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Renesas 71V321L25TFGI
- Part No.:
- 71V321L25TFGI
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
71V321L25TFGI.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:276
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Product details
Overview
71V321L25TFGI 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 reads/writes on left and right ports, and features battery-backed data retention down to 2.0 V. It is used in real-time embedded systems requiring concurrent memory access between two processors or DMA engines.
For engineers reviewing the 71V321L25TFGI datasheet, 71V321L25TFGI pinout, 71V321L25TFGI application, or 71V321L25TFGI equivalent, key selection criteria include dual-port timing coordination, INT/BUSY flag behavior, 2.0 V data retention capability, TQFP-64 industrial-grade packaging, and compatibility with TTL-level 3.3 V I/O interfaces.
Technical Context
The 71V321L25TFGI implements fully asynchronous dual-port architecture with separate address, control, and bidirectional I/O buses per port. Its on-chip arbitration logic uses address and chip-enable matching-not R/W state-to assert BUSYL/BUSYR outputs, enabling hardware-controlled contention resolution without software intervention.
Interrupt functionality is implemented via dedicated mailbox addresses: writing to 7FEH on the right port sets INTL; writing to 7FFH on the left port sets INTR. Both flags are cleared by reading their respective mailbox addresses, supporting lock-free inter-processor messaging in deterministic real-time systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 bits (2048 words × 8-bit data width), providing 16 KB total storage accessible concurrently from two independent ports |
| Access Time (tAA) | 25 ns max - defines worst-case delay from stable address/CE to valid data output, critical for tight-cycle deterministic systems |
| Supply Voltage | 3.0 V to 3.6 V - single 3.3 V nominal rail with ±0.3 V tolerance; supports direct interface with 3.3 V logic families |
| Data Retention Voltage | 2.0 V min - enables battery backup operation with ≤500 µA retention current, preserving contents during main power loss |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments without derating; validated across full voltage and timing specs |
| Package | 64-pin TQFP (PPG64), 10 mm × 10 mm × 1.4 mm body - surface-mount compatible with standard reflow profiles and automated assembly |
| Power Consumption | Active: 55 mA typ. (182 mW at 3.3 V); Full standby: 0.2 mA typ. (0.66 mW) - enables low-power modes during processor idle cycles |
Pinout & Package
71V321L25TFGI is housed in a 64-pin Thin Quad Flatpack (TQFP, package code PPG64) with exposed thermal pad. Pin functions are symmetrically distributed for left (L) and right (R) ports, including dual sets of address (A0–A10), data I/O (I/O0–I/O7), and control signals (CE, OE, R/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pins 32, 47, 64) | Power supply input | All three VCC pins must be connected to 3.3 V; decoupling required at each pin per layout guidelines |
| GND (Pins 31, 46) | Ground reference | Both GND pins must connect to system ground plane; low-inductance return path essential for signal integrity |
| CEL / CER | Chip enable (left/right) | Active-low enable for respective port; drives port into low-power standby when high |
| OEL / OER | Output enable (left/right) | Active-low control for I/O bus drivers; high-impedance state when deasserted |
| R/WL / R/WR | Read/write direction (left/right) | High = read, low = write; controls internal data path direction and bus driver state |
| BUSYL / BUSYR | Arbitration status flag (left/right) | Totem-pole output; low indicates port access blocked due to address match on opposite port |
| INTL / INTR | Interrupt flag (left/right) | Open-drain-compatible output; asserted when opposite port writes to mailbox address (7FEH/7FFH) |
| A0L–A10L / A0R–A10R | Address inputs (left/right) | 11-bit address bus per port; decoded internally to select one of 2048 memory locations |
| I/O0L–I/O7L / I/O0R–I/O7R | Bidirectional data bus (left/right) | 8-bit parallel data path; driven during write, tri-stated during read unless OE active |
Key Features
| Feature | Design Value |
|---|---|
| Dual-port arbitration with BUSY outputs | Hardware-enforced mutual exclusion: BUSYL/BUSYR go low on address match, blocking writes without software polling |
| Interprocessor interrupt mailbox | Dedicated SRAM locations (7FEH, 7FFH) serve as hardware-triggered message registers-no firmware overhead for flag management |
| 2.0 V data retention mode | Operates from backup battery at 2.0 V with ≤500 µA current, preserving memory state during main power failure |
| Asynchronous port independence | No clock required; each port operates fully independently-enables mixed timing domains (e.g., DSP + microcontroller) |
| TTL-compatible 3.3 V I/O | VIH = 2.0 V min, VIL = 0.8 V max-directly interfaces with legacy 3.3 V logic without level shifters |
Applications
| Industrial PLC Controller | Real-Time Signal Processing System |
|---|---|
|
Use Scenario: Two independent CPUs (control CPU and motion CPU) share sensor/actuator data in a programmable logic controller chassis. IC Role / Device Role / Timing Role: 71V321L25TFGI serves as shared memory buffer with hardware arbitration-BUSY signals stall conflicting writes, preventing race conditions. Use Value: Eliminates need for software semaphores or polling loops, reducing worst-case interrupt latency by >10 µs in safety-critical motion control loops. |
Use Scenario: A DSP processes streaming ADC data while an ARM host manages configuration and logging-both require low-latency access to shared filter coefficients and status registers. IC Role / Device Role / Timing Role: 71V321L25TFGI provides non-blocking dual-port access; INTL/INTR flags notify each processor of new parameter updates. Use Value: Enables zero-copy coefficient updates and status reporting with guaranteed atomicity-no data corruption during simultaneous read/write. |
| Redundant Communication Gateway | Avionics Data Concentrator Unit |
|
Use Scenario: Dual-channel Ethernet-to-CAN gateway where primary and backup processors maintain synchronized routing tables and link-state information. IC Role / Device Role / Timing Role: 71V321L25TFGI acts as fault-tolerant shared memory; BUSY logic ensures only one processor modifies table entries at a time. Use Value: Prevents inconsistent routing states during failover-guarantees table coherency even under transient power glitches affecting one channel. |
Use Scenario: Flight control computer aggregates sensor data from multiple redundant analog and digital sources before feeding flight management system. IC Role / Device Role / Timing Role: 71V321L25TFGI stores calibrated sensor offsets and health flags; battery backup preserves calibration during aircraft power-down. Use Value: Maintains sensor calibration integrity across maintenance cycles-eliminates pre-flight recalibration steps and reduces ground-time overhead. |
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, 3.3 V, 52-pin PLCC; no built-in BUSY logic-requires external arbitration | Larger word width suits 16-bit bus systems; lacks integrated interrupt/mailbox addressing | Select when 16-bit data path is required and external arbitration logic is acceptable |
| AS7C32098B-25TIN | 2K × 8, 25 ns, 3.3 V, 64-pin TQFP; no interrupt or BUSY outputs-pure dual-port SRAM | Simpler interface with identical pinout for basic dual-access needs; no arbitration or messaging features | Select when interprocessor signaling is handled entirely in software or external logic |
Compared with CY7C024AV-25AXC and AS7C32098B-25TIN, the 71V321L25TFGI uniquely integrates hardware arbitration and mailbox interrupts in a 2K × 8 footprint-reducing BOM count and eliminating timing-critical arbitration firmware.
