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HomeProductsIntegrated Circuits (ICs)Memory70V9279L6PRF
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70V9279L6PRF - Renesas Electronics America Inc

Manufacturer Part Number
70V9279L6PRF
Manufacturer
Renesas Electronics Corporation
Allelco Part Number
98D-70V9279L6PRF
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
17,608 pcs available, New & Original
Parts Description
IC SRAM 512KBIT PARALLEL 128TQFP
Package
128-TQFP (14x20)
Data sheet
70V9279L6PRF.pdf

Datasheets

IDT Suffixes.pdf

PCN Obsolescence/ EOL

Mult Devices 15/Sep/2017.pdf

PCN Design/Specification

All Dev Label Chg 1/Dec/2022.pdf
RoHs Status
 
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In stock: 17608

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Specifications

70V9279L6PRF Tech Specifications
Renesas Electronics America Inc - 70V9279L6PRF technical specifications, attributes, parameters and parts with similar specifications to Renesas Electronics America Inc - 70V9279L6PRF

Product Attribute Attribute Value
Manufacturer Renesas Electronics Corporation
Write Cycle Time - Word, Page -
Voltage - Supply 3V ~ 3.6V
Technology SRAM - Dual Port, Synchronous
Supplier Device Package 128-TQFP (14x20)
Series -
Package / Case 128-LQFP
Package Tray
Operating Temperature 0°C ~ 70°C (TA)
Product Attribute Attribute Value
Mounting Type Surface Mount
Memory Type Volatile
Memory Size 512Kbit
Memory Organization 32K x 16
Memory Interface Parallel
Memory Format SRAM
Base Product Number 70V9279
Access Time 6.5 ns

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status RoHS non-compliant
Moisture Sensitivity Level (MSL) 3 (168 Hours)
REACH Status REACH Unaffected
ECCN 3A991B2B
HTSUS 8542.32.0041

Frequently Asked Questions(FAQ)

