-wing leads, designed for PCB surface-mount assembly and thermal reliability in industrial environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus (32K = 2¹⁵); latched on CS low transition; no internal multiplexing required. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit TTL-compatible data path; direction controlled by WE and OE; high-impedance when deselected or OE high. |
| CS | Chip Select | Active-low enable for device selection; controls ISB/ISB1 standby modes and initiates all access cycles. |
| OE | Output Enable | Active-low control for output drivers only; allows read data gating independent of CS during multi-chip memory banking. |
| WE | Write Enable | Active-low signal defining write cycle timing; overlaps with CS low to initiate data capture into memory array. |
| VCC | Power Supply | +5 V supply pin; decoupling recommended within 10 mm of pin per high-speed RAM layout guidelines. |
| GND | Ground Reference | Signal and power ground return; requires low-inductance connection to minimize noise coupling during fast transitions. |
Key Features
| Feature | Design Value |
|---|---|
| Fully static asynchronous operation | No clock, no refresh, no wait states - simplifies timing-critical controller designs and eliminates dynamic power overhead. |
| Dual standby current modes (ISB / ISB1) | Enables hierarchical power management: 40 mA (TTL CS) for fast wake-up vs. 15 mA (CMOS CS) for deep sleep in energy-sensitive applications. |
| Separate CS and OE pins | Supports interleaved read operations across multiple SRAMs and enables output masking without chip deselection - critical for bus arbitration. |
| TTL-compatible I/O with 5 V supply | Direct interface with legacy microcontrollers (e.g., 8051, Z80, Motorola 68K) and FPGA I/O banks without external level shifters or resistors. |
| Industrial temperature qualification | Guaranteed 20 ns timing and full functionality across –40°C to +85°C - validated for use in uncontrolled ambient environments. |
Applications
| Industrial PLC Memory Buffer | Automated Test Equipment (ATE) Data Capture |
|---|---|
|
Use Scenario: Storing real-time sensor logs and program state in programmable logic controllers operating in factory-floor cabinets with ambient swings from 0°C to 75°C. IC Role / Device Role / Timing Role: Asynchronous byte-wide scratchpad memory providing deterministic 20 ns read/write cycles synchronized to ladder logic scan intervals. Use Value: Eliminates DRAM refresh overhead and ensures consistent latency under thermal stress - improving control loop jitter below 1 µs. |
Use Scenario: Capturing high-speed digital waveform samples during board-level functional testing where burst data rates exceed 40 MB/s. IC Role / Device Role / Timing Role: High-speed parallel buffer between pattern generator and analysis engine, leveraging tCLZ = 4 ns and tOH = 3 ns for tight setup/hold margins. Use Value: Enables single-cycle data handoff without FIFO logic, reducing test system latency and simplifying timing closure on dense backplanes. |
| Medical Diagnostic Instrumentation | Ruggedized Handheld Data Logger |
|
Use Scenario: Temporary storage of acquired ECG/EEG frames prior to compression and wireless transmission in portable diagnostic devices certified to IEC 60601-1. IC Role / Device Role / Timing Role: Non-volatile-buffer-adjacent SRAM holding raw analog-to-digital conversion results before processing; operates reliably at 55°C internal chassis temperature. Use Value: Meets medical-grade reliability requirements with zero refresh-induced bit errors and ISB1 = 15 mA enabling >100-hour battery life in sleep mode. |
Use Scenario: Field-deployed environmental monitors logging temperature, humidity, and GPS coordinates across seasonal extremes in remote locations. IC Role / Device Role / Timing Role: Primary working memory for ARM Cortex-M4-based firmware, interfacing via GPIO-banged parallel bus with strict 20 ns timing compliance. Use Value: Industrial temp rating and SOJ package robustness prevent cold-start failures at –40°C and ensure solder joint integrity after repeated thermal cycling. |
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 |
|---|---|---|---|
| CY62128EV30LL-45ZSXIT | 32K × 8-bit, 45 ns access, 3.3 V supply, TSOP-28 package; lower speed but lower voltage and newer process. | Targets modern 3.3 V embedded systems; not drop-in compatible due to voltage and timing mismatch. | Select only if migrating to 3.3 V architecture and relaxing timing to ≥45 ns. |
| AS6C4008-20PIN | 512K × 8-bit, 20 ns access, 5 V supply, PDIP-28; higher density but larger package footprint and higher ICC (180 mA). | Suitable for space-tolerant upgrades where board area permits larger DIP and thermal budget allows higher active current. | Choose when memory expansion beyond 256 KByte is needed and SOJ-to-DIP adapter is acceptable. |
Compared with CY62128EV30LL-45ZSXIT and AS6C4008-20PIN, the 71256SA20YGI uniquely balances industrial temperature support, 5 V TTL compatibility, SOJ-28 form factor, and 20 ns performance - making it irreplaceable in legacy 5 V control systems where voltage, timing, and package constraints are fixed.
