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Renesas 71V321L25JG8

Name: 71V321L25JG8
Brand: Renesas
SKU: 71V321L25JG8
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 71V321L25JG8

Manufacturer:: Renesas

Category:: Memory

Package:: 52-LCC (J-Lead)

Datasheet:: 71V321L25JG8.pdf

Description:: IC SRAM 16KBIT PARALLEL 52PLCC

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Product details

Overview

71V321L25JG8 from Renesas Electronics (formerly IDT) is a high-speed, 3.3V, 2K × 8 dual-port static RAM with on-chip interrupt logic and BUSY arbitration for interprocessor communication. It delivers 25 ns max access time, 325 mW typical active power, and 1 mW typical standby power, and supports battery backup data retention down to 2 V. It is used in real-time embedded systems requiring concurrent memory access by two independent controllers - such as dual-CPU industrial controllers or FPGA+MCU co-processing architectures.

For engineers reviewing the 71V321L25JG8 datasheet, 71V321L25JG8 pinout, 71V321L25JG8 application, or 71V321L25JG8 equivalent, key selection considerations include its dual asynchronous port timing, TTL-compatible 3.3V I/O, integrated INT/BUSY signaling, and PLCC-52 packaging for legacy board compatibility and thermal reliability in industrial temperature range (0°C to +70°C).

Technical Context

The 71V321L25JG8 implements fully independent left/right ports with separate address, control, and bidirectional I/O buses, enabling true asynchronous read/write operations without internal synchronization overhead. Its on-chip arbitration logic uses address and chip-enable matching (not R/W state) to assert BUSYL/BUSYR outputs, preventing simultaneous writes to identical addresses.

Interrupt functionality is implemented via dedicated mailbox addresses (7FE_H for INTL, 7FF_H for INTR), where write-to-mailbox sets the flag and read-from-mailbox clears it - all using standard SRAM access cycles without additional protocol overhead. The device operates in battery backup mode at 2 V with ≤500 µA retention current, verified per datasheet Table 7.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Organization	2K × 8 (2048 words × 8 bits); provides 2048-byte shared memory space accessible concurrently from two independent buses.
Access Time (max)	25 ns; enables direct interfacing with 40 MHz bus systems without wait states in high-performance control applications.
Supply Voltage	3.0 V to 3.6 V (typ. 3.3 V); single-supply TTL-compatible operation eliminates level-shifting requirements in mixed-voltage designs.
Standby Current	1 mW typ. (≈300 µA at 3.3 V); supports low-power sleep modes in battery-backed systems while preserving full memory content.
Data Retention Voltage	2.0 V min.; allows use of coin-cell or supercapacitor backup without regulator, reducing BOM count and footprint.
Operating Temperature	0°C to +70°C (Commercial grade); validated for stable timing and leakage performance across full ambient range.
I/O Interface Type	TTL-compatible inputs/outputs; ensures direct connection to legacy microcontrollers, FPGAs, and ASICs without interface logic.

Pinout & Package

71V321L25JG8 is housed in a 52-pin Plastic Leaded Chip Carrier (PLCC) package with J-lead configuration, measuring approximately 19.05 mm × 19.05 mm × 4.32 mm. The package is lead-free (Green) and RoHS-compliant per ordering code suffix 'G'.

