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Renesas 71321LA25JGI
- Part No.:
- 71321LA25JGI
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
71321LA25JGI.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:220
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Product details
Overview
IDT71321LA25JGI from Integrated Device Technology (IDT) 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 features 25 ns max access time, industrial temperature range (–40°C to +85°C), 5 V ±10% supply, battery-backed data retention at 2 V, and 52-pin STQFP package.
For engineers reviewing the IDT71321LA25JGI datasheet, IDT71321LA25JGI pinout, IDT71321LA25JGI application, or IDT71321LA25JGI equivalent, key selection criteria include dual-port asynchronous read/write timing, MASTER/SLAVE expandability, INTL/INTR mailbox addressing (7FEh/7FFh), BUSY output behavior, and low-power standby current (1 µA typical full standby).
Technical Context
The IDT71321LA25JGI implements fully asynchronous dual-port operation with independent left/right address, control, and I/O buses. Its on-chip arbitration logic resolves port contention via BUSY flag generation based on chip enable and address match detection - not R/W state - ensuring deterministic write inhibition during simultaneous access to identical addresses.
As a MASTER device, it provides open-drain BUSYL/BUSYR outputs requiring 270 Ω pull-up resistors, supports interrupt mailbox protocol using dedicated SRAM locations (7FEh for INTL, 7FFh for INTR), and enables seamless 16-bit+ bus expansion when paired with IDT71421 SLAVE devices without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 bits (2048 words × 8-bit wide), fully random-access dual-port array |
| Access Time (tAA) | 25 ns max - guarantees deterministic read latency under industrial temp and 5 V ±10% |
| Full Standby Current (ISB3) | 0.2 µA typical - enables ultra-low-power battery backup mode at 2 V VCC |
| Data Retention Voltage | 2.0 V min - retains valid data during main power loss, critical for fail-safe systems |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control and communications hardware |
| Supply Voltage | 4.5 V to 5.5 V - TTL-compatible single-supply operation with no level-shifting required |
| Interrupt Address Mapping | INTL asserted on right-port write to 7FEh; INTR asserted on left-port write to 7FFh - software-accessible mailbox protocol |
Pinout & Package
Package: 52-pin STQFP (PPG52), 10 mm × 10 mm × 1.4 mm body, 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 CE/R/W edge |
| A0R–A10R | Right port address inputs | 11-bit address bus for right-side access; independent timing from left port |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit tri-state I/O; direction controlled by R/WL and OEL |
| I/O0R–I/O7R | Right port bidirectional data | 8-bit tri-state I/O; direction controlled by R/WR and OER |
| CEL / CER | Chip enable (left/right) | Active-low enables respective port; controls power-down entry/exit (ISB1–ISB4) |
| OEL / OER | Output enable (left/right) | Active-low enables data outputs; high-Z when disabled |
| R/WL / R/WR | Read/write control (left/right) | Active-low write; high = read; determines I/O direction and internal write pulse timing |
| INTL / INTR | Interrupt flags (open-drain) | INTL: left-port interrupt output; INTR: right-port interrupt output; require pull-ups |
| BUSYL / BUSYR | BUSY arbitration signals | Open-drain outputs (MASTER only); indicate port contention; require 270 Ω pull-ups |
| VCC / GND | Power and ground | Multiple VCC/GND pins distributed for noise reduction and thermal management |
Key Features
| Feature | Design Value |
|---|---|
| On-chip port arbitration logic | Resolves simultaneous left/right access to same address without external logic or software polling |
| Hardware interrupt mailbox protocol | Uses standard SRAM locations (7FEh/7FFh) for reliable interprocessor signaling with zero-latency flag assertion |
| Master/Slave expandability | Enables 16-bit+ data bus width using one IDT71321LA25JGI MASTER + multiple IDT71421 SLAVES, preserving full speed |
| Battery-backed data retention | Maintains valid SRAM contents at 2 V VCC with ≤100 µA typical ICCDR - supports brown-out recovery |
| Industrial-grade reliability | Qualified across –40°C to +85°C with guaranteed 25 ns access time and robust ESD tolerance (±2 kV HBM) |
Applications
| Real-Time Dual-Processor Communication | Industrial PLC Memory Buffer |
|---|---|
Use Scenario: Two independent microcontrollers exchange status and command data via shared memory without software handshaking. IC Role / Device Role / Timing Role: IDT71321LA25JGI acts as MASTER dual-port SRAM with hardware BUSY arbitration and interrupt flags to coordinate concurrent access. Use Value: Eliminates race conditions and polling overhead; enables deterministic <25 ns inter-processor message latency. |
Use Scenario: A programmable logic controller buffers sensor input and actuator output data between scan cycles. IC Role / Device Role / Timing Role: IDT71321LA25JGI serves as non-blocking I/O buffer memory, allowing simultaneous acquisition and control execution. Use Value: Prevents scan cycle jitter; maintains data integrity during power interruption via 2 V data retention. |
| Avionics Data Concentrator | Medical Imaging Frame Store |
Use Scenario: Multiple sensor modules feed time-critical telemetry into a central flight computer using deterministic shared memory. IC Role / Device Role / Timing Role: IDT71321LA25JGI operates as MASTER in a multi-SLAVE configuration, providing synchronized 2K×8 frame buffering with BUSY-driven arbitration. Use Value: Guarantees atomic writes across redundant sensor channels; meets DO-254 timing constraints for safety-critical avionics. |
