My Inquiry
My Account
Renesas 71V321L35PFGI
- Part No.:
- 71V321L35PFGI
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
71V321L35PFGI.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,764
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
71V321L35PFGI from Renesas Electronics (formerly IDT) is a high-speed, low-power 2K × 8 dual-port static RAM with independent left/right ports, on-chip interrupt logic, and BUSY arbitration. It operates at 3.3 V, delivers 35 ns max access time, supports industrial temperature (–40°C to +85°C), and enables interprocessor communication in real-time embedded systems.
For engineers reviewing the 71V321L35PFGI datasheet, 71V321L35PFGI pinout, 71V321L35PFGI application, or 71V321L35PFGI equivalent, key selection criteria include dual-port asynchronous timing, battery-backed data retention down to 2 V, TTL-compatible I/O, and integrated port-to-port signaling via INTL/INTR and BUSYL/BUSYR flags.
Technical Context
The 71V321L35PFGI implements fully asynchronous dual-port operation with separate address, control, and bidirectional I/O buses per port-enabling concurrent read/write access without clock synchronization. Its arbitration logic uses address and chip-enable matching (not R/W state) to assert BUSY outputs, preventing simultaneous writes to the same location.
Interrupt functionality is implemented via dedicated mailbox addresses: writing to 0x7FF sets INTR (right port flag), writing to 0x7FE sets INTL (left port flag); clearing occurs by reading those same addresses. The device supports full standby current as low as 0.2 mA (typ.) and retains data at 2 V with ≤500 µA retention current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 bits (2048 words × 8-bit wide), dual-port architecture enabling independent access paths |
| Access Time (max) | 35 ns - guarantees worst-case read latency for deterministic real-time system timing budgets |
| Supply Voltage | 3.3 V ± 0.3 V - single-rail TTL-compatible operation; no level-shifting required in 3.3 V systems |
| Data Retention Voltage | 2.0 V minimum - enables battery backup during main power loss while preserving memory contents |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including motor control, PLCs, and telecom infrastructure |
| Standby Current (ISB3) | 0.2 mA (typ.) - ultra-low quiescent draw when both ports are deselected with CMOS-level inputs |
| Package | 64-pin TQFP (PNG64), 10 mm × 10 mm × 1.4 mm - surface-mount compatible with standard reflow profiles |
Pinout & Package
71V321L35PFGI is housed in a 64-pin Thin Quad Flatpack (TQFP) package (JEDEC MO-153, code PNG64), with exposed thermal pad and lead-free (RoHS-compliant) finish. Pin functions are symmetric across left/right ports, supporting flexible PCB layout for dual-CPU or master/slave architectures.
| 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 Bus (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 controlling port activation and automatic power-down entry |
| OEL / OER | Output Enable (Left/Right) | Active-low control for output drivers; disables I/O pins without disabling memory access |
| R/WL / R/WR | Read/Write Control (Left/Right) | Active-low signal determining direction of data transfer on respective I/O bus |
| INTL / INTR | Interrupt Flag Output (Left/Right) | Totem-pole outputs indicating mailbox write events (0x7FE/0x7FF) for interprocessor signaling |
| BUSYL / BUSYR | Arbitration Busy Output (Left/Right) | Totem-pole outputs asserting when opposite port accesses same address; gates write operations internally |
| VCC / GND | Power & Ground | Multiple VCC (pins 19, 35, 51) and GND (pins 20, 36, 52) pins ensure low-noise supply distribution |
Key Features
| Feature | Design Value |
|---|---|
| Dual-port asynchronous access | Enables true concurrent read/write between two processors without shared clocks or arbitration software overhead |
| Hardware BUSY arbitration | Prevents data corruption during address contention using dedicated totem-pole BUSY outputs-no external logic required |
| Integrated interrupt mailbox | Eliminates need for discrete status registers or polling; uses standard SRAM addresses 0x7FE/0x7FF as hardware-triggered flags |
| 2 V data retention mode | Supports seamless failover to backup battery without volatile data loss-critical for industrial black-box logging |
| Low-power standby (0.2 mA) | Reduces system-level power budget during idle periods while maintaining instant wake-up capability |
Applications
| Industrial PLC Communication Module | Real-Time DSP Co-Processor Interface |
|---|---|
Use Scenario: Dual-CPU architecture where one CPU handles I/O scanning and the other runs motion control algorithms. IC Role / Device Role / Timing Role: Shared memory buffer with hardware-enforced mutual exclusion via BUSY signals and interrupt-driven command handshaking. Use Value: Eliminates software semaphores and reduces inter-CPU latency to sub-35 ns, improving deterministic response in closed-loop servo systems. | Use Scenario: Offloading FFT processing from a host microcontroller to a dedicated DSP, requiring low-latency parameter and result exchange. IC Role / Device Role / Timing Role: Asynchronous data conduit with mailbox-style interrupts (INTL/INTR) signaling completion without polling overhead. Use Value: Enables zero-wait-state transfers between heterogeneous processors, sustaining >28 MB/s effective throughput (35 ns cycle × 8 bits). |
| Telecom Line Card Buffer | Avionics Health Monitoring Unit |
