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Renesas 71321SA25PF
- Part No.:
- 71321SA25PF
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
71321SA25PF.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,475
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Product details
Overview
IDT71321SA25PF from Integrated Device Technology is a high-speed 2K × 8 dual-port static RAM with on-chip interrupt and BUSY arbitration logic, designed as a MASTER device for interprocessor communication systems. It delivers 25 ns max access time, operates on single 5V ±10% supply, supports industrial temperature range (–40°C to +85°C), and features open-drain BUSY/INT outputs requiring 270Ω pull-up resistors - used in real-time embedded control and multiprocessing data exchange.
For engineers reviewing the IDT71321SA25PF datasheet, IDT71321SA25PF pinout, IDT71321SA25PF application, or IDT71321SA25PF equivalent, key selection considerations include its MASTER-only arbitration logic, dual-interrupt mailbox addressing (7FEh/7FFh), 52-pin STQFP package, and compatibility with IDT71421 SLAVE devices for 16-bit+ memory expansion without external glue logic.
Technical Context
The IDT71321SA25PF 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 solely 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: writing to 7FEh (right port) sets INTL; writing to 7FFh (left port) sets INTR. Clearing requires read/write access to the same location with OE/CE asserted. BUSY outputs (BUSYL/BUSYR) are open-drain and require external 270Ω pull-ups per datasheet Figure 3.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 bits (2048 words × 8 data lines), providing 16 KB total storage capacity across both ports |
| Access Time (max) | 25 ns - guarantees worst-case read latency under industrial temperature and voltage conditions |
| Supply Voltage | 5.0 V ±10% - TTL-compatible single-supply operation; all VCC pins must be connected |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded systems with no derating required |
| Standby Current (ISB1) | 30 mA (typ.) - power consumption when both ports disabled (CEL = CER = VIH) at fMAX |
| BUSY Output Type | Open-drain - requires external 270Ω pull-up resistor per BUSY pin for proper logic-level assertion |
| Interrupt Mailbox Addresses | 7FEh (sets INTL), 7FFh (sets INTR) - user-defined SRAM locations enabling hardware-synchronized inter-processor messaging |
Pinout & Package
Package: 52-pin STQFP (PPG52), body size 10 mm × 10 mm × 1.4 mm, lead-free and RoHS-compliant per ordering information.
| 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 transitions |
| A0R–A10R | Right port address inputs | 11-bit address bus for right-side memory access; independent of left port timing |
| 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 drivers during arbitration |
| CEL / CER | Chip enable (left/right) | Active-low enables respective port; controls automatic power-down into ISB1/ISB2 modes |
| OEL / OER | Output enable (left/right) | Active-low enables output drivers; high-impedance when deasserted |
| 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) | Asserted low on mailbox write; require 270Ω pull-up per datasheet Figure 3 |
| BUSYL / BUSYR | BUSY arbitration flags (open-drain) | Asserted low when port contention detected; inhibit writes on asserting port |
| VCC / GND | Power supply pins | All VCC pins must be connected to 5V ±10%; all GND pins tied to common ground plane |
Key Features
| Feature | Design Value |
|---|---|
| On-chip port arbitration logic | Resolves simultaneous access to identical addresses using CE/address timing only - eliminates need for external priority encoder or glue logic |
| Dual-interrupt mailbox architecture | Hardware-triggered INTL/INTR flags via dedicated SRAM addresses (7FEh/7FFh), enabling lock-free interprocessor signaling without polling overhead |
| Master-only BUSY generation | BUSYL/BUSYR outputs actively drive low during contention - distinguishes IDT71321SA25PF from SLAVE IDT71421 which accepts BUSY as input |
| Asynchronous dual-port operation | Independent left/right control, address, and I/O buses allow concurrent read/write operations without synchronization clocks or wait states |
| Low-power standby modes | Supports four ISB modes (ISB1–ISB4) down to 1.0 mA full-standby current - optimized for battery-backed or energy-sensitive applications |
Applications
| Industrial PLC Data Exchange | Multiprocessor Real-Time Control |
|---|---|
Use Scenario: Two independent microcontrollers share sensor/actuator status in a programmable logic controller chassis with strict determinism requirements. IC Role / Device Role / Timing Role: IDT71321SA25PF acts as MASTER dual-port RAM, synchronizing data between CPU and I/O processor via BUSY arbitration and interrupt mailboxes. Use Value: Eliminates software semaphores and reduces inter-processor latency to ≤25 ns, meeting IEC 61131-3 cycle-time constraints. |
Use Scenario: A radar signal processor uses separate DSP and ARM cores accessing shared FFT coefficient tables and result buffers. IC Role / Device Role / Timing Role: IDT71321SA25PF provides non-blocking memory access with hardware arbitration, preventing data corruption during concurrent read/write bursts. Use Value: Enables deterministic 25 ns memory access while maintaining full throughput on both ports - no pipeline stalls or retry logic needed. |
| Avionics Health Monitoring System | Medical Imaging Data Buffering |
Use Scenario: Flight control computer and health monitoring unit exchange telemetry and fault logs in DO-254-certified airborne equipment. IC Role / Device Role / Timing Role: IDT71321SA25PF serves as safety-critical shared memory with hardware-enforced write protection via BUSY signals. Use Value: Provides certified, glitch-free arbitration and interrupt-driven event notification - satisfying RTCA/DO-254 Level A design assurance requirements. |
