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Renesas 71321LA55TFG8
- Part No.:
- 71321LA55TFG8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
71321LA55TFG8.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
IDT71321LA55TFG8 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 delivers 55 ns max read/write cycle time, operates on single 5V ±10% supply, supports industrial temperature range (–40°C to +85°C), and enables battery-backed data retention at 2V - used in dual-CPU arbitration buffers and shared-memory co-processor interfaces.
For engineers reviewing the IDT71321LA55TFG8 datasheet, IDT71321LA55TFG8 pinout, IDT71321LA55TFG8 application, or IDT71321LA55TFG8 equivalent, key selection criteria include dual-port asynchronous access timing, MASTER-mode BUSY output behavior, interrupt mailbox addressing (0x7FE/0x7FF), low-power standby current (1 µA full standby), and 64-pin TQFP package compatibility with legacy IDT dual-port memory layouts.
Technical Context
The IDT71321LA55TFG8 implements fully independent left/right ports with separate address, control, and I/O buses, enabling true concurrent read/write operations without internal arbitration delay. Its on-chip port arbitration logic responds to address and chip-enable timing (not R/W state) to assert open-drain BUSYL/BUSYR outputs - critical for preventing write collisions in master/slave configurations.
Interrupt functionality uses dedicated SRAM addresses (0x7FE for INTL, 0x7FF for INTR) as mailbox registers; assertion occurs on write by opposite port, and clearing requires read-access with OE/CE asserted. The LA suffix confirms low-power design: active current typ. 220 mA at 55 ns, full standby current ≤10 µA at 2V retention voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2K × 8 bits (2048 words × 8-bit wide), providing 2 kB shared memory space accessible from two independent buses |
| Access Time | 55 ns max read cycle time (tRC), defining minimum interval between successive reads on same port |
| Supply Voltage | Single 5.0 V ±10% (4.5–5.5 V), TTL-compatible interface requiring no level-shifting in 5V systems |
| Data Retention | 2.0 V min VCC for data retention (LA-only), enabling backup from coin cell or low-voltage rail without external power switch |
| Standby Current | ≤10 µA at full CMOS standby (ISB3), reducing system power during CPU idle states in battery-operated equipment |
| Operating Temp | –40°C to +85°C industrial grade, qualified for use in motor drives, industrial PLCs, and avionics edge nodes |
| Interrupt Latency | ≤45 ns interrupt set/reset time (tINS/tINR), supporting sub-100 ns inter-processor signaling in hard real-time loops |
Pinout & Package
Package: 64-pin TQFP (PNG64), 14 mm × 14 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 access (0x000–0x7FF); must be stable before CE/WE assertion |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit tri-state I/O; direction controlled by R/WL; high-impedance when OEL = VIH or CEL = VIH |
| CEL, OEL, R/WL | Left port controls | Chip enable, output enable, read/write select - all active-low; CE-driven power-down reduces current to µA range |
| BUSYL, INTL | Left port open-drain flags | BUSYL: arbitration conflict indicator (requires 270 Ω pull-up); INTL: interrupt flag asserted on right-port write to 0x7FE |
| A0R–A10R | Right port address inputs | Independent 11-bit address bus; enables simultaneous access to different memory locations across ports |
| I/O0R–I/O7R | Right port bidirectional data | Electrically isolated from left port I/O; no contention risk when accessing distinct addresses |
| CER, OER, R/WR | Right port controls | Functionally identical to left-side controls but with independent timing domains and arbitration inputs |
| BUSYR, INTR | Right port open-drain flags | BUSYR: conflict output (MASTER mode only); INTR: interrupt flag set by left-port write to 0x7FF |
| VCC, GND | Power pins | Multiple VCC/GND pairs (pins 33, 47, 48, 63, 64 / 17, 32, 45, 46) ensure low-noise operation and reduce ground bounce |
| NC | No-connect | Pins 11, 12, 13, 14, 15, 16, 21, 22, 23, 24, 25, 26, 27, 39, 40, 41, 42, 43, 44, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62 - must remain unconnected |
Key Features
| Feature | Design Value |
