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Renesas 71V321L25JG
- Part No.:
- 71V321L25JG
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
71V321L25JG.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:240
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Product details
Overview
71V321L25JG 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, supports independent asynchronous read/write on left/right ports, operates across commercial temperature range (0°C to +70°C), and features battery-backed data retention down to 2V - used in real-time embedded control systems requiring concurrent memory access.
For engineers reviewing the 71V321L25JG datasheet, 71V321L25JG pinout, 71V321L25JG application, or 71V321L25JG equivalent, key selection criteria include dual-port timing coordination, INT/BUSY flag behavior, 52-pin PLCC mechanical compatibility, and low-power standby current (≤5 µA) under full CMOS-level disable conditions.
Technical Context
The 71V321L25JG implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port. Its on-chip arbitration logic asserts BUSYL/BUSYR outputs when both ports access the same address simultaneously - using chip enable and address match detection only, independent of R/W direction.
Interrupt functionality uses dedicated mailbox addresses (7FEH for left port INTL, 7FFH for right port INTR), where write operations by one port set the opposite port's interrupt flag. The device supports TTL-compatible signaling and requires no external pull-ups on BUSY/INT outputs due to totem-pole drive structure.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 bits (2048 words × 8-bit wide), providing 16,384 total bits accessible from either port |
| Access Time (max) | 25 ns - defines minimum read cycle time (tRC) and guarantees valid data setup before next address transition |
| Supply Voltage | 3.3 V ± 0.3 V - single-supply operation compatible with modern 3.3V logic families; no 5V tolerance |
| Standby Current (ISB3) | 0.2 µA (typ.) - enables ultra-low-power retention mode when all inputs held at CMOS levels (VIN < 0.2 V or > VCC − 0.2 V) |
| Data Retention Voltage | 2.0 V (min.) - maintains stored data during brown-out or backup-battery operation without refresh |
| Operating Temperature | 0°C to +70°C - commercial-grade qualification; not rated for industrial −40°C to +85°C range |
| Package | 52-pin PLCC (PLG52) - surface-mount, leaded package with 0.75″ × 0.75″ footprint and 0.17″ height |
Pinout & Package
71V321L25JG is housed in a 52-pin Plastic Leaded Chip Carrier (PLCC, code PLG52) with J-lead configuration. Pin 1 is located at the index corner; leads are arranged counterclockwise. All VCC pins must be connected to 3.3V supply; all GND pins require solid ground connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A10L | Left port address inputs | 11-bit address bus selecting one of 2048 locations for left-side access |
| A0R–A10R | Right port address inputs | Independent 11-bit address bus for right-side memory access |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit data path; driven high-Z when OEL = VIH or CEL = VIH |
| I/O0R–I/O7R | Right port bidirectional data | 8-bit data path; isolated from left port unless same address accessed concurrently |
| CEL / CER | Chip enable (left/right) | Active-low enables respective port; deassertion places port in ISB1/ISB2 standby mode |
| OEL / OER | Output enable (left/right) | Active-low controls output drivers; high-Z when disabled, regardless of CE state |
| R/WL / R/WR | Read/write control (left/right) | Active-low indicates write; high indicates read - determines data flow direction on I/O bus |
| INTL / INTR | Interrupt flags (output) | Open-drain-compatible totem-pole outputs; asserted low upon mailbox write (7FEH/7FFH) |
| BUSYL / BUSYR | Arbitration busy flags (output) | Totem-pole outputs indicating port contention; internally gate writes when asserted low |
| VCC, GND | Power and ground | Multiple VCC (pins 21, 33, 47) and GND (pins 27, 32) pins required for noise immunity and thermal dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Dual-port arbitration with BUSY outputs | Hardware-enforced mutual exclusion on shared addresses - eliminates software polling and reduces inter-processor latency |
| On-chip interrupt mailbox logic | Two dedicated SRAM locations (7FEH, 7FFH) act as hardware-triggered message flags between ports without CPU intervention |
| 2V data retention capability | Preserves memory contents during power loss or battery-backup operation - critical for fault-tolerant control state storage |
| Ultra-low ISB3 standby current | 0.2 µA typical consumption in full CMOS-disable mode - extends battery life in always-on embedded systems |
| 52-pin PLCC mechanical compatibility | Standard footprint allows drop-in replacement in legacy designs using IDT71V321-series PLCC layouts |
Applications
| Industrial PLC Communication Module | Real-Time Signal Processing Bridge |
|---|---|
Use Scenario: Two microcontrollers exchange sensor data and control commands via shared memory in a programmable logic controller. IC Role / Device Role / Timing Role: Dual-port RAM serves as synchronized message buffer with hardware arbitration preventing simultaneous writes to same register. Use Value: Eliminates need for external semaphores or polling loops; BUSY assertion stalls contending CPU until memory access completes. | Use Scenario: An FPGA-accelerated DSP core reads raw ADC samples while an ARM host writes configuration parameters and reads processed results. IC Role / Device Role / Timing Role: 71V321L25JG provides non-blocking, low-latency memory interface between heterogeneous processors operating at different clock domains. Use Value: 25 ns access enables real-time throughput matching 40 MHz bus rates; interrupt flags signal completion without CPU overhead. |
| Redundant Controller Failover System | Legacy Bus Protocol Translator |
