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Renesas 71256SA20YG
- Part No.:
- 71256SA20YG
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-BSOJ (0.300", 7.62mm Width)
- Datasheet:
-
71256SA20YG.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOJ
- Quantity:
- Payment:
- Shipping:
Inventory:1,241
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Product details
Overview
71256SA20YG from Renesas Electronics is a 32K × 8-bit (256 Kbit) high-speed CMOS static RAM with industrial-grade temperature range (–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 bus, and low-power standby modes (ISB = 40 mA, ISB1 = 15 mA). Used in real-time control buffers, legacy industrial PLCs, and embedded instrumentation requiring deterministic asynchronous memory access.
For engineers reviewing the 71256SA20YG datasheet, 71256SA20YG pinout, 71256SA20YG application, or 71256SA20YG equivalent, key selection criteria include verified 20 ns read/write timing under industrial temperature, SOJ-28 package compatibility, CS/OE dual-control architecture, and CMOS-level standby current (ISB1 = 15 mA) for power-sensitive systems.
Technical Context
The 71256SA20YG implements fully static asynchronous logic-no clocks or refresh required-with independent address decoding and I/O control circuitry. Its dual-enable architecture (CS + OE) enables precise output gating during multi-chip memory configurations and supports high-impedance bus sharing without external transceivers.
It operates across VCC = 4.5 V to 5.5 V with TTL-compatible input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and guarantees tAA = 20 ns, tRC = 20 ns, tWC = 20 ns, and tOE = 10 ns at TA = –40°C to +85°C. Standby current drops to ISB1 = 15 mA when CS is held above VHC (VCC – 0.2 V), enabling deep-sleep power management in battery-backed systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8-bit (262,144-bit total); supports byte-wide parallel data interface without width expansion logic |
| Access Time (tAA) | 20 ns max at –40°C to +85°C; ensures deterministic read latency in hard 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 |
| I/O Compatibility | TTL-compatible inputs/outputs; interfaces directly with 74LS, 74F, and microcontroller GPIO without level shifters |
| Standby Current (ISB1) | 15 mA max at VCC = 5.5 V and f = 0; enables ultra-low-power hold mode when CS > VHC |
| Operating Temperature | –40°C to +85°C; qualified for industrial automation, transportation, and outdoor embedded environments |
| Package | 28-pin 300-mil Plastic SOJ (PJG28); surface-mount compatible with standard reflow profiles and IPC-7351B footprint |
Pinout & Package
71256SA20YG is housed in a 28-pin 300-mil Plastic SOJ (PJG28) package with gull-wing leads, JEDEC MS-013 compliant, body width 7.62 mm, lead pitch 1.27 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus; selects one of 32,768 memory locations (2¹⁵ = 32K) |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit TTL-compatible data path; direction controlled by WE and CS states |
| CS | Chip Select Input | Active-low enable; device enters standby (high-Z I/O) when high; controls ISB/ISB1 current modes |
| WE | Write Enable Input | Active-low write strobe; latches data on falling edge when CS is low |
| OE | Output Enable Input | Active-low output gate; enables data read without deselecting chip (CS remains low) |
| VCC | Power Supply | +5 V supply pin; must be decoupled locally per high-speed SRAM layout guidelines |
| GND | Ground Reference | Signal and power ground; requires low-inductance connection to minimize noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Dual-enable control (CS + OE) | Enables selective output gating while maintaining chip selection-critical for shared-bus arbitration in multi-SRAM systems |
| CMOS-level standby (ISB1) | Reduces current to 15 mA when CS > VHC, supporting low-power sleep modes without external power switches |
| 20 ns industrial-grade timing | Guaranteed tAA/tRC/tWC = 20 ns across –40°C to +85°C-enables reliable operation in uncontrolled thermal environments |
| TTL-compatible I/O | Eliminates need for level translators when interfacing with legacy 5 V microcontrollers, FPGAs, or ASICs |
| SOJ-28 packaging | Provides robust mechanical retention and thermal performance for industrial PCBs subject to vibration and thermal cycling |
Applications
| Industrial PLC Data Buffers | Legacy Medical Instrumentation |
|---|---|
Use Scenario: Storing real-time sensor acquisition buffers and control command queues in programmable logic controllers deployed in factory-floor cabinets. IC Role / Device Role / Timing Role: Asynchronous byte-wide SRAM providing zero-wait-state memory for microcontroller DMA transfers and interrupt service routines. Use Value: 20 ns access time ensures sub-microsecond response to fieldbus interrupts; industrial temp rating prevents data loss during ambient swings from 0°C to 65°C inside enclosures. | Use Scenario: Holding calibration tables and waveform history in portable ECG monitors and infusion pump controllers with long product lifecycles. IC Role / Device Role / Timing Role: Non-refresh volatile memory for fast lookup tables and temporary result storage between analog front-end sampling and host MCU processing. Use Value: SOJ-28 package withstands repeated rework cycles; ISB1 = 15 mA extends battery life during standby without compromising wake-up latency. |
| Ruggedized Test Equipment | Avionics Maintenance Tools |