Pin/Terminal	Circuit Role	Design Meaning
A0L–A10L	Left port address inputs	11-bit address bus for left-side memory access; supports full 2K addressing without external decoding.
A0R–A10R	Right port address inputs	Independent 11-bit address bus for right-side access; enables true parallel address assertion with no shared bus contention.
I/O0L–I/O7L	Left port bidirectional data	8-bit tri-state data path; driven only when CEL = VIL and OEL = VIL (read) or R/WL = VIL (write).
I/O0R–I/O7R	Right port bidirectional data	Independent 8-bit data bus; electrically isolated from left port - no internal bus coupling or direction control dependency.
CEL / CER	Chip enable (left/right)	Active-low port selection; deassertion (VIH) places respective port in ultra-low-power standby (ISB3 ≤ 0.2 mA).
OEL / OER	Output enable (left/right)	Controls output drivers independently; allows one port to drive data while the other remains in high-Z during arbitration.
R/WL / R/WR	Read/write control (left/right)	Active-low write strobe; determines data flow direction per port without cross-port dependency or timing lockstep.
INTL / INTR	Interrupt flags (left/right)	Open-drain compatible (totem-pole output); asserted when opposite port writes to mailbox addresses 7FE_H/7FF_H.
BUSYL / BUSYR	Arbitration busy flags	Totem-pole outputs; go LOW when opposing port accesses same address, blocking write execution on asserting side.
V_CC	Power supply	Single 3.3 V supply pin; all four V_CC pins (pins 21, 27, 40, 46) must be connected to reduce IR drop and noise coupling.
GND	Ground	Two dedicated ground pins (pins 20, 33); required for stable reference and low-noise operation in high-speed dual-port access.

Key Features

Feature	Design Value
Dual asynchronous ports with independent control	Enables deterministic, zero-latency memory sharing between heterogeneous processors (e.g., ARM + DSP) without software coordination or semaphores.
Hardware BUSY arbitration	Prevents data corruption during simultaneous writes to identical addresses by gating write signals - no firmware intervention required.
Mailbox-style interrupt logic	Uses standard SRAM locations (7FE_H, 7FF_H) as hardware-triggered flags; eliminates polling and reduces CPU interrupt latency to <25 ns.
2 V data retention mode	Preserves full 2K × 8 memory content during main power loss using minimal backup energy - critical for fault logging and state recovery.
52-pin PLCC package	Provides robust thermal dissipation and mechanical reliability in vibration-prone industrial environments; compatible with wave-solder reflow profiles.

Applications

Industrial Dual-Processor PLC	Real-Time Signal Processing Bridge
Use Scenario: Two independent CPUs (e.g., safety core + motion control core) share sensor data and command buffers in a programmable logic controller. IC Role / Device Role / Timing Role: Acts as a non-blocking, hardware-arbitrated shared memory buffer with sub-25 ns access latency and deterministic BUSY signaling for conflict resolution. Use Value: Eliminates software mutex overhead and guarantees atomic mailbox updates - enabling cycle-accurate deterministic response in SIL-3 certified systems.	Use Scenario: An FPGA acquires high-speed ADC samples while an ARM processor performs FFT analysis; both require low-latency access to overlapping buffer regions. IC Role / Device Role / Timing Role: Serves as a zero-wait-state dual-port memory bridge with independent 8-bit I/O paths and hardware write collision detection. Use Value: Enables continuous streaming without pipeline stalls - sustaining >32 MB/s aggregate bandwidth (2 × 16 MB/s) at 25 ns cycle time.
Legacy System Memory Upgrade	Battery-Backed Event Logger
Use Scenario: Retrofitting aging industrial controllers originally using discrete dual-port RAMs or gate-array solutions with higher power and larger footprints. IC Role / Device Role / Timing Role: Drop-in replacement for obsolete 71321/71341 families; matches pinout, timing, and voltage levels of legacy PLCC-52 dual-port SRAMs. Use Value: Reduces board space by 40% and cuts active power by 60% versus older bipolar dual-port devices - extending system thermal margin.	Use Scenario: Remote telemetry unit logs critical fault events to nonvolatile memory during AC power failure, using a coin-cell backup source. IC Role / Device Role / Timing Role: Provides 2 KB of fast-access, battery-retained storage with guaranteed 2 V operation and ≤500 µA retention current. Use Value: Ensures event capture continuity for ≥72 hours on CR2032 cell - meeting IEC 62443-3-3 data integrity requirements.