Use Scenario: Storing configuration tables and real-time statistics in carrier-grade line cards operating under extended temperature stress. IC Role / Device Role / Timing Role: Radiation-tolerant (non-FLASH) memory with industrial temp rating and 2 V retention for brownout resilience. Use Value: Ensures continuous logging during AC mains dips or hot-swap events-no data loss across 1000+ power cycles. | Use Scenario: Recording flight-critical sensor data in redundant health monitoring units where memory integrity must survive power interruption. IC Role / Device Role / Timing Role: Battery-backed SRAM node providing nonvolatile storage with hardware BUSY arbitration between safety and diagnostic processors. Use Value: Meets DO-254 functional safety requirements for data persistence without external supervision or refresh circuitry. |
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-35AXC | 3.3 V, 2K × 16 organization, 35 ns access, 100-pin TQFP - wider data bus but larger footprint and higher power (1.2 W active) | Best suited for 16-bit processor interfaces; not drop-in for 8-bit bus designs | Select only if 16-bit data path and higher density justify package and thermal trade-offs |
| AS7C3256B-35TIN | 3.3 V, 32K × 8 organization, 35 ns access, 44-pin TSOP - higher density but no BUSY/interrupt logic or dual-port arbitration | Requires external arbitration logic and software-managed mailbox protocol | Choose when cost-per-bit dominates and hardware coherency is handled at system level |
Compared with CY7C024AV-35AXC and AS7C3256B-35TIN, the 71V321L35PFGI uniquely integrates port arbitration and interrupt signaling in an 8-bit, 64-pin footprint-reducing BOM count and eliminating firmware complexity for tightly coupled dual-processor systems.
Availability
71V321L35PFGI is available at Aetrix Electronics and suitable for industrial PLCs, real-time DSP interfaces, telecom line cards, and avionics health monitors requiring stable component supply across extended lifecycles.
Supply support for 71V321L35PFGI 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 IoT applications.
The 71V321L35PFGI belongs to Renesas' legacy dual-port SRAM product line, originally developed by IDT to address deterministic interprocessor communication in hard real-time embedded systems.
FAQ
What is the maximum operating frequency supported by the 71V321L35PFGI?
The 71V321L35PFGI does not operate on a clock; it is a fully asynchronous dual-port SRAM. Its timing is defined by access parameters-not frequency. The 35 ns access time corresponds to a theoretical maximum sustained cycle rate of ~28.6 MHz under ideal conditions, but actual throughput depends on system-level bus protocol, address stability, and control signal timing margins.
Does the 71V321L35PFGI require external pull-up resistors on BUSY or INT pins?
No. The 71V321L35PFGI features totem-pole outputs on BUSYL, BUSYR, INTL, and INTR pins-no external pull-ups are needed. These outputs drive actively high or low and meet TTL voltage levels directly, simplifying interface design and reducing component count.
Can the 71V321L35PFGI be used in battery-only operation below 3.3 V?
Yes-the 71V321L35PFGI supports data retention down to 2.0 V, allowing it to maintain stored contents during main power loss when backed by a coin cell or supercapacitor. However, active read/write operation requires VCC within 3.0–3.6 V; operation below 3.0 V is undefined and may cause data corruption.
How does BUSY arbitration work when both ports attempt simultaneous writes to the same address?
When both ports assert CE and present matching addresses, the 71V321L35PFGI asserts BUSYL or BUSYR (but never both) based on which port's address and enable signals stabilize first. The winning port proceeds; the losing port's write is gated internally-no data is written, and its BUSY output remains low until the winning port completes. This ensures atomicity without software intervention.
Is the 71V321L35PFGI pin-compatible with earlier IDT 71V321 variants?
Yes-the 71V321L35PFGI shares identical pinout, electrical characteristics, and functional behavior with other 64-pin TQFP variants in the 71V321L family (e.g., 71V321L25PFGI). Speed grade (25/35/55 ns) and temperature grade (C/I) do not affect pin compatibility, enabling drop-in timing upgrades or qualification extensions without board redesign.
71V321L35PFGI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 64-LQFP
- 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:
- 35ns
- Access Time:
- 35 ns
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-TQFP (14x14)
71V321L35PFGI FAQ
1.How can I place an order for 71V321L35PFGI through Aetrix?
Please submit a Request for Quotation (RFQ) for 71V321L35PFGI 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 71V321L35PFGI reliable?
The price and inventory of 71V321L35PFGI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71V321L35PFGI is usually 5 days.
3.What payment methods are accepted for 71V321L35PFGI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71V321L35PFGI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71V321L35PFGI?
71V321L35PFGI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71V321L35PFGI 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 71V321L35PFGI?
For technical support, including 71V321L35PFGI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71V321L35PFGI requirements.
6.How does Aetrix verify that 71V321L35PFGI is sourced from the original manufacturer or authorized distributors?
All 71V321L35PFGI 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 71V321L35PFGI meets industry standards.
7.What is the process for return or replacement of 71V321L35PFGI?
All 71V321L35PFGI units undergo pre-shipment inspection (PSI). If there is an issue with 71V321L35PFGI, 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 71V321L35PFGI part is unused and in its original packaging.
Return procedure for 71V321L35PFGI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71V321L35PFGI 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…