|---|---|
| On-chip arbitration logic | Hardware-based BUSY generation using address and CE timing only - eliminates need for external glue logic in multi-processor shared memory |
| Dual interrupt mailboxes | User-configurable 8-bit registers at fixed addresses (0x7FE/0x7FF) enable deterministic inter-processor messaging without software polling overhead |
| Open-drain BUSY outputs | Allows wired-OR connection of multiple MASTER devices in wide-memory arrays - simplifies expansion beyond 16-bit data paths |
| 2V data retention | Preserves memory contents during main power loss using backup battery or supercapacitor, critical for fault logging and state recovery |
| Asynchronous dual-port operation | Independent clockless access on both ports permits integration with heterogeneous processors (e.g., DSP + ARM) without synchronization logic |
Applications
| Industrial PLC Co-Processor Buffer | Avionics Dual-Channel Data Logger |
|---|---|
Use Scenario: Real-time motion controller (PLC CPU) shares status and command buffers with safety monitor processor via shared SRAM. IC Role / Device Role / Timing Role: IDT71321LA55TFG8 acts as MASTER arbitration hub - BUSY signals prevent simultaneous writes to same address, while INTL/INTR flags signal new data availability. Use Value: Eliminates software semaphore overhead and guarantees atomic mailbox updates with ≤45 ns interrupt latency, meeting IEC 61508 SIL-3 timing constraints. | Use Scenario: Flight data recorder captures sensor streams from primary and backup flight computers into synchronized memory segments. IC Role / Device Role / Timing Role: IDT71321LA55TFG8 provides electrically isolated read/write ports - one for each computer - with hardware-enforced write collision avoidance via BUSY arbitration. Use Value: Ensures zero-data-loss recording during dual-channel failover; 2V retention preserves last 30 seconds of telemetry after main power failure. |
| Medical Imaging Frame Buffer | Automotive ADAS Sensor Fusion Hub |
Use Scenario: Ultrasound system uses FPGA-acquired image frames stored in dual-port RAM for real-time display rendering by ARM-based UI processor. IC Role / Device Role / Timing Role: IDT71321LA55TFG8 serves as frame buffer with left port connected to FPGA DMA engine and right port to ARM AHB bus - enabling concurrent capture and display refresh. Use Value: 55 ns access time sustains >180 MB/s throughput required for 4K@60fps video streaming without frame drops or FIFO overflow. | Use Scenario: Radar and camera data streams are time-aligned and fused in real time within an autonomous driving ECU using shared memory architecture. IC Role / Device Role / Timing Role: IDT71321LA55TFG8 functions as low-latency fusion buffer - left port receives radar point clouds, right port supplies fused objects to path-planning core. Use Value: Hardware arbitration ensures deterministic write ordering across sensors; 1 µA standby current extends ECU sleep mode duration by >40% versus standard SRAM. |
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-55AXC | 55 ns access, 2K × 16 organization, 3.3V core with 5V-tolerant I/O, no built-in BUSY arbitration logic | Requires external logic for port collision detection; suited for wider data paths but adds board area and timing complexity | Select when 16-bit data width is mandatory and external arbitration is acceptable |
| Renesas R1EX24002AS0C-55#U0 | 55 ns access, 2K × 8, 3.3V supply only, integrated interrupt but no BUSY flag outputs | Lacks hardware write-inhibit signaling - relies on software coordination or external BUSY gate | Choose for lower-voltage systems where power efficiency outweighs need for hardware arbitration |
Compared with CY7C024AV-55AXC and R1EX24002AS0C-55#U0, the IDT71321LA55TFG8 uniquely integrates both interrupt mailbox addressing and open-drain BUSY arbitration outputs in a 5V-compatible 2K × 8 configuration - delivering plug-and-play dual-processor synchronization without external components or firmware overhead.
Availability
IDT71321LA55TFG8 is available at Aetrix Electronics and suitable for industrial PLCs, avionics data loggers, medical imaging frame buffers, and automotive ADAS sensor fusion hubs requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.