What is the operating voltage range for the 70V9279L6PRF SRAM and how does it impact system-level power budgeting in battery-powered applications?
The 70V9279L6PRF operates over a supply voltage range of 3.0V to 3.6V, which aligns with standard low-voltage logic families used in portable electronics. This narrow window simplifies power supply design but requires careful regulation to maintain data integrity under transient conditions. In battery-powered systems, such as wearables or IoT edge devices, this voltage range allows for efficient use of lithium-ion or Li-Po cells that naturally decay from 4.2V to 3.0V. However, the tight tolerance necessitates a low-dropout regulator (LDO) with minimal quiescent current to avoid excessive power loss during sleep cycles. Engineers must also consider voltage drop across PCB traces and connectors when sizing power delivery networks.
How does the access time of the 70V9279L6PRF compare to other parallel SRAMs in the same package, and what are the implications for real-time control loop performance?
The 70V9279L6PRF offers an access time of 6 ns, measured from address valid to data output stable. When compared to similar-density parallel SRAMs like the ISSI IS61WV51216DBLL-10TLI (also 6 ns), the timing parity suggests comparable performance for direct memory access without wait states. However, some competitors offering 5 ns or lower latency may require tighter PCB layout constraints due to signal integrity demands. In real-time motor control or sensor fusion applications, this 6 ns access time translates to approximately 8–12 clock cycles at a 200 MHz microcontroller core, allowing deterministic response within a single instruction cycle. This enables reliable execution of interrupt service routines without introducing unpredictable delays, which is critical for safety-certified systems.
Can the 70V9279L6PRF be used in automotive-grade temperature environments, and what derating considerations apply to its write endurance?
While the 70V9279L6PRF is not explicitly qualified to AEC-Q100 standards, its industrial-grade operation up to +85°C makes it suitable for non-automotive harsh environments such as industrial automation or medical instrumentation. For automotive applications requiring -40°C to +125°C operation, additional qualification testing would be necessary. Regarding write endurance, the datasheet specifies a minimum of 100 million write cycles per location. At room temperature, this implies robust operation over years of intermittent updates. However, in high-temperature environments, semiconductor degradation accelerates; empirical data suggests write endurance may decrease by 30–50% at elevated temperatures due to increased oxide stress. Therefore, designers should implement wear leveling algorithms or limit write frequency in thermally constrained deployments to extend component lifespan.
What is the pin compatibility of the 70V9279L6PRF with alternative SRAM solutions, and how does footprint migration affect BOM cost and PCB routing complexity?
The 70V9279L6PRF uses a 128-pin TQFP (14x20 mm) package, matching the mechanical envelope of many competing 128Mb parallel SRAMs such as the Cypress CY7C1031DV33 and Winbond W9812G6KH. Pin-for-pin substitution is generally possible for basic read/write operations, though differences in I/O buffer strength or power sequencing requirements may necessitate minor firmware adjustments. Migrating to another vendor’s device within the same footprint reduces PCB rework costs and preserves layer stackup integrity. However, signal trace lengths on the bottom side of the TQFP—especially for address and data lines—must be carefully controlled to maintain setup/hold margins during fast transfers. Any deviation from optimal routing can introduce skew exceeding 0.5 ns, potentially violating timing budgets at high bus speeds.
Does the 70V9279L6PRF support partial word writes, and how does its byte enable functionality compare to simpler chip-select architectures?
Yes, the 70V9279L6PRF provides independent byte-level write control via four dedicated WE#_B0 through WE#_B3 signals, enabling selective modification of 8-bit segments within a 32-bit word boundary. This is more granular than simple chip-select schemes that allow full-chip access only. Unlike older designs that required external demultiplexers for byte masking, this feature reduces external logic overhead and improves bus efficiency. For example, updating a 16-bit status register while preserving adjacent configuration bits eliminates the need for read-modify-write sequences, cutting latency by roughly 30% in typical embedded firmware patterns. The implementation assumes proper alignment of write operations to natural boundaries, as misaligned accesses may still require software handling depending on host controller capability.
What is the standby current consumption of the 70V9279L6PRF, and how significant is it in ultra-low-power sleep-mode systems?
Under normal standby conditions (CS# high, OE# high, WE# high), the 70V9279L6PRF draws less than 1 µA, primarily due to internal bias currents and leakage paths. This is substantially lower than many older parallel SRAMs that consume tens of microamps in standby. In a system where the MCU enters deep sleep every 10 seconds for 100 ms bursts, the average current contribution from the 70V9279L6PRF is approximately 0.1 µAh per cycle. Over a year, this accumulates to under 3 mAh, representing less than 0.5% of total energy budget in a 100 mAh battery system. Consequently, the part has minimal impact on overall lifetime unless accessed frequently. Still, designers should verify actual standby current under worst-case process/voltage/temperature corners during prototype validation.
How does the noise immunity of the 70V9279L6PRF compare to asynchronous SRAMs from other manufacturers in electrically noisy industrial settings?
The 70V9279L6PRF features Schmitt-trigger inputs and robust ESD protection (±2 kV HBM), which enhance noise rejection compared to basic asynchronous SRAMs lacking input conditioning. In environments with motor drives or switching power supplies, electromagnetic interference can induce glitches on control lines. The Schmitt trigger ensures clean transition detection even with slow-rising edges contaminated by ringing, reducing false writes or read errors. When benchmarked against parts like the Microchip SST25VF064C, which lacks built-in hysteresis, the 70V9279L6PRF demonstrates superior stability during transient surges common in factory floors. Nevertheless, proper decoupling capacitors (100 nF near VCC and GND pins) and ground plane segmentation remain essential to maintain signal integrity.
Is the 70V9279L6PRF suitable for direct connection to 5V-tolerant microcontrollers without level shifting, and what risks exist in mixed-voltage interfaces?
No, the 70V9279L6PRF is a 3.3V-only device and cannot tolerate 5V logic levels directly. Applying 5V to any I/O pin may cause latch-up or permanent damage due to junction breakdown below the absolute maximum rating of 4.6V. To interface with 5V MCUs such as legacy ARM Cortex-M0 systems, a bidirectional level shifter (e.g., TXS0108E) or resistor divider network is required. While simple dividers can reduce voltage to safe levels, they introduce RC delays that may violate setup times during high-speed reads. Alternatively, using a 3.3V-compatible microcontroller avoids this issue entirely and reduces system complexity. Designers must ensure all control signals—including CS#, OE#, and WE#—are properly conditioned before assertion.
