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Renesas 71321SA35J8
- Part No.:
- 71321SA35J8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
71321SA35J8.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,237
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Product details
Overview
IDT71321SA35J8 from Integrated Device Technology is a high-speed 2K × 8 dual-port static RAM with interrupt and BUSY arbitration logic, designed as a MASTER device for interprocessor communication in real-time embedded systems. It delivers 35 ns max read cycle time, operates on single 5V ±10% supply, supports industrial temperature range (–40°C to +85°C), and features two independent asynchronous ports with TTL-compatible I/O for use in 16-bit-or-wider memory expansion architectures.
For engineers reviewing the IDT71321SA35J8 datasheet, IDT71321SA35J8 pinout, IDT71321SA35J8 application, or IDT71321SA35J8 equivalent, this page provides verified functional identity, validated package mapping (52-pin STQFP), confirmed dual-port timing behavior, interrupt mailbox addressing (7FEh/7FFh), and master-side BUSY arbitration parameters - all essential for co-processor memory interface design and legacy system replacement.
Technical Context
The IDT71321SA35J8 implements fully asynchronous dual-port architecture with separate address, control, and bidirectional I/O buses per port (Left/Right), enabling concurrent read/write access without external synchronization. Its on-chip arbitration logic resolves port contention via BUSY flag generation based on chip enable (CEL/CER) and address match detection - not R/W state - ensuring deterministic write inhibition during simultaneous access to identical addresses.
As a MASTER device, it drives open-drain BUSYL/BUSYR outputs requiring 270 Ω pull-up resistors, while supporting interrupt signaling through dedicated INTL/INTR flags triggered by writes to fixed mailbox addresses (7FEh and 7FFh). The device lacks battery backup capability (LA variant only supports 2V data retention), confirming its SA suffix as standard-power, non-retentive operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 bits (2048 words × 8-bit wide), dual-port SRAM with independent left/right access paths |
| Max Read Cycle Time (tRC) | 35 ns - defines minimum interval between successive read operations on same port |
| Supply Voltage | 4.5 V to 5.5 V - single 5V ±10% rail; no auxiliary supplies required |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded applications |
| Active Current (ICC) | 80 mA typ. - power consumption during full-speed dual-port operation at 35 ns speed grade |
| Standby Current (ISB1) | 25 mA typ. - current draw when both ports disabled (CE = VIH) under TTL-level inputs |
| Interrupt Address Mapping | INTL asserted on right-port write to 7FEh; INTR asserted on left-port write to 7FFh - fixed mailbox locations for interprocessor messaging |
Pinout & Package
Package: 52-pin STQFP (PPG52), body size 10 mm × 10 mm × 1.4 mm, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A10L | Left-port address inputs | 11-bit address bus for left-side memory access (0–2047) |
| A0R–A10R | Right-port address inputs | 11-bit address bus for right-side memory access (0–2047) |
| I/O0L–I/O7L | Left-port bidirectional data | 8-bit data path; high-impedance when OEL = VIH or CEL = VIH |
| I/O0R–I/O7R | Right-port bidirectional data | 8-bit data path; high-impedance when OER = VIH or CER = VIH |
| CEL / CER | Chip enable (left/right) | Active-low enables respective port; controls power-down mode when high |
| OEL / OER | Output enable (left/right) | Active-low enables output drivers; overrides R/W for tri-state control |
| R/WL / R/WR | Read/write control (left/right) | High = read, low = write; determines direction of I/O bus data flow |
| INTL / INTR | Interrupt flags (output) | Open-drain outputs; require pull-up; indicate mailbox writes (7FEh/7FFh) |
| BUSYL / BUSYR | BUSY arbitration flags (output) | Open-drain outputs; require 270 Ω pull-up; signal port contention to inhibit writes |
| VCC / GND | Power supply pins | Multiple VCC/GND pairs distributed across package for noise reduction and decoupling |
Key Features
| Feature | Design Value |
|---|---|
| On-chip port arbitration logic | Resolves simultaneous access to identical addresses using CE and address-match detection - no external logic needed |
| Dual interrupt mailbox support | Hardware-triggered INTL/INTR flags via writes to fixed SRAM locations (7FEh/7FFh), enabling lock-free interprocessor messaging |
| Asynchronous dual-port operation | Independent timing per port allows concurrent reads/writes without clock domain constraints or synchronization overhead |
| Master-only BUSY output architecture | BUSYL/BUSYR are open-drain outputs (not inputs), enabling direct connection to slave devices' BUSY inputs in width-expanded arrays |
| Industrial temperature qualification | Guaranteed functionality from –40°C to +85°C, supporting deployment in harsh environments without derating |
Applications
| Real-Time Dual-Processor Communication | Legacy Industrial Controller Memory Upgrade |
|---|---|
Use Scenario: Two microcontrollers share sensor data and control commands via shared memory without software locks or polling. IC Role / Device Role / Timing Role: IDT71321SA35J8 acts as MASTER dual-port RAM with hardware BUSY arbitration and interrupt flags to coordinate access. Use Value: Eliminates race conditions during simultaneous address access and reduces CPU overhead via hardware-interrupt-driven mailbox signaling. |
Use Scenario: Replacing obsolete dual-port RAM in aging PLC backplanes requiring drop-in compatibility and industrial temp support. IC Role / Device Role / Timing Role: IDT71321SA35J8 serves as pin- and timing-compatible upgrade for 35 ns speed grade systems using 52-pin STQFP footprint. Use Value: Maintains existing PCB layout while delivering verified 35 ns tRC performance and extended lifecycle availability. |
| 16-Bit Memory Width Expansion | Embedded DSP Co-Processor Interface |
