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Renesas 71321SA55JG8
- Part No.:
- 71321SA55JG8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
71321SA55JG8.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:940
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Product details
Overview
IDT71321SA55JG8 from Integrated Device Technology is a high-speed 2K × 8 dual-port static RAM with interrupt logic and on-chip arbitration, designed as a MASTER device for interprocessor communication. It features 55 ns max access time, TTL-compatible 5 V ±10% operation, industrial temperature range (–40°C to +85°C), and dual independent ports enabling fully asynchronous read/write access to shared memory. It is used in real-time embedded systems requiring deterministic port-to-port handshaking, such as motor control co-processor interfaces.
For engineers reviewing the IDT71321SA55JG8 datasheet, IDT71321SA55JG8 pinout, IDT71321SA55JG8 application, or IDT71321SA55JG8 equivalent, this page delivers verified specifications, validated pin functions, confirmed interrupt timing behavior, BUSY arbitration logic constraints, and direct alternative part comparisons - all grounded in the official IDT DSC-2691/17 datasheet.
Technical Context
The IDT71321SA55JG8 implements hardware-based port arbitration using CE and address-match detection (tAPS = 5 ns), asserting open-drain BUSY outputs to block concurrent writes to identical addresses. Its interrupt logic uses dedicated mailbox addresses (7FEH for INTL, 7FFH for INTR) with tINS ≤ 45 ns and tINR ≤ 45 ns timing.
It supports two distinct operational modes: standalone 8-bit dual-port operation or MASTER in MASTER/SLAVE width-expansion configurations (e.g., with IDT71421). The device requires external 270 Ω pull-up resistors on BUSY and INT pins and enters low-power standby (ISB3 ≤ 1.0 mA) when both CE inputs are deasserted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 bits (2048 words × 8 data lines), fully random-access dual-port SRAM |
| Max Access Time | 55 ns - defines minimum read cycle time (tRC) for worst-case industrial-temp operation |
| Supply Voltage | 4.5 V to 5.5 V - requires single 5 V ±10% rail; all VCC pins must be connected |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded applications |
| Interrupt Timing | tINS ≤ 45 ns, tINR ≤ 45 ns - sets maximum latency for mailbox flag assertion/clearing |
| BUSY Arbitration | tBAA/tBAC ≤ 30 ns, tBDD ≤ 50 ns - determines earliest valid data availability after contention resolution |
| Standby Current | ISB3 ≤ 1.0 mA (full CMOS standby) - enables ultra-low-power hold mode during system sleep |
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; latched on CEL or R/WL transition |
| A0R–A10R | Right port address inputs | 11-bit address bus for right-side memory access; independent timing from left port |
| I/O0L–I/O7L | Left port bidirectional data I/O | 8-bit data path; direction controlled by R/WL; high-impedance when OEL = VIH or CEL = VIH |
| I/O0R–I/O7R | Right port bidirectional data I/O | 8-bit data path; direction controlled by R/WR; high-impedance when OER = VIH or CER = VIH |
| CEL, CER | Chip enable inputs (active low) | Gate power-down per port; ISB1/ISB2/ISB3/ISB4 current states depend on CE logic levels |
| OEL, OER | Output enable inputs (active low) | Control I/O drivers only; do not affect internal memory access or power state |
| R/WL, R/WR | Read/write control (active low) | Determine data direction on respective I/O buses; write pulse width tWP ≥ 30 ns required |
| INTL, INTR | Open-drain interrupt flags | Asserted low on mailbox write (7FEH/7FFH); require external pull-up (270 Ω) |
| BUSYL, BUSYR | Open-drain BUSY signals | BUSYL/BUSYR are outputs on IDT71321SA55JG8; indicate port contention; require 270 Ω pull-up |
| VCC, GND | Power supply terminals | Multiple VCC/GND pins - all must be connected to maintain signal integrity and thermal performance |
Key Features
| Feature | Design Value |
|---|---|
| On-chip port arbitration logic | Eliminates need for external glue logic in MASTER/SLAVE width-expansion systems (e.g., 16-bit bus) |
| Dual independent interrupt mailboxes | Hardware-accelerated interprocessor signaling via dedicated 7FEH/7FFH SRAM locations |
| Open-drain BUSY outputs with timing control | Enables deterministic write-inhibit behavior across ports; tBDD ≤ 50 ns ensures predictable data validity window |
| Full asynchronous dual-port operation | Permits simultaneous, independent read/write access from left and right ports without clock synchronization |
| Industrial-grade power management | ISB3 ≤ 1.0 mA full standby current enables battery-backed retention-ready designs (though LA variant required for 2V retention) |
Applications
| Motor Control Co-Processor Interface | Real-Time Data Acquisition Buffer |
|---|---|
Use Scenario: Dual-core MCU architecture where one core handles motion trajectory calculation and the other manages PWM generation and feedback sampling. IC Role / Device Role / Timing Role: IDT71321SA55JG8 acts as MASTER dual-port RAM, synchronizing position setpoints and sensor readings between cores via BUSY arbitration and INTL/INTR flags. Use Value: Eliminates software polling or OS-level semaphores; guarantees sub-50 ns contention resolution and deterministic 45 ns interrupt latency for closed-loop response. |
Use Scenario: High-speed analog front-end digitizing at 1 MSPS, buffering samples before DMA transfer to host processor. IC Role / Device Role / Timing Role: IDT71321SA55JG8 provides non-blocking dual-port access: ADC controller writes to left port while host reads from right port. Use Value: Prevents sample loss during burst reads; 55 ns access enables sustained 18.2 MB/s throughput per port without FIFO overflow. |
| Industrial PLC Communication Gateway | Redundant Safety Controller Memory |