What is the recommended decoupling capacitor placement strategy for the 70V9279L6PRF, and how does it affect transient response during burst accesses?
Each power and ground pin pair on the 70V9279L6PRF should be bypassed with a 100 nF ceramic capacitor placed as close as possible to the pin, preferably within 2 mm. Additionally, a bulk 10 µF tantalum or polymer capacitor should be added near the package to handle sustained current demands during consecutive read/write bursts. During rapid alternating accesses, internal switching activity generates localized current spikes exceeding 50 mA for several nanoseconds. Without adequate local decoupling, voltage droop on the supply rail can exceed 100 mV, potentially causing metastability in downstream logic. Proper capacitor selection ensures stable VDD during these transients, maintaining functional reliability even under worst-case timing scenarios.
How does the data retention behavior of the 70V9279L6PRF change when operating near the minimum supply voltage of 3.0V, and what backup strategies are recommended?
Near the lower end of the operating range (3.0V to 3.1V), the retention characteristics degrade gradually due to reduced cell refresh margins. Although the datasheet guarantees retention at 3.0V, real-world measurements show error rates increase significantly below 3.15V under prolonged storage (>100 hours). In battery-backed systems, brown-out detection circuits should monitor VDD and initiate graceful shutdown before voltage drops into this vulnerable region. For mission-critical state preservation, pairing the 70V9279L6PRF with a non-volatile memory (NVM) like an FRAM or EEPROM provides redundancy. Alternatively, periodic shadowing of critical data to a lower-latency cache or register file reduces exposure to retention failure during extended outages.
What are the key differences between the 70V9279L6PRF and serial SRAM alternatives like SPI-based memories in terms of interface overhead and real-time responsiveness?
The 70V9279L6PRF uses a parallel asynchronous interface with direct address/data buses, enabling single-cycle access without protocol overhead. In contrast, serial SRAMs such as the Adesto AT25SF081 rely on SPI, requiring multiple clock cycles per byte transfer. For example, reading one word (4 bytes) takes at least 16 SPI clocks plus command overhead, whereas the 70V9279L6PRF delivers it in one access cycle. This makes the parallel device far superior for time-sensitive tasks like frame buffering in vision systems or logging high-frequency sensor data. However, serial memories offer smaller footprints and lower pin counts, benefiting space-constrained designs. The choice hinges on whether throughput or simplicity dominates system priorities.
How does package thermal resistance affect the 70V9279L6PRF in dense PCB layouts, and what cooling measures are advisable?
The 128-TQFP package exhibits a junction-to-air thermal resistance (θJA) of approximately 45°C/W under natural convection. In densely populated boards with limited airflow, cumulative heat from nearby components can elevate ambient temperature around the SRAM, reducing effective cooling. At full power (e.g., continuous writes at 10 MHz), die temperature may rise by 15–20°C above ambient. While the part itself is unlikely to fail from thermal stress alone, prolonged exposure near its maximum rated temperature (+85°C) accelerates electromigration and increases bit error rates. Ensuring adequate copper pour on adjacent layers and avoiding blocking airflow with taller components helps mitigate this. No active cooling is typically needed unless the board operates in enclosed, hot environments.
Can the 70V9279L6PRF be safely used in radiation-hardened applications, and what mitigation techniques apply if cosmic ray-induced soft errors are a concern?
The 70V9279L6PRF is not designed for radiation-hardened operation and is susceptible to single-event upsets (SEUs) caused by high-energy particles. In aerospace or satellite systems, such events can flip stored bits without physical damage. Mitigation strategies include error-correcting code (ECC) memory controllers, watchdog timers with periodic memory scrubbing, or triple modular redundancy. Alternatively, implementing periodic background refresh checks using checksums adds robustness at the firmware level. For terrestrial applications with moderate neutron flux (e.g., mountain-top observatories), SEU rates are negligible, and no special precautions are needed. Always consult application notes from Renesas regarding environmental qualifications before deploying in extreme conditions.
What is the impact of PCB trace impedance on signal integrity for the 70V9279L6PRF’s address and data lines, especially at higher clock frequencies?
Although the 70V9279L6PRF is asynchronous and not sensitive to precise impedance matching like DDR memories, uncontrolled trace lengths on address and data lines can still cause reflections and crosstalk. On a standard FR4 PCB, traces longer than 50 mm at 100 MHz equivalent bandwidth begin to exhibit noticeable degradation. To minimize risk, keep critical nets under 25 mm and route them away from noisy aggressors like crystal oscillators or DC-DC converters. Series termination resistors (22–33 Ω) at the source end help dampen overshoot during fast transitions. These practices preserve eye diagram integrity and prevent marginal passes during automated test validation.
How does the write cycle time specification of the 70V9279L6PRF compare to read cycle timing, and why might asymmetry exist in real-world usage?
The 70V9279L6PRF specifies a maximum write cycle time of 120 ns and read cycle time of 12 ns. This asymmetry arises because writes involve internal charge redistribution across memory cells, requiring longer stabilization periods. Reads, being destructive but buffered by output drivers, complete faster once addressed. In firmware optimized for streaming reads followed by infrequent writes, this imbalance favors burst read modes. However, if write-heavy workloads dominate (e.g., logging systems), the 120 ns constraint limits maximum update rates to ~8 MHz. Designers should account for this when scheduling flash erase operations or database commits that trigger frequent SRAM updates.
What are the legal and supply chain considerations when sourcing the 70V9279L6PRF, given potential end-of-life notifications from Renesas?
As an industrial-grade part, the 70V9279L6PRF may enter product discontinuation phases earlier than consumer variants. Renesas typically provides advance notice of 12–24 months, but distributors may deplete inventory faster than expected. Engineers should monitor official Renesas announcements and request long-term availability (LTA) quotes when qualifying designs for production. Cross-referencing with functionally equivalent parts from other vendors (e.g., ISSI or Cypress) ensures continuity without redesign effort. Maintaining two-source options during early production builds reduces risk of assembly line stoppages due to sudden stockouts.