Industrial Dual-Processor PLC

Real-Time Signal Processing Bridge

Use Scenario: Two independent CPUs (e.g., safety core + motion control core) share sensor data and command buffers in a programmable logic controller.

IC Role / Device Role / Timing Role: Acts as a non-blocking, hardware-arbitrated shared memory buffer with sub-25 ns access latency and deterministic BUSY signaling for conflict resolution.

Use Value: Eliminates software mutex overhead and guarantees atomic mailbox updates - enabling cycle-accurate deterministic response in SIL-3 certified systems.

Use Scenario: An FPGA acquires high-speed ADC samples while an ARM processor performs FFT analysis; both require low-latency access to overlapping buffer regions.

IC Role / Device Role / Timing Role: Serves as a zero-wait-state dual-port memory bridge with independent 8-bit I/O paths and hardware write collision detection.

Use Value: Enables continuous streaming without pipeline stalls - sustaining >32 MB/s aggregate bandwidth (2 × 16 MB/s) at 25 ns cycle time.

Legacy System Memory Upgrade

Battery-Backed Event Logger

Use Scenario: Retrofitting aging industrial controllers originally using discrete dual-port RAMs or gate-array solutions with higher power and larger footprints.

IC Role / Device Role / Timing Role: Drop-in replacement for obsolete 71321/71341 families; matches pinout, timing, and voltage levels of legacy PLCC-52 dual-port SRAMs.

Use Value: Reduces board space by 40% and cuts active power by 60% versus older bipolar dual-port devices - extending system thermal margin.

Use Scenario: Remote telemetry unit logs critical fault events to nonvolatile memory during AC power failure, using a coin-cell backup source.

IC Role / Device Role / Timing Role: Provides 2 KB of fast-access, battery-retained storage with guaranteed 2 V operation and ≤500 µA retention current.

Use Value: Ensures event capture continuity for ≥72 hours on CR2032 cell - meeting IEC 62443-3-3 data integrity requirements.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-port SRAM applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Cypress CY7C024AV-25AXC	2K × 16 organization, 25 ns access, 3.3 V, 52-pin PLCC; lacks integrated BUSY arbitration and mailbox interrupts.	Requires external logic for collision handling and software-managed interrupt signaling - increases design complexity and latency.	Choose when wider data bus (16-bit) is needed and arbitration can be handled externally; verify PCB layout supports higher I/O capacitance.
Renesas 71V3556SA25PFGI	4K × 16, 25 ns, 64-pin TQFP, industrial temp (−40°C to +85°C); includes BUSY but no interrupt flags; higher density and power.	Not pin-compatible; requires PCB redesign; suited for new designs needing extended memory and wider temperature range.	Choose for new industrial designs requiring >2 KB capacity and extended temperature support - not for drop-in replacement of 71V321L25JG8.

Compared with CY7C024AV-25AXC, 71V321L25JG8 offers hardware arbitration and interrupt flags in the same PLCC-52 footprint, reducing firmware overhead and improving real-time determinism. Compared with 71V3556SA25PFGI, it provides exact legacy compatibility and lower power, making it optimal for cost-sensitive commercial-grade retrofits.

Availability

71V321L25JG8 is available at Aetrix Electronics and suitable for industrial automation, real-time embedded control, and legacy system upgrades requiring stable component supply, long-lifecycle support, and RoHS-compliant PLCC packaging.

Supply support for 71V321L25JG8 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 71V321L25JG8 belongs to Renesas' legacy dual-port SRAM product line, designed specifically for deterministic interprocessor communication in real-time embedded systems where hardware arbitration and low-latency mailbox signaling are critical.

FAQ

What is the maximum operating frequency supported by the 71V321L25JG8?

The 71V321L25JG8 supports a maximum read/write cycle time of 25 ns, corresponding to an effective maximum operating frequency of 40 MHz for sustained sequential access. This is validated across the full commercial temperature range (0°C to +70°C) and 3.0 V–3.6 V supply, with timing margins confirmed in datasheet Tables 9 and 10. The 71V321L25JG8 does not specify a clock input; its operation is fully asynchronous and controlled by CE, R/W, and OE timing windows.