Use Scenario: MRI subsystem transfers raw image frames from acquisition FPGA to reconstruction CPU with zero-copy DMA efficiency. IC Role / Device Role / Timing Role: IDT71321SA25PF operates as MASTER buffer, accepting burst writes from FPGA and servicing sequential reads by CPU without bus contention. Use Value: Sustains 40 MB/s sustained bandwidth (25 ns × 8-bit) with hardware mailbox interrupts triggering frame-ready notifications - reducing host CPU polling load by >95%. |
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 | 3.3V core supply, 15 ns access, QDR interface; no native BUSY arbitration or interrupt mailboxes | Requires external logic for contention resolution; suited for high-speed cache coherency, not interprocessor messaging | Select when migrating to 3.3V systems and adding custom arbitration; not drop-in for IDT71321SA25PF interrupt/BUSY workflows |
| ISSI IS61WV20488BLL | Single-port, 10 ns access, 3.3V operation; no dual-port, no arbitration, no interrupts | Only supports one master controller; cannot replace interprocessor communication function | Consider only for cost-sensitive, non-concurrent-access applications where dual-port capability is unnecessary |
Compared with Cypress CY7C1371DV33 and ISSI IS61WV20488BLL, the IDT71321SA25PF uniquely integrates MASTER arbitration logic and hardware interrupt mailboxes in a 5V industrial-grade package - making it irreplaceable for deterministic, low-latency interprocessor communication without external glue logic.
Availability
IDT71321SA25PF is available at Aetrix Electronics and suitable for industrial PLC data exchange, avionics health monitoring, and medical imaging buffering requiring stable component supply across extended product lifecycles.
Supply support for IDT71321SA25PF 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, specializes in high-performance timing, memory interface, and RF solutions for communications, computing, and industrial markets.
The IDT71321SA25PF belongs to IDT's legacy dual-port SRAM product line, engineered specifically for deterministic interprocessor communication in real-time embedded systems requiring hardware arbitration and interrupt-driven synchronization.
FAQ
What is the function of BUSYL and BUSYR on the IDT71321SA25PF?
BUSYL and BUSYR are open-drain arbitration flags that assert low when port contention is detected on the respective port. As a MASTER device, IDT71321SA25PF generates these signals internally based on CE/address timing - they inhibit writes on the asserting port and require 270Ω external pull-up resistors per datasheet Figure 3.
Can IDT71321SA25PF operate as a SLAVE device in a dual-port configuration?
No. IDT71321SA25PF is exclusively a MASTER device with on-chip arbitration logic and BUSY output capability. For SLAVE functionality, IDT71421SA/LA devices must be used - they accept BUSY as an input and lack internal arbitration circuitry. Mixing IDT71321SA25PF with IDT71421 enables 16-bit+ memory expansion without external logic.
How do the interrupt mailboxes (7FEh and 7FFh) work in IDT71321SA25PF?
Writing to address 7FEh (right port) asserts INTL; writing to 7FFh (left port) asserts INTR. Clearing requires accessing the same address with OE/CE enabled - e.g., reading 7FEh with OEL/CEL active clears INTL. These are standard SRAM locations, so user data can be stored there alongside interrupt signaling.
What power supply requirements does IDT71321SA25PF have?
IDT71321SA25PF requires a single 5.0 V ±10% supply (4.5–5.5 V). All VCC pins must be connected to this supply, and all GND pins tied to a common ground plane. It draws 30 mA typical standby current (ISB1) and 110 mA typical active current (ICC) under industrial conditions.
Is IDT71321SA25PF compatible with 3.3V logic interfaces?
No. IDT71321SA25PF is strictly 5V TTL-compatible: VIH = 2.2 V min, VIL = 0.8 V max. Direct connection to 3.3V controllers requires level-shifting circuitry. Its 5V supply and input thresholds are incompatible with 3.3V-only systems without translation.
71321SA25PF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 64-LQFP
- Packaging:
- Tray
- 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:
- 25ns
- Access Time:
- 25 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 (14x14)
71321SA25PF FAQ
1.How can I place an order for 71321SA25PF through Aetrix?
Please submit a Request for Quotation (RFQ) for 71321SA25PF 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 71321SA25PF reliable?
The price and inventory of 71321SA25PF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71321SA25PF is usually 5 days.
3.What payment methods are accepted for 71321SA25PF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71321SA25PF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71321SA25PF?
71321SA25PF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71321SA25PF 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 71321SA25PF?
For technical support, including 71321SA25PF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71321SA25PF requirements.
6.How does Aetrix verify that 71321SA25PF is sourced from the original manufacturer or authorized distributors?
All 71321SA25PF 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 71321SA25PF meets industry standards.
7.What is the process for return or replacement of 71321SA25PF?
All 71321SA25PF units undergo pre-shipment inspection (PSI). If there is an issue with 71321SA25PF, 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 71321SA25PF part is unused and in its original packaging.
Return procedure for 71321SA25PF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71321SA25PF Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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