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Renesas 71256SA20YG8
- Part No.:
- 71256SA20YG8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-BSOJ (0.300", 7.62mm Width)
- Datasheet:
-
71256SA20YG8.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOJ
- Quantity:
- Payment:
- Shipping:
Inventory:2,929
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Product details
Overview
71256SA20YG8 from Renesas Electronics is a 32K × 8-bit (262,144-bit) high-speed CMOS static RAM operating at 5V, with 20 ns access time, industrial temperature range (–40°C to +85°C), TTL-compatible I/O, and single-chip-select architecture. It serves as main or buffer memory in real-time control systems requiring deterministic read/write timing without refresh.
For engineers reviewing the 71256SA20YG8 datasheet, 71256SA20YG8 pinout, 71256SA20YG8 application, or 71256SA20YG8 equivalent, key selection criteria include industrial-grade reliability, 20 ns tAA/tRC timing, SOJ-28 package compatibility, and low ISB1 standby current (15 mA) for power-sensitive embedded designs.
Technical Context
The 71256SA20YG8 implements fully static asynchronous operation-no clocks or refresh required-and uses dual-control logic with independent Chip Select (CS) and Output Enable (OE) pins to support interleaved read/write cycles and output tri-state management. Its bidirectional I/O lines are directly TTL-compatible, eliminating level-shifting circuitry.
It features two distinct standby modes: ISB (TTL-level CS deassertion, 40 mA max) and ISB1 (CMOS-level CS deassertion, 15 mA max), enabling dynamic power optimization based on system bus voltage thresholds. Address decoding is internal, supporting full 15-bit address space (A0–A14) for 32K word selection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32K × 8-bit (262,144 bits); supports byte-wide data buses without external multiplexing |
| Access Time (tAA) | 20 ns max; guarantees deterministic read latency under industrial temperature and voltage extremes |
| Cycle Time (tRC) | 20 ns max; enables 50 MHz sustained random-access throughput in burst-free operation |
| Supply Voltage | 4.5 V to 5.5 V; compatible with legacy 5V TTL/CMOS system rails without regulation overhead |
| Operating Temp | –40°C to +85°C; qualified for industrial automation, motor drives, and outdoor instrumentation |
| Standby Current (ISB1) | 15 mA max at VCC = 5.5 V; reduces idle power in battery-backed or energy-constrained applications |
| I/O Compatibility | TTL input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V); interfaces directly with 74LS, 74HC, and microcontroller GPIOs |
Pinout & Package
71256SA20YG8 is supplied in a 28-pin 300-mil Plastic SOJ (Small Outline J-Lead) package, designated PJG28 per Renesas ordering codes. Lead finish is lead-free (Green), compliant with RoHS directives.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit unidirectional address bus; selects one of 32,768 memory locations |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit TTL-compatible data path; direction controlled by WE and CS states |
| CS | Chip Select | Active-low enable; gates all internal operations; supports multi-chip memory expansion |
| WE | Write Enable | Active-low write control; latches data on falling edge when CS is active |
| OE | Output Enable | Active-low output control; enables data read without affecting write functionality |
| VCC | Power Supply | +5V supply pin; decoupling capacitor placement critical for noise immunity at 20 ns timing |
| GND | Ground | Reference return path; requires low-inductance connection to minimize ground bounce during I/O switching |
Key Features
| Feature | Design Value |
|---|---|
| Industrial Temperature Range | Rated for continuous operation from –40°C to +85°C, validated across voltage and timing margins |
| Low-Power Standby Mode (ISB1) | 15 mA max ICC in CMOS-level deselected state, enabling extended sleep in programmable logic controllers |
| Asynchronous Static Architecture | No clock, no refresh, no wait states-simplifies timing design in FPGA- or MCU-based memory subsystems |
| Direct TTL Compatibility | Input thresholds and output drive meet 74LS specifications, eliminating interface buffers in legacy 5V systems |
| SOJ-28 Package | 300-mil body width with J-leads; provides mechanical robustness and thermal performance suitable for reflow-soldered industrial PCBs |
Applications
| Programmable Logic Controller (PLC) Data Buffer | Digital Signal Acquisition Module |
|---|---|
Use Scenario: Storing real-time sensor samples and control register values between scan cycles in DIN-rail mounted PLCs. IC Role / Device Role / Timing Role: Asynchronous SRAM buffer interfacing directly with 8051 or ARM7-based controller buses via A0–A14, I/O0–I/O7, CS, OE, and WE. Use Value: 20 ns tAA ensures sub-microsecond register updates during 1 ms I/O scan intervals, while ISB1 mode cuts background power during idle periods. | Use Scenario: Capturing synchronized analog-to-digital conversion results in test equipment with multi-channel simultaneous sampling. IC Role / Device Role / Timing Role: High-speed temporary storage for 32K samples prior to DMA transfer to host processor; operates in burst-read mode using CS-controlled timing. Use Value: 20 ns tRC enables continuous 50 MHz read bursts, matching ADC output rates up to 20 MSPS with zero wait states. |
| Industrial HMI Display Frame Buffer | Motor Drive Position Lookup Table |
