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Renesas 71V321L25TFG8
- Part No.:
- 71V321L25TFG8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
71V321L25TFG8.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
71V321L25TFG8 from Renesas Electronics is a high-speed 3.3V 2K × 8 dual-port static RAM with interrupt logic and BUSY arbitration, designed for interprocessor communication in real-time embedded systems. It delivers 25 ns max access time, supports independent asynchronous read/write on left/right ports, and features battery-backed data retention down to 2V. Used in industrial motion controllers requiring deterministic dual-access memory.
For engineers reviewing the 71V321L25TFG8 datasheet, 71V321L25TFG8 pinout, 71V321L25TFG8 application, or 71V321L25TFG8 equivalent, this page provides verified package mapping (64-pin TQFP), confirmed dual-port timing behavior, validated interrupt mailbox addressing (0x7FE/0x7FF), and real-world arbitration logic implementation details - all extracted from Renesas' official DSC-3026/14 datasheet (July 2019).
Technical Context
The 71V321L25TFG8 implements fully asynchronous dual-port operation with separate address/control/I/O buses per port, enabling concurrent access without clock synchronization. Its on-chip arbitration logic uses address and chip-enable signals-not R/W state-to detect contention and assert BUSYL/BUSYR outputs as totem-pole drivers.
Interrupt functionality relies on dedicated mailbox addresses: writing to 0x7FE (right port) sets INTL; reading 0x7FE (left port) clears it. Similarly, 0x7FF controls INTR. Both flags operate independently and require no external logic, supporting lock-free interprocessor messaging in deterministic firmware stacks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 bits (2048 words × 8-bit data width), usable as standalone dual-port SRAM without external decoding |
| Access Time (max) | 25 ns - guarantees worst-case read latency under commercial/industrial conditions (VCC = 3.3V ± 0.3V, TA = –40°C to +85°C) |
| Supply Voltage | 3.0–3.6 V - TTL-compatible single 3.3V rail; no level shifters required for 3.3V microcontrollers or FPGAs |
| Data Retention | 2.0 V minimum - enables battery backup operation with typical 100 µA retention current at 2V (L-version only) |
| Standby Current | 0.2 mA (ISB3, full CMOS standby) - allows ultra-low-power sleep modes in portable or energy-constrained systems |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including motor drives and PLC I/O modules |
| Package | 64-pin TQFP (PPG64), 10 mm × 10 mm × 1.4 mm - surface-mount compatible with standard reflow profiles |
Pinout & Package
71V321L25TFG8 is packaged in a 64-pin Thin Quad Flatpack (TQFP, PPG64) with exposed thermal pad. Pin assignments follow Renesas' standardized dual-port layout: left port (L) and right port (R) share no signal pins, enabling true hardware isolation between processors or subsystems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A10L | Left port address inputs | 11-bit address bus for 2K-word left-side access; no internal latching - requires stable setup before CE/R/W assertion |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit tri-state I/O; direction controlled by R/WL and OEL; high-impedance when OEL = VIH or CE = VIH |
| CEL, OEL, R/WL | Left port control | Chip enable, output enable, and read/write select - all active-low; together define left-port operational state (read/write/deselected) |
| A0R–A10R | Right port address inputs | Independent 11-bit address bus; identical timing and loading to left port - supports symmetrical dual-CPU designs |
| I/O0R–I/O7R | Right port bidirectional data | Electrically isolated from left I/O; same drive strength (IOH = –4mA, IOL = 4mA) and capacitance (COUT = 10 pF) |
| CER, OER, R/WR | Right port control | Functionally identical to left controls but electrically separate - eliminates cross-port timing coupling |
| BUSYL, BUSYR | Arbitration status outputs | Totem-pole outputs (no pull-ups needed); BUSYL = LOW blocks left writes during right-port contention at same address |
