My Inquiry
My Account
Renesas 71V321L35JG8
- Part No.:
- 71V321L35JG8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
71V321L35JG8.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,173
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
71V321L35JG8 from Renesas Electronics is a high-speed, 3.3V, 2K × 8 dual-port static RAM with interrupt logic and BUSY arbitration for interprocessor communication. It features 35 ns max access time, 1 mW typical standby power, battery-backed data retention down to 2 V, and operates across commercial temperature range (0°C to +70°C) in a 52-pin PLCC package. It is used in real-time embedded systems requiring concurrent memory access by two independent processors or controllers.
For engineers reviewing the 71V321L35JG8 datasheet, 71V321L35JG8 pinout, 71V321L35JG8 application, or 71V321L35JG8 equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative parts - all grounded in the official IDT/Renesas datasheet DSC-3026/14 (July 2019).
Technical Context
The 71V321L35JG8 implements fully asynchronous dual-port architecture with independent left/right address, control, and I/O buses. Its on-chip arbitration logic uses address and chip-enable matching to assert BUSYL/BUSYR outputs, preventing simultaneous writes to the same location without external logic.
Interrupt functionality is implemented via dedicated mailbox addresses (7FEH for INTL, 7FFH for INTR), where write operations from one port set the opposite port's interrupt flag. The device supports TTL-compatible signaling and automatic power-down per port via CE-driven standby modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 (16,384 bits), fully random-access SRAM array |
| Access Time (max) | 35 ns - guarantees worst-case read/write cycle timing under commercial conditions (VCC = 3.3 V ± 0.3 V, TA = 0°C to +70°C) |
| Supply Voltage | 3.0 V to 3.6 V - single 3.3 V nominal rail; no separate I/O or core voltage required |
| Standby Current (typ) | 1 mW (≈300 µA at 3.3 V) - enables ultra-low-power hold mode during processor idle |
| Data Retention | 2 V minimum VCC - retains memory contents during brown-out or battery backup operation |
| Operating Temperature | 0°C to +70°C - commercial-grade qualification; not rated for industrial range in this speed/package variant |
| Package | 52-pin PLCC (PLG52) - surface-mount, leaded, JEDEC-standard footprint with 0.050" lead pitch |
Pinout & Package
71V321L35JG8 is housed in a 52-pin Plastic Leaded Chip Carrier (PLCC, package code PLG52), with leads arranged in a square J-lead configuration. Pin 1 is marked by a corner notch; the package body measures approximately 0.75" × 0.75" × 0.17".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A10L | Left port address inputs | 11-bit address bus for left-side memory access (2K = 211) |
| A0R–A10R | Right port address inputs | Independent 11-bit address bus enabling concurrent addressing on right port |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit parallel data path; direction controlled by R/WL and OEL |
| I/O0R–I/O7R | Right port bidirectional data | Electrically isolated 8-bit data path; no internal bus contention |
| CEL / CER | Chip enable (left/right) | Active-low enables respective port; drives internal power-down when high |
| OEL / OER | Output enable (left/right) | Active-low controls tri-state output drivers on corresponding I/O bus |
| R/WL / R/WR | Read/write control (left/right) | Active-low write signal; high = read, low = write (TTL-compatible levels) |
| INTL / INTR | Interrupt flags (output) | Open-drain compatible (totem-pole); asserted low upon mailbox write (7FEH/7FFH) |
| BUSYL / BUSYR | Arbitration busy flags (output) | Totem-pole outputs; go low when opposite port accesses same address - blocks write execution |
| VCC | Power supply | 3.3 V main supply; all VCC pins must be connected to decoupled 3.3 V rail |
| GND | Ground reference | Common return; multiple GND pins require low-inductance PCB connection |
Key Features
| Feature | Design Value |
|---|---|
| Dual-port arbitration with BUSY outputs | Hardware-enforced conflict resolution: BUSYL/BUSYR assert within 20 ns of address match, blocking invalid writes without software overhead |
| Port-to-port interrupt mailbox | Two dedicated SRAM locations (7FEH, 7FFH) serve as hardware-triggered message flags - eliminates polling and reduces inter-processor latency |
| Low-power standby mode | 1 mW typical consumption (≈300 µA @ 3.3 V) when both ports disabled - suitable for battery-backed systems with infrequent access |
| 2 V data retention | Preserves full memory contents during brown-out or backup-battery operation - critical for fault-tolerant control state storage |
| Asynchronous operation | No clock required; each port operates independently with its own CE/OE/RW timing - simplifies integration with heterogeneous processors |
Applications
| Industrial PLC Dual-CPU Architecture | Avionics Data Concentrator Unit |
|---|---|
|
Use Scenario: Two independent CPUs (control + monitoring) share sensor/actuator status in real time without shared bus arbitration overhead. IC Role / Device Role / Timing Role: 71V321L35JG8 serves as non-blocking shared memory buffer with hardware BUSY signaling to serialize conflicting writes. Use Value: Eliminates software mutexes and reduces inter-CPU latency to ≤35 ns - enabling deterministic response in safety-critical motion control loops. |
Use Scenario: Flight management system (FMS) and display processor exchange telemetry and configuration data via mailbox protocol. IC Role / Device Role / Timing Role: 71V321L35JG8 acts as interrupt-driven message-passing interface, using INTL/INTR flags to notify data readiness. Use Value: Reduces CPU polling load by >90% and ensures sub-millisecond notification of new navigation updates. |
| Medical Imaging Real-Time Buffer | Telecom Baseband Processor Pair |
|
