My Inquiry
My Account
Renesas 71V321L25PFG8
- Part No.:
- 71V321L25PFG8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
71V321L25PFG8.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,314
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
71V321L25PFG8 from Renesas Electronics is a high-speed 3.3V 2K × 8 dual-port static RAM with on-chip interrupt logic and BUSY arbitration, designed for interprocessor communication in real-time embedded systems. It delivers 25 ns max access time, 325 mW typical active power, and supports battery backup data retention down to 2 V - used in industrial control co-processor memory buffers and redundant CPU subsystems.
For engineers reviewing the 71V321L25PFG8 datasheet, 71V321L25PFG8 pinout, 71V321L25PFG8 application, or 71V321L25PFG8 equivalent, key selection criteria include dual-port asynchronous timing, TTL-compatible 3.3V operation, interrupt mailbox addressing (7FEh/7FFh), and industrial-grade temperature support (–40°C to +85°C) in TQFP packaging.
Technical Context
The 71V321L25PFG8 implements fully independent left/right ports with separate address, control, and bidirectional I/O buses, enabling concurrent read/write access without software coordination. Its hardware arbitration uses address and chip-enable matching to assert BUSYL/BUSYR outputs - totem-pole, no pull-ups required - to stall conflicting accesses.
Interrupt functionality relies on dedicated mailbox addresses: writing to 7FFh (right port) sets INTR; reading 7FFh clears it; writing to 7FEh (left port) sets INTL; reading 7FEh clears it. All interrupt timing is specified with tINS/tINR ≤ 25 ns (25 ns speed grade), and BUSY-to-data-valid delay (tBDD) is guaranteed ≤ 30 ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 bits (2048 words × 8-bit wide), fully random-access SRAM array |
| Access Time (max) | 25 ns - defines minimum read cycle time (tRC) for timing-critical real-time inter-processor handshaking |
| Supply Voltage | 3.0 V to 3.6 V - single 3.3V ±0.3V rail, TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) |
| Active Power (typ) | 325 mW - enables low-thermal-footprint integration in dense multi-CPU modules |
| Data Retention | 2.0 V minimum - supports battery-backed operation during main power loss (L-version only) |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including factory automation and transportation control |
| Package | 64-pin TQFP (PNG64), 10 mm × 10 mm × 1.4 mm - surface-mount compatible with standard reflow profiles |
Pinout & Package
71V321L25PFG8 is housed in a 64-pin Thin Quad Flatpack (TQFP) package per Renesas PPG64/PNG64 specification. Pin functions are symmetric across left (L) and right (R) ports, with dedicated control, address, I/O, and status signals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A10L / A0R–A10R | Address Inputs (Left/Right) | 11-bit address bus per port - selects one of 2048 memory locations independently |
| I/O0L–I/O7L / I/O0R–I/O7R | Bidirectional Data I/O (Left/Right) | 8-bit parallel data path per port - high-impedance when OE = VIH or CE = VIH |
| CEL / CER | Chip Enable (Left/Right) | Active-low enable - controls port power-down mode (ISB3 ≤ 0.2 mA at CMOS-level inputs) |
| OEL / OER | Output Enable (Left/Right) | Active-low tri-state control - separates read output drive from write input sampling |
| R/WL / R/WR | Read/Write Control (Left/Right) | Active-low write command - combined with CE and OE to define read/write cycle boundaries |
| INTL / INTR | Interrupt Flag Outputs (Left/Right) | Open-drain compatible (totem-pole), asserted when opposite port writes to 7FEh/7FFh mailboxes |
| BUSYL / BUSYR | Arbitration Busy Outputs (Left/Right) | Totem-pole outputs - indicate port contention on identical address access; gate internal write paths |
| VCC / GND | Power & Ground | Multiple VCC (pins 32, 48, 64) and GND (pins 33, 49, 63) pins - reduce switching noise and improve signal integrity |
Key Features
| Feature | Design Value |
|---|---|
| Dual-port asynchronous operation | Independent left/right access with no shared clocks or synchronization overhead - enables lock-free inter-CPU messaging |
| Hardware BUSY arbitration | Automatic port conflict detection via address+CE matching - eliminates need for external semaphores or polling |
| Interrupt mailbox addressing | User-configurable 7FEh (INTL) and 7FFh (INTR) locations - provide deterministic, low-latency event signaling between processors |
| Battery backup data retention | Operates down to 2.0 V with ≤500 µA retention current - preserves critical state during brown-out or controlled shutdown |
| Industrial temperature range | –40°C to +85°C operation with full AC/DC specs - suitable for uncontrolled ambient deployments without derating |
Applications
| Industrial PLC Co-Processor Buffer | Avionics Dual-Channel Memory Bridge |
|---|---|
Use Scenario: Two independent microcontrollers exchange sensor data and control commands in a programmable logic controller chassis. IC Role / Device Role / Timing Role: 71V321L25PFG8 serves as shared memory with hardware arbitration - left port connects to main CPU, right port to safety monitor CPU. Use Value: 25 ns access and BUSY-driven stall prevent race conditions during simultaneous access to shared configuration registers. |
Use Scenario: Redundant flight control computers require synchronized memory updates with fault isolation. IC Role / Device Role / Timing Role: 71V321L25PFG8 acts as cross-channel data buffer - each channel writes status to its dedicated mailbox (7FEh/7FFh) and reads the other's. Use Value: Hardware interrupts eliminate polling latency; 2 V data retention maintains last-known-safe state during power transition. |
| Medical Imaging Real-Time Frame Buffer | Automotive ADAS Sensor Fusion Hub |
