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Renesas 71321LA20TFG8
- Part No.:
- 71321LA20TFG8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
71321LA20TFG8.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,073
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Product details
Overview
71321LA20TFG8 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. It delivers 20 ns max read cycle time, 2V data retention in battery backup mode, and operates on single 5V ±10% supply across –40°C to +85°C industrial temperature range. It enables error-free 16-bit+ memory expansion when paired with IDT71421 SLAVE devices in embedded control systems.
For engineers reviewing the 71321LA20TFG8 datasheet, 71321LA20TFG8 pinout, 71321LA20TFG8 application, or 71321LA20TFG8 equivalent, key selection criteria include its MASTER arbitration capability, open-drain BUSY/INT outputs requiring 270Ω pull-ups, 1 µA full-standby current (ISB3), and compatibility with TTL-level control signals in real-time dual-CPU architectures.
Technical Context
The 71321LA20TFG8 implements fully asynchronous dual-port access 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 (CEL/CER) and address match timing - not R/W state - ensuring deterministic write inhibition during simultaneous access to identical addresses.
Interrupt functionality uses dedicated mailbox addresses (7FEH for INTL, 7FFH for INTR) with set/reset controlled by port-specific write sequences. The LA variant supports 2V data retention with ≤100 µA ICCDR, enabling nonvolatile operation during main power loss without external backup circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2K × 8 bits (2048 words × 8-bit wide), providing compact dual-access buffer for real-time IPC |
| Access Time | 20 ns max tRC (read cycle), enabling synchronization with 50 MHz bus clocks in master-slave configurations |
| Supply Voltage | 5.0 V ±10%, compatible with standard TTL logic families without level-shifting |
| Data Retention | 2.0 V min VDR, allowing battery backup operation with ultra-low leakage (≤100 µA typical) |
| Standby Current | 1.0 µA ISB3 (full standby, CMOS inputs), critical for low-power industrial sleep modes |
| Operating Temp | –40°C to +85°C industrial grade, qualified for extended deployment in motor drives and PLCs |
| Interrupt Logic | Dedicated mailbox addresses (7FEH/7FFH) with hardware-set/clear flags for lock-free inter-core signaling |
Pinout & Package
71321LA20TFG8 is packaged in a 64-pin STQFP (PPG64), measuring 10 mm × 10 mm × 1.4 mm, with exposed thermal pad and lead-free RoHS-compliant finish.
| 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 CEL assertion |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit TTL-compatible I/O; high-impedance when OEL = VIH or CEL = VIH |
| CEL, OEL, R/WL | Left port controls | Chip enable, output enable, and read/write direction - all active-low for left port |
| INTL, BUSYL | Left port interrupt & BUSY | Open-drain outputs requiring 270Ω pull-up; BUSYL asserts during port contention |
| A0R–A10R | Right port address inputs | Independent 11-bit address bus; arbitration compares these against A0L–A10L |
| I/O0R–I/O7R | Right port bidirectional data | Electrically isolated from left I/O; supports concurrent read/write to different addresses |
| CER, OER, R/WR | Right port controls | Active-low enables matching left port logic; CER/R/WR overlap defines write window |
| INTR, BUSYR | Right port interrupt & BUSY | Open-drain outputs; INTR set by left-port write to 7FFH; BUSYR reflects arbitration result |
| VCC, GND | Power & ground | Multiple VCC/GND pins distributed for noise reduction; all must be connected per datasheet note |
Key Features
| Feature | Design Value |
|---|---|
| MASTER arbitration logic | Hardware-resolved port contention using CE/address timing - no firmware overhead or external logic required |
| 2V data retention | Preserves memory contents during main power failure using coin-cell or supercap backup at ≤100 µA draw |
| Dual interrupt mailboxes | 7FEH and 7FFH provide atomic, hardware-managed signaling between CPUs without shared semaphore code |
| Asynchronous dual-port operation | Independent left/right timing allows simultaneous access to different addresses - no clock domain crossing needed |
| Low-power LA variant | 1 µA full-standby current (ISB3) and 200 µW typical active power enable battery-operated edge nodes |
Applications
| Industrial PLC Communication Module | Automotive ADAS Sensor Fusion Unit |
|---|---|
Use Scenario: Dual-CPU architecture where one processor handles motion control while another manages HMI and diagnostics. IC Role / Device Role / Timing Role: 71321LA20TFG8 acts as MASTER dual-port RAM, synchronizing real-time motion commands and status updates between CPUs via interrupt mailboxes. Use Value: Eliminates software polling with hardware interrupts (INTL/INTR), reduces inter-CPU latency to <25 ns, and ensures deterministic response under 20 ns tINS timing. | Use Scenario: Radar and camera data fusion in autonomous driving ECU, requiring concurrent read/write access to shared feature buffers. IC Role / Device Role / Timing Role: 71321LA20TFG8 provides asynchronous dual-port access to 2KB of fused object data, with BUSY arbitration preventing race conditions during simultaneous writes. Use Value: Enables lock-free data exchange between radar and vision processors, supporting 50 MHz bus timing and eliminating need for external arbitration logic. |
| Medical Imaging Data Buffer | Avionics Flight Control System |