Use Scenario: Primary and backup controllers maintain identical operational states mirrored in shared RAM, with automatic switchover triggered by watchdog timeout. IC Role / Device Role / Timing Role: Acts as fault-tolerant state repository with 2V data retention preserving critical context during brown-out events. Use Value: Enables sub-millisecond failover; ISB3 current ≤0.2 µA minimizes backup battery drain during extended idle periods. | Use Scenario: Translating between legacy 8-bit parallel bus peripherals (e.g., ISA-based I/O cards) and modern microcontroller subsystems. IC Role / Device Role / Timing Role: Bridges timing-asymmetric interfaces using independent port handshaking (CE/OE/RW) without glue logic. Use Value: PLCC package simplifies through-hole prototyping; TTL-compatible voltage thresholds ensure interoperability with older 3.3V/5V mixed-signal systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C024AV-25AXC | 2K × 16 organization, 25 ns access, 3.3V supply, 100-pin TQFP - wider data bus but larger footprint and no built-in interrupt logic | Requires external logic for mailbox/interrupt emulation; better suited for 16-bit data paths than interprocessor signaling | Select when system needs 16-bit word access or higher density; avoid if interrupt-driven messaging is required |
| AS7C3256B-25JC | 32K × 8 organization, 25 ns access, 3.3V supply, 44-pin SOJ - higher capacity but lacks BUSY arbitration and interrupt flags | No hardware contention management; relies on software protocols for multi-CPU coordination | Choose for cost-sensitive, single-processor applications needing more memory; not suitable for real-time dual-CPU synchronization |
Compared with CY7C024AV-25AXC and AS7C3256B-25JC, the 71V321L25JG uniquely integrates hardware arbitration and interrupt mailbox logic in a compact 52-pin PLCC - making it optimal for deterministic, low-overhead interprocessor communication where timing predictability and minimal firmware complexity are essential.
Availability
71V321L25JG is available at Aetrix Electronics and suitable for industrial PLC communication modules, real-time signal processing bridges, redundant controller failover systems, and legacy bus protocol translators requiring stable component supply and long-term obsolescence support.
Supply support for 71V321L25JG 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 71V321L25JG belongs to Renesas' legacy dual-port SRAM product line, designed specifically for deterministic interprocessor communication in real-time embedded systems where hardware-managed memory coherency is critical.
FAQ
What is the maximum operating speed of the 71V321L25JG?
The 71V321L25JG has a guaranteed maximum access time of 25 ns, corresponding to a read cycle time (tRC) of 25 ns. This specification applies across the commercial temperature range (0°C to +70°C) and 3.3V ± 0.3V supply. The device does not support faster operation - exceeding this limit risks data corruption or timing violations in either port.
Does the 71V321L25JG support industrial temperature range?
No, the 71V321L25JG is qualified only for commercial temperature range (0°C to +70°C). Industrial-grade variants such as 71V321L25JGI exist but use different orderable part numbers and are packaged in PLCC with 'I' suffix. The 71V321L25JG itself carries 'C' grade marking and is not tested or warranted for operation below 0°C or above +70°C.
How does the BUSY arbitration logic function in the 71V321L25JG?
The 71V321L25JG asserts BUSYL or BUSYR when both ports attempt to access the same memory address simultaneously. Arbitration depends solely on chip enable (CEL/CER) and address (A0–A10) signals - not R/W state. If contention occurs, the port that satisfies tAPS (5 ns priority setup time) first proceeds; the other port's BUSY output goes low, gating its write operation. Writes are ignored, not queued.
Can the 71V321L25JG retain data during power loss?
Yes, the 71V321L25JG supports data retention at VCC ≥ 2.0 V. When supply drops below 3.0 V but remains ≥ 2.0 V, the device enters retention mode consuming ≤500 µA (typ. 100 µA). Data remains valid indefinitely under these conditions, enabling use with backup batteries or supercapacitors in safety-critical systems.
What are the interrupt mailbox addresses for the 71V321L25JG?
The 71V321L25JG uses fixed SRAM addresses for interrupt signaling: writing to location 7FEH (2046 decimal) sets the left port's INTL flag, and writing to 7FFH (2047 decimal) sets the right port's INTR flag. Clearing is performed by reading those same addresses with OE and CE active - no dedicated control registers or command sequences are required.
71V321L25JG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 52-LCC (J-Lead)
- Packaging:
- Tube
- 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)
71V321L25JG FAQ
1.How can I place an order for 71V321L25JG through Aetrix?
Please submit a Request for Quotation (RFQ) for 71V321L25JG 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 71V321L25JG reliable?
The price and inventory of 71V321L25JG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71V321L25JG is usually 5 days.
3.What payment methods are accepted for 71V321L25JG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71V321L25JG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71V321L25JG?
71V321L25JG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71V321L25JG 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 71V321L25JG?
For technical support, including 71V321L25JG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71V321L25JG requirements.
6.How does Aetrix verify that 71V321L25JG is sourced from the original manufacturer or authorized distributors?
All 71V321L25JG 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 71V321L25JG meets industry standards.
7.What is the process for return or replacement of 71V321L25JG?
All 71V321L25JG units undergo pre-shipment inspection (PSI). If there is an issue with 71V321L25JG, 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 71V321L25JG part is unused and in its original packaging.
Return procedure for 71V321L25JG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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