Availability
71256SA20YGI is available at Aetrix Electronics and suitable for industrial PLC memory buffers, automated test equipment data capture, medical diagnostic instrumentation, and ruggedized handheld data loggers requiring stable component supply across extended product lifecycles.
Supply support for 71256SA20YGI 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 is a global semiconductor leader delivering microcontrollers, analog, power, and memory solutions for automotive, industrial, and infrastructure markets.
The 71256SA20YGI belongs to Renesas' legacy high-speed CMOS SRAM product line, engineered for deterministic asynchronous operation in mission-critical industrial control and instrumentation where reliability, timing precision, and long-term supply stability are mandatory.
FAQ
What is the maximum operating temperature range for the 71256SA20YGI?
The 71256SA20YGI is rated for industrial temperature operation from –40°C to +85°C. This range is guaranteed across all specified AC and DC parameters including 20 ns access time, 15 mA ISB1 standby current, and TTL-compatible I/O thresholds - validated per Renesas qualification standards for extended deployment in uncontrolled environments.
Does the 71256SA20YGI require a clock or refresh circuit?
No, the 71256SA20YGI uses fully static asynchronous CMOS design and requires no clock signal or periodic refresh cycles. All operations are controlled solely by CS, OE, and WE timing - eliminating refresh overhead, reducing system complexity, and ensuring deterministic latency for real-time embedded applications using the 71256SA20YGI.
What package type does the 71256SA20YGI use, and is it RoHS-compliant?
The 71256SA20YGI uses a 28-pin 300-mil Plastic SOJ (PJG28) package. Per Renesas ordering information and datasheet revision history, it is a green (lead-free, RoHS-compliant) device - confirmed by "G" suffix in part number and "Green parts available" statement in the Features section of the 71256SA20YGI documentation.
How does the dual standby mode (ISB vs. ISB1) work on the 71256SA20YGI?
The 71256SA20YGI offers two standby current modes: ISB = 40 mA activates when CS rises above VIH (≥2.2 V), while ISB1 = 15 mA engages when CS rises above VHC (VCC – 0.2 V). This allows system designers to choose faster wake-up (ISB) or deeper power savings (ISB1) depending on host controller drive capability - a key feature distinguishing the 71256SA20YGI from basic SRAMs.
Can the 71256SA20YGI be used with a 3.3 V microcontroller interface?
No - the 71256SA20YGI is strictly a 5 V device with TTL-compatible thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and requires VCC = 4.5–5.5 V. Direct connection to 3.3 V logic risks violating input voltage limits and causing undefined behavior. Level translation or voltage translation is mandatory when interfacing the 71256SA20YGI with 3.3 V microcontrollers.
71256SA20YGI 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
71256SA20YGI FAQ
1.How can I place an order for 71256SA20YGI through Aetrix?
Please submit a Request for Quotation (RFQ) for 71256SA20YGI 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 71256SA20YGI reliable?
The price and inventory of 71256SA20YGI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71256SA20YGI is usually 5 days.
3.What payment methods are accepted for 71256SA20YGI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71256SA20YGI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71256SA20YGI?
71256SA20YGI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71256SA20YGI 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 71256SA20YGI?
For technical support, including 71256SA20YGI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71256SA20YGI requirements.
6.How does Aetrix verify that 71256SA20YGI is sourced from the original manufacturer or authorized distributors?
All 71256SA20YGI 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 71256SA20YGI meets industry standards.
7.What is the process for return or replacement of 71256SA20YGI?
All 71256SA20YGI units undergo pre-shipment inspection (PSI). If there is an issue with 71256SA20YGI, 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 71256SA20YGI part is unused and in its original packaging.
Return procedure for 71256SA20YGI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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