Use Scenario: Real-time acquisition of ultrasound echo data alongside display rendering in portable imaging devices. IC Role / Device Role / Timing Role: 71321LA20TFG8 serves as MASTER buffer, accepting raw ADC samples on one port while feeding processed frames to GPU on the other. Use Value: 20 ns access time sustains 50 MSPS sampling rates; 2V data retention preserves last image frame during emergency power-down. | Use Scenario: Redundant flight control computers exchanging sensor readings and actuator commands in DO-254-certified avionics. IC Role / Device Role / Timing Role: 71321LA20TFG8 operates as MASTER in dual-CPU safety channel, using BUSY arbitration to enforce write ordering and prevent conflicting actuator commands. Use Value: Hardware-enforced contention resolution meets RTCA/DO-254 deterministic timing requirements; industrial temp rating supports wide environmental operating range. |
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 CY7C024AV-20AXC | 2K × 16 organization, 20 ns access, no built-in BUSY arbitration; requires external logic for master/slave expansion | Larger word width but lacks integrated interrupt/mailbox logic and automatic contention handling | Select when 16-bit native interface is required and arbitration can be implemented externally |
| IDT71421LA20TFG8 | SLAVE-only dual-port SRAM; shares same 20 ns speed, 2V retention, and package but has BUSY as input only and no arbitration logic | Designed exclusively for width-expansion with 71321LA20TFG8; cannot operate standalone as MASTER | Use only as companion SLAVE in multi-chip 16-bit+ memory arrays; not a functional substitute |
Compared with CY7C024AV-20AXC and IDT71421LA20TFG8, the 71321LA20TFG8 uniquely integrates MASTER arbitration, dual interrupt mailboxes, and 2V data retention in a single 64-pin STQFP - reducing BOM count, PCB area, and firmware complexity in dual-processor systems.
Availability
71321LA20TFG8 is available at Aetrix Electronics and suitable for industrial PLCs, automotive ADAS ECUs, medical imaging subsystems, and avionics flight controllers requiring stable component supply with long-term lifecycle support.
Supply support for 71321LA20TFG8 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 sensor signal conditioning ICs for communications, computing, and industrial markets.
The IDT71321/71421 family was engineered specifically for deterministic interprocessor communication in real-time embedded systems, delivering hardware-accelerated arbitration and interrupt signaling to replace software-based messaging protocols.
FAQ
What is the function of the BUSY pin on the 71321LA20TFG8?
The BUSY pin (BUSYL or BUSYR) on the 71321LA20TFG8 is an open-drain output that signals port contention when both ports attempt simultaneous access to the same memory address. As a MASTER device, it asserts BUSY to inhibit writes on the contending port - eliminating race conditions without CPU intervention. External 270Ω pull-up resistors are required per datasheet specification.
Does the 71321LA20TFG8 support battery backup operation?
Yes, the 71321LA20TFG8 supports battery backup operation with guaranteed data retention down to 2.0 V (VDR), drawing ≤100 µA typical current (ICCDR) in retention mode. This enables seamless operation during main power loss in applications like medical devices and industrial controllers where volatile memory loss is unacceptable.
How does interrupt handling work in the 71321LA20TFG8?
The 71321LA20TFG8 uses dedicated mailbox addresses: writing to 7FEH sets INTL (left port interrupt), and writing to 7FFH sets INTR (right port interrupt). Clearing is performed by reading those same addresses with appropriate CE/OE asserts. This hardware-managed mechanism eliminates software polling and ensures sub-25 ns interrupt latency (tINS) per datasheet.
Can the 71321LA20TFG8 be used without a companion SLAVE device?
Yes, the 71321LA20TFG8 functions as a complete stand-alone 2K × 8 dual-port SRAM. Its MASTER arbitration logic remains active but only affects internal port behavior - no external SLAVE is required. The SLAVE (IDT71421) is optional and used solely for memory width expansion beyond 8 bits.
What package type is used for the 71321LA20TFG8?
The 71321LA20TFG8 uses a 64-pin STQFP package (PPG64), measuring 10 mm × 10 mm × 1.4 mm with exposed thermal pad. This RoHS-compliant, lead-free package supports automated SMT assembly and provides superior thermal performance versus PLCC alternatives for industrial temperature operation.
71321LA20TFG8 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:
- 20ns
- Access Time:
- 20 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-TQFP (10x10)
71321LA20TFG8 FAQ
1.How can I place an order for 71321LA20TFG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71321LA20TFG8 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 71321LA20TFG8 reliable?
The price and inventory of 71321LA20TFG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71321LA20TFG8 is usually 5 days.
3.What payment methods are accepted for 71321LA20TFG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71321LA20TFG8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71321LA20TFG8?
71321LA20TFG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71321LA20TFG8 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 71321LA20TFG8?
For technical support, including 71321LA20TFG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71321LA20TFG8 requirements.
6.How does Aetrix verify that 71321LA20TFG8 is sourced from the original manufacturer or authorized distributors?
All 71321LA20TFG8 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 71321LA20TFG8 meets industry standards.
7.What is the process for return or replacement of 71321LA20TFG8?
All 71321LA20TFG8 units undergo pre-shipment inspection (PSI). If there is an issue with 71321LA20TFG8, 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 71321LA20TFG8 part is unused and in its original packaging.
Return procedure for 71321LA20TFG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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