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Renesas 71321SA20PF8
- Part No.:
- 71321SA20PF8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
71321SA20PF8.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,431
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Product details
Overview
IDT71321SA20PF8 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 20 ns max read cycle time, operates on single 5V ±10% supply, supports industrial temperature range (–40°C to +85°C), and features open-drain BUSY/INT outputs requiring 270 Ω pull-up resistors - used in multiprocessing data exchange and shared memory subsystems.
For engineers reviewing the 71321SA20PF8 datasheet, 71321SA20PF8 pinout, 71321SA20PF8 application, or 71321SA20PF8 equivalent, key selection criteria include dual-port asynchronous access timing, MASTER-side arbitration logic, interrupt mailbox addressing (7FEh/7FFh), and compatibility with IDT71421 SLAVE devices in 16-bit+ width expansions.
Technical Context
The 71321SA20PF8 implements fully independent left/right ports with separate address, control, and I/O buses, enabling concurrent read/write operations without internal contention detection on the same port. Its on-chip arbitration logic monitors CE and address signals (A0–A10) to assert BUSYL/BUSYR outputs when address matches occur across ports - no external logic required for write inhibition.
Interrupt functionality uses dedicated mailbox addresses: writing to 7FEh (right port) sets INTL; reading 7FEh (left port) clears it. Similarly, 7FFh controls INTR. Both interrupt flags are open-drain outputs, synchronized to internal timing with tINS ≤ 20 ns and tINR ≤ 20 ns at 20 ns speed grade.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 bits (2048 words × 8 data lines), fully random-access SRAM array |
| Access Time (tRC) | 20 ns max - defines minimum cycle time for consecutive reads/writes on either port |
| Supply Voltage | 4.5 V to 5.5 V - single TTL-compatible 5V rail; all VCC pins must be connected |
| Operating Temperature | –40°C to +85°C - industrial-grade qualification per datasheet Table 2 |
| Standby Current (ISB1) | 30 mA typ. - power consumption when both ports disabled (CE = VIH) at fMAX |
| BUSY Output Type | Open-drain - requires external 270 Ω pull-up resistor per BUSY/INT pin per datasheet Note 2 |
| Interrupt Addresses | 7FEh (sets INTL), 7FFh (sets INTR) - dedicated mailbox locations with user-defined 8-bit payload |
Pinout & Package
71321SA20PF8 is packaged in 52-pin STQFP (PPG52), body size 10 mm × 10 mm × 1.4 mm, with exposed thermal pad (not electrically connected). Pin 1 marked via corner notch; all VCC and GND pins must be connected per datasheet Notes 1–2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A10L | Left port address inputs | 11-bit address bus for left-side memory access (000h–7FFh) |
| A0R–A10R | Right port address inputs | 11-bit address bus for right-side memory access (000h–7FFh) |
| 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; high-impedance when OER = VIH or CER = VIH |
| CEL / CER | Chip enable (left/right) | Active-low enables port access and disables internal circuitry for standby (ISB1–ISB4) |
| OEL / OER | Output enable (left/right) | Active-low enables I/O drivers; high-impedance output when deasserted |
| R/WL / R/WR | Read/write control (left/right) | High = read, low = write; controls direction of I/O bus during active CE |
| INTL / INTR | Interrupt flag outputs | Open-drain outputs; require 270 Ω pull-up; set/cleared via 7FEh/7FFh mailbox writes |
| BUSYL / BUSYR | BUSY arbitration flags | Open-drain outputs on MASTER (71321); indicate address match contention; require 270 Ω pull-up |
| VCC / GND | Power supply | Multiple VCC (pins 18, 27, 40, 47) and GND (pins 21, 33, 45, 52) pins - all must be connected |
Key Features
| Feature | Design Value |
|---|---|
| On-chip port arbitration logic | Hardware-based BUSY assertion using CE + address match (A0–A10), eliminating need for external arbitration gates |
| Dual interrupt mailboxes | Fixed-location 8-bit registers at 7FEh (INTL) and 7FFh (INTR) support deterministic interprocessor signaling |
| Asynchronous dual-port operation | Independent left/right control allows simultaneous read/write to different addresses without synchronization overhead |
| Low-power standby modes | Four ISB modes (ISB1–ISB4) enable granular power gating per port, down to 1.0 mA full standby (ISB3) |
| Master/Slave expandability | 71321SA20PF8 functions as MASTER; pairs with IDT71421 SLAVE to build 16-bit+ word-width systems without speed penalty |
Applications
| Real-Time Multiprocessor Communication | Industrial PLC Shared Memory |
|---|---|
Use Scenario: Two microcontrollers exchange sensor data and control commands via shared memory without software polling or OS intervention. IC Role / Device Role / Timing Role: 71321SA20PF8 acts as MASTER dual-port RAM with hardware BUSY arbitration and interrupt flags to coordinate atomic mailbox updates. Use Value: Eliminates race conditions during concurrent access; 20 ns access enables sub-50 ns inter-processor handshaking latency. |
Use Scenario: A PLC main CPU and motion control co-processor share I/O status, setpoints, and fault logs in deterministic cyclic execution. IC Role / Device Role / Timing Role: 71321SA20PF8 provides isolated, asynchronous read/write paths with industrial temp rating (–40°C to +85°C) and robust BUSY-driven write protection. Use Value: Prevents data corruption during simultaneous access to shared variables; open-drain INT/BUSY supports legacy 5V logic interfaces. |
| Avionics Data Buffering | Test Equipment Pattern Memory |