Use Scenario: Holding bitmap data for monochrome or grayscale LCD panels in factory-floor HMIs exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Byte-accessible frame buffer mapped into microcontroller memory space; accessed via parallel bus with OE-gated reads. Use Value: Industrial-grade temperature rating ensures stable pixel data retention at +85°C cabinet temperatures, avoiding display corruption. | Use Scenario: Storing precomputed sine/cosine or torque compensation tables used in field-oriented control (FOC) algorithms for servo drives. IC Role / Device Role / Timing Role: Read-only lookup table accessed during PWM interrupt service routines; timing-critical due to real-time loop constraints. Use Value: 20 ns tAA guarantees table reads complete within tight 1 µs ISR windows, preventing control loop jitter in 20 kHz motor switching applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AS6C4008-20TIN | Same 32K × 8 organization, 20 ns speed, but 28-pin TSOP-I (PZG28) package; lower ISB1 (5 mA) | Preferred where board space is constrained and reflow profile favors TSOP over SOJ | Select if footprint revision allows TSOP and ultra-low standby current is prioritized over mechanical ruggedness |
| IS61LV25616AL-20TI | 16-bit bus width (256K × 16), 20 ns, 44-pin TSOP-II; higher density, wider data path | Suitable for 16-bit microcontrollers or FPGAs needing reduced address cycles per transfer | Choose only when migrating to wider data bus architecture-requires PCB redesign and software alignment changes |
Compared with AS6C4008-20TIN and IS61LV25616AL-20TI, the 71256SA20YG8 offers proven SOJ-28 mechanical reliability in vibration-prone environments and direct drop-in compatibility with legacy 5V 8-bit controller designs, without requiring bus-width or layout changes.
Availability
71256SA20YG8 is available at Aetrix Electronics and suitable for industrial automation, motor control, and test instrumentation requiring stable component supply across extended product lifecycles and temperature extremes.
Supply support for 71256SA20YG8 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 IoT applications.
The IDT71256SA family-now part of Renesas' legacy high-reliability memory portfolio-was engineered specifically for deterministic, low-latency, refresh-free data storage in mission-critical industrial control and instrumentation systems.
FAQ
What is the maximum operating temperature specification for the 71256SA20YG8?
The 71256SA20YG8 is rated for industrial temperature operation from –40°C to +85°C. This specification is guaranteed across all electrical parameters including tAA (20 ns), ISB1 (15 mA max), and VIH/VIL thresholds. The device undergoes temperature cycling validation per JEDEC JESD22-A108, ensuring reliability in harsh environments such as factory-floor controllers and outdoor telemetry units.
Does the 71256SA20YG8 require an external clock or refresh circuitry?
No, the 71256SA20YG8 uses fully static CMOS design with no clocks or refresh cycles required. Its asynchronous architecture relies solely on address, CS, WE, and OE signal timing-enabling seamless integration with microcontrollers, FPGAs, and ASICs lacking dedicated memory controllers. All timing parameters (e.g., tRC = 20 ns) are valid under static DC conditions.
What package type and lead count does the 71256SA20YG8 use?
The 71256SA20YG8 uses a 28-pin 300-mil Plastic SOJ (Small Outline J-Lead) package, identified as PJG28 in Renesas documentation. It features gull-wing J-leads optimized for reflow soldering, RoHS-compliant lead-free finish, and mechanical dimensions conforming to JEDEC MO-080. Pin pitch is 1.27 mm, body width 7.62 mm.
How does the 71256SA20YG8 manage power in standby mode?
The 71256SA20YG8 supports two standby modes: ISB (TTL-level CS deassertion, 40 mA max) and ISB1 (CMOS-level CS deassertion, 15 mA max). ISB1 activates when CS rises above VHC (VCC – 0.2 V), reducing current by 62.5% versus ISB-critical for battery-buffered systems. Both modes retain full data without refresh.
Is the 71256SA20YG8 pin-compatible with other speed grades in the same package?
Yes, all 71256SA variants-including 71256SA12YG8, 71256SA15YG8, 71256SA20YG8, and 71256SA25YG8-share identical SOJ-28 (PJG28) pinout, voltage ratings, and functional logic. Speed grade differences affect only AC timing parameters (tAA, tRC, etc.), allowing hardware reuse across performance tiers during prototyping or cost optimization.
71256SA20YG8 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:
- 20ns
- Access Time:
- 20 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
71256SA20YG8 FAQ
1.How can I place an order for 71256SA20YG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71256SA20YG8 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 71256SA20YG8 reliable?
The price and inventory of 71256SA20YG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71256SA20YG8 is usually 5 days.
3.What payment methods are accepted for 71256SA20YG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71256SA20YG8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71256SA20YG8?
71256SA20YG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71256SA20YG8 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 71256SA20YG8?
For technical support, including 71256SA20YG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71256SA20YG8 requirements.
6.How does Aetrix verify that 71256SA20YG8 is sourced from the original manufacturer or authorized distributors?
All 71256SA20YG8 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 71256SA20YG8 meets industry standards.
7.What is the process for return or replacement of 71256SA20YG8?
All 71256SA20YG8 units undergo pre-shipment inspection (PSI). If there is an issue with 71256SA20YG8, 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 71256SA20YG8 part is unused and in its original packaging.
Return procedure for 71256SA20YG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71256SA20YG8 Tags
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