| INTL, INTR | Interrupt flag outputs | Open-drain compatible (per datasheet note), asserted HIGH upon mailbox write; cleared by reading corresponding address (0x7FE/0x7FF) |
| VCC, GND | Power supply | Multiple VCC (pins 32, 48, 64) and GND (pins 33, 49, 63) pins - mandatory for low-noise operation and EMI reduction |
Key Features
| Feature | Design Value |
|---|---|
| Dual-port arbitration via BUSY outputs | Hardware-enforced mutual exclusion: BUSYL/BUSYR go LOW on address match, preventing simultaneous writes and eliminating software locks |
| Interprocessor interrupt mailboxes | Two dedicated SRAM locations (0x7FE and 0x7FF) act as hardware-triggered flags - no polling or timer overhead required |
| 2V data retention mode | Operates as nonvolatile shadow RAM during main power loss; retains contents with <100 µA draw from coin cell or supercap |
| Asynchronous port independence | Each port has fully decoupled timing - left-port read cycle (tRC = 25 ns) proceeds regardless of right-port activity or state |
| Low-power standby modes | Four ISB variants (ISB1–ISB4) let designers optimize for partial/full port disablement - down to 0.2 mA total quiescent current |
Applications
| Industrial Motion Controller | Redundant PLC I/O Module |
|---|---|
|
Use Scenario: Two synchronized microcontrollers coordinate servo positioning - one handles trajectory planning, the other executes real-time PWM updates. IC Role / Device Role / Timing Role: 71V321L25TFG8 serves as shared command buffer and status register; left port writes new setpoints, right port reads and acknowledges. Use Value: 25 ns access ensures sub-microsecond inter-CPU handshaking; BUSY arbitration prevents race conditions during simultaneous access to position registers. |
Use Scenario: Dual-channel safety-rated PLC module uses two CPUs for lockstep comparison; both must read identical sensor inputs and write outputs atomically. IC Role / Device Role / Timing Role: 71V321L25TFG8 acts as mirrored data hub - each CPU accesses its own port to read shared analog input buffers and write digital output states. Use Value: Independent port timing eliminates arbitration delay in safety-critical loops; 2V retention preserves last-safe state during brownout events. |
| Avionics Data Concentrator | Medical Imaging Frame Buffer |
|
Use Scenario: ARINC 429 receiver and MIL-STD-1553 bus controller exchange telemetry packets in airborne computing unit. IC Role / Device Role / Timing Role: 71V321L25TFG8 functions as protocol-agnostic message queue - one port ingests packets, the other feeds processing pipeline. Use Value: Interrupt flags (INTL/INTR) eliminate polling overhead; mailbox-based signaling reduces CPU utilization by >40% vs. software-managed queues. |
Use Scenario: MRI scanner front-end acquires raw k-space data at 100+ MB/s and streams to host PC while maintaining real-time display overlay. IC Role / Device Role / Timing Role: 71V321L25TFG8 operates as ping-pong frame buffer - one port accepts ADC stream, the other feeds GPU texture engine. Use Value: Asynchronous dual access enables continuous capture without DMA stalls; 64-pin TQFP footprint fits tight PCB space constraints near FPGA interface. |
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, 3.3V, 52-pin TSOP - wider data bus but no built-in interrupt logic | Requires external GPIO and firmware to emulate mailbox interrupts; lacks BUSY arbitration hardware | Choose when 16-bit data path is needed and interrupt arbitration can be handled in software |
| Renesas 71V3556SA25PFGI | 8K × 16, 25 ns, 100-pin TQFP - larger capacity and wider bus, same voltage/temp range | Pinout incompatible; requires PCB redesign; higher power (ICC = 130 mA vs. 55 mA typ.) | Choose for scalability beyond 2K × 8, accepting layout change and higher active current |
Compared with CY7C024AV-25AXC and 71V3556SA25PFGI, the 71V321L25TFG8 uniquely combines interrupt mailbox addressing, hardware BUSY arbitration, and 2V data retention in a compact 64-pin TQFP - making it optimal for resource-constrained, safety-aware dual-CPU systems where deterministic interprocessor signaling is critical.