Use Scenario: High-speed image acquisition processor streams frames to display engine while both operate concurrently. IC Role / Device Role / Timing Role: 71V321L25PFG8 provides ping-pong frame storage - left port accepts DMA writes from ADC interface, right port feeds video DAC. Use Value: Asynchronous dual-port operation avoids FIFO bottlenecks; 325 mW active power fits thermal budget in sealed enclosures. |
Use Scenario: Radar and camera processors share object detection metadata in autonomous driving ECU. IC Role / Device Role / Timing Role: 71V321L25PFG8 functions as low-latency fusion memory - left port receives radar track lists, right port supplies fused objects to decision module. Use Value: 25 ns access ensures sub-millisecond metadata exchange; industrial temp rating supports under-hood deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C136-25JC | 52-pin PLCC, 25 ns, 3.3V, no built-in BUSY logic - requires external arbitration circuitry | Lacks hardware interrupt/mailbox; needs additional glue logic for interprocessor signaling | Choose when footprint compatibility with legacy PLCC layouts is required and arbitration can be handled externally |
| AS7C3256B-25JC | 256K × 8, 25 ns, 3.3V, single-port only - no dual-port or interrupt capability | No native interprocessor features; must implement software-managed shared memory with semaphore registers | Consider only if higher density is needed and dual-port arbitration is implemented in firmware or FPGA logic |
Compared with CY7C136-25JC and AS7C3256B-25JC, the 71V321L25PFG8 uniquely integrates hardware BUSY arbitration and interrupt mailbox logic in a single 64-pin TQFP - reducing BOM count, PCB area, and firmware complexity for tightly coupled dual-CPU systems.
Availability
71V321L25PFG8 is available at Aetrix Electronics and suitable for industrial PLC co-processor buffers, avionics dual-channel memory bridges, and medical imaging real-time frame buffers requiring stable component supply across extended product lifecycles.
Supply support for 71V321L25PFG8 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 industrial, automotive, and infrastructure markets.
The 71V321L series was developed by IDT (acquired by Renesas in 2019) specifically for deterministic interprocessor communication - targeting applications where hardware-enforced memory coherency and low-latency event signaling replace software-based synchronization.
FAQ
What is the maximum operating temperature range for the 71V321L25PFG8?
The 71V321L25PFG8 is rated for industrial temperature operation from –40°C to +85°C, with all DC and AC electrical specifications guaranteed across this full range. This makes it suitable for deployment in factory automation, transportation control, and outdoor embedded systems without thermal derating.
Does the 71V321L25PFG8 support battery backup operation?
Yes, the 71V321L25PFG8 supports battery backup data retention down to 2.0 V, consuming ≤500 µA in retention mode. This feature is exclusive to the "L" (low-power) version and enables preservation of critical configuration or state data during main power loss - confirmed in datasheet Table 7.
How does the BUSY arbitration logic work in the 71V321L25PFG8?
The 71V321L25PFG8 asserts BUSYL or BUSYR when both ports attempt access to the same memory address simultaneously. Arbitration is based solely on address and chip-enable (CE) signals - not read/write direction - and gates internal write paths on the losing port. BUSY outputs are totem-pole, requiring no external pull-ups.
What are the interrupt mailbox addresses for the 71V321L25PFG8?
The 71V321L25PFG8 uses fixed interrupt mailbox addresses: writing to address 7FEh (hex) on the right port sets the left-port INTL flag; writing to 7FFh on the left port sets the right-port INTR flag. Reading those same addresses clears the respective flags - all timing parameters (tINS/tINR) are specified at ≤25 ns for the 25 ns speed grade.
Is the 71V321L25PFG8 pin-compatible with other speed grades in the same package?
Yes, all 71V321L variants in the 64-pin TQFP (PNG64) package - including 71V321L25PFG8, 71V321L35PFGI8, and 71V321L55PFGI8 - share identical pinouts and footprint. Only timing parameters (access time, power consumption) differ; no PCB redesign is needed when upgrading or downgrading speed grades within the same temperature grade.
71V321L25PFG8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 64-LQFP
- 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:
- 64-TQFP (14x14)
71V321L25PFG8 FAQ
1.How can I place an order for 71V321L25PFG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71V321L25PFG8 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 71V321L25PFG8 reliable?
The price and inventory of 71V321L25PFG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71V321L25PFG8 is usually 5 days.
3.What payment methods are accepted for 71V321L25PFG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71V321L25PFG8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71V321L25PFG8?
71V321L25PFG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71V321L25PFG8 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 71V321L25PFG8?
For technical support, including 71V321L25PFG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71V321L25PFG8 requirements.
6.How does Aetrix verify that 71V321L25PFG8 is sourced from the original manufacturer or authorized distributors?
All 71V321L25PFG8 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 71V321L25PFG8 meets industry standards.
7.What is the process for return or replacement of 71V321L25PFG8?
All 71V321L25PFG8 units undergo pre-shipment inspection (PSI). If there is an issue with 71V321L25PFG8, 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 71V321L25PFG8 part is unused and in its original packaging.
Return procedure for 71V321L25PFG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71V321L25PFG8 Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