Use Scenario: Image acquisition engine and reconstruction processor concurrently access frame buffers during MRI scan sequences. IC Role / Device Role / Timing Role: 71V321L35JG8 provides zero-wait-state dual-port access to 16 KB of pixel metadata and calibration tables. Use Value: Enables continuous 120 MB/s data streaming without pipeline stalls - sustaining real-time image reconstruction throughput. |
Use Scenario: Modem and DSP cores in 4G/LTE baseband ICs exchange channel estimation results and symbol buffers. IC Role / Device Role / Timing Role: 71V321L35JG8 functions as low-latency inter-core scratchpad with BUSY arbitration preventing corrupted FFT coefficient writes. Use Value: Guarantees atomic update of time-critical radio parameters - avoiding bit errors caused by partial writes during handover events. |
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 | 35 ns access, 2K × 16 organization, 3.3 V, 68-pin TSSOP - double data width but larger footprint and no built-in BUSY logic | Requires external arbitration circuitry for conflict detection; better suited for wider-data pipelines than strict 8-bit dual-CPU sync | Select when 16-bit data path or TSSOP mounting is preferred; verify external BUSY implementation matches system timing budget |
| AS7C3256B-35JCIN | 35 ns access, 32K × 8 organization, 3.3 V, 44-pin SOJ - higher density, no interrupt flags, no BUSY outputs | Lacks hardware inter-processor signaling; relies on software-managed semaphores or external logic for coordination | Choose for cost-sensitive, non-real-time applications where mailbox/interrupt features are unnecessary and density is prioritized |
Compared with CY7C024AV-35AXC and AS7C3256B-35JCIN, the 71V321L35JG8 uniquely integrates BUSY arbitration and interrupt mailbox logic in a compact 52-pin PLCC - reducing BOM count and PCB area while guaranteeing deterministic inter-processor synchronization without firmware intervention.
Availability
71V321L35JG8 is available at Aetrix Electronics and suitable for industrial PLCs, avionics data concentrators, and medical imaging systems requiring stable component supply, long-lifecycle support, and guaranteed commercial-temperature performance.
Supply support for 71V321L35JG8 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 71V321L series was originally developed by Integrated Device Technology (IDT) and acquired by Renesas in 2019; it targets real-time embedded systems requiring deterministic, low-latency dual-processor memory sharing without external arbitration logic.
FAQ
What is the maximum operating temperature range supported by the 71V321L35JG8?
The 71V321L35JG8 is qualified for commercial temperature range only: 0°C to +70°C. Although the datasheet notes industrial variants exist for other speed/package combinations (e.g., 71V321L35JGI8), the JG8 suffix explicitly denotes commercial grade - confirmed by the Orderable Part Information table on page 14 of DSC-3026/14.
Does the 71V321L35JG8 require external pull-up resistors on BUSY or INT pins?
No. The 71V321L35JG8 features totem-pole output drivers on BUSYL, BUSYR, INTL, and INTR pins - explicitly stated in Note 2 of the Functional Block Diagram and Table III. These outputs drive actively high/low and do not require external pull-ups for proper logic-level operation.
How does the 71V321L35JG8 handle simultaneous access to the same memory address from both ports?
When both ports attempt access to identical addresses, the 71V321L35JG8 asserts the BUSY flag (BUSYL or BUSYR) on the later-arriving port within ≤30 ns. That port's write is internally gated and ignored; reads return valid data only after tBDD delay (≤45 ns). This hardware arbitration prevents data corruption without software intervention.
Can the 71V321L35JG8 operate from a 2.5 V supply?
No. The 71V321L35JG8 is specified strictly for 3.3 V operation: VCC min = 3.0 V, max = 3.6 V per DC Electrical Characteristics (Table 3026 tbl 03). Operation below 3.0 V violates recommended conditions and risks data retention failure or timing violations - even though 2 V is supported only for battery backup mode, not active operation.
What is the function of address locations 7FEH and 7FFH in the 71V321L35JG8?
In the 71V321L35JG8, address 7FEH serves as the left-port interrupt mailbox: a write from the right port sets INTL; a read from the left port clears it. Address 7FFH serves as the right-port mailbox: right-port reads clear INTR, left-port writes set it - enabling hardware-synchronized message passing without polling.
71V321L35JG8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 52-LCC (J-Lead)
- 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:
- 35ns
- Access Time:
- 35 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)
71V321L35JG8 FAQ
1.How can I place an order for 71V321L35JG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71V321L35JG8 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 71V321L35JG8 reliable?
The price and inventory of 71V321L35JG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71V321L35JG8 is usually 5 days.
3.What payment methods are accepted for 71V321L35JG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71V321L35JG8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71V321L35JG8?
71V321L35JG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71V321L35JG8 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 71V321L35JG8?
For technical support, including 71V321L35JG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71V321L35JG8 requirements.
6.How does Aetrix verify that 71V321L35JG8 is sourced from the original manufacturer or authorized distributors?
All 71V321L35JG8 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 71V321L35JG8 meets industry standards.
7.What is the process for return or replacement of 71V321L35JG8?
All 71V321L35JG8 units undergo pre-shipment inspection (PSI). If there is an issue with 71V321L35JG8, 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 71V321L35JG8 part is unused and in its original packaging.
Return procedure for 71V321L35JG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71V321L35JG8 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…