Does the 71V321L25JG8 support true simultaneous read operations from both ports?

Yes, the 71V321L25JG8 supports fully independent, asynchronous reads from both left and right ports simultaneously - provided the accessed addresses differ. When addresses match, BUSY logic asserts but does not affect read validity (per datasheet Figure 6 and Table 15). Valid data appears within tAA (≤25 ns) on each port, with no inter-port timing dependency. The 71V321L25JG8's dual-decoder architecture ensures zero-cycle interference during concurrent reads.

How is interrupt clearing implemented in the 71V321L25JG8?

In the 71V321L25JG8, interrupt flags are cleared by reading from the assigned mailbox address: INTL is cleared by reading address 7FE_H with CEL = OEL = VIL, and INTR is cleared by reading 7FF_H with CER = OER = VIL. This is a hardware-level action - no register write or command sequence is required. The 71V321L25JG8 datasheet Truth Table II confirms that the read access itself resets the flag, and the data returned is user-defined content stored at that location.

Can the 71V321L25JG8 operate with mixed voltage interfaces (e.g., 5 V controllers)?

No, the 71V321L25JG8 is strictly a 3.3 V device with TTL-compatible thresholds (VIH = 2.0 V min, VIL = 0.8 V max) and absolute maximum ratings limiting V_TERM to +4.6 V. Direct connection to 5 V logic violates datasheet Table 1 and risks permanent damage. Interfacing with 5 V systems requires level-shifting circuitry - such as dual-supply translators (e.g., TXB0108) - or use of 3.3 V–tolerant microcontrollers/FPGAs. The 71V321L25JG8 does not support 5 V-tolerant I/O.

What is the significance of the 'JG8' suffix in 71V321L25JG8?

The 'JG8' suffix in 71V321L25JG8 decodes as follows: 'J' = 52-pin PLCC package (PLG52), 'G' = lead-free (Green) finish, and '8' = tape-and-reel packaging format. This distinguishes it from tube-packaged variants (e.g., 71V321L25JG). All versions share identical electrical and timing specifications; the suffix solely indicates mechanical and packaging configuration - critical for automated assembly and RoHS compliance verification. The 71V321L25JG8 is rated for commercial temperature range (0°C to +70°C).

71V321L25JG8 Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 52-LCC (J-Lead)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Memory Type:: Volatile

Memory Format:: SRAM

Technology:: SRAM - Dual Port, Asynchronous

Memory Size:: 16Kbit

Memory Organization:: 2K x 8

Memory Interface:: Parallel

Clock Frequency:: -

Write Cycle Time - Word, Page:: 25ns

Access Time:: 25 ns

Voltage - Supply:: 3V ~ 3.6V

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 52-PLCC (19.13x19.13)

71V321L25JG8 FAQ

1.How can I place an order for 71V321L25JG8 through Aetrix?

Please submit a Request for Quotation (RFQ) for 71V321L25JG8 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 71V321L25JG8 reliable?

The price and inventory of 71V321L25JG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71V321L25JG8 is usually 5 days.

3.What payment methods are accepted for 71V321L25JG8?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71V321L25JG8 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 71V321L25JG8?

71V321L25JG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 71V321L25JG8 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 71V321L25JG8?

For technical support, including 71V321L25JG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71V321L25JG8 requirements.

6.How does Aetrix verify that 71V321L25JG8 is sourced from the original manufacturer or authorized distributors?

All 71V321L25JG8 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 71V321L25JG8 meets industry standards.

7.What is the process for return or replacement of 71V321L25JG8?

All 71V321L25JG8 units undergo pre-shipment inspection (PSI). If there is an issue with 71V321L25JG8, 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 71V321L25JG8 part is unused and in its original packaging.

Return procedure for 71V321L25JG8:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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