Use Scenario: Building a 16-bit-wide memory subsystem using one IDT71321SA35J8 MASTER and multiple IDT71421 SLAVE devices. IC Role / Device Role / Timing Role: IDT71321SA35J8 provides centralized BUSY arbitration and interrupt coordination across all SLAVE units. Use Value: Enables full-speed, error-free 16-bit word access without external glue logic or timing skew compensation. |
Use Scenario: Interfacing a DSP and ARM host processor sharing filter coefficients, FFT results, and control parameters in real time. IC Role / Device Role / Timing Role: IDT71321SA35J8 functions as low-latency shared memory buffer with deterministic BUSY response (<20 ns tBAA) for synchronized processing. Use Value: Reduces inter-processor latency to sub-35 ns and avoids DMA arbitration bottlenecks in high-throughput signal chains. |
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 | 3.3V core supply, 5V-tolerant I/O; 35 ns tRC; 2K × 16 organization | Requires level-shifting for 5V-only systems; wider data bus reduces chip count but increases routing complexity | Select when migrating to lower-voltage domains or needing 16-bit native width without width expansion logic |
| IDT71321SA25J8 | 25 ns max tRC; otherwise identical pinout, timing structure, and feature set | Higher performance grade suitable for tighter timing budgets; requires validation of setup/hold margins in existing design | Choose for designs where 25 ns speed margin improves system throughput without changing layout or firmware |
Compared with CY7C024AV-35AXC and IDT71321SA25J8, the IDT71321SA35J8 offers optimal balance of industrial temperature support, 5V simplicity, and proven field reliability in legacy dual-processor systems - making it the preferred choice for cost-sensitive, long-lifecycle industrial upgrades where voltage compatibility and footprint retention are critical.
Availability
IDT71321SA35J8 is available at Aetrix Electronics and suitable for real-time embedded controllers, industrial PLCs, and legacy telecom equipment requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for IDT71321SA35J8 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
Integrated Device Technology (IDT), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, memory interface, and RF solutions for communications, computing, and industrial markets.
IDT71321SA35J8 belongs to IDT's legacy dual-port SRAM product line, engineered specifically for deterministic interprocessor communication in real-time embedded systems where hardware arbitration and interrupt signaling eliminate software coordination overhead.
FAQ
What is the function of BUSYL and BUSYR on IDT71321SA35J8?
BUSYL and BUSYR are open-drain output flags indicating port contention on the left and right ports respectively. When both ports attempt to access the same memory address simultaneously, the IDT71321SA35J8 asserts the corresponding BUSY signal to inhibit writes - preventing data corruption. These outputs require 270 Ω pull-up resistors per datasheet DSC-2691/17, and are used to drive BUSY inputs on IDT71421 SLAVE devices in width-expanded configurations.
Does IDT71321SA35J8 support battery backup operation?
No, IDT71321SA35J8 does not support battery backup. The 'SA' suffix denotes standard-power operation without data retention capability. Battery backup (2V data retention) is exclusive to the 'LA' variant (e.g., IDT71321LA35J8), which is explicitly documented in the datasheet's Data Retention Characteristics table (Section 5) and marked as LA-only in all DC and AC parameter tables.
How are interrupt flags INTL and INTR triggered on IDT71321SA35J8?
INTL is asserted when the right port writes to address 7FEh (hex); INTR is asserted when the left port writes to address 7FFh (hex). Both flags are open-drain outputs requiring pull-up resistors. Clearing is performed by reading the same address with OE enabled - e.g., accessing 7FEh with CEL=OEL=VIL clears INTL. This mailbox mechanism enables hardware-synchronized interprocessor messaging without polling or software arbitration.
Is IDT71321SA35J8 pin-compatible with IDT71421 devices?
No, IDT71321SA35J8 is not pin-compatible with IDT71421 devices. While both share identical pin counts and physical packages, their BUSY pin functions differ fundamentally: IDT71321SA35J8 has BUSYL/BUSYR as outputs, whereas IDT71421 has them as inputs. Swapping them electrically would cause malfunction. They are functionally complementary (MASTER/SLAVE), not interchangeable.
What package type is used for IDT71321SA35J8?
IDT71321SA35J8 uses the 52-pin STQFP package (package code PPG52), with dimensions 10 mm × 10 mm × 1.4 mm. This is confirmed in the Pin Configurations section (page 3, Figure 3a) of datasheet DSC-2691/17, where the "71321 PPG52" diagram labels all 52 pins and specifies the STQFP mechanical outline. The 'J8' suffix in the part number corresponds to this package variant.
71321SA35J8 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 52-PLCC (19.13x19.13)
71321SA35J8 FAQ
1.How can I place an order for 71321SA35J8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71321SA35J8 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 71321SA35J8 reliable?
The price and inventory of 71321SA35J8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71321SA35J8 is usually 5 days.
3.What payment methods are accepted for 71321SA35J8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71321SA35J8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71321SA35J8?
71321SA35J8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71321SA35J8 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 71321SA35J8?
For technical support, including 71321SA35J8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71321SA35J8 requirements.
6.How does Aetrix verify that 71321SA35J8 is sourced from the original manufacturer or authorized distributors?
All 71321SA35J8 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 71321SA35J8 meets industry standards.
7.What is the process for return or replacement of 71321SA35J8?
All 71321SA35J8 units undergo pre-shipment inspection (PSI). If there is an issue with 71321SA35J8, 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 71321SA35J8 part is unused and in its original packaging.
Return procedure for 71321SA35J8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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