Use Scenario: Capturing transient voltage/current waveforms in handheld oscilloscope modules used in aerospace ground support equipment. IC Role / Device Role / Timing Role: High-speed buffer memory capturing ADC samples at up to 50 MHz effective rate via burst-mode addressing. Use Value: tCLZ = 4 ns and tOH = 3 ns ensure clean data capture windows; guaranteed operation at –40°C allows use in hangar environments during winter operations. | Use Scenario: Supporting diagnostic firmware execution and fault log storage in portable avionics line-replaceable units (LRUs) certified to DO-160 Section 22. IC Role / Device Role / Timing Role: Code/data SRAM for 8051- or ARM7-based diagnostic processors requiring deterministic memory access under EMI stress. Use Value: PJG28 SOJ package passes vibration testing up to 20 g; green (RoHS-compliant) variant satisfies aviation environmental compliance requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar static RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY62256ELL-70SNXC | 70 ns access time, 32K × 8, SOJ-28, commercial temp only (0°C to +70°C) | Limited to benign environments; lacks industrial temp qualification and 20 ns speed | Select only for cost-sensitive non-industrial designs where timing slack exceeds 50 ns |
| AS6C4008-20TIN | 20 ns access, 512K × 8, TSSOP-32, industrial temp, but higher density and different pinout | Requires PCB redesign due to 32-pin TSSOP and incompatible address/data mapping | Choose only when memory capacity upgrade to 4 Mbit is acceptable and board space permits larger package |
Compared with CY62256ELL-70SNXC and AS6C4008-20TIN, the 71256SA20YG uniquely delivers 20 ns industrial-grade performance in the legacy-compatible SOJ-28 footprint-enabling drop-in replacement in existing 256 Kbit SRAM designs without layout or timing margin compromise.
Availability
71256SA20YG is available at Aetrix Electronics and suitable for industrial PLCs, legacy medical devices, ruggedized test equipment, and avionics maintenance tools requiring stable component supply across extended product lifecycles.
Supply support for 71256SA20YG 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 trusted embedded solutions for automotive, industrial, infrastructure, and IoT applications, with over 40 years of memory design heritage.
The IDT71256SA family-now part of Renesas' legacy high-speed SRAM portfolio-was engineered specifically for deterministic, low-latency, asynchronous memory access in mission-critical industrial and instrumentation systems.
FAQ
What is the operating temperature range specified for the 71256SA20YG?
The 71256SA20YG is rated for industrial temperature operation from –40°C to +85°C. This is explicitly confirmed in the "Features" section and "Recommended Operating Temperature and Supply Voltage" table of the Renesas datasheet (Rev. Jun.29.20), and applies to all speed grades including the 20 ns variant. The part is not qualified for extended or military temperature ranges.
Does the 71256SA20YG require a refresh circuit or clock signal?
No, the 71256SA20YG is a fully static RAM and requires no refresh circuitry or clock signal. Its internal circuitry is entirely asynchronous and operates deterministically using only address, CS, WE, and OE control signals. This eliminates timing overhead and simplifies integration with microcontrollers lacking dedicated DRAM controllers.
What is the meaning of ISB1 = 15 mA in the 71256SA20YG datasheet?
ISB1 = 15 mA is the maximum standby current drawn by the 71256SA20YG when Chip Select (CS) is held above the CMOS high threshold (VHC = VCC – 0.2 V), outputs are in high-impedance, and no address or data lines are switching. This ultra-low-power mode is distinct from TTL-level standby (ISB = 40 mA) and is critical for battery-backed or energy-harvesting applications.
Which package type does the 71256SA20YG use, and is it RoHS-compliant?
The 71256SA20YG uses the 28-pin 300-mil Plastic SOJ package (package code PJG28). Per the "Ordering Information" section and "Green parts available" note in the Renesas datasheet, this part is offered as a green (lead-free, RoHS-compliant) device, satisfying environmental compliance requirements for industrial and medical equipment.
Can the 71256SA20YG be used with a 3.3 V microcontroller interface?
No-the 71256SA20YG is strictly a 5 V device with TTL-compatible I/O thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and VCC = 4.5–5.5 V requirement. Direct connection to 3.3 V logic risks violating input voltage limits and may cause unreliable operation. A level-shifting solution (e.g., TXB0108 or discrete MOSFET translator) is required for interoperability with 3.3 V systems.
71256SA20YG 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOJ
71256SA20YG FAQ
1.How can I place an order for 71256SA20YG through Aetrix?
Please submit a Request for Quotation (RFQ) for 71256SA20YG 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 71256SA20YG reliable?
The price and inventory of 71256SA20YG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71256SA20YG is usually 5 days.
3.What payment methods are accepted for 71256SA20YG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71256SA20YG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71256SA20YG?
71256SA20YG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71256SA20YG 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 71256SA20YG?
For technical support, including 71256SA20YG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71256SA20YG requirements.
6.How does Aetrix verify that 71256SA20YG is sourced from the original manufacturer or authorized distributors?
All 71256SA20YG 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 71256SA20YG meets industry standards.
7.What is the process for return or replacement of 71256SA20YG?
All 71256SA20YG units undergo pre-shipment inspection (PSI). If there is an issue with 71256SA20YG, 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 71256SA20YG part is unused and in its original packaging.
Return procedure for 71256SA20YG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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