Use Scenario: Gateway bridging Modbus RTU fieldbus and EtherCAT network, requiring deterministic message passing between protocol stacks. IC Role / Device Role / Timing Role: IDT71321SA55JG8 serves as shared mailbox with interrupt-driven event notification between protocol task threads running on separate CPUs. Use Value: Reduces inter-CPU latency to ≤45 ns for safety-critical status updates; eliminates race conditions via hardware BUSY arbitration. |
Use Scenario: SIL-3 certified safety controller with primary and backup processing units monitoring shared diagnostic state. IC Role / Device Role / Timing Role: IDT71321SA55JG8 operates as MASTER in lockstep configuration, ensuring atomic write visibility and synchronized fault flag propagation. Use Value: Guarantees consistent memory image across redundant channels; tAPS = 5 ns prevents arbitration ambiguity during failover transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Cypress CY7C1371DV33-166AXC | 166 MHz (6 ns) DDR interface, 3.3 V supply, no native BUSY arbitration logic | Requires external logic for port contention handling; suited for high-throughput streaming, not deterministic interprocessor comms | Select only if bandwidth > 100 MB/s is required and arbitration can be implemented in FPGA or software |
| Renesas R1EX24064ASAS0I#U0 | 64 K × 8, 70 ns access, 5 V, but single-port with I²C interface and no interrupt/BUSY features | Lacks dual-port concurrency and hardware handshaking - unsuitable for real-time co-processor coordination | Consider only for non-concurrent buffer storage where interrupt latency and arbitration are irrelevant |
Compared with CY7C1371DV33-166AXC and R1EX24064ASAS0I#U0, IDT71321SA55JG8 uniquely integrates hardware BUSY arbitration and dual interrupt mailboxes within a 55 ns industrial-grade dual-port SRAM - making it irreplaceable for deterministic, low-latency interprocessor communication without external logic.
Availability
IDT71321SA55JG8 is available at Aetrix Electronics and suitable for motor control co-processors, real-time data acquisition buffers, and industrial PLC communication gateways requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.
Supply support for IDT71321SA55JG8 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 power solutions for communications and industrial markets.
IDT71321SA55JG8 belongs to the IDT71321/71421 dual-port SRAM product line, engineered specifically for deterministic interprocessor communication in real-time embedded systems requiring hardware-enforced arbitration and interrupt-driven mailbox semantics.
FAQ
What is the maximum operating temperature range for IDT71321SA55JG8?
IDT71321SA55JG8 is rated for industrial temperature operation from –40°C to +85°C, as confirmed in the DSC-2691/17 datasheet Section 2 ("Recommended Operating Temperature and Supply Voltage"). This rating applies specifically to the SA speed grade with 55 ns access time and is validated across all supported packages including PPG52.
Does IDT71321SA55JG8 support battery backup data retention?
No, IDT71321SA55JG8 does not support battery backup data retention. That feature is exclusive to the LA variant (e.g., IDT71321LA55JG8), which specifies VDR = 2.0 V and ICCDR ≤ 4000 µA under industrial conditions. The SA suffix denotes standard active power consumption (ICC ≤ 65 mA) without low-voltage retention capability.
How are BUSY signals used on IDT71321SA55JG8?
On IDT71321SA55JG8, BUSYL and BUSYR are open-drain outputs that assert low when port contention is detected on the corresponding port. They require 270 Ω external pull-up resistors per the datasheet Note 2. These signals directly inhibit writes on the contending port and are essential for MASTER/SLAVE width-expansion configurations with IDT71421 devices.
What are the interrupt mailbox addresses for IDT71321SA55JG8?
IDT71321SA55JG8 uses fixed SRAM addresses for interrupt signaling: writing to address 7FEH (2046dec) asserts the left-port interrupt flag (INTL), and writing to address 7FFH (2047dec) asserts the right-port interrupt flag (INTR). Clearing is performed by reading those same addresses with appropriate CE/OE control, as defined in Truth Table II of the datasheet.
Is IDT71321SA55JG8 pin-compatible with IDT71421 devices?
No, IDT71321SA55JG8 is not pin-compatible with IDT71421 devices. While both share identical pin counts and package footprints (e.g., PPG52), their BUSY pin roles differ fundamentally: BUSYL/BUSYR are outputs on IDT71321SA55JG8 but inputs on IDT71421. Swapping them without redesigning the BUSY routing and pull-up logic will cause functional failure.
71321SA55JG8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 52-LCC (J-Lead)
- 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:
- 55ns
- Access Time:
- 55 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)
71321SA55JG8 FAQ
1.How can I place an order for 71321SA55JG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71321SA55JG8 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 71321SA55JG8 reliable?
The price and inventory of 71321SA55JG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71321SA55JG8 is usually 5 days.
3.What payment methods are accepted for 71321SA55JG8?
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4.How is shipping managed for 71321SA55JG8?
71321SA55JG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71321SA55JG8 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 71321SA55JG8?
For technical support, including 71321SA55JG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71321SA55JG8 requirements.
6.How does Aetrix verify that 71321SA55JG8 is sourced from the original manufacturer or authorized distributors?
All 71321SA55JG8 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 71321SA55JG8 meets industry standards.
7.What is the process for return or replacement of 71321SA55JG8?
All 71321SA55JG8 units undergo pre-shipment inspection (PSI). If there is an issue with 71321SA55JG8, 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 71321SA55JG8 part is unused and in its original packaging.
Return procedure for 71321SA55JG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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