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Renesas 71321LA25TFGI8
- Part No.:
- 71321LA25TFGI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
71321LA25TFGI8.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,154
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Product details
Overview
IDT71321LA25TFGI8 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 25 ns max read cycle time, 1 µA full-standby current (CMOS-level inputs), and 2 V battery-backed data retention - enabling reliable operation in industrial control, avionics data buffers, and redundant processor architectures.
For engineers reviewing the IDT71321LA25TFGI8 datasheet, IDT71321LA25TFGI8 pinout, IDT71321LA25TFGI8 application, or IDT71321LA25TFGI8 equivalent, key selection criteria include its MASTER arbitration capability, dual-interrupt flag support (INTL/INTR), open-drain BUSY output requiring 270 Ω pull-up, 52-pin STQFP package, and industrial temperature range (–40°C to +85°C).
Technical Context
The IDT71321LA25TFGI8 implements fully asynchronous dual-port architecture with independent left/right address, control, and I/O buses - permitting simultaneous read/write access to any memory location without internal contention. Its on-chip arbitration logic resolves port conflicts via BUSY assertion based solely on chip enable (CEL/CER) and address match timing, not R/W state.
As a MASTER-only device, it features open-drain BUSYL/BUSYR outputs (requiring external 270 Ω pull-ups), internal interrupt mailbox at addresses 7FEh (left INTL set) and 7FFh (right INTR set), and automatic power-down controlled by CE pins - reducing active current to 110 mA typ. and full-standby current to 0.2 mA typ. at 5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2K × 8 bits (2048 words × 8-bit wide), organized as two independent 11-bit address spaces |
| Access Time | 25 ns max read cycle time (tRC) - guarantees deterministic latency for real-time inter-processor handshaking |
| Supply Voltage | 5.0 V ±10% (4.5–5.5 V) - TTL-compatible single supply, no level-shifting required |
| Standby Current | 0.2 mA typ. (ISB3, CMOS-level inputs) - enables ultra-low-power battery backup mode with 2 V retention |
| Operating Temp | –40°C to +85°C (industrial grade) - qualified for harsh environments including factory automation and aerospace subsystems |
| Data Retention | 2 V minimum VCC for data retention (LA version only) - supports nonvolatile operation during main power loss |
| Interrupt Logic | Dedicated mailbox addresses 7FEh (INTL set/clear) and 7FFh (INTR set/clear) - enables hardware-synchronized message passing |
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; must be stable before CE/OE assertion |
| 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 | 8-bit data path; high-impedance when OEL = VIH or CEL = VIH |
| I/O0R–I/O7R | Right port bidirectional data | 8-bit data path; isolated from left port I/O - no bus contention risk |
| CEL / CER | Chip enable (left/right) | Active-low enables respective port; controls power-down entry/exit (ISB1–ISB4 modes) |
| OEL / OER | Output enable (left/right) | Active-low enables I/O drivers; high-impedance when disabled - essential for bus sharing |
| R/WL / R/WR | Read/write control (left/right) | High = read, low = write; determines direction of I/O data flow per port |
| INTL / INTR | Interrupt flags (open-drain) | Indicate mailbox writes (7FEh/7FFh); require external pull-up; used for hardware event signaling |
| BUSYL / BUSYR | BUSY arbitration signals (open-drain) | Asserted when address/contention detected; require 270 Ω pull-up; inhibit writes on slave devices |
| VCC / GND | Power and ground | All VCC pins must be connected to 5 V ±10%; all GND pins tied to common ground plane |
Key Features
| Feature | Design Value |
|---|---|
| MASTER arbitration logic | On-chip port conflict resolution using CE/address timing - eliminates need for external arbitration logic in multi-processor designs |
| Dual interrupt mailboxes | Hardware-triggered INTL/INTR flags at fixed SRAM addresses (7FEh/7FFh) - enables zero-software-latency inter-core messaging |
| 2 V data retention | Preserves memory contents during main power failure - supports fail-safe logging and state recovery without external battery circuitry |
| Ultra-low standby current | 0.2 mA typ. (ISB3) at 5 V with CMOS-level inputs - reduces system power budget in always-on monitoring applications |
| Industrial temperature rating | Validated operation from –40°C to +85°C - suitable for under-hood automotive ECUs and industrial PLC backplanes |
Applications
| Industrial Redundant Controllers | Aerospace Data Buffers |
|---|---|
|
Use Scenario: Dual-CPU safety-critical controller where primary and backup processors exchange status and commands via shared memory. IC Role / Device Role / Timing Role: MASTER dual-port RAM provides synchronized, contention-free access with hardware BUSY arbitration and interrupt-driven mailbox signaling. Use Value: Eliminates software polling overhead and ensures deterministic response to fault events - meeting DO-254/IEC 61508 timing requirements. |
Use Scenario: Avionics flight data recorder buffering incoming sensor streams from multiple ADC channels. IC Role / Device Role / Timing Role: High-speed 25 ns dual-port interface between acquisition FPGA (right port) and ARM host (left port) with atomic mailbox updates. Use Value: Enables real-time streaming without CPU intervention; 2 V retention preserves last 2K samples during power loss. |
| Medical Imaging Subsystems | Factory Automation Gateways |
|
Use Scenario: MRI scanner subsystem where FPGA-acquired image frames are transferred to DSP for real-time reconstruction. IC Role / Device Role / Timing Role: Dual-port SRAM acts as ping-pong buffer with interrupt flags signaling frame readiness across clock domains. Use Value: Achieves >95% bus utilization with no DMA or software coordination - critical for sub-millisecond image pipeline latency. |
Use Scenario: Programmable logic controller gateway aggregating Modbus RTU data from field devices into Ethernet packets. IC Role / Device Role / Timing Role: MASTER RAM interfaces RS-485 UART (right port) and ARM Cortex-M7 (left port) with hardware handshake via INTL/INTR. Use Value: Reduces firmware complexity by offloading protocol handshaking to dedicated hardware flags - improving determinism and EMC robustness. |
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 CY7C1371DV33-200BZI | 3.3 V supply, 200 MHz QDR interface, no built-in BUSY arbitration or interrupt mailboxes | Requires external logic for port conflict resolution; suited for high-bandwidth streaming, not interprocessor messaging | Select when migrating to 3.3 V systems and prioritizing throughput over hardware handshaking simplicity |
| ISSI IS61WV20488BLL-10MLI | Single-port, 10 ns access, 3.3 V, no dual-port arbitration or interrupt logic | Cannot support true concurrent access; requires software-managed semaphores or external arbitration ICs | Choose only if cost sensitivity outweighs need for hardware-coordinated dual-processor communication |
Compared with CY7C1371DV33-200BZI and IS61WV20488BLL-10MLI, the IDT71321LA25TFGI8 uniquely integrates MASTER arbitration, dual-interrupt mailboxes, and 2 V retention - delivering turnkey interprocessor communication without external components or firmware overhead.