Use Scenario: Flight computer and health monitoring unit buffer telemetry packets in overlapping time windows with guaranteed atomicity. IC Role / Device Role / Timing Role: 71321SA20PF8 serves as MASTER RAM with interrupt-driven notification (7FEh/7FFh) and address-match BUSY arbitration for safe cross-domain data transfer. Use Value: Meets DO-254 deterministic timing requirements; 20 ns access supports 50 MHz data ingestion rates without FIFO bottlenecks. |
Use Scenario: Automated test equipment stores stimulus/response patterns for high-speed digital IC validation across multiple parallel channels. IC Role / Device Role / Timing Role: 71321SA20PF8 operates as MASTER dual-port RAM enabling simultaneous pattern loading (one port) and result capture (other port) at 50 MHz effective rate. Use Value: Enables zero-wait-state pattern streaming; 2K × 8 capacity supports 2048-cycle test sequences with real-time pass/fail flagging via interrupt mailboxes. |
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, 3.3V supply only; no built-in BUSY arbitration or interrupt mailboxes | Requires external logic for contention management; not drop-in compatible for interrupt-driven designs | Select when wider data bus (16-bit) and lower voltage operation are prioritized over hardware arbitration. |
| IDT71421SA20PF8 | SLAVE-only dual-port SRAM; identical speed/package but lacks on-chip arbitration logic and BUSY outputs | Must be paired with a MASTER (e.g., 71321SA20PF8); cannot operate standalone in arbitration-critical roles | Use only as companion SLAVE in width-expanded systems; never as direct functional replacement for MASTER role. |
Compared with CY7C024AV-20AXC and IDT71421SA20PF8, the 71321SA20PF8 uniquely integrates MASTER arbitration logic and interrupt mailboxes in a 5V, 2K × 8 form factor - essential for deterministic interprocessor communication where external glue logic is prohibited or undesirable.
Availability
71321SA20PF8 is available at Aetrix Electronics and suitable for real-time multiprocessor communication, industrial PLC shared memory, and avionics data buffering requiring stable component supply, long-term lifecycle support, and verified industrial temperature performance.
Supply support for 71321SA20PF8 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 power solutions for communications, computing, and industrial markets.
The IDT71321 product line was engineered for deterministic interprocessor communication in real-time embedded systems, delivering hardware-arbitrated dual-port SRAM with integrated interrupt signaling to eliminate software synchronization overhead.
FAQ
What is the function of BUSYL and BUSYR on the 71321SA20PF8?
BUSYL and BUSYR are open-drain arbitration outputs on the 71321SA20PF8 MASTER device. They assert low when the opposite port accesses the same memory address (A0–A10 match), inhibiting writes on the contending port. Per datasheet Note 1, they require 270 Ω pull-up resistors and are not present on SLAVE devices like IDT71421.
How does interrupt handling work in the 71321SA20PF8?
The 71321SA20PF8 uses fixed mailbox addresses: writing to 7FEh (right port) sets INTL; writing to 7FFh (left port) sets INTR. Clearing occurs by reading those addresses with OE enabled. Both flags are open-drain outputs with tINS ≤ 20 ns and tINR ≤ 20 ns timing - confirmed in datasheet Tables 11a and Truth Table II.
Can the 71321SA20PF8 operate with a 3.3V supply?
No. The 71321SA20PF8 is specified exclusively for 5V ±10% operation (4.5 V to 5.5 V), as stated in "Recommended DC Operating Conditions" (Table 03). It is TTL-compatible and not rated for 3.3V logic levels; using 3.3V violates absolute maximum ratings and will cause functional failure.
What package type is used for the 71321SA20PF8?
The 71321SA20PF8 uses a 52-pin STQFP package designated PPG52, with dimensions 10 mm × 10 mm × 1.4 mm and a corner-notch pin 1 marker. This matches the "PPG52(4)" configuration shown in Figure 03a of the datasheet, distinct from PLCC or 64-pin TQFP variants.
Is battery backup supported on the 71321SA20PF8?
No. Battery backup with 2V data retention is exclusive to LA-suffix variants (e.g., 71321LA20PF8). The 71321SA20PF8 is the standard-power SA version, with standby current ISB3 = 1.0 mA typical at full CMOS-level disable - confirmed in DC Electrical Characteristics Table 04a.
71321SA20PF8 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:
- 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 (14x14)
71321SA20PF8 FAQ
1.How can I place an order for 71321SA20PF8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71321SA20PF8 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 71321SA20PF8 reliable?
The price and inventory of 71321SA20PF8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71321SA20PF8 is usually 5 days.
3.What payment methods are accepted for 71321SA20PF8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71321SA20PF8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71321SA20PF8?
71321SA20PF8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71321SA20PF8 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 71321SA20PF8?
For technical support, including 71321SA20PF8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71321SA20PF8 requirements.
6.How does Aetrix verify that 71321SA20PF8 is sourced from the original manufacturer or authorized distributors?
All 71321SA20PF8 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 71321SA20PF8 meets industry standards.
7.What is the process for return or replacement of 71321SA20PF8?
All 71321SA20PF8 units undergo pre-shipment inspection (PSI). If there is an issue with 71321SA20PF8, 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 71321SA20PF8 part is unused and in its original packaging.
Return procedure for 71321SA20PF8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71321SA20PF8 Tags
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AT24C02C-XHM-T
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