Availability
71V321L25TFGI is available at Aetrix Electronics and suitable for industrial automation, avionics data concentrators, and redundant communication gateways requiring stable component supply, long-term lifecycle support, and verified industrial temperature performance.
Supply support for 71V321L25TFGI 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 71V321L25TFGI belongs to Renesas' legacy dual-port SRAM product line, designed specifically for deterministic interprocessor communication in real-time embedded systems requiring hardware-enforced memory coherency.
FAQ
What is the maximum operating frequency supported by the 71V321L25TFGI?
The 71V321L25TFGI does not operate on a clock; it is fully asynchronous. Its 25 ns access time (tAA) supports effective throughput up to ~40 MHz in tightly controlled read/write cycles. Timing is governed by tRC (read cycle time = 25 ns) and tWC (write cycle time = 25 ns), not a system clock. The 71V321L25TFGI achieves this performance using CMOS high-speed fabrication without requiring external clocking.
Does the 71V321L25TFGI require external pull-up resistors on BUSY or INT pins?
No. The 71V321L25TFGI features totem-pole outputs on BUSYL, BUSYR, INTL, and INTR-these pins drive both high and low actively and do not require external pull-ups. This eliminates BOM components and simplifies layout. The 71V321L25TFGI datasheet explicitly confirms totem-pole structure in Notes 1 and 2 of the Functional Block Diagram and Truth Tables.
How does the 71V321L25TFGI handle simultaneous access to the same memory location from both ports?
The 71V321L25TFGI uses address- and CE-based arbitration: if both ports assert CE and present identical A0–A10 addresses simultaneously, BUSYL and BUSYR go low to block writes on the "losing" port. Reads proceed unimpeded. The 71V321L25TFGI guarantees that one port wins deterministically-no bus contention or data corruption occurs. This behavior is defined in Table III (Address BUSY Arbitration) and Figure 3.
Can the 71V321L25TFGI retain data when powered only by a 2.0 V battery?
Yes. The 71V321L25TFGI supports true data retention at VCC = 2.0 V minimum, drawing ≤500 µA typical current (ICCDR). This is specified in Table 7 (Data Retention Characteristics) and enabled automatically when CE is deasserted and VCC drops below 3.0 V. The 71V321L25TFGI maintains all 2048 × 8 bits intact during main power loss-critical for avionics and industrial black-box recording.
Is the 71V321L25TFGI pin-compatible with other speed grades in the same package?
Yes. All 71V321L variants in the 64-pin TQFP (PPG64) package-including 71V321L25TFGI, 71V321L35TFGI, and 71V321L55TFGI-share identical pinouts and electrical interfaces. Only timing parameters differ: access time, cycle time, and setup/hold values scale with speed grade. This allows drop-in replacement for timing margin validation or cost optimization without PCB redesign.
71V321L25TFGI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 64-LQFP
- Packaging:
- Tray
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-TQFP (10x10)
71V321L25TFGI FAQ
1.How can I place an order for 71V321L25TFGI through Aetrix?
Please submit a Request for Quotation (RFQ) for 71V321L25TFGI 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 71V321L25TFGI reliable?
The price and inventory of 71V321L25TFGI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71V321L25TFGI is usually 5 days.
3.What payment methods are accepted for 71V321L25TFGI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71V321L25TFGI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71V321L25TFGI?
71V321L25TFGI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71V321L25TFGI 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 71V321L25TFGI?
For technical support, including 71V321L25TFGI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71V321L25TFGI requirements.
6.How does Aetrix verify that 71V321L25TFGI is sourced from the original manufacturer or authorized distributors?
All 71V321L25TFGI 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 71V321L25TFGI meets industry standards.
7.What is the process for return or replacement of 71V321L25TFGI?
All 71V321L25TFGI units undergo pre-shipment inspection (PSI). If there is an issue with 71V321L25TFGI, 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 71V321L25TFGI part is unused and in its original packaging.
Return procedure for 71V321L25TFGI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71V321L25TFGI Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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24LC01BT-I/OT
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M24C02-FMC6TG
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AT24CS02-SSHM-T
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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24LC01BT-I/SN
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24AA02UIDT-I/OT
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AT24C08C-STUM-T
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