Availability
IDT71321LA25TFGI8 is available at Aetrix Electronics and suitable for industrial redundant controllers, aerospace data buffers, and medical imaging subsystems requiring stable component supply across extended product lifecycles.
Supply support for IDT71321LA25TFGI8 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 high-performance computing and communications.
The IDT71321LA series was engineered specifically for deterministic interprocessor communication in real-time embedded systems - emphasizing hardware arbitration, low-power retention, and industrial reliability over raw bandwidth.
FAQ
What is the function of the BUSY pins on the IDT71321LA25TFGI8?
The BUSYL and BUSYR pins on the IDT71321LA25TFGI8 are open-drain outputs that signal port contention when both ports attempt simultaneous access to the same memory location. They require external 270 Ω pull-up resistors and are used to inhibit writes on SLAVE devices (e.g., IDT71421) in MASTER/SLAVE configurations. The IDT71321LA25TFGI8 implements this arbitration internally based on CE and address timing - no external logic needed.
Does the IDT71321LA25TFGI8 support true simultaneous read/write operations?
Yes - the IDT71321LA25TFGI8 supports fully asynchronous, independent read and write operations on left and right ports. However, if both ports access the same address, the on-chip arbitration logic asserts BUSY to prevent data corruption. Simultaneous reads to the same location are permitted; simultaneous writes trigger BUSY-based priority resolution. This behavior is inherent to the IDT71321LA25TFGI8's MASTER architecture.
How does the interrupt mailbox mechanism work in the IDT71321LA25TFGI8?
The IDT71321LA25TFGI8 uses fixed SRAM addresses 7FEh (hex) and 7FFh (hex) as hardware interrupt mailboxes. Writing to 7FEh via the right port sets the INTL flag; reading 7FEh via the left port clears it. Similarly, writing to 7FFh via the left port sets INTR, and reading 7FFh via the right port clears it. These flags are open-drain and require pull-ups - enabling direct connection to processor interrupt inputs without software polling.
Can the IDT71321LA25TFGI8 operate with only one port enabled?
Yes - the IDT71321LA25TFGI8 supports asymmetric operation. Either port can be independently disabled using its CE pin (CEL or CER). When one port is disabled (CE = VIH), it enters standby mode drawing ≤0.2 mA (ISB3), while the active port retains full 25 ns performance. This allows flexible power management in systems where communication directionality changes dynamically - a core capability of the IDT71321LA25TFGI8 design.
What is the significance of the 'LA' suffix in IDT71321LA25TFGI8?
The 'LA' suffix in IDT71321LA25TFGI8 denotes the low-power, battery-backup variant - distinguishing it from the 'SA' (standard active) version. LA devices guarantee 2 V data retention, achieve 0.2 mA full-standby current (ISB3), and are rated for industrial temperature (–40°C to +85°C). The '25' indicates 25 ns max access time, 'TFGI8' specifies the 52-pin STQFP package with lead-free/RoHS compliance - all confirmed parameters for the IDT71321LA25TFGI8.
71321LA25TFGI8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 64-LQFP
- 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:
- 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:
- 64-TQFP (10x10)
71321LA25TFGI8 FAQ
1.How can I place an order for 71321LA25TFGI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71321LA25TFGI8 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 71321LA25TFGI8 reliable?
The price and inventory of 71321LA25TFGI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71321LA25TFGI8 is usually 5 days.
3.What payment methods are accepted for 71321LA25TFGI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71321LA25TFGI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71321LA25TFGI8?
71321LA25TFGI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71321LA25TFGI8 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 71321LA25TFGI8?
For technical support, including 71321LA25TFGI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71321LA25TFGI8 requirements.
6.How does Aetrix verify that 71321LA25TFGI8 is sourced from the original manufacturer or authorized distributors?
All 71321LA25TFGI8 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 71321LA25TFGI8 meets industry standards.
7.What is the process for return or replacement of 71321LA25TFGI8?
All 71321LA25TFGI8 units undergo pre-shipment inspection (PSI). If there is an issue with 71321LA25TFGI8, 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 71321LA25TFGI8 part is unused and in its original packaging.
Return procedure for 71321LA25TFGI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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