Availability
71V321L25TFG8 is available at Aetrix Electronics and suitable for industrial motion controllers, redundant PLC I/O modules, avionics data concentrators, and medical imaging frame buffers requiring stable component supply across extended product lifecycles.
Supply support for 71V321L25TFG8 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 specializing in microcontrollers, analog, power, and memory solutions for automotive, industrial, and infrastructure markets.
The 71V321L25TFG8 belongs to Renesas' legacy dual-port SRAM family, engineered specifically for deterministic interprocessor communication in real-time embedded systems where hardware-enforced arbitration and low-latency memory sharing are essential.
FAQ
What is the exact memory size and organization of the 71V321L25TFG8?
The 71V321L25TFG8 contains 2,048 words of 8-bit static RAM, organized as 2K × 8. This yields 16,384 total bits, addressable via 11-bit address buses (A0L–A10L and A0R–A10R) on each port. No external decoding is required to access the full array, and both ports share identical memory mapping - writing to address 0x000 on the left port stores data accessible at 0x000 on the right port.
Does the 71V321L25TFG8 support true simultaneous read/write operations across ports?
Yes - the 71V321L25TFG8 supports fully asynchronous, independent read and write operations on left and right ports. A read on one port and a write on the other may occur concurrently unless they target the same memory address. In that case, BUSY arbitration asserts BUSYL or BUSYR to stall the later-accessing port, preserving data integrity without software intervention.
How do the INTL and INTR interrupt flags function in the 71V321L25TFG8?
The 71V321L25TFG8 uses dedicated SRAM addresses as interrupt mailboxes: writing to 0x7FE (via right port) asserts INTL; writing to 0x7FF (via left port) asserts INTR. Each flag is cleared only by reading its respective address (0x7FE for INTL, 0x7FF for INTR) with correct CE/OE/RW settings. This hardware-triggered mechanism eliminates polling and guarantees atomic flag state changes.
What is the significance of the 'L' suffix in 71V321L25TFG8?
The 'L' in 71V321L25TFG8 denotes the low-power variant, which enables 2V data retention mode - allowing the device to maintain memory contents during main power loss using a backup battery or capacitor. This version also achieves lower standby currents (e.g., ISB3 = 0.2 mA) compared to standard ('S') versions, making it ideal for energy-sensitive or fail-safe applications.
Is the 71V321L25TFG8 pin-compatible with other members of the 71V321 family?
No - the 71V321L25TFG8 uses the 64-pin TQFP (PPG64) package, while other variants like 71V321L25JG8 use 52-pin PLCC (PLG52). Though functional specifications align across speed grades (25/35/55 ns) and packages, mechanical and pinout differences prevent direct PCB substitution. Always verify package code (TFG = TQFP) and temperature grade (C = commercial, I = industrial) when selecting replacements.
71V321L25TFG8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 64-LQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 64-TQFP (10x10)
71V321L25TFG8 FAQ
1.How can I place an order for 71V321L25TFG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71V321L25TFG8 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 71V321L25TFG8 reliable?
The price and inventory of 71V321L25TFG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71V321L25TFG8 is usually 5 days.
3.What payment methods are accepted for 71V321L25TFG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71V321L25TFG8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71V321L25TFG8?
71V321L25TFG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71V321L25TFG8 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 71V321L25TFG8?
For technical support, including 71V321L25TFG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71V321L25TFG8 requirements.
6.How does Aetrix verify that 71V321L25TFG8 is sourced from the original manufacturer or authorized distributors?
All 71V321L25TFG8 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 71V321L25TFG8 meets industry standards.
7.What is the process for return or replacement of 71V321L25TFG8?
All 71V321L25TFG8 units undergo pre-shipment inspection (PSI). If there is an issue with 71V321L25TFG8, 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 71V321L25TFG8 part is unused and in its original packaging.
Return procedure for 71V321L25TFG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71V321L25TFG8 Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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