Use Scenario: Ultrasound or MRI subsystems store acquired image frames before compression and transmission. IC Role / Device Role / Timing Role: IDT71321LA25JGI functions as low-latency dual-port frame buffer, enabling concurrent acquisition (one port) and processing (other port). Use Value: Sustains >40 MB/s sustained bandwidth with zero wait states; supports real-time display overlay without frame tearing. |
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 CY7C1371DV33-250BZI | 3.3 V core, 250 MHz QDR interface, no native BUSY arbitration or interrupt mailbox | Requires external logic for contention resolution; suited for high-bandwidth cache, not interprocessor comms | Select only if migrating to 3.3 V system with QDR interface needs and external arbitration acceptable |
| IDT71421LA25JGI | SLAVE-only variant; BUSY pins are inputs (not outputs); no on-chip arbitration logic | Must be used with IDT71321LA25JGI MASTER; cannot operate standalone as arbitration node | Choose only as companion SLAVE in width-expanded arrays; never as direct functional replacement |
Compared with IDT71321LA25JGI, CY7C1371DV33-250BZI offers higher bandwidth but lacks integrated arbitration and interrupt logic essential for deterministic interprocessor messaging, while IDT71421LA25JGI serves only as a passive SLAVE and cannot replace the MASTER functionality required for autonomous BUSY generation and mailbox management.
Availability
IDT71321LA25JGI is available at Aetrix Electronics and suitable for industrial PLCs, avionics data concentrators, and medical imaging subsystems requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.
Supply support for IDT71321LA25JGI 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, RF, and power management ICs for communications, computing, and industrial markets.
IDT71321LA25JGI 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 overhead and timing uncertainty.
FAQ
What is the function of BUSYL and BUSYR on IDT71321LA25JGI?
BUSYL and BUSYR are open-drain output signals indicating port contention when both ports attempt simultaneous access to the same memory address. On IDT71321LA25JGI (MASTER), they assert LOW to inhibit writes on the contending port. External 270 Ω pull-up resistors are mandatory per datasheet Note 2. These signals are not present on SLAVE devices like IDT71421LA25JGI.
Does IDT71321LA25JGI support true 25 ns access across its full industrial temperature range?
Yes. IDT71321LA25JGI is specified for 25 ns maximum access time (tAA) over –40°C to +85°C at VCC = 4.5 V to 5.5 V. This is verified in Table 08a under "71321X25 Com'l & Ind" and applies to both read and write-enable timing parameters including tACE and tAOE.
How does the interrupt mailbox mechanism work in IDT71321LA25JGI?
IDT71321LA25JGI uses fixed SRAM addresses for interrupt signaling: writing to 7FEh (hex) from the right port asserts INTL; writing to 7FFh from the left port asserts INTR. Clearing occurs by reading those same addresses with OE and CE active. The data written is user-defined - no special encoding is required, and the locations remain usable as general RAM when interrupts are unused.
Can IDT71321LA25JGI operate with only one port enabled?
Yes. IDT71321LA25JGI supports asymmetric operation: either port may be independently enabled or disabled via its CE pin. When one port is disabled (CE = VIH), it enters standby mode drawing ≤30 µA (ISB2 typ). Full standby (both ports disabled with CMOS-level inputs) draws only 0.2 µA - enabling ultra-low-power battery backup operation.
What package type is used for IDT71321LA25JGI, and are there footprint-compatible alternatives?
IDT71321LA25JGI uses the 52-pin STQFP (PPG52) package, 10 mm × 10 mm × 1.4 mm. While IDT offered the same speed grade in 64-pin TQFP (PNG64), the PPG52 footprint is unique to this variant. No pin-compatible alternatives exist across manufacturers due to proprietary dual-port pinout and BUSY/INT signal placement - migration requires PCB redesign.
71321LA25JGI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 52-LCC (J-Lead)
- 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:
- 25ns
- Access Time:
- 25 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 52-PLCC (19.13x19.13)
71321LA25JGI FAQ
1.How can I place an order for 71321LA25JGI through Aetrix?
Please submit a Request for Quotation (RFQ) for 71321LA25JGI 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 71321LA25JGI reliable?
The price and inventory of 71321LA25JGI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71321LA25JGI is usually 5 days.
3.What payment methods are accepted for 71321LA25JGI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71321LA25JGI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71321LA25JGI?
71321LA25JGI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71321LA25JGI 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 71321LA25JGI?
For technical support, including 71321LA25JGI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71321LA25JGI requirements.
6.How does Aetrix verify that 71321LA25JGI is sourced from the original manufacturer or authorized distributors?
All 71321LA25JGI 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 71321LA25JGI meets industry standards.
7.What is the process for return or replacement of 71321LA25JGI?
All 71321LA25JGI units undergo pre-shipment inspection (PSI). If there is an issue with 71321LA25JGI, 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 71321LA25JGI part is unused and in its original packaging.
Return procedure for 71321LA25JGI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71321LA25JGI 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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