Supply support for IDT71321LA55TFG8 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, specialized in high-performance timing, memory, and interface ICs for communications, computing, and industrial markets.
The IDT71321LA55TFG8 belongs to IDT's dual-port SRAM product line, engineered specifically for deterministic interprocessor communication in real-time embedded systems requiring hardware-enforced memory access arbitration and low-latency interrupt signaling.
FAQ
What is the function of the BUSY pins on the IDT71321LA55TFG8?
The BUSYL and BUSYR pins on the IDT71321LA55TFG8 are open-drain outputs that signal write arbitration conflicts when both ports attempt simultaneous access to the same memory location. When asserted (pulled low), they inhibit writes on the corresponding port - ensuring data integrity without software intervention. Each requires a 270 Ω pull-up resistor per datasheet Figure 3. This hardware arbitration is exclusive to the MASTER IDT71321LA55TFG8 and not present in SLAVE variants.
Does the IDT71321LA55TFG8 support battery backup operation?
Yes, the IDT71321LA55TFG8 supports battery backup operation with guaranteed data retention at VCC = 2.0 V (min), as specified in Table 6. This LA-series feature allows continuous memory preservation during main power loss - critical for black-box logging, configuration storage, and state recovery in industrial and automotive systems. Retention current is ≤1500 µA (commercial) or ≤4000 µA (industrial) at +25°C.
How do the interrupt flags INTL and INTR work on the IDT71321LA55TFG8?
The IDT71321LA55TFG8 uses fixed SRAM addresses 0x7FE and 0x7FF as interrupt mailboxes: writing to 0x7FE (by right port) asserts INTL; writing to 0x7FF (by left port) asserts INTR. Clearing requires reading the same address with OE/CE enabled. These flags operate independently of BUSY status and provide sub-45 ns latency - enabling lock-free interprocessor signaling without polling or shared semaphores in real-time firmware.
Can the IDT71321LA55TFG8 be used as a SLAVE device in a master/slave configuration?
No, the IDT71321LA55TFG8 is exclusively a MASTER device. Only the IDT71421 series functions as SLAVE, accepting BUSY as an input to inhibit writes. The IDT71321LA55TFG8's BUSY pins are outputs only; its arbitration logic is designed to drive external SLAVE devices. Attempting to use it as SLAVE will result in incorrect BUSY behavior and potential data corruption due to missing input-handling circuitry.
What package type is used for the IDT71321LA55TFG8?
The IDT71321LA55TFG8 is packaged in a 64-pin TQFP (Thin Quad Flat Package), designated PNG64 in IDT documentation. Its dimensions are 14 mm × 14 mm × 1.4 mm, with exposed thermal pad (not electrically connected). This RoHS-compliant, lead-free package supports standard reflow profiles and provides robust thermal performance for industrial ambient temperatures up to +85°C.
71321LA55TFG8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 64-LQFP
- 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:
- 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:
- 64-TQFP
71321LA55TFG8 FAQ
1.How can I place an order for 71321LA55TFG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71321LA55TFG8 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 71321LA55TFG8 reliable?
The price and inventory of 71321LA55TFG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71321LA55TFG8 is usually 5 days.
3.What payment methods are accepted for 71321LA55TFG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71321LA55TFG8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71321LA55TFG8?
71321LA55TFG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71321LA55TFG8 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 71321LA55TFG8?
For technical support, including 71321LA55TFG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71321LA55TFG8 requirements.
6.How does Aetrix verify that 71321LA55TFG8 is sourced from the original manufacturer or authorized distributors?
All 71321LA55TFG8 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 71321LA55TFG8 meets industry standards.
7.What is the process for return or replacement of 71321LA55TFG8?
All 71321LA55TFG8 units undergo pre-shipment inspection (PSI). If there is an issue with 71321LA55TFG8, 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 71321LA55TFG8 part is unused and in its original packaging.
Return procedure for 71321LA55TFG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71321LA55TFG8 Tags
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AT21CS01-STUM10-T
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