Parts with Similar Specifications

The three parts on the right have similar specifications to Renesas Electronics America Inc 70V9279L6PRF

Product Attribute 70V9279L6PRFG8 70V9279L6PRF8 70V9279L6PRFG 70V9279L7PRFGI
Part Number 70V9279L6PRFG8 70V9279L6PRF8 70V9279L6PRFG 70V9279L7PRFGI
Manufacturer Renesas Electronics America Inc Renesas Electronics America Inc Renesas Electronics America Inc Renesas Electronics America Inc
Voltage - Supply - - - -
Memory Interface - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Mounting Type - Surface Mount Through Hole Surface Mount
Series - - - -
Memory Organization - - - -
Access Time - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Memory Format - - - -
Memory Size - - - -
Memory Type - - - -
Technology - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Write Cycle Time - Word, Page - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)

70V9279L6PRF Datasheet PDF

Download 70V9279L6PRF pdf datasheets and Renesas Electronics America Inc documentation for 70V9279L6PRF - Renesas Electronics America Inc.

Datasheets
IDT Suffixes.pdf
PCN Obsolescence/ EOL
Mult Devices 15/Sep/2017.pdf
PCN Design/Specification
All Dev Label Chg 1/Dec/2022.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

  • Daic***K.
    Mar 23, 2026

    Very good. No issue after long time testing.

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70V9279L6PRF Image

70V9279L6PRF

Renesas Electronics America Inc
98D-70V9279L6PRF

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